{"title":"OSO","description":"\u003cp style=\"text-align: justify;\"\u003eOSO Hotwater is a leading manufacturer of premium hot water cylinders and water heating solutions, delivering reliable and energy-efficient performance for domestic, commercial, and industrial applications. Designed to meet a wide range of hot water demands, OSO products are trusted in homes, schools, hospitals, factories, and large commercial facilities.\u003c\/p\u003e\n\n\u003cp style=\"text-align: justify;\"\u003eThe range includes indirect unvented cylinders, heat pump cylinders, direct electric water heaters, direct electric cylinders, and compact undersink water heaters. From space-saving mini water heaters to high-capacity commercial heat pump cylinders up to 1000L, OSO systems are built for durability, efficiency, and seamless integration with heat pumps, boilers, and renewable heating systems.\u003c\/p\u003e\n\n\u003cp style=\"text-align: justify;\"\u003eExplore our range of OSO Hotwater cylinders and water heaters for dependable hot water supply, advanced technology, and long-lasting performance.\u003c\/p\u003e","products":[{"product_id":"oso-delta-dc150-150l-indirect-unvented-hot-water-cylinder","title":"OSO Delta DC150 150L Indirect Unvented Hot Water Cylinder","description":"\u003cp\u003eThe \u003cstrong\u003eOSO Delta DC150\u003c\/strong\u003e is a \u003cstrong\u003e150 litre indirect unvented hot water cylinder\u003c\/strong\u003e designed to deliver \u003cstrong\u003ehigh-efficiency mains pressure hot water\u003c\/strong\u003e for modern homes while keeping running costs and heat loss to a minimum.\u003c\/p\u003e\n\u003cp\u003eUsing advanced insulation and an \u003cstrong\u003eA-rated design\u003c\/strong\u003e, this compact cylinder is ideal where \u003cstrong\u003eenergy performance, SAP compliance and space saving\u003c\/strong\u003e are key priorities.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e150 litre indirect unvented hot water cylinder\u003c\/strong\u003e suitable for use with a system or heat-only boiler.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eErP A-rated efficiency\u003c\/strong\u003e to minimise standing heat losses and support lower energy bills.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdvanced insulation with NANOPUR \/ vacuum insulation panel technology\u003c\/strong\u003e for significantly reduced heat loss compared with standard cylinders.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMains pressure performance\u003c\/strong\u003e for powerful showers and fast-filling baths when installed on an appropriate cold mains supply.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-quality stainless steel construction\u003c\/strong\u003e for durability, corrosion resistance and long service life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFactory-supplied unvented control pack\u003c\/strong\u003e including expansion vessel, combination valve, tundish and safety controls for compliant installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDigital thermostat with anti-legionella and holiday modes\u003c\/strong\u003e to optimise performance and hygiene while reducing wasted energy.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact footprint\u003c\/strong\u003e designed to fit a typical UK airing cupboard, helping to maximise usable space.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhy Buy the OSO Delta DC150?\u003c\/h2\u003e\n\u003cp\u003eThe OSO Delta range is recognised as one of the most efficient unvented hot water cylinder series on the market, helping homeowners and housebuilders meet increasingly strict energy and SAP requirements.\u003c\/p\u003e\n\u003cp\u003eChoosing the DC150 model provides \u003cstrong\u003ereliable mains pressure hot water, very low heat losses and long-term running cost savings\u003c\/strong\u003e in a compact, installer-friendly package backed by a long manufacturer warranty on the stainless steel tank.\u003c\/p\u003e\n\u003ch2\u003eSuitable For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmall to medium-sized properties\u003c\/strong\u003e with typical hot water demand for 1 bathroom plus additional outlets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem or regular boiler installations\u003c\/strong\u003e requiring an indirect unvented hot water cylinder.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNew-build and refurbishment projects\u003c\/strong\u003e where SAP performance and ErP A-rated products are specified.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHomes upgrading from older vented or lower-rated cylinders\u003c\/strong\u003e to improve efficiency, reduce heat loss and free up space.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBrand: \u003cstrong\u003eOSO Hotwater\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eRange: \u003cstrong\u003eDelta Coil (Delta DC)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eModel: \u003cstrong\u003eDC150 \/ Delta Coil 150 litre indirect unvented cylinder\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCylinder type: \u003cstrong\u003eIndirect unvented mains pressure hot water cylinder\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eNominal capacity: \u003cstrong\u003e150 litres\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eEnergy efficiency rating: \u003cstrong\u003eA (ErP)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eInsulation: \u003cstrong\u003eHigh-performance foam with vacuum insulation \/ NANOPUR technology\u003c\/strong\u003e for ultra-low standing losses\u003c\/li\u003e\n\u003cli\u003eInstallation orientation: \u003cstrong\u003eFloor-standing\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eHeight: \u003cstrong\u003eApproximately 1000 mm\u003c\/strong\u003e (typical for DC150 model)\u003c\/li\u003e\n\u003cli\u003eDiameter: \u003cstrong\u003eApproximately 595 mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eFinish\/colour: \u003cstrong\u003eWhite outer casing\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003ePrimary heating: \u003cstrong\u003eIndirect coil for connection to boiler or compatible heat source\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eControls supplied: \u003cstrong\u003eUnvented control kit including expansion vessel, combination valve, tundish, motorised valve and safety thermostats (indirect)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eThermostat: \u003cstrong\u003eDigital control with adjustable setpoint, anti-legionella and holiday functions\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eApplication: \u003cstrong\u003eDomestic hot water storage for sealed, unvented systems\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eTank material: \u003cstrong\u003eHigh-grade stainless steel for corrosion resistance and long life\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eGuarantee: \u003cstrong\u003eLong manufacturer warranty on tank\u003c\/strong\u003e (up to 25 years on similar OSO Delta stainless steel vessels – check current warranty terms)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eInstallation \u0026amp; Compliance\u003c\/h2\u003e\n\u003cp\u003eThe OSO Delta DC150 must be installed and commissioned by a suitably qualified G3-certified installer in accordance with UK Building Regulations, the manufacturer’s instructions and local water authority requirements.\u003c\/p\u003e\n\u003cp\u003eThe supplied safety components, expansion vessel and control valves are designed to provide \u003cstrong\u003esafe, reliable unvented operation\u003c\/strong\u003e when correctly installed, ensuring compliance and long-term performance.\u003c\/p\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":62784841613661,"sku":"DC150","price":1370.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OSOHotWaterDeltaIndirectUnventedHotWaterCylinder.webp?v=1764830238"},{"product_id":"oso-delta-dc210-210l-indirect-unvented-hot-water-cylinder","title":"OSO Delta DC210 210L Indirect Unvented Hot Water Cylinder","description":"\u003cdiv style=\"font-family:Arial,sans-serif;font-size:16px;color:#222;max-width:900px;margin:0 auto;line-height:1.6;\"\u003e\n\n  \u003cp\u003eThe \u003cstrong\u003eOSO Delta DC210\u003c\/strong\u003e is a \u003cstrong\u003e210-litre ErP A-rated indirect unvented hot water cylinder\u003c\/strong\u003e — combining industry-leading insulation technology with a fully featured unvented kit to deliver the most energy-efficient boiler-fed cylinder in its class. OSO's \u003cstrong\u003eVacuum Insulation Panels (VIP) and NANOPUR foam\u003c\/strong\u003e reduce standing heat loss to just \u003cstrong\u003e43W\u003c\/strong\u003e, saving approximately 400 kWh per year versus glass-wool products. With a \u003cstrong\u003eprimary heating power of 20.1 kW\u003c\/strong\u003e and heat-up time of approximately \u003cstrong\u003e28 minutes\u003c\/strong\u003e from cold at ΔT 55°C, the DC210 is a high-performance workhorse for 3–4 person households connected to a gas or oil system boiler.\u003c\/p\u003e\n\n  \u003cdiv style=\"display:flex;flex-wrap:wrap;gap:12px;margin:24px 0;\"\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e210L\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eStorage Volume\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003eErP A\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eEnergy Rating\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e43W\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eStanding Heat Loss\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e20.1kW\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003ePrimary Power\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e25 yr\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eTank Warranty\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#e6f4f3;border-left:4px solid #008377CF;border-radius:6px;padding:16px 20px;margin:20px 0;\"\u003e\n    \u003cstrong style=\"color:#005c54;\"\u003eErP A Rated — Best-in-Class Heat Retention\u003c\/strong\u003e\u003cbr\u003e\n    The DC210 holds an \u003cstrong\u003eErP A energy rating\u003c\/strong\u003e — achieved by OSO's Vacuum Insulation Panel technology. With a heat loss of just \u003cstrong\u003e1.03 kWh per day\u003c\/strong\u003e, it retains heat far better than any conventional foam-insulated cylinder of equivalent volume, significantly reducing boiler cycling and energy bills over the cylinder's lifetime.\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px;margin:28px 0 14px;font-size:17px;font-weight:700;\"\u003eKey Features\u003c\/div\u003e\n  \u003cdiv style=\"display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;margin-bottom:28px;\"\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e🌡️ Vacuum Insulation Panels (VIP)\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eOSO's \u003cstrong\u003eaward-winning VIP technology\u003c\/strong\u003e eliminates heat conduction through the insulation layer. At 210L, standing heat loss is just 43W — meaning the cylinder loses approximately \u003cstrong\u003e1.03 kWh per day\u003c\/strong\u003e, compared to 1.8–2.5 kWh\/day for conventional cylinders of the same size.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e🔥 Fast 28-Minute Heat-Up\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe fully flooded 1.1m² coil delivers \u003cstrong\u003e20.1 kW primary heating power\u003c\/strong\u003e, heating the full volume from cold at ΔT 55°C in approximately \u003cstrong\u003e28 minutes\u003c\/strong\u003e — meaning the cylinder recovers quickly after high-demand periods without significant reheating delays.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e⚡ INCOTEC 3kW Backup Immersion\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe \u003cstrong\u003eultra-grade INCOTEC immersion heater\u003c\/strong\u003e provides all-electric backup independent of the boiler primary — compatible with \u003cstrong\u003esolar PV diverters, smart tariff systems, and off-peak Economy 7\/10\u003c\/strong\u003e tariffs for flexible, low-cost heating.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e📊 Smooth Scale-Resistant Coil\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe \u003cstrong\u003esmooth-surfaced heating coil\u003c\/strong\u003e discourages limescale adhesion for long-term heat transfer efficiency — particularly valuable in hard water areas where corrugated coils can accumulate significant scale within a few years of service.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e🔗 Complete G3 Kit Supplied\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eComes with a \u003cstrong\u003efull G3 unvented kit\u003c\/strong\u003e: Honeywell motorised valve, electronic dual cylinder thermostat with LCD, T\u0026amp;P relief valve (10 bar \/ 90–95°C), strainer, PRV, expansion relief, drain cock, tundish, and expansion vessel (12–24L). S and Y plan compatible.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e🔒 25-Year ULTRAWELD Tank\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe \u003cstrong\u003e1.3mm stainless steel inner vessel\u003c\/strong\u003e is fabricated with OSO's ULTRAWELD process for superior weld quality and corrosion resistance — underpinning the \u003cstrong\u003e25-year inner vessel warranty\u003c\/strong\u003e across all UK water types.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e🏖️ Holiday \u0026amp; Anti-Legionella Modes\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe digital LCD thermostat includes \u003cstrong\u003eholiday mode\u003c\/strong\u003e to reduce energy use during extended absences, and \u003cstrong\u003eanti-legionella functionality\u003c\/strong\u003e that automatically runs scheduled pasteurisation cycles — keeping water safe even when the property is unoccupied.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e🏗️ SAP Part L Compliance\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe ErP A rating and low heat loss support \u003cstrong\u003eimproved SAP scores and EPC ratings\u003c\/strong\u003e — directly assisting housebuilders and developers in meeting Part L of the Building Regulations on new and refurbished properties.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#fff5f5;border-left:4px solid #c0392b;border-radius:6px;padding:16px 20px;margin:20px 0;\"\u003e\n    \u003cstrong style=\"color:#c0392b;\"\u003e⚠️ G3 Unvented Installation Required\u003c\/strong\u003e\u003cbr\u003e\n    Must be installed by a \u003cstrong\u003eG3 registered competent engineer\u003c\/strong\u003e. All work must comply with Building Regulation G3 and Water Regulations. \u003cstrong\u003eSolid fuel boilers and non-thermostatically controlled heat sources must not be used\u003c\/strong\u003e with this cylinder.\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px;margin:28px 0 14px;font-size:17px;font-weight:700;\"\u003eTechnical Specifications — DC210\u003c\/div\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;font-size:15px;\"\u003e\n    \u003ctr style=\"background:#005c54;color:#fff;\"\u003e\n      \u003cth style=\"padding:10px 12px;text-align:left;\"\u003eSpecification\u003c\/th\u003e\n      \u003cth style=\"padding:10px 12px;text-align:left;\"\u003eValue\u003c\/th\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eProduct No.\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003eOSO 11009118 (DC 210)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eStorage Volume\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e193 litres (nominal 210L)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eDiameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e595 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eHeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e1,270 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eWeight Empty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e40.7 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eWeight Full\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e239.7 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003ePrimary Coil Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e1.1 m²\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003ePrimary Heating Power\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e20.1 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eHeat-up Time (ΔT 55°C, coil)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e~28.4 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eRecovery Time 70% (ΔT 55°C, coil)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e~19.9 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eImmersion Heater\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e3 kW INCOTEC \/ 1 × 230V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eThermostat Set Point\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e60°C (adjustable 20–70°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eStanding Heat Loss\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e43W \/ 1.03 kWh\/day (EN 12897)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eErP Energy Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003eA\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eCapacity at 40°C\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e308 litres\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eT\u0026amp;P Relief Valve\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e10 bar \/ 90–95°C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eExpansion Vessel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e12–24L supplied\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eSystem Compatibility\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003eS-plan \u0026amp; Y-plan\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eTank Warranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e25 years (stainless steel inner vessel)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\n  \u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px;margin:32px 0 14px;font-size:17px;font-weight:700;\"\u003eFrequently Asked Questions\u003c\/div\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eHow does Vacuum Insulation outperform standard PU foam?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eStandard PU foam insulation conducts heat slowly but continuously. A \u003cstrong\u003eVacuum Insulation Panel\u003c\/strong\u003e removes the air from the insulation layer entirely — eliminating conduction through the medium. The result is thermal resistance 5–10 times higher than foam of the same thickness, which is why VIP cylinders maintain heat far longer between boiler cycles.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eWhat system boiler types is the DC210 compatible with?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eThe DC210 is compatible with all \u003cstrong\u003ethermostatically controlled gas, oil, and electric system boilers\u003c\/strong\u003e. It is not compatible with solid fuel boilers or non-thermostatically controlled heat sources. All major UK gas boiler brands (Worcester Bosch, Vaillant, Baxi, Ideal, Viessmann, etc.) are suitable primary heat sources.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eIs 210L enough hot water for a family?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eThe DC210 is suitable for \u003cstrong\u003e3–4 person households\u003c\/strong\u003e with typical hot water demand. With a 308-litre capacity at 40°C delivery temperature (due to mixing with cold water) and a recovery time of just 20 minutes for 70% recharge, the DC210 handles back-to-back morning showers without issue in most households.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eCan I add a solar PV diverter to the DC210?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eYes. The INCOTEC immersion heater is fully compatible with \u003cstrong\u003esolar PV diverters\u003c\/strong\u003e (e.g. myenergi Eddi, Solic 200, iBoost). The diverter reads your generation and diverts surplus electricity to the immersion — turning excess solar into free hot water and reducing the boiler's workload during summer months.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eDoes the DC210 need annual servicing?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eYes. As an \u003cstrong\u003eunvented cylinder\u003c\/strong\u003e, the DC210 should be serviced annually by a competent engineer as part of G3 compliance. The service includes checking the T\u0026amp;P relief valve, expansion vessel pre-charge pressure, thermostat function, and motorised valve operation — all of which are covered in the OSO service record logbook supplied with the unit.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":62784890274141,"sku":"DC210","price":1590.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OSOHotWaterDeltaIndirectUnventedHotWaterCylinder.webp?v=1764830238"},{"product_id":"oso-delta-dc250-250l-indirect-unvented-hot-water-cylinder","title":"OSO Delta DC250 250L Indirect Unvented Hot Water Cylinder","description":"\u003cdiv style=\"font-family:Arial,sans-serif;font-size:16px;color:#222;max-width:900px;margin:0 auto;line-height:1.6;\"\u003e\n\n  \u003cp\u003eThe \u003cstrong\u003eOSO Delta DC250\u003c\/strong\u003e is a \u003cstrong\u003e250-litre ErP A-rated indirect unvented hot water cylinder\u003c\/strong\u003e — part of OSO's award-winning Delta series, recognised as the most energy-efficient boiler-fed cylinder range available. Featuring \u003cstrong\u003eVacuum Insulation Panels (VIP)\u003c\/strong\u003e and \u003cstrong\u003eNANOPUR foam\u003c\/strong\u003e, the DC250 achieves a standing heat loss of just \u003cstrong\u003e43W\u003c\/strong\u003e, saving approximately \u003cstrong\u003e400 kWh per year\u003c\/strong\u003e versus conventional glass-wool insulated cylinders. Compatible with all gas, oil, and electric boilers, it is supplied complete with a full G3 unvented kit, motorised valve, digital thermostat, and expansion vessel — everything needed for a smooth, fully compliant installation.\u003c\/p\u003e\n\n  \u003cdiv style=\"display:flex;flex-wrap:wrap;gap:12px;margin:24px 0;\"\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e250L\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eStorage Volume\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003eErP A\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eEnergy Rating\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e43W\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eStanding Heat Loss\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e3 kW\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eBackup Immersion\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e25 yr\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eTank Warranty\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#e6f4f3;border-left:4px solid #008377CF;border-radius:6px;padding:16px 20px;margin:20px 0;\"\u003e\n    \u003cstrong style=\"color:#005c54;\"\u003eErP A Rating — Only Full Range from 150–300L\u003c\/strong\u003e\u003cbr\u003e\n    The OSO Delta Coil range is the \u003cstrong\u003eonly full range of ErP A-rated indirect cylinders available from 150–300L\u003c\/strong\u003e. The DC250 holds ErP A at 250 litres — a benchmark that no competitor product matches across the full size range — making it the de facto choice for Part L compliance on boiler-primary installations.\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px;margin:28px 0 14px;font-size:17px;font-weight:700;\"\u003eKey Features\u003c\/div\u003e\n  \u003cdiv style=\"display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;margin-bottom:28px;\"\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e🌡️ VIP + NANOPUR Insulation\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe combination of \u003cstrong\u003eVacuum Insulation Panels and NANOPUR polyurethane foam\u003c\/strong\u003e delivers the lowest standing heat loss of any comparable cylinder — just 43W at 250L. Over a year this saves approximately 400 kWh vs glass-wool insulated alternatives.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e🔥 Fully Flooded Primary Design\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe \u003cstrong\u003efully flooded coil design\u003c\/strong\u003e ensures maximum heat transfer from the boiler primary circuit. The primary heating power is \u003cstrong\u003e20.1 kW\u003c\/strong\u003e at ΔT 55°C, with a heat-up time of under 29 minutes for the full 250L volume.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e⚡ INCOTEC 3kW Backup Immersion\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe \u003cstrong\u003eultra-grade INCOTEC immersion heater\u003c\/strong\u003e sits above the heating coil for electric backup heating — fully compatible with solar PV diverters, smart tariff systems, and off-peak economy tariffs. Adjustable thermostat 20–70°C, preset at 60°C.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e📊 Smooth Limescale-Resistant Coil\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe \u003cstrong\u003esmooth heating coil\u003c\/strong\u003e resists limescale adhesion — maintaining heat transfer efficiency over the long term and reducing the maintenance burden of descaling, particularly important in hard water areas of England.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e🔗 Complete Unvented Kit\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eSupplied with a \u003cstrong\u003efull G3 unvented kit\u003c\/strong\u003e: Honeywell motorised zone valve, electronic dual cylinder thermostat with LCD display, T\u0026amp;P relief valve (10 bar \/ 90–95°C), strainer, PRV, expansion relief, drain cock, tundish, and 12–24L expansion vessel. S and Y plan compatible.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e🔒 ULTRAWELD Stainless Steel\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe inner tank is made from \u003cstrong\u003e1.3mm thick stainless steel\u003c\/strong\u003e fabricated using OSO's ULTRAWELD process — superior weld quality for long-term corrosion resistance. Backed by a class-leading \u003cstrong\u003e25-year tank warranty\u003c\/strong\u003e.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e🏗️ All Boiler Types Compatible\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eWorks with all \u003cstrong\u003ethermostatically controlled gas, oil, and electric boilers\u003c\/strong\u003e. The DC250 is also future-proof — suitable for use alongside heat pumps with gas boiler backup in hybrid systems.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e🏖️ Holiday \u0026amp; Anti-Legionella Modes\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe digital thermostat includes \u003cstrong\u003eholiday mode\u003c\/strong\u003e (reduces heating to conserve energy while away) and \u003cstrong\u003eanti-legionella functionality\u003c\/strong\u003e — automatically running the cylinder to 60°C+ at programmable intervals to maintain safe water temperatures.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#fff5f5;border-left:4px solid #c0392b;border-radius:6px;padding:16px 20px;margin:20px 0;\"\u003e\n    \u003cstrong style=\"color:#c0392b;\"\u003e⚠️ G3 Unvented Installation Required\u003c\/strong\u003e\u003cbr\u003e\n    This is an unvented cylinder. Installation must be carried out by a \u003cstrong\u003eG3 registered competent engineer\u003c\/strong\u003e. All work must comply with Building Regulation G3. Solid fuel boilers and non-thermostatically controlled heat sources must not be connected.\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px;margin:28px 0 14px;font-size:17px;font-weight:700;\"\u003eTechnical Specifications — DC250\u003c\/div\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;font-size:15px;\"\u003e\n    \u003ctr style=\"background:#005c54;color:#fff;\"\u003e\n      \u003cth style=\"padding:10px 12px;text-align:left;\"\u003eSpecification\u003c\/th\u003e\n      \u003cth style=\"padding:10px 12px;text-align:left;\"\u003eValue\u003c\/th\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eProduct No.\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003eOSO 11009119 (DC 250)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eStorage Volume\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e242 litres (nominal 250L)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eDiameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e595 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eHeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e1,530 mm (est.)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003ePrimary Coil Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e~1.3 m²\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eImmersion Heater\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e3 kW INCOTEC \/ 1 × 230V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eThermostat Set Point\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e60°C (adjustable 20–70°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eStanding Heat Loss\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e~43W \/ ~1.03 kWh\/day (EN 12897)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eErP Energy Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003eA\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eT\u0026amp;P Relief Valve\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e10 bar \/ 90–95°C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eExpansion Vessel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e12–24L supplied\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eMotorised Valve\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003eHoneywell V4043H1056C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eSystem Compatibility\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003eS-plan \u0026amp; Y-plan\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eTank Warranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e25 years (stainless steel inner vessel)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\n  \u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px;margin:32px 0 14px;font-size:17px;font-weight:700;\"\u003eFrequently Asked Questions\u003c\/div\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eWhat makes the Delta series different from standard indirect cylinders?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eThe Delta series uses \u003cstrong\u003eVacuum Insulation Panels (VIP)\u003c\/strong\u003e — a technology that achieved an industry award — rather than conventional PU foam. VIPs eliminate heat conduction through the insulation, achieving a standing heat loss at 250L of just 43W vs. 80–100W+ for a conventional foam-insulated cylinder of the same size.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eCan the DC250 be used with a heat pump as well as a boiler?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eThe DC250 can be used as part of a \u003cstrong\u003ehybrid gas-boiler plus heat pump system\u003c\/strong\u003e. However, for \u003cstrong\u003ededicated heat pump installations\u003c\/strong\u003e where heat pump COP is the priority, OSO recommends the \u003cstrong\u003eDelta GeoCoil DGC\u003c\/strong\u003e series — which features a larger heat exchanger (2.6–3.1m²) optimised for low-temperature heat pump primary circuits.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eHow does holiday mode work on the DC250?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eWhen activated, \u003cstrong\u003eholiday mode\u003c\/strong\u003e reduces the cylinder's target temperature to a lower setpoint — saving energy while the property is unoccupied. On return, a single button press restores normal operation. The anti-legionella function ensures the cylinder still periodically heats to a safe temperature even during extended absences.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eIs the INCOTEC immersion suitable for solar PV diversion?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eYes. The INCOTEC immersion heater is fully compatible with \u003cstrong\u003esolar PV diverter devices\u003c\/strong\u003e (such as the myenergi Eddi or Solic 200) that divert surplus solar generation into hot water. This turns the DC250 into an effective solar hot water store — maximising self-consumption and reducing grid energy bills.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eWhat does the 25-year warranty cover?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eThe \u003cstrong\u003e25-year warranty\u003c\/strong\u003e covers the \u003cstrong\u003estainless steel inner vessel\u003c\/strong\u003e against material defects and manufacturing faults from the date of purchase. Factory-fitted electrical elements, thermostats, valves, and expansion vessels carry a \u003cstrong\u003e2-year warranty\u003c\/strong\u003e. The warranty is registered and transferable — consult OSO's warranty documentation for full terms.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":62784892698973,"sku":"DC250","price":1700.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OSOHotWaterDeltaIndirectUnventedHotWaterCylinder.webp?v=1764830238"},{"product_id":"oso-slimline-ri150-150l-indirect-unvented-cylinder","title":"OSO Slimline RI150 150L Indirect Unvented Cylinder","description":"\u003cdiv style=\"font-size:16px; font-family:'Helvetica Neue',Helvetica,Arial,sans-serif; color:#222; max-width:900px; margin:0 auto; line-height:1.6;\"\u003e\n\n  \u003c!-- Intro --\u003e\n  \u003cp style=\"font-size:1.1em; color:#333; margin-bottom:1.4em;\"\u003e\n    The \u003cstrong\u003eOSO Slimline RI150\u003c\/strong\u003e is the \u003cstrong\u003eslimmest domestic unvented cylinder available\u003c\/strong\u003e — just\n    \u003cstrong\u003e430 mm in diameter\u003c\/strong\u003e, yet it delivers \u003cstrong\u003efull mains-pressure hot water\u003c\/strong\u003e for an entire household. \n    Built on over 90 years of Norwegian engineering expertise, this indirect cylinder pairs a \n    \u003cstrong\u003e0.7 m² smooth scale-resistant coil\u003c\/strong\u003e with OSO's proprietary \u003cstrong\u003eNANOPUR foam and Vacuum Insulation Panel (VIP) technology\u003c\/strong\u003e \n    to achieve an exceptionally low standing heat loss of only \u003cstrong\u003e1.8 kWh per 24 hours\u003c\/strong\u003e — \n    saving up to 300 kWh per year compared to conventionally insulated cylinders. Whether you are retrofitting a tight airing cupboard, \n    fitting out a flat or loft conversion, or specifying for a renovation where a standard 595 mm cylinder simply will not go, \n    the Slimline RI150 solves the space problem without compromising on performance or reliability.\n  \u003c\/p\u003e\n\n  \u003c!-- Stat Strip --\u003e\n  \u003cdiv style=\"display:flex; flex-wrap:wrap; gap:10px; margin-bottom:1.6em;\"\u003e\n    \u003cdiv style=\"flex:1; min-width:130px; background:#008377CF; color:#fff; border-radius:6px; padding:14px 10px; text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:1.7em; font-weight:700;\"\u003e430 mm\u003c\/div\u003e\n      \u003cdiv style=\"font-size:0.82em; margin-top:4px;\"\u003eDiameter — slimmest domestic unvented\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1; min-width:130px; background:#008377CF; color:#fff; border-radius:6px; padding:14px 10px; text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:1.7em; font-weight:700;\"\u003e150 L\u003c\/div\u003e\n      \u003cdiv style=\"font-size:0.82em; margin-top:4px;\"\u003eNominal capacity (141 L actual)\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1; min-width:130px; background:#008377CF; color:#fff; border-radius:6px; padding:14px 10px; text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:1.7em; font-weight:700;\"\u003e1.8 kWh\u003c\/div\u003e\n      \u003cdiv style=\"font-size:0.82em; margin-top:4px;\"\u003eStanding heat loss per 24 hrs (EN12897)\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1; min-width:130px; background:#008377CF; color:#fff; border-radius:6px; padding:14px 10px; text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:1.7em; font-weight:700;\"\u003eErP C\u003c\/div\u003e\n      \u003cdiv style=\"font-size:0.82em; margin-top:4px;\"\u003eEnergy efficiency rating\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1; min-width:130px; background:#008377CF; color:#fff; border-radius:6px; padding:14px 10px; text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:1.7em; font-weight:700;\"\u003e5 yr\u003c\/div\u003e\n      \u003cdiv style=\"font-size:0.82em; margin-top:4px;\"\u003eStainless steel tank warranty\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Red installer callout --\u003e\n  \u003cdiv style=\"background:#fff3f3; border-left:4px solid #c0392b; border-radius:4px; padding:13px 16px; margin-bottom:1em;\"\u003e\n    \u003cstrong style=\"color:#c0392b;\"\u003e⚠ Installer Notice — G3 Unvented Qualification Required\u003c\/strong\u003e\u003cbr\u003e\n    Unvented cylinders must be installed by a \u003cstrong\u003ecompetent person holding a valid G3 unvented qualification\u003c\/strong\u003e (e.g. Part P registered, G3 certified). \n    Installation must comply with \u003cstrong\u003eBuilding Regulation G3\u003c\/strong\u003e, the current OSO Installation and Maintenance Manual, and all relevant codes of practice. \n    Failure to comply may invalidate the warranty and breach building regulations.\n  \u003c\/div\u003e\n\n  \u003c!-- Amber compatibility callout --\u003e\n  \u003cdiv style=\"background:#fff8e1; border-left:4px solid #e67e22; border-radius:4px; padding:13px 16px; margin-bottom:1em;\"\u003e\n    \u003cstrong style=\"color:#c0610a;\"\u003e⚠ Compatibility Notice — Pressurised Primary Required\u003c\/strong\u003e\u003cbr\u003e\n    The Slimline RI is \u003cstrong\u003enot suitable for gravity-fed (open-vented) primary systems\u003c\/strong\u003e. It requires a \u003cstrong\u003epressurised primary circuit\u003c\/strong\u003e \n    from a system or regular boiler with a pump. In hard water areas, install a \u003cstrong\u003escale inhibitor or water treatment device\u003c\/strong\u003e on the cold mains supply \n    in line with Building Regulation Part L Domestic Heating Compliance Guide. A minimum cold mains standing pressure of \u003cstrong\u003e2.5 bar\u003c\/strong\u003e and \n    flow rate of \u003cstrong\u003e20 l\/min at 1 bar dynamic pressure\u003c\/strong\u003e is recommended for optimum performance.\n  \u003c\/div\u003e\n\n  \u003c!-- Teal info callout --\u003e\n  \u003cdiv style=\"background:#e6f4f3; border-left:4px solid #008377CF; border-radius:4px; padding:13px 16px; margin-bottom:1.8em;\"\u003e\n    \u003cstrong style=\"color:#005c54;\"\u003eℹ Space-Saving Advantage\u003c\/strong\u003e\u003cbr\u003e\n    At just \u003cstrong\u003e430 mm diameter\u003c\/strong\u003e, the Slimline RI150 is \u003cstrong\u003e165 mm narrower\u003c\/strong\u003e than a standard 595 mm unvented cylinder. \n    It fits in cupboards, alcoves and service voids where no conventional cylinder would go — making it the go-to choice for flats, conversions and \n    compact new-build properties across the UK.\n  \u003c\/div\u003e\n\n  \u003c!-- Feature Grid --\u003e\n  \u003cdiv style=\"display:flex; flex-wrap:wrap; gap:14px; margin-bottom:1.8em;\"\u003e\n\n    \u003cdiv style=\"flex:1; min-width:250px; background:#f8f8f8; border-top:3px solid #008377CF; border-radius:5px; padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700; color:#005c54; margin-bottom:6px;\"\u003e🌞 NANOPUR + VIP Insulation\u003c\/div\u003e\n      \u003cp style=\"margin:0; font-size:0.95em;\"\u003eOSO's \u003cstrong\u003eNANOPUR foam combined with Vacuum Insulation Panels (VIP)\u003c\/strong\u003e achieves insulation performance far surpassing conventional polyurethane foam. The result is a \u003cstrong\u003estanding heat loss of just 76 W \/ 1.8 kWh per 24 hours\u003c\/strong\u003e — delivering genuine energy savings and faster reheat cycles throughout the year.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"flex:1; min-width:250px; background:#f8f8f8; border-top:3px solid #008377CF; border-radius:5px; padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700; color:#005c54; margin-bottom:6px;\"\u003e🔄 Large 0.7 m² Smooth Scale-Resistant Coil\u003c\/div\u003e\n      \u003cp style=\"margin:0; font-size:0.95em;\"\u003eThe \u003cstrong\u003e0.7 m² smooth-bore heat exchanger coil\u003c\/strong\u003e maximises heat transfer from the boiler primary while \u003cstrong\u003eresisting limescale accumulation\u003c\/strong\u003e. At a primary flow rate of 15 l\/min at 80°C, the coil heats the full cylinder in just \u003cstrong\u003e24.3 minutes\u003c\/strong\u003e and achieves a 70% recovery in only \u003cstrong\u003e17 minutes\u003c\/strong\u003e.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"flex:1; min-width:250px; background:#f8f8f8; border-top:3px solid #008377CF; border-radius:5px; padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700; color:#005c54; margin-bottom:6px;\"\u003e⚡ INCOTEC Incoloy Immersion Backup\u003c\/div\u003e\n      \u003cp style=\"margin:0; font-size:0.95em;\"\u003eA \u003cstrong\u003e3 kW Incoloy 825 immersion heater\u003c\/strong\u003e — OSO's own INCOTEC element — provides reliable backup and supplementary heating. The working thermostat is adjustable between \u003cstrong\u003e40–70°C\u003c\/strong\u003e, with an independent safety cut-out at 85°C ±3°C. An upper thermostat controls the primary circuit via the motorised valve.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"flex:1; min-width:250px; background:#f8f8f8; border-top:3px solid #008377CF; border-radius:5px; padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700; color:#005c54; margin-bottom:6px;\"\u003e🔒 Complete G3 Factory Safety Pack\u003c\/div\u003e\n      \u003cp style=\"margin:0; font-size:0.95em;\"\u003eSupplied \u003cstrong\u003efully kitted for G3 compliance\u003c\/strong\u003e: multibloc pressure reducing valve (3 bar) with integral expansion relief valve (6 bar), temperature \u0026amp; pressure relief valve (90–95°C \/ 10 bar), 12-litre expansion vessel with wall bracket, motorised 2-port zone valve, tundish, drain cock and cable clamp — everything needed for a compliant, neat installation.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"flex:1; min-width:250px; background:#f8f8f8; border-top:3px solid #008377CF; border-radius:5px; padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700; color:#005c54; margin-bottom:6px;\"\u003e🏗 EVERLAST Stainless Steel Construction\u003c\/div\u003e\n      \u003cp style=\"margin:0; font-size:0.95em;\"\u003eThe inner vessel is manufactured from \u003cstrong\u003e1.3 mm high-grade stainless steel\u003c\/strong\u003e using OSO's proprietary \u003cstrong\u003eEVERLAST titanium-alloyed composition and ULTRAWELD robotised welding system\u003c\/strong\u003e. This delivers class-leading corrosion resistance without cathodic protection, anodes or annual chemical treatments. KIWA Watertec approved to UK building and water regulations.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"flex:1; min-width:250px; background:#f8f8f8; border-top:3px solid #008377CF; border-radius:5px; padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700; color:#005c54; margin-bottom:6px;\"\u003e📋 S-Plan \u0026amp; Y-Plan Compatible\u003c\/div\u003e\n      \u003cp style=\"margin:0; font-size:0.95em;\"\u003eWorks with \u003cstrong\u003eboth S-plan (2-port zone valve) and Y-plan (mid-position valve) central heating configurations\u003c\/strong\u003e, with factory-supplied wiring diagrams for standard and thermistor-controlled boilers. Internal wiring is \u003cstrong\u003efactory fitted\u003c\/strong\u003e; the installer simply connects the mains supply, motorised valve, and boiler primaries. Compatible with all modern system and regular boilers.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"flex:1; min-width:250px; background:#f8f8f8; border-top:3px solid #008377CF; border-radius:5px; padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700; color:#005c54; margin-bottom:6px;\"\u003e📈 221 Litres Mixed to 40°C\u003c\/div\u003e\n      \u003cp style=\"margin:0; font-size:0.95em;\"\u003eDespite its compact footprint, the RI150 delivers an impressive \u003cstrong\u003e221 litres of usable water mixed to 40°C\u003c\/strong\u003e — enough for multiple simultaneous showers or a full bath with capacity to spare. This blended output figure demonstrates the real-world performance advantage of storing water at higher temperatures with proper pressure control.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"flex:1; min-width:250px; background:#f8f8f8; border-top:3px solid #008377CF; border-radius:5px; padding:16px;\"\u003e\n      \u003cdiv style=\"font-weight:700; color:#005c54; margin-bottom:6px;\"\u003e🏅 ISO-Certified Norwegian Manufacturing\u003c\/div\u003e\n      \u003cp style=\"margin:0; font-size:0.95em;\"\u003eOSO Hotwater has manufactured stainless steel cylinders in Norway since 1932. The company is certified to \u003cstrong\u003eISO 9001 (Quality), ISO 14001 (Environment), ISO 45001 (Occupational Safety)\u003c\/strong\u003e and welding standard \u003cstrong\u003eISO 3834-2\u003c\/strong\u003e, ensuring every cylinder meets exacting quality and sustainability benchmarks before it leaves the factory.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n  \u003c\/div\u003e\n\n  \u003c!-- Technical Specification Table --\u003e\n  \u003cdiv style=\"margin-bottom:1.8em;\"\u003e\n    \u003cdiv style=\"background:#008377CF; color:#fff; padding:10px 16px; border-radius:5px 5px 0 0; font-weight:700; font-size:1.05em;\"\u003e\n      Technical Specifications\n    \u003c\/div\u003e\n    \u003ctable style=\"width:100%; border-collapse:collapse; font-size:0.95em;\"\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; width:45%; font-weight:600;\"\u003eBrand\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003eOSO Hotwater AS\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003eModel \/ Product Code\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003eSlimline RI150 \/ 1326200\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003eType\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003eIndirect unvented mains-pressure hot water cylinder\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003eNominal Capacity\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003e150 litres (141 L actual storage volume)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003eEnergy Efficiency Rating (ErP)\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003eC (EU 812\/2013 \/ 814\/2013)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003eStanding Heat Loss\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003e76 W \/ 1.8 kWh per 24 hours (EN12897:2016)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003eDimensions (Ø × H)\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003e430 mm diameter × 1,610 mm height\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003eWeight (Empty \/ Full)\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003e43 kg \/ 184 kg\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003ePrimary Heating Coil\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003e0.7 m² smooth bore, scale-resistant (HX coil)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003ePrimary Flow Rate\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003e15 l\/min at 80°C\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003eCoil Heat-Up Time (ΔT 55°C)\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003e24.3 minutes (full) \/ 17 minutes (70% recovery)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003eCoil Heating Power\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003e16.5 kW\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003eVolume Mixed to 40°C\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003e221 litres\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003eImmersion Heater\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003e3 kW Incoloy (INCOTEC), 1 × 240 V\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003eThermostat Range\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003e40–70°C working thermostat; 85°C ±3°C safety cut-out\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003eMax Design Pressure\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003e6 bar\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003eOperating Pressure — CW Inlet\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003e3 bar (via PRV)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003eOperating Pressure — Primary Coil\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003e2.5 bar\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003eT\u0026amp;P Relief Valve\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003e90–95°C \/ 10 bar (factory fitted)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003eExpansion Relief Valve\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003e6 bar (integral to multibloc PRV)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003eExpansion Vessel (Supplied)\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003e12 litres with wall mounting bracket (AX 12)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003ePrimary Connections\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003e¾\" BSP flow and return\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003eCold Water Inlet\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003e¾\" BSP (22 mm recommended)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003eHot Water Outlet\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003e¾\" BSP\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003eInner Tank Material\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003e1.3 mm EVERLAST titanium-alloyed stainless steel (ULTRAWELD welding)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003eInsulation Technology\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003eNANOPUR polyurethane foam + Vacuum Insulation Panels (VIP)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003eRegulatory Approval\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003eKIWA Watertec — UK Building \u0026amp; Water Regulations\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003eStandards Compliance\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003eEN 12897:2016, EN 60335-2-21, ISO 3834-2, UKCA marked\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003eManufacturer Certifications\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003eISO 9001 · ISO 14001 · ISO 45001\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003eWiring Plans Included\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003eS-plan and Y-plan (standard and thermistor-controlled boilers)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003eMin. Clearances Required\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003e400 mm front and sides; 150 mm rear; 40 mm above\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3; font-weight:600;\"\u003eWarranty — Tank\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px; border-bottom:1px solid #cde5e3;\"\u003e5 years (stainless steel inner vessel)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#e6f4f3;\"\u003e\n        \u003ctd style=\"padding:9px 14px; font-weight:600;\"\u003eWarranty — Components\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 14px;\"\u003e2 years\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Installation \u0026 Compliance --\u003e\n  \u003cdiv style=\"background:#e6f4f3; border-left:4px solid #008377CF; border-radius:4px; padding:14px 18px; margin-bottom:1.8em;\"\u003e\n    \u003cstrong style=\"color:#005c54; font-size:1.05em;\"\u003eInstallation \u0026amp; Compliance Summary\u003c\/strong\u003e\n    \u003cp style=\"margin:8px 0 0;\"\u003e\n      The Slimline RI150 is \u003cstrong\u003esupplied with all G3 components in a separate accessory kit for site fitting\u003c\/strong\u003e plus P\u0026amp;T valve factory fitted to the vessel.\n      Installation must be carried out by a G3-qualified competent person on an \u003cstrong\u003eS-plan or Y-plan pressurised primary system\u003c\/strong\u003e.\n      A dedicated fused spur with a \u003cstrong\u003edouble-pole isolating switch\u003c\/strong\u003e (minimum 3 mm contact separation) is required for the immersion heater circuit.\n      All cables must comply with BS6141 Table 8 (HOFR 85°C rating). The discharge pipework must be installed with a continuous fall to a safe visible discharge point per Building Regulation G3.\n      Annual maintenance by a competent person — including checking the PRV strainer, expansion relief valve, T\u0026amp;P relief valve, and expansion vessel pre-charge — is a \u003cstrong\u003econdition of the warranty\u003c\/strong\u003e.\n    \u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- FAQ --\u003e\n  \u003cdiv style=\"margin-bottom:1.2em;\"\u003e\n    \u003cdiv style=\"background:#008377CF; color:#fff; padding:10px 16px; border-radius:5px 5px 0 0; font-weight:700; font-size:1.05em;\"\u003e\n      Frequently Asked Questions\n    \u003c\/div\u003e\n\n    \u003cdetails style=\"border:1px solid #cde5e3; border-top:none; padding:12px 16px; margin-bottom:2px;\"\u003e\n      \u003csummary style=\"font-weight:600; cursor:pointer; color:#005c54;\"\u003eWhat makes the Slimline RI150 different from a standard unvented cylinder?\u003c\/summary\u003e\n      \u003cp style=\"margin:10px 0 0;\"\u003e\n        The defining feature is its \u003cstrong\u003e430 mm diameter\u003c\/strong\u003e — the narrowest footprint of any domestic unvented cylinder on the UK market.\n        A standard cylinder is typically 595 mm in diameter, meaning the Slimline is 165 mm slimmer. It fits in locations that would otherwise require an expensive structural alteration or force a compromise to a smaller vented tank.\n        Despite its slim profile, it uses the same \u003cstrong\u003eNANOPUR + VIP insulation technology, EVERLAST stainless steel, and INCOTEC immersion elements\u003c\/strong\u003e as OSO's full-size range — there is no performance penalty for the reduced diameter.\n      \u003c\/p\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails style=\"border:1px solid #cde5e3; border-top:none; padding:12px 16px; margin-bottom:2px;\"\u003e\n      \u003csummary style=\"font-weight:600; cursor:pointer; color:#005c54;\"\u003eIs the Slimline RI150 compatible with a combi boiler?\u003c\/summary\u003e\n      \u003cp style=\"margin:10px 0 0;\"\u003e\n        No. The Slimline RI is an \u003cstrong\u003eindirect unvented cylinder\u003c\/strong\u003e and requires a \u003cstrong\u003esystem boiler or regular (heat-only) boiler\u003c\/strong\u003e to heat water through the primary coil.\n        Combi boilers do not have a separate hot water circuit and cannot drive a cylinder.\n        If you have a combi boiler and need to add stored hot water, you would need to change your boiler to a system or heat-only model as part of the installation project.\n      \u003c\/p\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails style=\"border:1px solid #cde5e3; border-top:none; padding:12px 16px; margin-bottom:2px;\"\u003e\n      \u003csummary style=\"font-weight:600; cursor:pointer; color:#005c54;\"\u003eCan the immersion heater be used as the sole heat source?\u003c\/summary\u003e\n      \u003cp style=\"margin:10px 0 0;\"\u003e\n        The OSO manual specifically cautions against this. The \u003cstrong\u003e3 kW immersion heater is designed for backup and supplementary use only\u003c\/strong\u003e — for example, during boiler servicing, summer periods, or as a boost when solar or heat-pump energy is available.\n        Using the immersion as the sole heat source is possible but results in significantly higher running costs and energy consumption compared to primary coil heating, and OSO advise it should be avoided.\n      \u003c\/p\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails style=\"border:1px solid #cde5e3; border-top:none; padding:12px 16px; margin-bottom:2px;\"\u003e\n      \u003csummary style=\"font-weight:600; cursor:pointer; color:#005c54;\"\u003eDoes the Slimline RI150 require an anode or any corrosion protection?\u003c\/summary\u003e\n      \u003cp style=\"margin:10px 0 0;\"\u003e\n        No. OSO's \u003cstrong\u003eEVERLAST titanium-alloyed stainless steel\u003c\/strong\u003e is \u003cstrong\u003enaturally corrosion-resistant to mains water supply\u003c\/strong\u003e without the need for sacrificial anodes, magnesium rods, or chemical corrosion inhibitors.\n        The manual confirms no specific corrosion maintenance is required. The warranty does not cover use with a private (non-mains) water supply or water chemistries outside OSO's permissible parameters — your local water authority can provide water quality data if required.\n      \u003c\/p\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails style=\"border:1px solid #cde5e3; border-top:none; padding:12px 16px; margin-bottom:2px;\"\u003e\n      \u003csummary style=\"font-weight:600; cursor:pointer; color:#005c54;\"\u003eWhat is the real-world hot water output — will it cope with a busy household?\u003c\/summary\u003e\n      \u003cp style=\"margin:10px 0 0;\"\u003e\n        At storage temperature and mixed to a comfortable \u003cstrong\u003e40°C, the RI150 delivers 221 litres of usable water\u003c\/strong\u003e from a single heated charge — \n        more than enough for two simultaneous showers plus a kitchen load with capacity remaining.\n        With a fast \u003cstrong\u003e17-minute 70% recovery time\u003c\/strong\u003e via the primary coil, hot water is rapidly replenished after high-demand periods.\n        For households of 2–4 people with a system or regular boiler, the RI150 provides reliable mains-pressure performance.\n      \u003c\/p\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails style=\"border:1px solid #cde5e3; border-top:none; padding:12px 16px; margin-bottom:2px;\"\u003e\n      \u003csummary style=\"font-weight:600; cursor:pointer; color:#005c54;\"\u003eWhat annual maintenance does the Slimline RI150 require?\u003c\/summary\u003e\n      \u003cp style=\"margin:10px 0 0;\"\u003e\n        Annual maintenance by a competent person is a \u003cstrong\u003ewarranty condition\u003c\/strong\u003e. The required checks are: inspect and clean the \u003cstrong\u003eline strainer\u003c\/strong\u003e on the PRV;\n        test the \u003cstrong\u003eexpansion relief valve and T\u0026amp;P relief valve\u003c\/strong\u003e to confirm they operate freely; repressurize the \u003cstrong\u003eexpansion vessel\u003c\/strong\u003e air charge to its set level;\n        and visually check the thermostat and immersion heater.\n        The cylinder must also be recommissioned following any maintenance that requires draining. OSO recommend using original OSO spare parts for any replacements.\n      \u003c\/p\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":62784912032093,"sku":"RI150","price":995.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OSOSlimlineRI150150LIndirectUnventedCylinder.jpg?v=1764831627"},{"product_id":"oso-ecoline-150l-indirect-unvented-cylinder-affordable-high-performance-a-rated-hot-water-storage","title":"OSO Ecoline 150L Indirect Unvented Cylinder | Affordable High-Performance A-Rated Hot Water Storage","description":"\u003cdiv class=\"product-description\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eOSO Ecoline 150L indirect unvented cylinder\u003c\/strong\u003e offers exceptional value with \u003cstrong\u003ehigh-grade stainless steel construction\u003c\/strong\u003e and \u003cstrong\u003eadvanced ECO foam insulation\u003c\/strong\u003e for low heat loss and fast recovery times. This \u003cstrong\u003ecost-effective A-rated solution\u003c\/strong\u003e delivers reliable mains pressure hot water perfect for budget-conscious installations.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e150 litre indirect capacity\u003c\/strong\u003e suitable for small to medium households with 1 bathroom.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUltra-low heat loss insulation\u003c\/strong\u003e using latest generation ECO foam for energy efficiency and reduced bills.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFactory-fitted 3 kW immersion heater\u003c\/strong\u003e provides reliable electric backup heating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmooth scale-resistant primary coil (0.8 m²)\u003c\/strong\u003e ensures efficient heat transfer and long life in hard water areas.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete G3 fittings pack\u003c\/strong\u003e including expansion vessel, T\u0026amp;P relief valve, motorised valve and drain cock.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact dimensions: 580 mm diameter x 1600 mm height\u003c\/strong\u003e fits standard airing cupboards.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDigital thermostat with safety cut-out\u003c\/strong\u003e maintains precise temperature control (40-70°C preset 60°C).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightweight duplex stainless steel tank\u003c\/strong\u003e with \u003cstrong\u003e25-year anti-corrosion warranty\u003c\/strong\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhy Buy the OSO Ecoline 150L?\u003c\/h2\u003e\n\u003cp\u003eCombining \u003cstrong\u003eOSO's renowned quality engineering with competitive pricing\u003c\/strong\u003e, the Ecoline series delivers professional performance without premium cost, making it ideal for housebuilders, landlords and homeowners seeking reliable unvented hot water.\u003c\/p\u003e\n\u003cp\u003eWith \u003cstrong\u003esuperior heat-up performance, low standing losses and full factory commissioning\u003c\/strong\u003e, this cylinder minimises installation time while maximising long-term energy savings and system reliability.\u003c\/p\u003e\n\u003ch2\u003eSuitable For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmall family homes and flats\u003c\/strong\u003e (2-3 bedrooms) with moderate hot water demand.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem boilers and regular boilers\u003c\/strong\u003e requiring indirect unvented storage with backup heating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBudget new builds and social housing\u003c\/strong\u003e projects needing compliant, efficient cylinders.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplacement installations\u003c\/strong\u003e upgrading from vented systems or failed cylinders.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBrand: \u003cstrong\u003eOSO Hotwater\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eModel: \u003cstrong\u003eEcoline Indirect 150L\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eType: \u003cstrong\u003eIndirect unvented mains pressure hot water cylinder\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCapacity: \u003cstrong\u003e150 litres\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eEnergy Rating: \u003cstrong\u003eA (ErP)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eStanding Heat Loss: \u003cstrong\u003e1.30 kWh\/24hrs\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eDimensions: \u003cstrong\u003eØ580 mm x 1600 mm height\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eWeight: \u003cstrong\u003e38 kg empty \/ 181 kg full\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003ePrimary Coil: \u003cstrong\u003e0.8 m² smooth scale-resistant\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eHeat-up Time: \u003cstrong\u003e24.3 minutes (coil ΔT 55°C)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eRecovery Time: \u003cstrong\u003e17.2 minutes (70% ΔT 55°C)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eImmersion Heater: \u003cstrong\u003e3 kW factory-fitted (1 x 240V)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMax Operating Pressure: \u003cstrong\u003e6 bar domestic \/ 3 bar primary\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eExpansion Vessel: \u003cstrong\u003e12 litres\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eSafety Valve: \u003cstrong\u003e90-95°C \/ 10 bar T\u0026amp;P relief\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eTank Material: \u003cstrong\u003eDuplex stainless steel (ULTRAWELD)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eWarranty: \u003cstrong\u003e25 years tank \/ 2 years components\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eInstallation \u0026amp; Compliance\u003c\/h2\u003e\n\u003cp\u003eSupplied as a \u003cstrong\u003efully flooded, factory-tested unit\u003c\/strong\u003e with complete G3 kit including motorised valve, multibloc valves, expansion vessel and all pipework fittings for rapid professional installation by qualified engineers.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":62784963739997,"sku":"415076","price":990.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OSOEcolineIndirectUnventedCylinder.jpg?v=1764832484"},{"product_id":"oso-ecoline-210l-indirect-unvented-cylinder","title":"OSO Ecoline 210L Indirect Unvented Cylinder","description":"\u003cdiv class=\"product-description\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eOSO Ecoline 210L\u003c\/strong\u003e indirect unvented cylinder delivers \u003cstrong\u003ecompact, high-quality hot water storage\u003c\/strong\u003e with \u003cstrong\u003eadvanced ECO foam insulation\u003c\/strong\u003e to reduce heat loss and ensure efficient energy use. Designed with a \u003cstrong\u003esmooth dogleg coil\u003c\/strong\u003e for effective heat transfer, the Ecoline 210 provides reliable mains pressure hot water suitable for medium to large homes.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e210 litre capacity\u003c\/strong\u003e with a \u003cstrong\u003ecompact height\u003c\/strong\u003e for easy installation in airing cupboards.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA-rated ErP energy efficiency\u003c\/strong\u003e with low standing heat loss thanks to ECO foam insulation technology.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDogleg smooth coil (approx. 0.8 m²)\u003c\/strong\u003e designed for fast and efficient heat transfer from boilers or heat sources.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFactory fitted 3 kW immersion heater\u003c\/strong\u003e provides electric backup heating as standard.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-grade stainless steel tank\u003c\/strong\u003e offering durability and a \u003cstrong\u003e25-year anti-corrosion warranty\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eG3-compliant unvented controls\u003c\/strong\u003e including motorised valve, expansion vessel, temperature \u0026amp; pressure relief valve, and multibloc set.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact dimensions: 580 mm diameter x 1310 mm height\u003c\/strong\u003e fit most UK airing cupboards and space restricted areas.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhy Buy the OSO Ecoline 210L?\u003c\/h2\u003e\n\u003cp\u003eThe Ecoline 210 combines proven OSO Hotwater engineering with energy-saving insulation to offer \u003cstrong\u003eaffordable, reliable mains pressure hot water\u003c\/strong\u003e tailored for family homes and small blocks. Its compact size reduces installation challenges while maintaining powerful performance.\u003c\/p\u003e\n\u003cp\u003eBacked by a comprehensive warranty and factory-fitted safety controls, the Ecoline 210 provides peace of mind and long-term savings for homeowners and installers.\u003c\/p\u003e\n\u003ch2\u003eSuitable For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMedium to large homes\u003c\/strong\u003e with moderate to high hot water demand.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem boilers and heat pump installations\u003c\/strong\u003e requiring indirect unvented cylinders with electric backup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNew builds, renovations and refurbishments\u003c\/strong\u003e prioritising ErP A-rated products.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallations requiring compact cylinders\u003c\/strong\u003e for space optimisation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBrand: \u003cstrong\u003eOSO Hotwater\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eModel: \u003cstrong\u003eEcoline 210L Indirect Unvented Cylinder\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eType: \u003cstrong\u003eIndirect unvented mains pressure hot water cylinder\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCapacity: \u003cstrong\u003e210 litres\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eEnergy Rating: \u003cstrong\u003eA (ErP)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eStanding Heat Loss: \u003cstrong\u003eApproximately 1.30 kWh\/24hrs via ECO foam insulation\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eDimensions: \u003cstrong\u003eØ580 mm x 1310 mm height\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eWeight: \u003cstrong\u003eApprox. 40 kg empty \/ 210 kg full\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003ePrimary Coil: \u003cstrong\u003eDogleg smooth scale-resistant coil approx. 0.8 m²\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eHeat-up Time (coil ΔT 55°C): \u003cstrong\u003e~24 minutes\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eImmersion Heater: \u003cstrong\u003e3 kW factory-fitted backup\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMax Operating Pressure: \u003cstrong\u003e6 bar\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eExpansion Vessel Capacity: \u003cstrong\u003e12 litres\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eSafety Controls: \u003cstrong\u003eTemperature and pressure relief valves, motorised valve\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eTank Material: \u003cstrong\u003eDuplex stainless steel with 25-year warranty\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eInstallation \u0026amp; Compliance\u003c\/h2\u003e\n\u003cp\u003eSupplied ready with \u003cstrong\u003efull G3 unvented control pack, factory testing and commissioning\u003c\/strong\u003e for straightforward professional installation ensuring compliance with UK Building Regulations.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":62784982450525,"sku":"415078","price":1150.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OSOEcolineIndirectUnventedCylinder.jpg?v=1764832484"},{"product_id":"oso-delta-geocoil-dgc200-200l-heat-pump-cylinder","title":"OSO Delta GeoCoil DGC200 200L Heat Pump Cylinder","description":"\u003cdiv style=\"font-family:Arial,sans-serif;font-size:16px;color:#222;max-width:900px;margin:0 auto;line-height:1.6;\"\u003e\n\n  \u003cp\u003eThe \u003cstrong\u003eOSO Delta GeoCoil DGC200\u003c\/strong\u003e is a \u003cstrong\u003e200-litre ErP A-rated heat pump cylinder\u003c\/strong\u003e built to squeeze every last unit of efficiency from your heat pump installation. The only heat pump cylinder in its class to achieve an \u003cstrong\u003eErP \"A\" rating at 200 litres\u003c\/strong\u003e, it combines OSO's award-winning \u003cstrong\u003eVacuum Insulation Panels\u003c\/strong\u003e with a \u003cstrong\u003e2.6m² tube heat exchanger\u003c\/strong\u003e optimised for low-temperature heat pump operation up to \u003cstrong\u003e15kW\u003c\/strong\u003e. With a standing heat loss of just \u003cstrong\u003e1.08 kWh per day\u003c\/strong\u003e, the DGC200 saves around \u003cstrong\u003e400 kWh annually\u003c\/strong\u003e compared to standard glass-wool insulated cylinders — energy savings that accumulate over the cylinder's 25-year warranted lifespan.\u003c\/p\u003e\n\n  \u003c!-- Stat Strip --\u003e\n  \u003cdiv style=\"display:flex;flex-wrap:wrap;gap:12px;margin:24px 0;\"\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e200L\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eStorage Volume\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003eErP A\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eEnergy Rating\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e15kW\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eMax Heat Pump Input\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e2.6m²\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eHX Surface Area\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e25 yr\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eTank Warranty\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Callout: ErP A unique at 200L --\u003e\n  \u003cdiv style=\"background:#e6f4f3;border-left:4px solid #008377CF;border-radius:6px;padding:16px 20px;margin:20px 0;\"\u003e\n    \u003cstrong style=\"color:#005c54;\"\u003eOnly ErP \"A\" Rated Heat Pump Cylinder at 200L\u003c\/strong\u003e\u003cbr\u003e\n    OSO is one of the only manufacturers to have achieved an \u003cstrong\u003eErP \"A\" rating at 200 litres\u003c\/strong\u003e in a heat pump cylinder. This is critical for housebuilders and developers under Part L pressure, and for homeowners wanting to achieve the highest possible EPC rating alongside a heat pump system.\n  \u003c\/div\u003e\n\n  \u003c!-- Feature Cards --\u003e\n  \u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px;margin:28px 0 14px;font-size:17px;font-weight:700;\"\u003eKey Features\u003c\/div\u003e\n  \u003cdiv style=\"display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;margin-bottom:28px;\"\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e🌡️ VIP Vacuum Insulation Panels\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eOSO's \u003cstrong\u003eaward-winning Vacuum Insulation Panels\u003c\/strong\u003e (H\u0026amp;V News Product of the Year) reduce heat conduction to an absolute minimum. Combined with NANOPUR foam, standing heat loss is just \u003cstrong\u003e49W \/ 1.08 kWh per day\u003c\/strong\u003e — the best in class at this capacity.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e♨️ 2.6m² Tube Heat Exchanger\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe \u003cstrong\u003e2.6m² smooth tube heat exchanger\u003c\/strong\u003e is engineered for heat pump primary circuits, providing excellent heat transfer at low flow temperatures without the performance compromise of a smaller coil — vital for maximising COP.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e⚡ INCOTEC Electric Backup\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eA \u003cstrong\u003e3kW INCOTEC immersion heater\u003c\/strong\u003e at the bottom of the tank provides peak-load backup for the heat pump and enables regular \u003cstrong\u003elegionella pasteurisation\u003c\/strong\u003e at temperatures above 60°C — controlled externally via the building management or heating controller.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e🔒 ULTRAWELD Stainless Steel Tank\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe \u003cstrong\u003e1.3mm thick stainless steel inner vessel\u003c\/strong\u003e is fabricated using OSO's ULTRAWELD process — delivering superior weld quality and long-term corrosion resistance. Backed by a \u003cstrong\u003e25-year tank warranty\u003c\/strong\u003e across all UK water hardness zones.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e🔗 Full G3 Kit Included\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eSupplied with a \u003cstrong\u003ecomplete G3 unvented kit\u003c\/strong\u003e: Honeywell motorised valve, electronic dual cylinder thermostat, T\u0026amp;P relief valve (10 bar \/ 90–95°C), strainer, PRV, expansion relief, drain cock, tundish, and expansion vessel (12–24L). Ready for S or Y plan systems.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e🌡️ Dual Sensor Pockets\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eTwo \u003cstrong\u003e6\/8mm sensor pockets\u003c\/strong\u003e allow precise integration of heat pump temperature probes for controller-managed heating — compatible with sensors from all major heat pump manufacturers including Vaillant, Viessmann, Daikin, Mitsubishi, and Samsung.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e📊 SAP \u0026amp; Part L Support\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe DGC200's \u003cstrong\u003eErP A rating and low heat loss\u003c\/strong\u003e support improved SAP scores and EPC ratings — helping housebuilders demonstrate Part L compliance on new build and deep retrofit projects connected to a heat pump primary source.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e📏 Smooth Limescale-Resistant Coil\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe tube heat exchanger has a \u003cstrong\u003esmooth internal surface\u003c\/strong\u003e that discourages limescale adhesion — essential for maintaining long-term heat transfer efficiency, especially in hard water regions without a water softener.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n  \u003c\/div\u003e\n\n  \u003c!-- Red Installer Callout --\u003e\n  \u003cdiv style=\"background:#fff5f5;border-left:4px solid #c0392b;border-radius:6px;padding:16px 20px;margin:20px 0;\"\u003e\n    \u003cstrong style=\"color:#c0392b;\"\u003e⚠️ G3 Unvented Installation Required\u003c\/strong\u003e\u003cbr\u003e\n    Must be installed by a \u003cstrong\u003eG3 registered competent engineer\u003c\/strong\u003e. All work must comply with Building Regulation G3 and Water Regulations. The immersion heater must be \u003cstrong\u003econtrolled externally\u003c\/strong\u003e — it must not be wired for independent operation without heat pump controller supervision. See the installation manual for full wiring and commissioning instructions.\n  \u003c\/div\u003e\n\n  \u003c!-- Spec Table --\u003e\n  \u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px;margin:28px 0 14px;font-size:17px;font-weight:700;\"\u003eTechnical Specifications\u003c\/div\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;font-size:15px;\"\u003e\n    \u003ctr style=\"background:#005c54;color:#fff;\"\u003e\n      \u003cth style=\"padding:10px 12px;text-align:left;\"\u003eSpecification\u003c\/th\u003e\n      \u003cth style=\"padding:10px 12px;text-align:left;\"\u003eValue\u003c\/th\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eModel \/ Product No.\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003eDGC 200 — OSO 11009121\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eStorage Volume\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e191 litres (nominal 200L)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eDiameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e595 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eHeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e1,270 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eWeight Empty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e43 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eWeight Full\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e237 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eHeat Exchanger Surface Area\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e2.6 m²\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eMax Heat Pump Input\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e15 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eImmersion Heater\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e3 kW INCOTEC \/ 1 × 240V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eThermostat Set Point\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e60°C (adjustable 20–70°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eStanding Heat Loss\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e49W \/ 1.08 kWh per day (EN 12897)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eErP Energy Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003eA\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eT\u0026amp;P Relief Valve\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e10 bar \/ 90–95°C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eSensor Pockets\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e2 × 6\/8mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eExpansion Vessel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e12–24L supplied\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eAppliance Feet\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003eAdjustable 0–40mm, factory fitted\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eTank Warranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e25 years (stainless steel inner vessel)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\n  \u003c!-- FAQ --\u003e\n  \u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px;margin:32px 0 14px;font-size:17px;font-weight:700;\"\u003eFrequently Asked Questions\u003c\/div\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eIs the DGC200 suitable for air source heat pumps as well as ground source?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eYes — despite the \"Geo\" name, the DGC200 is suitable for \u003cstrong\u003eall heat pump types\u003c\/strong\u003e including air source (ASHP), ground source (GSHP), and water source heat pumps. The 2.6m² heat exchanger is designed to work efficiently at the lower primary flow temperatures produced by both ASHP and GSHP systems.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eIs 200L sufficient for a typical family home with a heat pump?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eThe DGC200 is suited to \u003cstrong\u003e3–4 person households\u003c\/strong\u003e with average hot water demand. Because heat pumps heat water more slowly than gas boilers, a slightly larger buffer volume helps avoid morning peak issues. For larger households, consider the \u003cstrong\u003eDGC300\u003c\/strong\u003e. OSO's online water calculator can help size the correct cylinder for your specific usage patterns.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eWhy must the immersion heater be controlled externally?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eIn a heat pump system, the immersion heater must be \u003cstrong\u003emanaged by the heat pump controller or building management system\u003c\/strong\u003e — not simply switched on by an occupant. Unmanaged use of the immersion would circumvent the heat pump entirely, wasting energy. The controller ensures the immersion only operates for legionella cycles or as peak backup when the heat pump is insufficient.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eWhat is ULTRAWELD and why does it matter?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eULTRAWELD is OSO's \u003cstrong\u003eproprietary stainless steel welding technology\u003c\/strong\u003e that creates stronger, smoother welds throughout the inner tank. Smoother welds are less prone to crevice corrosion and limescale adhesion at stress points — the main failure modes in stainless steel cylinders. This is why OSO can offer a genuine \u003cstrong\u003e25-year warranty\u003c\/strong\u003e on the inner vessel.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eDoes the DGC200 qualify for the Boiler Upgrade Scheme (BUS)?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eThe BUS grant applies to the \u003cstrong\u003eheat pump unit\u003c\/strong\u003e, not the cylinder. However, a correctly specified cylinder — such as the DGC200 — is a \u003cstrong\u003erequired component\u003c\/strong\u003e of any BUS-funded heat pump installation. A properly sized, heat-pump-optimised cylinder is often required by the heat pump manufacturer to validate their product warranty and MCS compliance.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":62784994574685,"sku":"DGC200","price":1570.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OsoDeltaGeoCoilDGCHeatPumpCylinder.jpg?v=1764833152"},{"product_id":"oso-delta-geocoil-dgc300-300l-heat-pump-cylinder","title":"OSO Delta GeoCoil DGC300 300L Heat Pump Cylinder","description":"\u003cdiv style=\"font-family:Arial,sans-serif;font-size:16px;color:#222;max-width:900px;margin:0 auto;line-height:1.6;\"\u003e\n\n  \u003cp\u003eThe \u003cstrong\u003eOSO Delta GeoCoil DGC300\u003c\/strong\u003e is a \u003cstrong\u003e300-litre ErP A-rated heat pump cylinder\u003c\/strong\u003e — the most energy-efficient unvented hot water cylinder OSO produces. Featuring their award-winning \u003cstrong\u003eVacuum Insulation Panels (VIP) and NANOPUR insulation\u003c\/strong\u003e, it saves approximately \u003cstrong\u003e400 kWh per year\u003c\/strong\u003e in heat loss compared to glass-wool insulated products — enough energy savings over its lifetime to offset the entire cost of the cylinder. Designed around a massive \u003cstrong\u003e3.1m² tube heat exchanger\u003c\/strong\u003e, the DGC300 extracts heat from pumps up to \u003cstrong\u003e18kW\u003c\/strong\u003e with exceptional efficiency, while the INCOTEC immersion heater provides electric backup and legionella protection at all times.\u003c\/p\u003e\n\n  \u003c!-- Stat Strip --\u003e\n  \u003cdiv style=\"display:flex;flex-wrap:wrap;gap:12px;margin:24px 0;\"\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e300L\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eStorage Volume\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003eErP A\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eEnergy Rating\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e18kW\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eMax Heat Pump Input\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e3.1m²\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eHX Surface Area\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e25 yr\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eTank Warranty\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Callout: ErP A --\u003e\n  \u003cdiv style=\"background:#e6f4f3;border-left:4px solid #008377CF;border-radius:6px;padding:16px 20px;margin:20px 0;\"\u003e\n    \u003cstrong style=\"color:#005c54;\"\u003eOnly ErP \"A\" Rated Heat Pump Cylinder at 300L\u003c\/strong\u003e\u003cbr\u003e\n    The OSO Delta GeoCoil DGC300 is among a very select group of cylinders to achieve an \u003cstrong\u003eErP \"A\" energy rating at 300 litres\u003c\/strong\u003e. This is made possible by the combination of Vacuum Insulation Panels and NANOPUR foam — reducing standing heat loss to just \u003cstrong\u003e1.18 kWh per day\u003c\/strong\u003e. The result: lower running costs and improved SAP\/EPC scores.\n  \u003c\/div\u003e\n\n  \u003c!-- Feature Cards --\u003e\n  \u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px;margin:28px 0 14px;font-size:17px;font-weight:700;\"\u003eKey Features\u003c\/div\u003e\n  \u003cdiv style=\"display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;margin-bottom:28px;\"\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e🌡️ VIP Vacuum Insulation Panels\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eOSO's unique \u003cstrong\u003eVacuum Insulation Panels (VIP)\u003c\/strong\u003e — an innovation that won the H\u0026amp;V News Product of the Year award — eliminate heat conduction through the insulation layer, achieving a standing heat loss of just \u003cstrong\u003e49W\u003c\/strong\u003e. This saves approximately 400 kWh per year vs glass-wool alternatives.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e♨️ 3.1m² Tube Heat Exchanger\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe \u003cstrong\u003elarge-surface tube heat exchanger (3.1m²)\u003c\/strong\u003e is specifically designed for heat pump operation, extracting heat efficiently from refrigerant at low primary temperatures — essential for maximising heat pump COP and overall system performance.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e⚡ INCOTEC Immersion Backup\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eAn \u003cstrong\u003eultra-grade INCOTEC 3kW immersion heater\u003c\/strong\u003e sits above the heating coil, providing electric backup when the heat pump cannot meet demand. It also enables \u003cstrong\u003eregular legionella pasteurisation cycles\u003c\/strong\u003e at temperatures above 60°C, as required by health regulations.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e🔒 ULTRAWELD Stainless Construction\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe inner tank is fabricated using OSO's \u003cstrong\u003eULTRAWELD welding process\u003c\/strong\u003e, delivering superior corrosion resistance in all UK water hardness zones. Combined with the 1.3mm thick stainless steel construction, this underpins the \u003cstrong\u003e25-year tank warranty\u003c\/strong\u003e.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e🔗 S \u0026amp; Y Plan Compatible\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eShips with a \u003cstrong\u003eHoneywell motorised valve\u003c\/strong\u003e, electronic dual cylinder thermostat, T\u0026amp;P relief valve (10 bar \/ 90–95°C), full G3 kit, adjustable expansion vessel (12–24L), and factory-fitted adjustable feet. Compatible with both \u003cstrong\u003eS-plan and Y-plan\u003c\/strong\u003e systems.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e📊 Smooth Scale-Resistant Coil\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe \u003cstrong\u003esmooth-surface tube heat exchanger\u003c\/strong\u003e resists limescale adhesion, maintaining heat transfer efficiency over the long term without the maintenance burden of a corrugated coil — particularly important in hard water areas.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e🏗️ SAP Compliance Support\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe DGC300's \u003cstrong\u003eErP A rating and low heat loss figures\u003c\/strong\u003e are specifically valued by housebuilders and developers aiming to meet Part L and SAP energy requirements. The cylinder is cited in OSO's SAP support documentation.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e🌡️ Dual Sensor Pockets\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eFitted with \u003cstrong\u003etwo sensor pockets (6\/8mm)\u003c\/strong\u003e for heat pump controller temperature probes, plus an adjustable digital thermostat (20–70°C, preset 60°C) — enabling precise integration with heat pump control systems from all major manufacturers.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n  \u003c\/div\u003e\n\n  \u003c!-- Red Installer Callout --\u003e\n  \u003cdiv style=\"background:#fff5f5;border-left:4px solid #c0392b;border-radius:6px;padding:16px 20px;margin:20px 0;\"\u003e\n    \u003cstrong style=\"color:#c0392b;\"\u003e⚠️ G3 Unvented Installation Required\u003c\/strong\u003e\u003cbr\u003e\n    This is an \u003cstrong\u003eunvented hot water cylinder\u003c\/strong\u003e. Installation must be carried out by a \u003cstrong\u003eG3 registered engineer\u003c\/strong\u003e (e.g. registered with CIPHE, APHC, or an equivalent Competent Persons Scheme). All work must comply with Building Regulation G3. The immersion heater must be controlled externally — consult the installation manual for wiring details.\n  \u003c\/div\u003e\n\n  \u003c!-- Spec Table --\u003e\n  \u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px;margin:28px 0 14px;font-size:17px;font-weight:700;\"\u003eTechnical Specifications\u003c\/div\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;font-size:15px;\"\u003e\n    \u003ctr style=\"background:#005c54;color:#fff;\"\u003e\n      \u003cth style=\"padding:10px 12px;text-align:left;\"\u003eSpecification\u003c\/th\u003e\n      \u003cth style=\"padding:10px 12px;text-align:left;\"\u003eValue\u003c\/th\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eModel \/ Product No.\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003eDGC 300 — OSO 11009123\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eStorage Volume\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e279 litres (nominal 300L)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eDiameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e595 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eHeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e1,750 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eWeight Empty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e63 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eWeight Full\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e340 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eHeat Exchanger Surface Area\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e3.1 m²\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eMax Heat Pump Input\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e18 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eImmersion Heater\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e3 kW INCOTEC \/ 1 × 240V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eThermostat Set Point\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e60°C (adjustable 20–70°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eStanding Heat Loss\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e49W \/ 1.18 kWh per day (EN 12897)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eErP Energy Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003eA\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eT\u0026amp;P Relief Valve\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e10 bar \/ 90–95°C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eSensor Pockets\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e2 × 6\/8mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eExpansion Vessel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e12–24L supplied\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eAppliance Feet\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003eAdjustable 0–40mm, factory fitted\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eTank Warranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e25 years (stainless steel inner vessel)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\n  \u003c!-- FAQ --\u003e\n  \u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px;margin:32px 0 14px;font-size:17px;font-weight:700;\"\u003eFrequently Asked Questions\u003c\/div\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eWhy is a large heat exchanger so important for heat pump cylinders?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eHeat pumps operate most efficiently at \u003cstrong\u003elower primary flow temperatures\u003c\/strong\u003e (e.g. 45–55°C). A large heat exchanger surface area — like the DGC300's 3.1m² — maximises heat transfer at these lower temperatures, reducing the need for the heat pump to reach higher temperatures. This directly improves the system COP and reduces running costs.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eCan the DGC300 also be used with a gas or oil boiler?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eYes. While optimised for heat pumps, the DGC300 is fully compatible with \u003cstrong\u003egas and oil boilers\u003c\/strong\u003e connected via the primary coil — including as a future-proof option during a phased transition from gas. The INCOTEC immersion also provides all-electric backup independently.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eHow does the DGC300 achieve an ErP A rating at 300 litres?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eThe ErP A rating results from the combination of \u003cstrong\u003eVacuum Insulation Panels (VIP)\u003c\/strong\u003e and \u003cstrong\u003eNANOPUR polyurethane foam\u003c\/strong\u003e. VIPs eliminate heat conduction through the insulation, achieving thermal resistance far beyond conventional foam alone. At 300L, the DGC300 stands out as one of very few cylinders to achieve the A rating in this size class.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eWhat does INCOTEC mean and why does it matter in hard water?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eINCOTEC is OSO's proprietary immersion heater technology with \u003cstrong\u003eenhanced anti-limescale properties\u003c\/strong\u003e and superior durability in hard and chlorinated water conditions. Compared to standard titanium or copper elements, INCOTEC heaters are designed for a significantly longer service life — reducing replacement costs over the cylinder's lifetime.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eDoes the DGC300 include a full G3 unvented kit?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eYes. The cylinder ships with a \u003cstrong\u003ecomplete G3 unvented kit\u003c\/strong\u003e including: strainer, pressure reducing valve (PRV), expansion relief valve, drain cock, and tundish. The motorised Honeywell zone valve and expansion vessel (12–24L) are also included — minimising additional parts procurement for the installer.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":62785006960989,"sku":"DGC300","price":1730.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OsoDeltaGeoCoilDGCHeatPumpCylinder.jpg?v=1764833152"},{"product_id":"oso-maxi-geocoil-mgc400-400l-heat-pump-cylinder-high-capacity-15kw-3-phase-unvented-hot-water-storage","title":"OSO Maxi GeoCoil MGC400 400L Heat Pump Cylinder | High Capacity 15kW 3-Phase Unvented Hot Water Storage","description":"\u003cdiv class=\"product-description\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eOSO Maxi GeoCoil MGC400\u003c\/strong\u003e is a \u003cstrong\u003e400 litre unvented heat pump cylinder\u003c\/strong\u003e optimised for maximum hot water production from heat pumps up to 25 kW (with larger models up to 40 kW). Featuring \u003cstrong\u003e3.1 m² large smooth scale-resistant titanium alloy coil\u003c\/strong\u003e and superior \u003cstrong\u003evacuum insulation panel (VIP) and NANOPUR foam insulation\u003c\/strong\u003e, it delivers ultra-efficient, rapid recovery and low heat loss.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e400 litre capacity\u003c\/strong\u003e provides high-volume hot water storage for large homes and commercial properties.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh heat pump compatibility\u003c\/strong\u003e up to 25 kW ensures maximum efficiency and flexible system integration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdvanced insulation technology\u003c\/strong\u003e combining VIP and NANOPUR foam for minimal standing heat loss, saving up to 650 kWh\/year.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3.1 m² smooth scale-resistant primary coil\u003c\/strong\u003e designed for rapid heat transfer and durability in hard water areas.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3-phase 15 kW electric immersion heater option\u003c\/strong\u003e for high power backup and quick recovery times.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable thermostat (60-90°C)\u003c\/strong\u003e with anti-legionella and holiday modes for optimal hygiene and energy savings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact diameter 595 mm but tall 2170 mm height\u003c\/strong\u003e designed to fit standard airing cupboards while maximising capacity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFactory-fitted comprehensive unvented control pack\u003c\/strong\u003e including expansion vessel, safety valves, motorised valve and temperature controls.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhy Buy the OSO Maxi GeoCoil MGC400?\u003c\/h2\u003e\n\u003cp\u003eThis cylinder is built for \u003cstrong\u003emaximum hot water production and energy efficiency\u003c\/strong\u003e, ideal for large residential buildings or commercial applications requiring high capacity and rapid recovery combined with compliance to the strictest building and energy regulations.\u003c\/p\u003e\n\u003cp\u003eThe use of \u003cstrong\u003ehigh-grade materials and advanced insulation\u003c\/strong\u003e ensures long service life and significantly reduced operating costs.\u003c\/p\u003e\n\u003ch2\u003eSuitable For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLarge homes and light commercial properties\u003c\/strong\u003e with high hot water requirements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat pump systems up to 25 kW\u003c\/strong\u003e needing large capacity indirect unvented cylinders.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNew build and retrofit projects\u003c\/strong\u003e requiring future-proofed, high-efficiency hot water solutions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallations needing 3-phase electric immersion backup\u003c\/strong\u003e for rapid hot water availability.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBrand: \u003cstrong\u003eOSO Hotwater\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eModel: \u003cstrong\u003eMaxi GeoCoil MGC400 (Product code: 11008988)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eType: \u003cstrong\u003eIndirect unvented heat pump cylinder\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCapacity: \u003cstrong\u003e400 litres\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eHeat Pump Compatibility: \u003cstrong\u003eUp to 25 kW\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eEnergy Rating: \u003cstrong\u003eA (ErP)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003ePrimary Coil Size: \u003cstrong\u003e3.1 m² smooth scale-resistant titanium alloy\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eDimensions: \u003cstrong\u003eDiameter 595 mm x Height 2170 mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eWeight: \u003cstrong\u003eApprox. 101 kg empty\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eImmersion Heater: \u003cstrong\u003e15 kW 3-phase (optional)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eStanding Heat Loss: \u003cstrong\u003eLow heat loss from VIP + foam insulation\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eThermostat: \u003cstrong\u003eAdjustable 60-90°C with anti-legionella \u0026amp; holiday modes\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eExpansion Vessel: \u003cstrong\u003eIncluded in control pack\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eWarranty: \u003cstrong\u003e25 years tank \/ 2 years components\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eInstallation \u0026amp; Compliance\u003c\/h2\u003e\n\u003cp\u003eSupplied complete with a \u003cstrong\u003efull G3-compliant unvented control pack\u003c\/strong\u003e to ensure safe, efficient installation by qualified professionals, including all safety valves, expansion vessel, and controls for professional heat pump integration.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":62785019806045,"sku":"MGC400","price":4900.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OsoHotwaterMaxiGeoCoilMGCcommercialcylinderheatpump.jpg?v=1764833721"},{"product_id":"oso-maxi-geocoil-mgc1000-1000l-commercial-heat-pump-cylinder-15kw-3-phase-high-capacity-unvented-storage","title":"OSO Maxi GeoCoil MGC1000 1000L Commercial Heat Pump Cylinder | 15kW 3-Phase High-Capacity Unvented Storage","description":"\u003cdiv class=\"product-description\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eOSO Maxi GeoCoil MGC1000\u003c\/strong\u003e is a \u003cstrong\u003e1000 litre commercial unvented heat pump cylinder\u003c\/strong\u003e from OSO's class-leading MAXI commercial range, designed for maximum hot water production from heat pumps up to 40 kW. Featuring a massive \u003cstrong\u003e7.0 m² smooth scale-resistant titanium alloy coil\u003c\/strong\u003e and advanced \u003cstrong\u003eVIP + NANOPUR insulation\u003c\/strong\u003e, it delivers rapid recovery and exceptional energy efficiency for demanding commercial applications.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1000 litre capacity\u003c\/strong\u003e serves large commercial properties, hotels, schools and multiple dwellings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e7.0 m² oversized primary coil\u003c\/strong\u003e optimised for heat pumps up to 40 kW and solar collectors up to 40 m².\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClass-leading C-rated efficiency\u003c\/strong\u003e with 141W standing heat loss through advanced VIP and foam insulation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e15 kW 3-phase immersion heaters (2 x 7.5 kW)\u003c\/strong\u003e positioned above coil as booster and backup for legionella protection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e10 bar design pressure\u003c\/strong\u003e with EVERLAST™ high-alloy stainless steel and ULTRAWELD™ technology for extreme corrosion resistance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermostat adjustable 60-90°C\u003c\/strong\u003e with anti-legionella cycle and holiday mode for hygiene compliance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact 1000 mm diameter x 2100 mm height\u003c\/strong\u003e maximises capacity in commercial plant rooms.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete factory-fitted controls\u003c\/strong\u003e including expansion vessel, safety valves and motorised zoning.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhy Buy the OSO Maxi GeoCoil MGC1000?\u003c\/h2\u003e\n\u003cp\u003eAs part of OSO's proven \u003cstrong\u003e50-year commercial MAXI series\u003c\/strong\u003e, the MGC1000 offers unmatched durability, efficiency and customisability for high-demand hot water systems while meeting stringent commercial hygiene and energy regulations.\u003c\/p\u003e\n\u003cp\u003eThe combination of \u003cstrong\u003eoversized heat exchanger, high-power electric backup and superior insulation\u003c\/strong\u003e ensures reliable performance with significant lifetime energy savings in the most demanding applications.\u003c\/p\u003e\n\u003ch2\u003eSuitable For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCommercial properties\u003c\/strong\u003e – hotels, restaurants, schools, hospitals, leisure centres with high hot water demand.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMultiple occupancy buildings\u003c\/strong\u003e – student accommodation, care homes, HMO's serving 50+ people.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLarge heat pump systems up to 40 kW\u003c\/strong\u003e requiring high-capacity indirect storage with solar integration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFacilities requiring legionella compliance\u003c\/strong\u003e through high-temperature boost capability.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBrand: \u003cstrong\u003eOSO Hotwater\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eModel: \u003cstrong\u003eMaxi GeoCoil MGC1000 (15 kW 3x230V + HX 7.0 m²)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eType: \u003cstrong\u003eCommercial indirect unvented heat pump cylinder\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCapacity: \u003cstrong\u003e1000 litres (865L actual volume)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eEnergy Rating: \u003cstrong\u003eC (ErP)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eStanding Heat Loss: \u003cstrong\u003e141W \/ ~3.4 kWh\/24hrs (EN12897)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eDimensions: \u003cstrong\u003eØ1000 mm x 2100 mm height\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eWeight: \u003cstrong\u003e225 kg empty \/ ~1225 kg full\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003ePrimary Coil: \u003cstrong\u003e7.0 m² smooth scale-resistant titanium alloy\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eHeat Pump Capacity: \u003cstrong\u003eUp to 40 kW + solar up to 40 m²\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eImmersion Heaters: \u003cstrong\u003e2 x 7.5 kW (15 kW total 3-phase 230\/400V)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eDesign Pressure: \u003cstrong\u003e10 bar\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eThermostat: \u003cstrong\u003e70°C setpoint (adjustable 60-90°C) with safety cut-out\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eTank Material: \u003cstrong\u003eEVERLAST™ high-alloy stainless steel with ULTRAWELD™\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eWarranty: \u003cstrong\u003e5-10 years commercial tank warranty\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eInstallation \u0026amp; Compliance\u003c\/h2\u003e\n\u003cp\u003eFactory-assembled with \u003cstrong\u003ecomplete commercial G3 controls package\u003c\/strong\u003e including oversized expansion vessel, multiple safety valves and zoning controls for professional installation in compliance with UK Building Regulations and commercial hygiene standards.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":62785028161885,"sku":"MGC1000","price":6990.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OsoHotwaterMaxiGeoCoilMGCcommercialcylinderheatpump_b17a8b7a-5eb0-42a1-a4df-7a459a2252f3.jpg?v=1764834066"},{"product_id":"oso-multipoint-w-electric-hot-water-heater-floor-wall-mounted-30-100l-direct-electric-cylinders","title":"OSO Multipoint W Electric Hot Water Heater - Floor \u0026 Wall Mounted 30-100L Direct Electric Cylinders","description":"\u003cdiv class=\"product-description\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eOSO Multipoint W series\u003c\/strong\u003e offers \u003cstrong\u003ecompact floor and wall mounted electric hot water heaters\u003c\/strong\u003e in 30, 50, 80 and 100 litre capacities, perfect for bedsits, small apartments and light commercial applications. Featuring a powerful \u003cstrong\u003e3 kW INCOTEC immersion heater\u003c\/strong\u003e that heats water to 70°C and delivers 20% more usable hot water through the integrated tamperproof blending valve for safe 60°C output.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile floor or wall mounting\u003c\/strong\u003e with compact 435 mm diameter fits kitchen base units and tight spaces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3 kW INCOTEC immersion heater\u003c\/strong\u003e provides rapid recovery and reliable direct electric heating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTamperproof blending valve\u003c\/strong\u003e delivers safe 60°C water while maximising usable capacity by 20%.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNANOPUR insulation\u003c\/strong\u003e ensures ultra-low heat losses (22-45W) for energy efficiency.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-grade stainless steel construction\u003c\/strong\u003e with \u003cstrong\u003e10-year warranty\u003c\/strong\u003e for corrosion resistance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete G3 fittings kit supplied\u003c\/strong\u003e including all safety valves and controls for compliant installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e50 \u0026amp; 80 litre models suitable for single showers\u003c\/strong\u003e with impressive flow rates.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eC-rated ErP efficiency\u003c\/strong\u003e across all sizes with compact, space-saving design.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhy Buy OSO Multipoint W?\u003c\/h2\u003e\n\u003cp\u003eThe Multipoint W series combines \u003cstrong\u003eflexible floor\/wall mounting with superior usable capacity\u003c\/strong\u003e through innovative blending technology, allowing smaller units to replace larger competitors while saving space and energy.\u003c\/p\u003e\n\u003cp\u003eIdeal for \u003cstrong\u003eproperty developers, landlords and light commercial users\u003c\/strong\u003e requiring reliable, compliant electric hot water in minimum footprint.\u003c\/p\u003e\n\u003ch2\u003eSuitable For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBedsits and small apartments\u003c\/strong\u003e needing compact floor or wall mounted solutions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLight commercial applications\u003c\/strong\u003e – offices, guest houses, rental properties.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle shower installations\u003c\/strong\u003e (50L \u0026amp; 80L models) with good flow rates.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpace-constrained locations\u003c\/strong\u003e – kitchen cupboards, utility areas, loft conversions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBrand: \u003cstrong\u003eOSO Hotwater\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eRange: \u003cstrong\u003eMultipoint W (Floor \u0026amp; Wall Mounted)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eAvailable Sizes: \u003cstrong\u003e30L, 50L, 80L, 100L\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eDiameter: \u003cstrong\u003e435 mm (all models)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eHeights: \u003cstrong\u003e542 mm (30L), 697 mm (50L), 1017 mm (80L), 1237 mm (100L)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eWeights Empty: \u003cstrong\u003e14 kg (30L), 17 kg (50L), 24 kg (80L), 28 kg (100L)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eImmersion Heater: \u003cstrong\u003e3 kW INCOTEC (all models)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eThermostat: \u003cstrong\u003e70°C (30\/50L), 60°C (80\/100L)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eHeat Loss: \u003cstrong\u003e22W (30L), 29W (50L), 36W (80L), 45W (100L)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eEnergy Rating: \u003cstrong\u003eC (ErP) all models\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eUsable Capacity @ 40°C: \u003cstrong\u003e52L (30L), 84L (50L), 113L (80L), 142L (100L)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eWarranty: \u003cstrong\u003e10 years stainless steel tank\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eInstallation \u0026amp; Compliance\u003c\/h2\u003e\n\u003cp\u003eSupplied complete with \u003cstrong\u003eG3-compliant fittings kit\u003c\/strong\u003e for safe professional installation. Both \u003cstrong\u003efloor and wall mounting options\u003c\/strong\u003e include all necessary brackets, safety valves and blending controls for immediate use in domestic or light commercial settings.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"30L - 435 mm x 542 mm","offer_id":62785246069085,"sku":"Multipoint W 30","price":670.0,"currency_code":"GBP","in_stock":true},{"title":"50L - 435 mm x 697 mm","offer_id":62785246101853,"sku":"Multipoint W 50","price":790.0,"currency_code":"GBP","in_stock":true},{"title":"80L - 435 mm x 1017 mm","offer_id":62785246134621,"sku":"Multipoint W 80","price":830.0,"currency_code":"GBP","in_stock":true},{"title":"100L  - 435 mm x 1237 mm","offer_id":62785246167389,"sku":"Multipoint W 100","price":890.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/multipoint-4.1-reduced-size-grey-logo-scaled.jpg?v=1764834650"},{"product_id":"oso-nano-n-rm5-mini-undersink-water-heater-compact-floor-wall-mount-5l-point-of-use-electric-hot-water-heater","title":"OSO Nano N RM5 Mini Undersink Water Heater - Compact Floor \u0026 Wall Mount 5L Point-of-Use Electric Hot Water Heater","description":"\u003cdiv class=\"product-description\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eOSO Nano N RM5\u003c\/strong\u003e is a \u003cstrong\u003ecompact 5 litre mini undersink water heater\u003c\/strong\u003e designed for quick and efficient point-of-use hot water supply. With a powerful \u003cstrong\u003e3 kW INCOTEC immersion heater\u003c\/strong\u003e, it heats water rapidly, delivering 5L of 40°C hot water in under 6 minutes—perfect for kitchens, hand wash basins, or small commercial sinks.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact and versatile\u003c\/strong\u003e design suitable for \u003cstrong\u003efloor or wall mounting\u003c\/strong\u003e, ideal for tight spaces and under sink installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-performance 3 kW immersion heater\u003c\/strong\u003e heats water quickly for continuous use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStainless steel construction\u003c\/strong\u003e with exceptional corrosion resistance for long-lasting durability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClass-leading insulation\u003c\/strong\u003e reduces heat loss, saving energy and costs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimple electrical installation\u003c\/strong\u003e with factory-fitted wiring and safety thermostat adjustable between 40-70°C.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes safety valve and mounting bracket\u003c\/strong\u003e with IP44 splash-proof rating for wet environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnergy efficient A-rated efficiency\u003c\/strong\u003e ensures low running costs for homes and light commercial use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhy Buy the OSO Nano N RM5?\u003c\/h2\u003e\n\u003cp\u003eThis ultra-compact heater provides \u003cstrong\u003efast, reliable hot water at point of use\u003c\/strong\u003e with minimal footprint and simple installation. Ideal for locations where hot water demand is low but immediate ready supply is essential.\u003c\/p\u003e\n\u003cp\u003eIts \u003cstrong\u003efloor or wall mounting flexibility\u003c\/strong\u003e combined with robust construction and rapid heat-up capability makes it a top choice for residential and commercial applications.\u003c\/p\u003e\n\u003ch2\u003eSuitable For\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnder sink or basin installation\u003c\/strong\u003e in kitchens, bathrooms, offices, and light commercial environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePoint-of-use hot water needs\u003c\/strong\u003e at hand washbasins, utility sinks, or kitchenette facilities.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact spaces\u003c\/strong\u003e needing a floor or wall-mounted solution with quick heating.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBrand: \u003cstrong\u003eOSO Hotwater\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eModel: \u003cstrong\u003eNano N RM5\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eType: \u003cstrong\u003eUndersink direct electric water heater\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCapacity: \u003cstrong\u003e5 litres\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eHeating element: \u003cstrong\u003e3 kW INCOTEC immersion heater\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eHeating time: \u003cstrong\u003eUnder 6 minutes to 40°C\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eVoltage: \u003cstrong\u003e230V single phase\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eDimensions: \u003cstrong\u003e500 mm height x 234 mm depth x 200 mm width\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eWeight: \u003cstrong\u003e12 kg\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eThermostat range: \u003cstrong\u003e40°C - 70°C adjustable\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eInsulation: \u003cstrong\u003eClass-leading for heat retention and energy saving\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMounting: \u003cstrong\u003eFloor or wall mount (bracket included)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eIngress Protection: \u003cstrong\u003eIP44 splash-proof\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eSafety features: \u003cstrong\u003eThermostat cut-off, pressure relief valve provided\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eWarranty: \u003cstrong\u003e10 years on stainless steel tank, 2 years on components\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eInstallation \u0026amp; Compliance\u003c\/h2\u003e\n\u003cp\u003eDesigned for simple, safe installation with included mounting bracket and G3 safety fittings. Suitable for use in residential and light commercial buildings with full compliance to UK building and electrical regulations.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":62785628012893,"sku":"10806051","price":490.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OsoHotwaterNano-NRM5miniundersinkwaterheater.webp?v=1764836499"},{"product_id":"oso-super-coil-indirect-unvented-cylinders-pre-plumbed-180l-to-300l","title":"OSO SUPER COIL Indirect Unvented Cylinders Pre-Plumbed 180L to 300L","description":"\u003cdiv style=\"font-family:Arial,sans-serif;font-size:16px;color:#222;max-width:900px;margin:0 auto;line-height:1.6;\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eOSO Super Coil SC\u003c\/strong\u003e is an \u003cstrong\u003eindirect unvented pre-plumbed hot water unvented cylinder\u003c\/strong\u003e available from 180L to 300L — engineered with OSO's patented S-Design that puts \u003cstrong\u003eevery valve, vessel, motorised zone valve, and cable connection under a single lid on top of the unit\u003c\/strong\u003e. This \u003cstrong\u003e unvented cylinder \u003c\/strong\u003eunique design cuts installation time by up to \u003cstrong\u003e70%\u003c\/strong\u003e compared to conventional cylinders and makes the SC the \u003cstrong\u003emost space-efficient indirect cylinder\u003c\/strong\u003e on the market. Backed by a \u003cstrong\u003e25-year tank warranty\u003c\/strong\u003e, the SC is the preferred choice for system boiler installations where speed, space, and reliability are non-negotiable.\u003c\/p\u003e\n\u003cdiv style=\"display:flex;flex-wrap:wrap;gap:12px;margin:24px 0;\"\u003e\n\u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align: center;\"\u003e\n\u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e180–300L\u003c\/div\u003e\n\u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eAvailable Sizes\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align: center;\"\u003e\n\u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e70%\u003c\/div\u003e\n\u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eLabour Time Saving\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align: center;\"\u003e\n\u003cdiv style=\"font-size:26px;font-weight:700;\"\u003eAll Top\u003c\/div\u003e\n\u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eConnections\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align: center;\"\u003e\n\u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e3 kW\u003c\/div\u003e\n\u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eBackup Immersion\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align: center;\"\u003e\n\u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e25 yr\u003c\/div\u003e\n\u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eTank Warranty\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#e6f4f3;border-left:4px solid #008377CF;border-radius:6px;padding:16px 20px;margin:20px 0;\"\u003e\n\u003cstrong\u003ePatented Pre-Plumbed Design — Every Connection on Top\u003c\/strong\u003e\u003cbr\u003eThe OSO Super Coil is unique: the \u003cstrong\u003eblending valve, T\u0026amp;P valve, dual expansion vessels, motorised zone valve, and all pipework are factory-assembled under the top lid\u003c\/strong\u003e. Installers connect just the primary flow\/return, cold water in, hot water out, and electrical supply — all from the top. A \u003cstrong\u003efitting template\u003c\/strong\u003e is supplied for fast pipework preparation before the cylinder is even in position.\u003c\/div\u003e\n\u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px;margin:28px 0 14px;font-size:17px;font-weight:700;\"\u003eKey Features\u003c\/div\u003e\n\u003cdiv style=\"display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;margin-bottom:28px;\"\u003e\n\u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n\u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e🔧 Up to 70% Faster Installation\u003c\/div\u003e\n\u003cp style=\"margin:0;font-size:15px;\"\u003eOSO's field testing showed that \u003cstrong\u003emore SC cylinders were installed in the same time as competitors' products\u003c\/strong\u003e thanks to the all-top connection design. Pre-plumbed, pre-wired, and supplied with a fitting template — the SC dramatically reduces commissioning time and labour cost.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n\u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e📦 Integral G3 Kit Under the Lid\u003c\/div\u003e\n\u003cp style=\"margin:0;font-size:15px;\"\u003eThe \u003cstrong\u003ecomplete G3 unvented kit is factory-fitted\u003c\/strong\u003e: 2-port Honeywell zone valve, strainer, PRV, expansion relief valve, drain cock, tundish, and \u003cstrong\u003etwo factory-fitted 6L expansion vessels\u003c\/strong\u003e. All components are hidden under the top lid — no exposed pipework runs and no external vessel to mount separately.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n\u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e📏 Shortest Cylinder System on the Market\u003c\/div\u003e\n\u003cp style=\"margin:0;font-size:15px;\"\u003eBecause all ancillaries are integrated on top, the SC occupies \u003cstrong\u003eless total height\u003c\/strong\u003e than any equivalent cylinder plus its associated external equipment. SC cylinders up to 210L can also \u003cstrong\u003eshare a footprint with a washing machine\u003c\/strong\u003e using the optional OSO washing machine frame.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n\u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e⚡ INCOTEC 3kW Backup Immersion\u003c\/div\u003e\n\u003cp style=\"margin:0;font-size:15px;\"\u003eThe \u003cstrong\u003eINCOTEC immersion heater\u003c\/strong\u003e provides electric backup independently of the primary boiler circuit. It is fully compatible with \u003cstrong\u003esolar PV diverters\u003c\/strong\u003e and smart electricity tariffs — connecting via an appropriate interface for solar panel systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n\u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e🔒 ULTRAWELD Stainless Steel Tank\u003c\/div\u003e\n\u003cp style=\"margin:0;font-size:15px;\"\u003eThe inner vessel is fabricated from \u003cstrong\u003e1.3mm stainless steel\u003c\/strong\u003e using OSO's ULTRAWELD process — superior weld quality and corrosion resistance backed by a genuine \u003cstrong\u003e25-year tank warranty\u003c\/strong\u003e. Suitable for all UK water hardness zones.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n\u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e📊 Smooth Limescale-Resistant Coil\u003c\/div\u003e\n\u003cp style=\"margin:0;font-size:15px;\"\u003eThe \u003cstrong\u003esmooth heating coil\u003c\/strong\u003e does not encourage limescale build-up — maintaining heat transfer efficiency over the long term and reducing the need for maintenance descaling treatments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n\u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e🌡️ Digital Thermostat with S \u0026amp; Y Plan\u003c\/div\u003e\n\u003cp style=\"margin:0;font-size:15px;\"\u003eSupplied with an \u003cstrong\u003eadjustable thermostat (20–70°C, preset 60°C)\u003c\/strong\u003e and the Honeywell 2-port zone valve factory-fitted. Compatible with both \u003cstrong\u003eS-plan and Y-plan\u003c\/strong\u003e central heating systems — no additional valve procurement required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n\u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e🔍 Maintenance-Friendly Access\u003c\/div\u003e\n\u003cp style=\"margin:0;font-size:15px;\"\u003eBecause all components are concentrated at the top of the unit, \u003cstrong\u003eannual servicing and component access is straightforward\u003c\/strong\u003e — the engineer doesn't need to reach behind or underneath the cylinder for routine maintenance checks.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#fff5f5;border-left:4px solid #c0392b;border-radius:6px;padding:16px 20px;margin:20px 0;\"\u003e\n\u003cstrong\u003e⚠️ G3 Unvented Installation Required\u003c\/strong\u003e\u003cbr\u003eMust be installed by a \u003cstrong\u003eG3 registered competent engineer\u003c\/strong\u003e. All installation work must comply with Building Regulation G3 and Water Regulations. Solid fuel boilers and non-thermostatically controlled heat sources must not be connected.\u003c\/div\u003e\n\u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px;margin:28px 0 14px;font-size:17px;font-weight:700;\"\u003eTechnical Specifications by Model\u003c\/div\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:14px;\"\u003e\u003ctbody\u003e\n\u003ctr style=\"background:#005c54;color:#fff;\"\u003e\n\u003cth style=\"padding:9px 10px;text-align:left;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"padding:9px 10px;text-align:center;\"\u003eSC 180\u003c\/th\u003e\n\u003cth style=\"padding:9px 10px;text-align:center;\"\u003eSC 210\u003c\/th\u003e\n\u003cth style=\"padding:9px 10px;text-align:center;\"\u003eSC 250\u003c\/th\u003e\n\u003cth style=\"padding:9px 10px;text-align:center;\"\u003eSC 300\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eProduct No.\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e11011672\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e11011673\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e11011674\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e11011676\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eVolume (L)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e170\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e197\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e249\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e281\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eCapacity @ 40°C (L)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e272\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e333\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e412\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e454\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eDiameter (mm)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e595\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e595\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e595\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e595\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eHeight (mm)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e1,200\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e1,375\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e1,645\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e1,780\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eWeight Empty (kg)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e45\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e55\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e57\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e61\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eHeat Loss (kWh\/day)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e1.32\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e1.40\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e1.65\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e1.77\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eErP Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003eB\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003eB\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003eC\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003eC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003ePrimary Coil (m²)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e1.0\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e1.0\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e1.0\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #c8e6e3;text-align:center;\"\u003e1.1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:8px 10px;\"\u003e\u003cstrong\u003eImmersion Heater\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;text-align:center;\" colspan=\"4\"\u003e3 kW \/ 1 × 240V (all models)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px;margin:32px 0 14px;font-size:17px;font-weight:700;\"\u003eFrequently Asked Questions\u003c\/div\u003e\n\u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eWhy is all-top connection so valuable for installers?\u003c\/summary\u003e\u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eWith a conventional cylinder, the installer must run cold feed, hot output, primary flow and return, expansion vessel pipework, and discharge pipework to various points around the cylinder — often in a tight cupboard. The SC's \u003cstrong\u003eall-top connection design\u003c\/strong\u003e means all pipework drops straight down from the top lid, enabling faster, neater, and more predictable installations. The supplied fitting template lets installers prepare the pipework before the cylinder arrives on site.\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eIs the Super Coil compatible with a combi boiler?\u003c\/summary\u003e\u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eNo. The Super Coil SC is an \u003cstrong\u003eindirect cylinder designed for use with a system boiler\u003c\/strong\u003e (not a combi boiler). A system boiler provides the primary circuit that feeds the SC's internal heating coil. If you have a combi boiler and wish to add a cylinder, the entire boiler setup would need to be changed to a system boiler.\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eWhat size Super Coil do I need?\u003c\/summary\u003e\u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eAs a general guide: \u003cstrong\u003e180L\u003c\/strong\u003e suits 1–3 people; \u003cstrong\u003e210L\u003c\/strong\u003e suits 3–4 people; \u003cstrong\u003e250L\u003c\/strong\u003e suits 4–5 people; \u003cstrong\u003e300L\u003c\/strong\u003e suits 5+ people or high-demand properties. OSO's online water calculator can help size the cylinder accurately based on your specific household hot water usage profile.\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eCan the SC's immersion heater be used with solar panels?\u003c\/summary\u003e\u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eYes. The INCOTEC immersion heater can be connected to \u003cstrong\u003esolar PV panels via an appropriate interface\u003c\/strong\u003e (solar diverter such as myenergi Eddi or Solic 200). This diverts surplus solar electricity into hot water — maximising self-consumption and reducing energy bills.\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eHow often does the Super Coil need servicing?\u003c\/summary\u003e\u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eAnnual servicing is required to maintain G3 compliance and the OSO warranty. A service includes checking the \u003cstrong\u003eT\u0026amp;P relief valve, expansion vessel pre-charge, thermostat function, zone valve operation, and visual condition\u003c\/strong\u003e. Because all components are at the top of the cylinder, OSO describes the SC as \u003cstrong\u003e\"maintenance friendly\"\u003c\/strong\u003e — faster to service than most cylinder designs.\u003c\/div\u003e\u003c\/details\u003e\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"SC 180 – 180L","offer_id":62862246478173,"sku":"SC180","price":1230.0,"currency_code":"GBP","in_stock":true},{"title":"SC 210 – 210L","offer_id":62862249263453,"sku":"SC210","price":1300.0,"currency_code":"GBP","in_stock":true},{"title":"SC 250 – 250L","offer_id":62862249296221,"sku":"SC250","price":1400.0,"currency_code":"GBP","in_stock":true},{"title":"SC 300 – 300L","offer_id":62862249328989,"sku":"SC300","price":1530.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OsoHotwaterSuperCoilindirectcylinderpre-plumbed.jpg?v=1765562111"},{"product_id":"oso-aquasustain-dhp-200-litre-integrated-heat-pump-cylinder","title":"OSO AquaSustain DHP 200L Integrated Heat Pump Cylinder | MEV | R290 | A+ | G3 Kit Included","description":"\u003cstyle\u003e\n  .oso-wrap{font-family:inherit;color:inherit;line-height:1.7;font-size:16px}\n  .oso-wrap p,.oso-wrap li,.oso-wrap td,.oso-wrap th{font-size:16px!important;line-height:1.7}\n  .oso-wrap h2{font-size:22px!important;font-weight:700;color:#1a3a5c;border-bottom:3px solid #0077b6;padding-bottom:6px;margin:2rem 0 1rem;line-height:1.3}\n  .oso-wrap h3{font-size:17px!important;font-weight:700;color:#1a3a5c;margin:1.2rem 0 0.4rem;line-height:1.4}\n  .oso-wrap p{margin:0 0 1rem}\n  .oso-wrap ul{padding-left:1.5rem;margin:0 0 1rem}\n  .oso-wrap ul li{margin-bottom:0.5rem}\n\n   Badge pills ,\n  .oso-badge{display:inline-block;font-size:13px!important;font-weight:700;border-radius:4px;padding:2px 10px;margin-right:5px;margin-bottom:4px;vertical-align:middle}\n  .oso-badge.blue{background:#0077b6;color:#fff}\n  .oso-badge.navy{background:#1a3a5c;color:#fff}\n  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1.4rem;border-radius:0 6px 6px 0;margin-bottom:1.5rem}\n  .oso-intro-box p{margin:0!important}\n  .oso-comp-box{background:#fff3cd;border:1px solid #ffc107;border-radius:5px;padding:0.9rem 1.1rem;margin:0.8rem 0 1.2rem}\n\n   Feature card grid ,\n  .oso-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:0.85rem;margin-bottom:1.2rem}\n  .oso-card{background:#e0f2fe;border:1px solid #90caf9;border-radius:6px;padding:1rem 1.1rem;line-height:1.6}\n  .oso-card strong{display:block;color:#1a3a5c;margin-bottom:0.35rem;font-size:16px!important}\n\n   In the box ,\n  .oso-info-box{background:#f0fdf4;border:1px solid #86efac;border-radius:6px;padding:1rem 1.2rem;margin:1.2rem 0}\n  .oso-info-box p{margin:0 0 0.5rem!important;color:#065f46;font-weight:700}\n\n   Spec table ,\n  .oso-spec-table{width:100%;border-collapse:collapse;margin-bottom:1.5rem}\n  .oso-spec-table th{background:#1a3a5c;color:#fff!important;text-align:left;padding:0.7rem 1rem;font-weight:700;font-size:16px!important}\n  .oso-spec-table td{padding:0.6rem 1rem;border-bottom:1px solid #bde0f5;vertical-align:top;font-size:16px!important}\n  .oso-spec-table tr:nth-child(even) td{background:#e0f2fe}\n  .oso-spec-table td:first-child{font-weight:600;color:#111;width:44%}\n\n   Recovery table ,\n  .oso-recovery-table{width:100%;border-collapse:collapse;margin:1rem 0 1.5rem}\n  .oso-recovery-table th{background:#0d9488;color:#fff!important;text-align:left;padding:0.7rem 1rem;font-weight:700;font-size:16px!important}\n  .oso-recovery-table td{padding:0.6rem 1rem;border-bottom:1px solid #b2dfdb;vertical-align:middle;font-size:16px!important}\n  .oso-recovery-table tr:nth-child(even) td{background:#e0f7f5}\n  .oso-recovery-table td:first-child{font-weight:600;color:#111;width:55%}\n  .oso-recovery-note{background:#e0f7f5;border-left:4px solid #0d9488;padding:0.8rem 1.2rem;border-radius:0 6px 6px 0;margin-top:-0.5rem;margin-bottom:1.5rem}\n  .oso-recovery-note p{margin:0!important;font-size:15px!important;color:#004d40}\n\n   Installation notes ,\n  .oso-install-box{background:#f8f9fa;border:1px solid #dee2e6;border-radius:8px;padding:1.2rem 1.4rem;margin-top:1.5rem}\n  .oso-install-box h3{margin-top:0!important;color:#1a3a5c;border-bottom:2px solid #dee2e6;padding-bottom:0.4rem;margin-bottom:0.8rem}\n  .oso-install-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:0.75rem;margin-top:0.75rem}\n  .oso-install-item{background:#fff;border:1px solid #dee2e6;border-radius:6px;padding:0.75rem 0.9rem;font-size:15px!important;line-height:1.5}\n  .oso-install-item strong{display:block;color:#1a3a5c;margin-bottom:0.2rem;font-size:15px!important}\n\n   FAQs ,\n  .oso-faq-item{border-bottom:1px solid #bde0f5;padding:0.9rem 0}\n  .oso-faq-item:last-child{border-bottom:none}\n  .oso-faq-item strong{color:#1a3a5c;font-size:16px!important;display:block;margin-bottom:0.3rem}\n\u003c\/style\u003e\n\u003cdiv class=\"oso-wrap\"\u003e\n\n  \u003c!-- Badge pills --\u003e\n  \u003cdiv style=\"margin-bottom:1rem\"\u003e\n    \u003cspan class=\"oso-badge blue\"\u003eAquaSustain DHP 200\u003c\/span\u003e\n    \u003cspan class=\"oso-badge navy\"\u003e200 Litres\u003c\/span\u003e\n    \u003cspan class=\"oso-badge teal\"\u003eR290 Refrigerant\u003c\/span\u003e\n    \u003cspan class=\"oso-badge green\"\u003eEnergy Class A+\u003c\/span\u003e\n    \u003cspan class=\"oso-badge grey\"\u003eMEV Compatible\u003c\/span\u003e\n    \u003cspan class=\"oso-badge grey\"\u003eG3 Kit Included\u003c\/span\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Feature icon strip --\u003e\n  \u003cdiv class=\"oso-feature-strip\"\u003e\n    \u003cdiv class=\"oso-feat\"\u003e\n      \u003cdiv class=\"feat-icon\"\u003e🌿\u003c\/div\u003e\n      \u003cdiv class=\"feat-label\"\u003eR290 Refrigerant\u003c\/div\u003e\n      \u003cdiv class=\"feat-value\"\u003eGWP 3 · Zero ODP\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"oso-feat\"\u003e\n      \u003cdiv class=\"feat-icon\"\u003e⚡\u003c\/div\u003e\n      \u003cdiv class=\"feat-label\"\u003eEnergy Class A+\u003c\/div\u003e\n      \u003cdiv class=\"feat-value\"\u003eCOP up to 3.16\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"oso-feat\"\u003e\n      \u003cdiv class=\"feat-icon\"\u003e🌡️\u003c\/div\u003e\n      \u003cdiv class=\"feat-label\"\u003eUp to 60°C\u003c\/div\u003e\n      \u003cdiv class=\"feat-value\"\u003eHeat pump only\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"oso-feat\"\u003e\n      \u003cdiv class=\"feat-icon\"\u003e🏠\u003c\/div\u003e\n      \u003cdiv class=\"feat-label\"\u003eMEV Compatible\u003c\/div\u003e\n      \u003cdiv class=\"feat-value\"\u003eWhole-home ventilation\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"oso-feat\"\u003e\n      \u003cdiv class=\"feat-icon\"\u003e⏱️\u003c\/div\u003e\n      \u003cdiv class=\"feat-label\"\u003eHeat-Up Time\u003c\/div\u003e\n      \u003cdiv class=\"feat-value\"\u003e~6h 12m (ECO mode)\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"oso-feat\"\u003e\n      \u003cdiv class=\"feat-icon\"\u003e🔧\u003c\/div\u003e\n      \u003cdiv class=\"feat-label\"\u003eG3 Kit Included\u003c\/div\u003e\n      \u003cdiv class=\"feat-value\"\u003eReady to install\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"oso-feat\"\u003e\n      \u003cdiv class=\"feat-icon\"\u003e🛡️\u003c\/div\u003e\n      \u003cdiv class=\"feat-label\"\u003eStainless Steel\u003c\/div\u003e\n      \u003cdiv class=\"feat-value\"\u003e10-year warranty\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"oso-feat\"\u003e\n      \u003cdiv class=\"feat-icon\"\u003e☀️\u003c\/div\u003e\n      \u003cdiv class=\"feat-label\"\u003ePV Ready\u003c\/div\u003e\n      \u003cdiv class=\"feat-value\"\u003eSolar integration\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Intro summary box --\u003e\n  \u003cdiv class=\"oso-intro-box\"\u003e\n    \u003cp\u003e\u003cstrong\u003eOSO AquaSustain DHP 200L Integrated Heat Pump Cylinder\u003c\/strong\u003e — 200L stainless steel cylinder with integrated air-source heat pump  |  R290 refrigerant (GWP 3, ODP 0)  |  Energy Class A+  |  COP up to 3.16  |  Up to 60°C (heat pump) · 70°C (with 1,500W heater)  |  ~6h 12m heat-up (ECO mode)  |  MEV-compatible  |  G3 kit included  |  Ambient -10°C to 40°C  |  NCM (SAP) ID: 108965\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- MEV callout --\u003e\n  \u003cdiv class=\"oso-comp-box\"\u003e\n    \u003cstrong style=\"color:#856404\"\u003eℹ️ What is MEV (Mechanical Extract Ventilation)?\u003c\/strong\u003e\n    \u003cp style=\"margin:0.3rem 0 0;color:#5a3a00\"\u003eThe AquaSustain DHP is classified as an \u003cstrong\u003eExhaust Air MEV Heat Pump\u003c\/strong\u003e. Instead of drawing fresh outside air directly, it can extract warm, moist and stale air from kitchens, bathrooms and utility rooms — recycling the heat from that air into domestic hot water. This simultaneously ventilates the property and heats water, making it especially well suited to new-build homes and retrofit projects where whole-home ventilation is required.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cp\u003eThe \u003cstrong\u003eOSO AquaSustain DHP 200L\u003c\/strong\u003e is a fully self-contained, integrated heat pump water heater — combining a 200-litre stainless steel unvented cylinder in the lower section with an air-source heat pump unit in the upper section, all in a single compact floor-standing unit. There is no need for a separate outdoor unit, separate cylinder, or additional buffer tank.\u003c\/p\u003e\n  \u003cp\u003eUsing R290 natural refrigerant (150g charge, GWP 3), the AquaSustain delivers a COP of up to 3.16 — producing over three times as much heat energy as it consumes in electricity. It can heat water to 60°C using the heat pump alone, with a 1,500W titanium electric backup element capable of reaching 70°C for anti-Legionella or high-demand top-up. The unit is designed for continuous, low-rate operation — heating the tank steadily over several hours rather than in short bursts — which keeps the COP consistently high and running costs low.\u003c\/p\u003e\n  \u003cp\u003eThe AquaSustain ships complete with a full G3 unvented kit (expansion vessel, inlet group, T\u0026amp;P valve, tundish), anti-vibration feet, condensate drain fitting, and two 160mm duct adaptors. It is listed on the Government's Product Characteristics Database (NCM SAP ID: 108965) as an Exhaust Air MEV heat pump, making it eligible for compliance pathways under Part L Building Regulations.\u003c\/p\u003e\n\n  \u003ch2\u003eKey Features\u003c\/h2\u003e\n  \u003cdiv class=\"oso-grid\"\u003e\n    \u003cdiv class=\"oso-card\"\u003e\n\u003cstrong\u003eIntegrated All-in-One Design\u003c\/strong\u003eHeat pump and hot water cylinder in a single floor-standing unit — no separate outdoor unit, no external cylinder, no additional pipework between components. Single-footprint installation in a cupboard, utility room or plant room.\u003c\/div\u003e\n    \u003cdiv class=\"oso-card\"\u003e\n\u003cstrong\u003eMEV Exhaust Air Heat Pump\u003c\/strong\u003eDraws warm, moist air from kitchens and bathrooms via ductwork, recovering its heat into hot water while simultaneously ventilating the property. Classified as an Exhaust Air MEV unit on the Government's Product Characteristics Database.\u003c\/div\u003e\n    \u003cdiv class=\"oso-card\"\u003e\n\u003cstrong\u003eR290 Refrigerant · A+ Rated\u003c\/strong\u003eGWP 3, ODP 0 — 150g charge. Energy Class A+ with COP of 2.95 (average climate) and 3.16 (warm climate). Produces over three times the heat energy it consumes compared to 1:1 for a direct-electric heater.\u003c\/div\u003e\n    \u003cdiv class=\"oso-card\"\u003e\n\u003cstrong\u003e~6h 12m Heat-Up Time (ECO Mode)\u003c\/strong\u003eFull heat-up from cold in ECO (heat pump only) mode takes approximately 6 hours 12 minutes — designed for overnight or off-peak tariff operation. With the 1,500W backup element active, heat-up is significantly faster for top-up or urgent demand.\u003c\/div\u003e\n    \u003cdiv class=\"oso-card\"\u003e\n\u003cstrong\u003eStainless Steel Tank · 10-Year Warranty\u003c\/strong\u003eThe 200L cylinder is constructed from stainless steel for long-term corrosion resistance — no enamel lining or magnesium anode required. OSO's ULTRAWELD manufacturing process ensures tank integrity, backed by a 10-year cylinder warranty.\u003c\/div\u003e\n    \u003cdiv class=\"oso-card\"\u003e\n\u003cstrong\u003e1,500W Titanium Electric Backup\u003c\/strong\u003eTitanium-alloy immersion element provides corrosion-resistant, limescale-resistant backup heating to 70°C — for fast top-up during high-demand periods or anti-Legionella cycles. Maximum combined power input is 2,000W.\u003c\/div\u003e\n    \u003cdiv class=\"oso-card\"\u003e\n\u003cstrong\u003eG3 Kit Included\u003c\/strong\u003eShips with a complete unvented G3 safety kit: expansion vessel, 3 bar inlet pressure reducer, 6 bar safety valve, ½\" T\u0026amp;P valve, Ø15mm × Ø22mm tundish and anti-vibration feet — reducing installation cost and ensuring all safety components are to hand.\u003c\/div\u003e\n    \u003cdiv class=\"oso-card\"\u003e\n\u003cstrong\u003eFlexible Air Ducting\u003c\/strong\u003eAccepts 150mm, 160mm or 200mm round ducting on both intake and exhaust — two 160mm duct adaptors supplied. Air can be drawn from inside the property (MEV mode) or directly from outside (fresh-air mode) depending on installation requirements.\u003c\/div\u003e\n    \u003cdiv class=\"oso-card\"\u003e\n\u003cstrong\u003eSolar PV Integration\u003c\/strong\u003ePV-ready: the unit accepts an external signal input to switch to heating mode when excess solar generation is available — maximising self-consumption and reducing grid import costs.\u003c\/div\u003e\n    \u003cdiv class=\"oso-card\"\u003e\n\u003cstrong\u003eAnti-Legionella Mode\u003c\/strong\u003eAutomatic scheduled anti-Legionella cycle raises the cylinder to maximum temperature, meeting UK water safety guidelines without manual intervention. The titanium element ensures reliable, corrosion-free performance on high-temperature cycles.\u003c\/div\u003e\n    \u003cdiv class=\"oso-card\"\u003e\n\u003cstrong\u003eTouch Controller\u003c\/strong\u003eIntegrated touch control panel for local operation — set target temperature, select modes (ECO, AUTO, Boost, Holiday, Anti-Legionella) and monitor system status without requiring a separate app or controller.\u003c\/div\u003e\n    \u003cdiv class=\"oso-card\"\u003e\n\u003cstrong\u003eWide Ambient Range: -10°C to 40°C\u003c\/strong\u003eOperates down to -10°C ambient — suitable for year-round UK use including cold utility rooms and garages. The electric backup element ensures hot water availability at all ambient temperatures.\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eRecovery \u0026amp; Heat-Up Times\u003c\/h2\u003e\n  \u003cp\u003eHeat-up time is measured from a cold start in ECO mode (heat pump only), per EN16147. The AquaSustain is designed to heat continuously over an extended period — it should remain powered at all times unless the property will be unoccupied for more than 24 hours.\u003c\/p\u003e\n  \u003ctable class=\"oso-recovery-table\"\u003e\n    \u003ctr\u003e\n      \u003cth\u003eMode \u0026amp; Conditions\u003c\/th\u003e\n      \u003cth\u003e200L DHP\u003c\/th\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eECO mode — heat pump only (full heat-up from cold)\u003c\/td\u003e\n      \u003ctd\u003e~6h 12m (372 min)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eBoost mode — 1,500W electric element + heat pump (2,000W total)\u003c\/td\u003e\n      \u003ctd\u003eSignificantly faster — recommended for top-up or urgent demand\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eContinuous hot water output — heat pump heating power range\u003c\/td\u003e\n      \u003ctd\u003e1,005–1,750W heating power\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eAnnual electricity consumption (average climate, load profile L)\u003c\/td\u003e\n      \u003ctd\u003e830 kWh\/year\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eAnnual electricity consumption (cold climate)\u003c\/td\u003e\n      \u003ctd\u003e1,094 kWh\/year\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eStandby heat loss\u003c\/td\u003e\n      \u003ctd\u003e1.57 kWh\/24h (67W)\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/table\u003e\n  \u003cdiv class=\"oso-recovery-note\"\u003e\n    \u003cp\u003e💡 \u003cstrong\u003eTip:\u003c\/strong\u003e The AquaSustain's ~6h 12m ECO heat-up time fits comfortably within a standard Economy 7 or off-peak tariff window. Schedule via the touch controller to run during your cheapest rate period. For households on Octopus Go or similar smart tariffs, PV mode can further reduce running costs by using free solar export energy for top-up heating during the day.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n  \u003ctable class=\"oso-spec-table\"\u003e\n    \u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBrand \/ Range\u003c\/td\u003e\n\u003ctd\u003eOSO Hotwater \/ AquaSustain DHP\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eAquaSustain DHP 200\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eNCM (SAP) Identifier\u003c\/td\u003e\n\u003ctd\u003e108965\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTank Capacity\u003c\/td\u003e\n\u003ctd\u003e200L\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTank Construction\u003c\/td\u003e\n\u003ctd\u003eStainless steel (ULTRAWELD)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTank Warranty\u003c\/td\u003e\n\u003ctd\u003e10 years\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eRefrigerant \/ Charge\u003c\/td\u003e\n\u003ctd\u003eR290 \/ 150g — GWP 3, ODP 0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eEnergy Efficiency Class\u003c\/td\u003e\n\u003ctd\u003eA+\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eLoad Profile (EN16147)\u003c\/td\u003e\n\u003ctd\u003eL\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCOP (average climate)\u003c\/td\u003e\n\u003ctd\u003e2.95\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCOP (warm climate)\u003c\/td\u003e\n\u003ctd\u003e3.16\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eWater Heating Energy Efficiency (average climate)\u003c\/td\u003e\n\u003ctd\u003e133%\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHeat Pump Heating Power Range\u003c\/td\u003e\n\u003ctd\u003e1,005–1,750W\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHeat Pump Power Input Range\u003c\/td\u003e\n\u003ctd\u003e405–500W\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAuxiliary Electric Heater\u003c\/td\u003e\n\u003ctd\u003e1,500W titanium element\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMax Combined Power Input\u003c\/td\u003e\n\u003ctd\u003e2,000W\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMax Temperature (heat pump only)\u003c\/td\u003e\n\u003ctd\u003e60°C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMax Temperature (with electric heater)\u003c\/td\u003e\n\u003ctd\u003e70°C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDHW Temperature Range\u003c\/td\u003e\n\u003ctd\u003e35–60°C (HP) · up to 70°C (with element)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDefault Temperature (ECO \/ AUTO)\u003c\/td\u003e\n\u003ctd\u003e55°C \/ 60°C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHeat-Up Time ECO Mode (cold start)\u003c\/td\u003e\n\u003ctd\u003e~6h 12m (372 min)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eStandby Heat Loss\u003c\/td\u003e\n\u003ctd\u003e1.57 kWh\/24h (67W)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAnnual Electricity Consumption (cold climate)\u003c\/td\u003e\n\u003ctd\u003e1,094 kWh\/year\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAnnual Electricity Consumption (average climate)\u003c\/td\u003e\n\u003ctd\u003e830 kWh\/year\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAnnual Electricity Consumption (warm climate)\u003c\/td\u003e\n\u003ctd\u003e772 kWh\/year\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAmbient Temperature Range\u003c\/td\u003e\n\u003ctd\u003e-10°C to 40°C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSound Power\u003c\/td\u003e\n\u003ctd\u003e53 dB(A)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSound Pressure @2m (high speed)\u003c\/td\u003e\n\u003ctd\u003e45.9 dB(A)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSound Pressure @2m (low speed)\u003c\/td\u003e\n\u003ctd\u003e41 dB(A)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAir Connection Diameter\u003c\/td\u003e\n\u003ctd\u003e150 \/ 160 \/ 200mm (2× 160mm adaptors supplied)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMin Air Flow (external supply)\u003c\/td\u003e\n\u003ctd\u003e215 m³\/h\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMin Air Flow (internal \/ MEV supply)\u003c\/td\u003e\n\u003ctd\u003e190 m³\/h\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMax Air Flow Rate (speed 3)\u003c\/td\u003e\n\u003ctd\u003e438 m³\/h\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePower Supply\u003c\/td\u003e\n\u003ctd\u003e230V \/ 1ph \/ 50Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMax Operating Pressure\u003c\/td\u003e\n\u003ctd\u003e6 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eWater Inlet \/ Outlet Connection\u003c\/td\u003e\n\u003ctd\u003e¾\" F\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eT\u0026amp;P Safety Valve Connection\u003c\/td\u003e\n\u003ctd\u003e½\" F\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHeat Exchanger Area\u003c\/td\u003e\n\u003ctd\u003e0.39 m²\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDimensions (W × D × H)\u003c\/td\u003e\n\u003ctd\u003e584 × 624 × 1,540mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eNet Weight (empty)\u003c\/td\u003e\n\u003ctd\u003e80 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eWeight (full)\u003c\/td\u003e\n\u003ctd\u003e280 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePackaged Weight\u003c\/td\u003e\n\u003ctd\u003e87.5 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\n  \u003ch2\u003eWhat's Included\u003c\/h2\u003e\n  \u003cdiv class=\"oso-info-box\"\u003e\n    \u003cp\u003eIn the Box — G3 Kit \u0026amp; Accessories Supplied\u003c\/p\u003e\n    \u003cp style=\"color:#333;font-weight:400;margin:0!important\"\u003e\n      \u003cstrong\u003eAquaSustain unit\u003c\/strong\u003e with touch controller, insulation and anti-vibration feet.\u003cbr\u003e\n      \u003cstrong\u003eG3 Unvented Kit:\u003c\/strong\u003e Expansion vessel · 3 bar inlet pressure reducer · 6 bar safety valve · ½\" T\u0026amp;P valve · Ø15mm × Ø22mm tundish.\u003cbr\u003e\n      \u003cstrong\u003eAlso included:\u003c\/strong\u003e Condensate drain fitting · Drainage nozzle · 2× 160mm duct adaptors · User manual.\u003cbr\u003e\n      \u003cem\u003eDucting, additional fittings and commissioning by a G3-qualified engineer are required and not included.\u003c\/em\u003e\n    \u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"oso-faq-item\"\u003e\n\u003cstrong\u003eHow long does the AquaSustain DHP 200L take to heat up from cold?\u003c\/strong\u003e\u003cp\u003eIn ECO mode (heat pump only), the 200L tank heats from cold in approximately 6 hours 12 minutes (372 minutes). The unit is designed for continuous low-rate operation — it should remain switched on at all times for normal use. Activating Boost mode (heat pump + 1,500W electric element, 2,000W combined) provides significantly faster heat-up for urgent demand or top-up situations.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"oso-faq-item\"\u003e\n\u003cstrong\u003eWhat is MEV and does the AquaSustain need a separate ventilation system?\u003c\/strong\u003e\u003cp\u003eMEV stands for Mechanical Extract Ventilation. The AquaSustain is classified as an Exhaust Air MEV heat pump — it can extract warm, moist and stale air from kitchens, bathrooms and utility rooms via ductwork, recovering that heat into hot water while simultaneously ventilating the property. This makes it particularly well suited to new-build homes where whole-house MEV is required under Part F Building Regulations. It can also operate in fresh-air mode, drawing directly from outside.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"oso-faq-item\"\u003e\n\u003cstrong\u003eIs the G3 unvented kit included in the price?\u003c\/strong\u003e\u003cp\u003eYes. The AquaSustain DHP 200 ships with a complete G3 unvented safety kit: expansion vessel, 3 bar inlet pressure reducing valve, 6 bar safety valve, ½\" T\u0026amp;P relief valve, and tundish. Anti-vibration feet, condensate drain fitting and two 160mm duct adaptors are also included. The installer will need to supply ducting and any additional plumbing fittings to suit the specific installation.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"oso-faq-item\"\u003e\n\u003cstrong\u003eCan the AquaSustain be connected to solar PV?\u003c\/strong\u003e\u003cp\u003eYes. The unit accepts an external PV signal input — when connected to a compatible solar diverter or export controller, it will switch to heating mode automatically when excess generation is available, using free solar electricity to heat the tank rather than exporting it to the grid.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"oso-faq-item\"\u003e\n\u003cstrong\u003eIs this suitable as a replacement for an existing unvented cylinder?\u003c\/strong\u003e\u003cp\u003eIn many cases, yes — the AquaSustain has a similar footprint to a standard 200L unvented cylinder and includes the G3 safety kit. The main additional requirements are a suitable air duct connection (150\/160\/200mm) and sufficient space for the unit's height of 1,540mm. Installation must be carried out by a G3-qualified engineer and notified to building control under Part G3.\u003c\/p\u003e\n\u003c\/div\u003e\n\n  \u003c!-- Installation Notes --\u003e\n  \u003cdiv class=\"oso-install-box\"\u003e\n    \u003ch3\u003e🔧 Installation Notes\u003c\/h3\u003e\n    \u003cp style=\"margin-bottom:0.75rem;font-size:15px!important;color:#444\"\u003eThe OSO AquaSustain DHP 200L is a mains-pressure unvented heat pump water heater and must be installed by a G3-qualified engineer in accordance with Building Regulations Part G3, Part F (ventilation) and the manufacturer's installation manual. Key requirements are summarised below.\u003c\/p\u003e\n    \u003cdiv class=\"oso-install-grid\"\u003e\n      \u003cdiv class=\"oso-install-item\"\u003e\n        \u003cstrong\u003e⚡ Electrical Supply\u003c\/strong\u003e\n        230V \/ 1ph \/ 50Hz dedicated circuit required. Maximum power input is 2,000W (heat pump + electric element). Suitable MCB and RCD protection to BS 7671 required. Power connection is at the rear of the unit.\n      \u003c\/div\u003e\n      \u003cdiv class=\"oso-install-item\"\u003e\n        \u003cstrong\u003e🌡️ G3 Unvented Compliance\u003c\/strong\u003e\n        Installation must be carried out by a G3-qualified installer and notified to local building control under Building Regulations Part G3. All G3 safety components are supplied with the unit.\n      \u003c\/div\u003e\n      \u003cdiv class=\"oso-install-item\"\u003e\n        \u003cstrong\u003e💨 Ducting \u0026amp; Ventilation\u003c\/strong\u003e\n        Accepts 150mm, 160mm or 200mm round ducting. Flexi duct must be insulated to min. 0.625 m²K\/W to prevent condensation. Total duct pressure drop (supply + extract) must be calculated by the installer. OSO recommends Verplas Thermal Ductwork or equivalent.\n      \u003c\/div\u003e\n      \u003cdiv class=\"oso-install-item\"\u003e\n        \u003cstrong\u003e🚰 Safety Valve \u0026amp; Discharge\u003c\/strong\u003e\n        6 bar safety valve and ½\" T\u0026amp;P relief valve are supplied. A compliant discharge pipe must be routed to a safe, visible and accessible termination point per Water Regulations and the installation manual.\n      \u003c\/div\u003e\n      \u003cdiv class=\"oso-install-item\"\u003e\n        \u003cstrong\u003e💧 Condensate Drain\u003c\/strong\u003e\n        The heat pump produces condensate during operation. A condensate drain fitting is supplied — route to a suitable drain. The air outlet temperature is approximately 5–10°C below inlet; exhaust must be ducted outside to prevent room temperature drop.\n      \u003c\/div\u003e\n      \u003cdiv class=\"oso-install-item\"\u003e\n        \u003cstrong\u003e🔩 Floor Loading \u0026amp; Clearances\u003c\/strong\u003e\n        Install on a flat, level surface using the supplied anti-vibration feet. Filled weight is 280 kg — confirm structural suitability before installation. Allow sufficient access clearances for maintenance per the installation manual.\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cp style=\"margin-top:0.9rem;margin-bottom:0!important;font-size:15px!important;color:#666\"\u003eFor full installation instructions, please refer to the manufacturer's installation manual supplied with the unit.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":63226831077725,"sku":"11012314","price":2970.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OSOHotwaterAquaSustainDHP200LitreIntegratedHeatPumpCylinder.webp?v=1769615781"},{"product_id":"oso-150l-unvented-direct-hot-water-cylinder-pre-plumbed","title":"OSO Super Xpress VIP 150L Unvented Direct Hot Water Cylinder Pre-Plumbed","description":"\u003cdiv style=\"font-family:Arial,sans-serif;font-size:16px;color:#222;max-width:900px;margin:0 auto;line-height:1.6;\"\u003e\n\n  \u003cp\u003eThe \u003cstrong\u003eOSO Super Xpress VIP SX150\u003c\/strong\u003e is a \u003cstrong\u003e150-litre direct electric unvented hot water cylinder\u003c\/strong\u003e with a unique \u003cstrong\u003epre-plumbed, pre-wired patented design\u003c\/strong\u003e that conceals all pipework, expansion vessels, valves, and cables under a clean top lid. It is the only direct cylinder with all connections on top — reducing installation time by up to \u003cstrong\u003e70%\u003c\/strong\u003e compared to conventional cylinders. \u003cstrong\u003eVacuum Insulation Panel (VIP) technology\u003c\/strong\u003e gives the SX the \u003cstrong\u003elowest SAP score of any direct electric cylinder\u003c\/strong\u003e, while the twin 3kW INCOTEC immersion heaters provide dual-tariff electric flexibility and deliver up to \u003cstrong\u003e20% more usable hot water\u003c\/strong\u003e than comparable cylinders of the same volume.\u003c\/p\u003e\n\n  \u003cdiv style=\"display:flex;flex-wrap:wrap;gap:12px;margin:24px 0;\"\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e150L\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eStorage Volume\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e+20%\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eMore Hot Water\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e70%\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eLabour Saving\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e3+3kW\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eTwin Immersions\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:8px;padding:16px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e25 yr\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eTank Warranty\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#e6f4f3;border-left:4px solid #008377CF;border-radius:6px;padding:16px 20px;margin:20px 0;\"\u003e\n    \u003cstrong style=\"color:#005c54;\"\u003eLowest SAP Score of Any Direct Cylinder\u003c\/strong\u003e\u003cbr\u003e\n    The OSO Super Xpress VIP achieves the \u003cstrong\u003elowest SAP energy score of any direct electric cylinder\u003c\/strong\u003e — a key benefit for housebuilders and developers under Part L of the Building Regulations. The combination of VIP insulation and the ability to downsize the cylinder (due to 20% more usable capacity) further reduces both heat loss and material cost.\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px;margin:28px 0 14px;font-size:17px;font-weight:700;\"\u003eKey Features\u003c\/div\u003e\n  \u003cdiv style=\"display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;margin-bottom:28px;\"\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e🌡️ VIP Vacuum Insulation Panels\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eOSO's award-winning \u003cstrong\u003eVacuum Insulation Panels\u003c\/strong\u003e give the SX150 a standing heat loss of just \u003cstrong\u003e47W \/ 1.13 kWh per day\u003c\/strong\u003e — far below any conventional foam-insulated direct cylinder of the same size. This directly reduces running costs and SAP score.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e💧 20% More Usable Hot Water\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe SX150 delivers \u003cstrong\u003e254 litres of hot water at 40°C delivery temperature\u003c\/strong\u003e (via the blending valve) — approximately 20% more than competitors' 150L cylinders. This allows the use of a smaller cylinder, saving on purchase cost, space, and heat loss simultaneously.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e🔧 All-Top Pre-Plumbed Design\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eEvery connection — cold water in, hot water out, both immersion feeds, the mixing valve, T\u0026amp;P valve, and both expansion vessels — is \u003cstrong\u003efactory-assembled on top of the cylinder\u003c\/strong\u003e. A fitting template is supplied to speed up pipework preparation. Installers report up to 70% time savings over conventional designs.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e⚡ Dual Tariff INCOTEC Immersions\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003e\u003cstrong\u003eTwin 3kW INCOTEC immersion heaters\u003c\/strong\u003e (upper + lower) enable dual tariff operation — the lower element heats the full tank on cheaper off-peak rates, while the upper element provides a rapid top-up boost at any time. Both are compatible with \u003cstrong\u003esolar PV diverters and smart tariff systems\u003c\/strong\u003e.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e📦 Integral Dual Expansion Vessels\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eTwo \u003cstrong\u003e6L expansion vessels are factory-fitted\u003c\/strong\u003e inside the top lid — no separate vessel to mount on the wall or pipe in. The flow-through expansion valve minimises pipework to the vessels in accordance with Building Regulations approval, keeping the installation compact.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e🔒 ULTRAWELD Stainless Construction\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe \u003cstrong\u003e1.3mm stainless steel inner vessel\u003c\/strong\u003e is built to OSO's ULTRAWELD standard — superior weld quality for long-term corrosion resistance in all UK water conditions. Backed by a class-leading \u003cstrong\u003e25-year tank warranty\u003c\/strong\u003e.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e🧺 Washing Machine Footprint Compatible\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe SX150 can \u003cstrong\u003eshare a footprint with a washing machine\u003c\/strong\u003e using the optional OSO washing machine frame — a significant space advantage in small utility rooms or kitchen installations where every centimetre counts.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:6px;\"\u003e📊 Part L \u0026amp; SAP Compliance\u003c\/div\u003e\n      \u003cp style=\"margin:0;font-size:15px;\"\u003eThe SX VIP achieves the \u003cstrong\u003elowest SAP score of any direct cylinder\u003c\/strong\u003e — a key advantage for housebuilders and developers seeking Building Regulations compliance under Part L. Downsizing the cylinder (enabled by the 20% capacity advantage) further improves the SAP figure.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#fff5f5;border-left:4px solid #c0392b;border-radius:6px;padding:16px 20px;margin:20px 0;\"\u003e\n    \u003cstrong style=\"color:#c0392b;\"\u003e⚠️ G3 Unvented Installation Required\u003c\/strong\u003e\u003cbr\u003e\n    Must be installed by a \u003cstrong\u003eG3 registered competent engineer\u003c\/strong\u003e. All work must comply with Building Regulation G3 and Water Regulations. Ensure a minimum \u003cstrong\u003e6mm² twin \u0026amp; earth cable\u003c\/strong\u003e is provided for each immersion heater circuit. Do not operate the cylinder empty — fill with water before switching on.\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px;margin:28px 0 14px;font-size:17px;font-weight:700;\"\u003eTechnical Specifications — SX 150 VIP\u003c\/div\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;font-size:15px;\"\u003e\n    \u003ctr style=\"background:#005c54;color:#fff;\"\u003e\n      \u003cth style=\"padding:10px 12px;text-align:left;\"\u003eSpecification\u003c\/th\u003e\n      \u003cth style=\"padding:10px 12px;text-align:left;\"\u003eValue\u003c\/th\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eProduct No.\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003eOSO 10 802 662 (SX 150 VIP)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eStorage Volume\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e143 litres\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eCapacity @ 40°C\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e254 litres\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eDiameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e580 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eHeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e1,050 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eWeight Empty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e31 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eWeight Full\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e174 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eImmersion Heaters\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e3kW upper + 3kW lower INCOTEC \/ 1 × 240V each\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eThermostat Set Point\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e70°C (adjustable 40–70°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eStanding Heat Loss\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e47W \/ 1.13 kWh\/day (EN 12897)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eErP Energy Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003eD\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eHeat-up Time ΔT 55°C (upper element)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e174 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eRecovery Time 70% (upper element)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e52 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eExpansion Vessels\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e2 × 6L factory-fitted\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eT\u0026amp;P Relief Valve\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e10 bar \/ 90–95°C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003eMixing Valve Set Point\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border-bottom:1px solid #c8e6e3;\"\u003ePreset 60°C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eTank Warranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e25 years (stainless steel inner vessel)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\n  \u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px;margin:32px 0 14px;font-size:17px;font-weight:700;\"\u003eFrequently Asked Questions\u003c\/div\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eWhy does the SX150 deliver 254 litres of hot water from a 143-litre tank?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eThe SX stores water at a high temperature (up to 70°C) and the built-in \u003cstrong\u003eblending valve mixes it with cold water\u003c\/strong\u003e to deliver at approximately 40°C — the typical shower temperature. Because the stored water is hotter than the delivered temperature, mixing produces more total volume. OSO's design specifically maximises this ratio, giving around \u003cstrong\u003e20% more usable water than competitors' cylinders of the same nominal size\u003c\/strong\u003e.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eIs the SX150 compatible with a heat pump?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eThe SX150 is a \u003cstrong\u003edirect electric cylinder\u003c\/strong\u003e and is not designed as a primary heat pump cylinder. For heat pump installations, OSO recommends the \u003cstrong\u003eDelta GeoCoil DGC\u003c\/strong\u003e range, which features a large tube heat exchanger optimised for low-temperature heat pump operation. The SX immersion can serve as electric backup in a hybrid system, but it should not be the primary heat source.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eCan I use the SX150 with an Economy 7 or off-peak electricity tariff?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eYes — the twin immersion heater configuration is ideal for \u003cstrong\u003edual tariff (Economy 7\/10) operation\u003c\/strong\u003e. The lower immersion heats the full tank overnight on cheaper off-peak electricity, while the upper element provides a top-up boost during peak hours when needed. This is a cost-effective way to reduce electricity bills for all-electric properties.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eCan I connect a solar PV diverter to the SX150?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eYes. Either immersion heater can be connected to a \u003cstrong\u003esolar PV diverter\u003c\/strong\u003e (e.g. myenergi Eddi, Solic 200, iBoost) — diverting surplus generation into free hot water. The upper immersion is typically used for solar diversion as it heats the top of the tank most quickly, providing usable hot water with minimal delay.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF;color:#fff;padding:13px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eDoes the SX150 need to be near a drain for the discharge pipe?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eYes. As an \u003cstrong\u003eunvented cylinder\u003c\/strong\u003e, the SX150 requires a T\u0026amp;P relief valve discharge pipe (tundish) that discharges safely to an appropriate drain or external location in accordance with G3 Building Regulations. The tundish is included in the integrated G3 kit under the top lid. The discharge must be visible and routed correctly — your G3 engineer will arrange this during installation.\u003c\/div\u003e\n  \u003c\/details\u003e\n\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":63264205013341,"sku":"11011686","price":990.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OsoSagaXpress150LUnventedDirectHotWaterCylinderPre-Plumbed.jpg?v=1770020582"},{"product_id":"oso-aquasustain-260-integrated-heat-pump-cylinder-r290-260l-exhaust-air-mev-dhw-heat-pump","title":"OSO AquaSustain 260 Integrated Heat Pump Cylinder R290 | 260L | Exhaust Air MEV DHW Heat Pump","description":"\u003cstyle\u003e\n ── Reset ── ,\n.qh-pd, .qh-pd *::before, .qh-pd *::after { box-sizing: border-box; margin: 0; padding: 0; }\n.qh-pd { font-family: inherit; font-size: 16px; line-height: 1.65; color: #1a1a1a; }\n\n ── Brand tokens ── ,\n Primary #008377 | Dark #005f55 | Light bg #e6f4f3 | Amber #f4a921 | Warn-orange #e65100 | Info-blue #1565c0 ,\n\n ── Badges ── ,\n.qh-pd .badge-row { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 1.25rem; }\n.qh-pd .badge { display: inline-block; font-size: 11px; font-weight: 700; border-radius: 4px;\n  padding: 3px 10px; letter-spacing: 0.05em; text-transform: uppercase; }\n.qh-pd .b-teal   { background: #008377; color: #fff; }\n.qh-pd .b-dark   { background: #005f55; color: #fff; }\n.qh-pd .b-amber  { background: #f4a921; color: #1a1a1a; }\n.qh-pd .b-grey   { background: #555;    color: #fff; }\n.qh-pd .b-blue   { background: #1565c0; color: #fff; }\n.qh-pd .b-outline { background: transparent; color: #008377; border: 1.5px solid #008377; }\n\n ── Section label ── ,\n.qh-pd .section-label {\n  font-size: 10.5px; font-weight: 800; letter-spacing: 0.14em; text-transform: uppercase;\n  color: #008377; margin-bottom: 0.55rem; margin-top: 1.7rem;\n  padding-bottom: 4px; border-bottom: 2px solid #008377; }\n\n ── Intro text ── ,\n.qh-pd .prod-desc { font-size: 15.5px; color: #2a2a2a; margin-bottom: 1.4rem; line-height: 1.8; }\n\n ── Feature list ── ,\n.qh-pd .feat-list { list-style: none; margin-bottom: 1.4rem; padding: 0; }\n.qh-pd .feat-list li { padding: 4px 0 4px 22px; position: relative; font-size: 15px; }\n.qh-pd .feat-list li::before { content: \"✓\"; position: absolute; left: 0;\n  color: #008377; font-weight: 800; font-size: 15px; }\n\n ── Variant spec table ── ,\n.qh-pd .table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; margin-bottom: 1.5rem; }\n.qh-pd .spec-table { width: 100%; border-collapse: collapse; font-size: 13.5px; min-width: 520px; }\n.qh-pd .spec-table th, .qh-pd .spec-table td { padding: 7px 11px; border-bottom: 1px solid #d4eeeb; vertical-align: top; word-break: break-word; }\n.qh-pd .spec-table thead th { background: #005f55; color: #fff; font-weight: 700; text-align: left; white-space: nowrap; }\n.qh-pd .spec-table thead th:first-child { min-width: 200px; }\n.qh-pd .spec-table tbody tr:nth-child(even) td { background: #e6f4f3; }\n.qh-pd .spec-table tbody tr:nth-child(odd)  td { background: #fff; }\n.qh-pd .spec-table tbody td:first-child { font-weight: 600; color: #005f55; }\n.qh-pd .sku { font-family: 'Courier New', monospace; font-size: 12px; background: #e6f4f3;\n  color: #005f55; padding: 2px 6px; border-radius: 3px; font-weight: 700; }\n\n ── Callouts ── ,\n.qh-pd .callout { padding: 0.85rem 1.15rem; border-radius: 0 6px 6px 0; margin: 0.9rem 0;\n  font-size: 14.5px; line-height: 1.7; }\n.qh-pd .callout-teal  { background: #e6f4f3; border-left: 4px solid #008377; color: #00443d; }\n.qh-pd .callout-amber { background: #fef8ec; border-left: 4px solid #f4a921; color: #4a3000; }\n.qh-pd .callout-warn  { background: #fff3e0; border-left: 4px solid #e65100; color: #4a1800; }\n.qh-pd .callout-blue  { background: #e8f4fd; border-left: 4px solid #1565c0; color: #0a2a50; }\n\n ── Steps (flexbox — Shopify safe) ── ,\n.qh-pd .steps { list-style: none; padding: 0; margin-bottom: 1.4rem; counter-reset: step; }\n.qh-pd .steps li { counter-increment: step; display: flex; align-items: flex-start; gap: 0.85rem;\n  padding: 0.75rem; border-radius: 6px; margin-bottom: 0.5rem;\n  font-size: 14.5px; line-height: 1.7; background: #fff; border: 1px solid #d4eeeb; }\n.qh-pd .steps li::before { content: counter(step);\n  display: flex; align-items: center; justify-content: center;\n  flex: 0 0 28px; width: 28px; height: 28px; min-width: 28px; border-radius: 50%;\n  background: #008377; color: #fff; font-size: 13px; font-weight: 800; line-height: 1; margin-top: 3px; }\n.qh-pd .steps li strong { color: #005f55; }\n\n ── FAQ ── ,\n.qh-pd .faq-item { border-bottom: 1px solid #d4eeeb; padding: 0.85rem 0; }\n.qh-pd .faq-item:last-child { border-bottom: none; }\n.qh-pd .faq-q { font-size: 14.5px; font-weight: 700; color: #005f55;\n  padding-left: 1.4rem; position: relative; }\n.qh-pd .faq-q::before { content: \"Q\"; position: absolute; left: 0; color: #008377; font-weight: 900; }\n.qh-pd .faq-a { font-size: 14px; color: #2a2a2a; margin-top: 0.4rem; padding-left: 1.4rem; line-height: 1.7; }\n\n ── Box grid (what's included) ── ,\n.qh-pd .box-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));\n  gap: 0.6rem; margin-bottom: 1.4rem; }\n.qh-pd .box-item { background: #e6f4f3; border: 1px solid #b2dcd8; border-radius: 6px;\n  padding: 0.6rem 0.75rem; font-size: 13.5px; color: #00443d;\n  display: flex; align-items: flex-start; gap: 0.4rem; }\n.qh-pd .box-item::before { content: \"✔\"; color: #008377; font-weight: 900; flex-shrink: 0; margin-top: 1px; }\n\n ── Dark strip ── ,\n.qh-pd .dark-strip { background: #005f55; color: #fff; border-radius: 6px;\n  padding: 0.8rem 1.1rem; font-size: 14px; margin-bottom: 1.4rem; line-height: 1.7; }\n.qh-pd .dark-strip strong { color: #7fe8df; }\n\n ── Advantage pills ── ,\n.qh-pd .adv-grid { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.4rem; }\n.qh-pd .adv-pill { background: #005f55; color: #fff; border-radius: 20px;\n  padding: 5px 14px; font-size: 13px; font-weight: 700; }\n\u003c\/style\u003e\n\n\u003cdiv class=\"qh-pd\"\u003e\n\u003cdiv class=\"badge-row\"\u003e\n\u003cspan class=\"badge b-teal\"\u003eIntegrated Heat Pump Cylinder\u003c\/span\u003e\u003cspan class=\"badge b-dark\"\u003eR290 Refrigerant – GWP 3\u003c\/span\u003e\u003cspan class=\"badge b-amber\"\u003e260 Litres\u003c\/span\u003e\u003cspan class=\"badge b-teal\"\u003eCoP up to 3.55\u003c\/span\u003e\u003cspan class=\"badge b-dark\"\u003eEnergy Rating A+\u003c\/span\u003e\u003cspan class=\"badge b-grey\"\u003eExhaust Air \/ MEV\u003c\/span\u003e\u003cspan class=\"badge b-outline\"\u003eStainless Steel\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp class=\"prod-desc\"\u003eThe OSO AquaSustain 260 (DHP) is a fully integrated domestic hot water heat pump cylinder designed for properties where underfloor mechanical extract ventilation (MEV) is installed, or where external air can be ducted in and out. The heat pump unit sits in the upper section of the cylinder and extracts thermal energy from the incoming air stream, concentrating it to heat the 260-litre stainless steel storage vessel in the lower section. Using R290 (propane) refrigerant — with a Global Warming Potential of just 3 and zero Ozone Depletion Potential — the AquaSustain achieves a Coefficient of Performance of up to 3.55 in warm climates and 3.24 in average conditions, meaning it delivers up to 3.55 kWh of heat for every 1 kWh of electricity consumed. The cylinder reaches up to 60°C on heat pump power alone, with a 1.5 kW auxiliary immersion for boost or backup. A complete G3 Building Regulations kit (24L expansion vessel, inlet control valve, tundish) is supplied factory-fitted, simplifying compliance and reducing installation time.\u003c\/p\u003e\n\u003cdiv class=\"section-label\"\u003eKey Features\u003c\/div\u003e\n\u003cul class=\"feat-list\"\u003e\n\u003cli\u003eIntegrated single-footprint design — heat pump and cylinder in one unit, no separate plant room required\u003c\/li\u003e\n\u003cli\u003eR290 (propane) refrigerant: GWP of 3, Ozone Depletion Potential of 0 — future-proof low-carbon solution\u003c\/li\u003e\n\u003cli\u003eCoP up to 3.55 (warm climate) \/ 3.24 (average climate) — delivers over 3× the energy input as useful heat\u003c\/li\u003e\n\u003cli\u003eHeats to 60°C on heat pump alone — no need to use backup immersion for pasteurisation\u003c\/li\u003e\n\u003cli\u003eA+ energy rating — ideal for Building Regulations Part L compliance and SAP calculations\u003c\/li\u003e\n\u003cli\u003eNCM (SAP) identifier 108964 — listed on government energy database\u003c\/li\u003e\n\u003cli\u003e1.5 kW auxiliary immersion heater for backup and boost operation (max 70°C with element)\u003c\/li\u003e\n\u003cli\u003eComplete G3 kit factory-fitted: 24L expansion vessel, inlet control valve, tundish\u003c\/li\u003e\n\u003cli\u003eStainless steel cylinder with ULTRAWELD construction — 5-year manufacturer's warranty\u003c\/li\u003e\n\u003cli\u003eINCOTEC immersion heater — high durability in hard water areas\u003c\/li\u003e\n\u003cli\u003eDesigned to work with MEV (Mechanical Extract Ventilation) systems — draws stale warm air from kitchen\/bathroom\u003c\/li\u003e\n\u003cli\u003eCan also connect to external air supply via 150–200mm duct connections\u003c\/li\u003e\n\u003cli\u003eFully insulated cylinder body to minimise standing heat loss\u003c\/li\u003e\n\u003cli\u003eSuitable for domestic properties in both new build and retrofit installations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"section-label\"\u003eOSO Technology Advantages\u003c\/div\u003e\n\u003cdiv class=\"adv-grid\"\u003e\n\u003cspan class=\"adv-pill\"\u003eULTRAWELD — Superior Corrosion Resistance\u003c\/span\u003e\u003cspan class=\"adv-pill\"\u003eINCOTEC — Hard Water Durability\u003c\/span\u003e\u003cspan class=\"adv-pill\"\u003eR290 — Ultra-Low GWP Refrigerant\u003c\/span\u003e\u003cspan class=\"adv-pill\"\u003eECO Insulation\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"section-label\"\u003eWhat's Included\u003c\/div\u003e\n\u003cdiv class=\"box-grid\"\u003e\n\u003cdiv class=\"box-item\"\u003eAquaSustain 260 cylinder with integrated heat pump\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003e1.5 kW INCOTEC auxiliary immersion heater\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eP\u0026amp;T safety valve (10 bar \/ 90–95°C)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003e24L expansion vessel (factory-fitted)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eInlet control valve (strainer, PRV, expansion relief)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eTundish\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eAir duct connection fittings (150–160–200mm)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eInstallation manual\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"section-label\"\u003eTechnical Specifications\u003c\/div\u003e\n\u003cdiv class=\"table-scroll\"\u003e\u003ctable class=\"spec-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eUnit\u003c\/th\u003e\n\u003cth\u003eAquaSustain 260\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Number\u003c\/td\u003e\n\u003ctd\u003eOSO\u003c\/td\u003e\n\u003ctd\u003e11012315\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Name\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eAquaSustain 260 DHP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCylinder Volume\u003c\/td\u003e\n\u003ctd\u003eL\u003c\/td\u003e\n\u003ctd\u003e260\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (H × Ø)\u003c\/td\u003e\n\u003ctd\u003emm\u003c\/td\u003e\n\u003ctd\u003e1907 × 584\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverall Depth\u003c\/td\u003e\n\u003ctd\u003emm\u003c\/td\u003e\n\u003ctd\u003e624\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight (empty)\u003c\/td\u003e\n\u003ctd\u003ekg\u003c\/td\u003e\n\u003ctd\u003e92\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight (full)\u003c\/td\u003e\n\u003ctd\u003ekg\u003c\/td\u003e\n\u003ctd\u003e352\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackage Weight\u003c\/td\u003e\n\u003ctd\u003ekg\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat Loss (EN 12897)\u003c\/td\u003e\n\u003ctd\u003eW\u003c\/td\u003e\n\u003ctd\u003e73\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat Loss \/ 24 hrs\u003c\/td\u003e\n\u003ctd\u003ekWh\/day\u003c\/td\u003e\n\u003ctd\u003e1.90\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnnual Energy Consumption (avg climate)\u003c\/td\u003e\n\u003ctd\u003ekWh\/year\u003c\/td\u003e\n\u003ctd\u003e1,255\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnnual Energy Consumption (cold climate)\u003c\/td\u003e\n\u003ctd\u003ekWh\/year\u003c\/td\u003e\n\u003ctd\u003e1,576\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnnual Energy Consumption (warm climate)\u003c\/td\u003e\n\u003ctd\u003ekWh\/year\u003c\/td\u003e\n\u003ctd\u003e1,143\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnergy Rating\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eA+\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTapping Profile\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eXL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCOP — Average Climate\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e3.24\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCOP — Warm Climate\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e3.55\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater Heating Efficiency (avg climate)\u003c\/td\u003e\n\u003ctd\u003e%\u003c\/td\u003e\n\u003ctd\u003e142\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater Heating Efficiency (warm climate)\u003c\/td\u003e\n\u003ctd\u003e%\u003c\/td\u003e\n\u003ctd\u003e147\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax DHW Temperature (HP)\u003c\/td\u003e\n\u003ctd\u003e°C\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax DHW Temperature (with immersion)\u003c\/td\u003e\n\u003ctd\u003e°C\u003c\/td\u003e\n\u003ctd\u003e70\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThermostat Setpoint (default)\u003c\/td\u003e\n\u003ctd\u003e°C\u003c\/td\u003e\n\u003ctd\u003e55 (ECO) \/ 60 (AUTO)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAmbient Temperature Range\u003c\/td\u003e\n\u003ctd\u003e°C\u003c\/td\u003e\n\u003ctd\u003e−10 to +40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRefrigerant \/ Charge\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eR290 \/ 150 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRefrigerant GWP\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat Pump Power Input Range\u003c\/td\u003e\n\u003ctd\u003eW\u003c\/td\u003e\n\u003ctd\u003e405–500\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeating Power Range\u003c\/td\u003e\n\u003ctd\u003eW\u003c\/td\u003e\n\u003ctd\u003e1,005–1,750\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAuxiliary Immersion Power\u003c\/td\u003e\n\u003ctd\u003eW\u003c\/td\u003e\n\u003ctd\u003e1,500\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Power Consumption (HP + element)\u003c\/td\u003e\n\u003ctd\u003eW\u003c\/td\u003e\n\u003ctd\u003e2,000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSound Power Level\u003c\/td\u003e\n\u003ctd\u003edB(A)\u003c\/td\u003e\n\u003ctd\u003e53\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSound Pressure at 2m (high speed)\u003c\/td\u003e\n\u003ctd\u003edB(A)\u003c\/td\u003e\n\u003ctd\u003e45.9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSound Pressure at 2m (low speed)\u003c\/td\u003e\n\u003ctd\u003edB(A)\u003c\/td\u003e\n\u003ctd\u003e41\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMin Air Flow (external supply)\u003c\/td\u003e\n\u003ctd\u003em³\/h\u003c\/td\u003e\n\u003ctd\u003e215\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMin Air Flow (internal\/MEV supply)\u003c\/td\u003e\n\u003ctd\u003em³\/h\u003c\/td\u003e\n\u003ctd\u003e190\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Air Flow — Low Speed\u003c\/td\u003e\n\u003ctd\u003em³\/h\u003c\/td\u003e\n\u003ctd\u003e370\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Air Flow — High Speed\u003c\/td\u003e\n\u003ctd\u003em³\/h\u003c\/td\u003e\n\u003ctd\u003e438\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStatic Pressure (low speed, external)\u003c\/td\u003e\n\u003ctd\u003ePa\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStatic Pressure (high speed, external)\u003c\/td\u003e\n\u003ctd\u003ePa\u003c\/td\u003e\n\u003ctd\u003e220\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDuct Connection Diameter\u003c\/td\u003e\n\u003ctd\u003emm\u003c\/td\u003e\n\u003ctd\u003e150 \/ 160 \/ 200\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElectrical Supply\u003c\/td\u003e\n\u003ctd\u003eV\/Ph\/Hz\u003c\/td\u003e\n\u003ctd\u003e230 \/ 1 \/ 50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater Connections (in\/out\/recirc)\u003c\/td\u003e\n\u003ctd\u003einch BSP\u003c\/td\u003e\n\u003ctd\u003e¾\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSafety Valve Connection\u003c\/td\u003e\n\u003ctd\u003einch BSP\u003c\/td\u003e\n\u003ctd\u003e½\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Operating Pressure\u003c\/td\u003e\n\u003ctd\u003ebar\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNCM (SAP) Identifier\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e108964\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExpansion Vessel (supplied)\u003c\/td\u003e\n\u003ctd\u003eL\u003c\/td\u003e\n\u003ctd\u003e24\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCylinder Warranty\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e5 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cdiv class=\"callout callout-warn\"\u003e⚠️ \u003cstrong\u003eF-Gas \u0026amp; Refrigerant:\u003c\/strong\u003e The AquaSustain contains 150 g of R290 refrigerant (propane). Servicing or refrigerant handling must only be carried out by qualified F-Gas certified technicians. The unit is sealed and cannot be recharged in the field by the user.\u003c\/div\u003e\n\u003cdiv class=\"callout callout-blue\"\u003eℹ️ \u003cstrong\u003eMEV Integration:\u003c\/strong\u003e The AquaSustain is classified as an Exhaust Air heat pump. In a property with MEV (Mechanical Extract Ventilation), the heat pump draws warm, stale air from kitchens and bathrooms, extracts its heat energy, and discharges cooler air outside — combining hot water production with whole-house ventilation energy recovery.\u003c\/div\u003e\n\u003cdiv class=\"section-label\"\u003eInstallation Overview\u003c\/div\u003e\n\u003cdiv class=\"callout callout-warn\"\u003e⚠️ \u003cstrong\u003eQualified installer required:\u003c\/strong\u003e Installation must be carried out by a qualified unvented hot water installer holding a current G3 qualification (or equivalent). Electrical connections must comply with BS 7671. Refrigerant circuit must not be altered by non-F-Gas-certified personnel.\u003c\/div\u003e\n\u003col class=\"steps\"\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eSurvey and siting:\u003c\/strong\u003e Confirm the installation location can accommodate the unit dimensions (1907 × 584 × 624mm). Allow a minimum of 400mm clearance above the unit. The floor must be capable of supporting the full weight (352 kg when full of water).\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eDuctwork design:\u003c\/strong\u003e Calculate total pressure drop for supply and extract ductwork. OSO recommends insulated ductwork (min. 0.625 m²K\/W). Include all components — flexible connections, anti-insect grids — in pressure drop calculations. Connect using 150mm, 160mm, or 200mm duct adapters.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eCold water supply connection:\u003c\/strong\u003e Connect the mains cold water supply to the inlet control valve (supplied). Ensure supply pressure is within system limits. The G3 kit components (strainer, PRV, expansion relief, tundish) are factory-fitted.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eHot water outlet connection:\u003c\/strong\u003e Connect the hot water outlet to the distribution pipework. Add a mixing valve if required to limit draw-off temperature.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eElectrical connection:\u003c\/strong\u003e Wire the unit to a dedicated 230V \/ 13A fused spur. Do not share with other high-load appliances. Connect the immersion heater thermostat wiring as per the wiring diagram in the installation manual.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eFill and commission:\u003c\/strong\u003e Fill the cylinder with cold water and check all connections for leaks. Bleed any air from the cylinder. Power up the unit and set the operating mode (ECO for heat pump only, AUTO for heat pump + immersion). Allow up to 8 hours for initial heat-up from cold.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eHandover:\u003c\/strong\u003e Advise the homeowner not to switch the unit off completely during normal use. The unit manages its own temperature automatically. Provide all documentation including the installation guide and G3 compliance record.\u003c\/div\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cdiv class=\"callout callout-amber\"\u003e💡 \u003cstrong\u003eOperating note:\u003c\/strong\u003e The AquaSustain is designed to trickle-heat water slowly over several hours, not to deliver rapid heat-up. Initial heat-up from cold can take up to 8 hours. The unit should remain energised at all times unless the property is empty for more than 24 hours. It manages its own thermostat automatically.\u003c\/div\u003e\n\u003cdiv class=\"section-label\"\u003eFrequently Asked Questions\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eWhat is a heat pump cylinder and how does it differ from a standard electric cylinder?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eA standard direct electric cylinder uses an immersion heater to heat water — consuming 1 kWh of electricity to produce 1 kWh of heat. The AquaSustain uses an air-source heat pump to extract heat from air and concentrate it into the water. For every 1 kWh of electricity used, the AquaSustain produces up to 3.55 kWh of useful heat — dramatically reducing running costs and carbon emissions.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eDoes the AquaSustain 260 need an MEV (Mechanical Extract Ventilation) system?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eNot necessarily, but it is specifically classified as an Exhaust Air heat pump for MEV installations, where it doubles as a ventilation energy recovery unit. It can also operate by ducting external air directly in and out of the building. Your installer will assess which configuration suits your property.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eCan the AquaSustain heat water to 60°C using the heat pump alone?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eYes. The AquaSustain can reach 60°C on heat pump power alone — sufficient for Legionella prevention without needing the auxiliary immersion heater. The 1.5 kW immersion extends the maximum to 70°C for supplementary use.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eWhat is R290 and why is it used?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eR290 is propane, a natural refrigerant with a Global Warming Potential of just 3 (compared to 675+ for R134a or over 2,000 for R410A). It has zero Ozone Depletion Potential. OSO uses R290 to ensure the AquaSustain is as environmentally responsible as possible and future-proof against F-Gas phase-down regulations.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eHow long does it take to heat a full cylinder from cold?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eIn ECO mode (heat pump only), the 260L cylinder takes approximately 517 minutes (around 8–9 hours) to heat from cold. This is by design — the unit trickle-heats over an extended period rather than delivering rapid heat-up. It should remain switched on at all times during normal occupancy.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eWhat is the NCM \/ SAP identifier for the AquaSustain 260?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eThe SAP identifier for the AquaSustain 260 is 108964. This can be used in SAP energy calculations for new build and retrofit projects requiring Part L compliance documentation.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eWhat duct sizes does the AquaSustain connect to?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eThe AquaSustain accepts 150mm, 160mm, or 200mm duct connections for both air intake and air discharge. OSO recommends thermally insulated ductwork (minimum 0.625 m²K\/W) to prevent condensation. All duct runs must be included in pressure drop calculations before installation.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eWhat warranty comes with the AquaSustain 260?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eThe stainless steel cylinder carries a 5-year manufacturer's warranty covering defects in materials and manufacture. Electrical components and valve gear carry a 2-year warranty. Warranty conditions apply — refer to OSO's warranty documentation.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eCan I connect the AquaSustain to a solar PV system?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eThe auxiliary immersion heater can be controlled externally and is compatible with solar diverter devices. This allows excess solar generation to be used to heat water via the immersion, maximising self-consumption. The heat pump compressor itself operates from grid or PV power independently.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eIs the AquaSustain suitable for retrofit installations?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eYes. Provided sufficient space is available (the 260L unit is 1,907mm tall), it can be installed in existing properties. The unit requires a 230V single-phase supply and ductwork for air supply and exhaust. Your installer will assess duct routing and structural suitability before installation.\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":63639848616285,"sku":"11012315","price":3200.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OSOHotwaterAquaSustainDHP200LitreIntegratedHeatPumpCylinder.webp?v=1769615781"},{"product_id":"oso-s-charge-150-s2s-supercharged-smart-direct-unvented-cylinder-150l-11014146-esa-time-of-use-tariff","title":"OSO Saga Charge 150 S2S Supercharged Smart Direct Unvented Cylinder | 150L | ESA Time-of-Use Tariff","description":"\u003cstyle\u003e\n ── Reset ── ,\n.qh-pd, .qh-pd *::before, .qh-pd *::after { box-sizing: border-box; margin: 0; padding: 0; }\n.qh-pd { font-family: inherit; font-size: 16px; line-height: 1.65; color: #1a1a1a; }\n\n ── Brand tokens ── ,\n Primary #008377 | Dark #005f55 | Light bg #e6f4f3 | Amber #f4a921 | Warn-orange #e65100 | Info-blue #1565c0 ,\n\n ── Badges ── ,\n.qh-pd .badge-row { display: flex; 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margin-bottom: 1.4rem; padding: 0; }\n.qh-pd .feat-list li { padding: 4px 0 4px 22px; position: relative; font-size: 15px; }\n.qh-pd .feat-list li::before { content: \"✓\"; position: absolute; left: 0;\n  color: #008377; font-weight: 800; font-size: 15px; }\n\n ── Variant spec table ── ,\n.qh-pd .table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; margin-bottom: 1.5rem; }\n.qh-pd .spec-table { width: 100%; border-collapse: collapse; font-size: 13.5px; min-width: 520px; }\n.qh-pd .spec-table th, .qh-pd .spec-table td { padding: 7px 11px; border-bottom: 1px solid #d4eeeb; vertical-align: top; word-break: break-word; }\n.qh-pd .spec-table thead th { background: #005f55; color: #fff; font-weight: 700; text-align: left; white-space: nowrap; }\n.qh-pd .spec-table thead th:first-child { min-width: 200px; }\n.qh-pd .spec-table tbody tr:nth-child(even) td { background: #e6f4f3; }\n.qh-pd .spec-table tbody tr:nth-child(odd)  td { background: #fff; }\n.qh-pd .spec-table tbody td:first-child { font-weight: 600; color: #005f55; }\n.qh-pd .sku { font-family: 'Courier New', monospace; font-size: 12px; background: #e6f4f3;\n  color: #005f55; padding: 2px 6px; border-radius: 3px; font-weight: 700; }\n\n ── Callouts ── ,\n.qh-pd .callout { padding: 0.85rem 1.15rem; border-radius: 0 6px 6px 0; margin: 0.9rem 0;\n  font-size: 14.5px; line-height: 1.7; }\n.qh-pd .callout-teal  { background: #e6f4f3; border-left: 4px solid #008377; color: #00443d; }\n.qh-pd .callout-amber { background: #fef8ec; border-left: 4px solid #f4a921; color: #4a3000; }\n.qh-pd .callout-warn  { background: #fff3e0; border-left: 4px solid #e65100; color: #4a1800; }\n.qh-pd .callout-blue  { background: #e8f4fd; border-left: 4px solid #1565c0; color: #0a2a50; }\n\n ── Steps (flexbox — Shopify safe) ── ,\n.qh-pd .steps { list-style: none; padding: 0; margin-bottom: 1.4rem; counter-reset: step; }\n.qh-pd .steps li { counter-increment: step; display: flex; align-items: flex-start; gap: 0.85rem;\n  padding: 0.75rem; border-radius: 6px; margin-bottom: 0.5rem;\n  font-size: 14.5px; line-height: 1.7; background: #fff; border: 1px solid #d4eeeb; }\n.qh-pd .steps li::before { content: counter(step);\n  display: flex; align-items: center; justify-content: center;\n  flex: 0 0 28px; width: 28px; height: 28px; min-width: 28px; border-radius: 50%;\n  background: #008377; color: #fff; font-size: 13px; font-weight: 800; line-height: 1; margin-top: 3px; }\n.qh-pd .steps li strong { color: #005f55; }\n\n ── FAQ ── ,\n.qh-pd .faq-item { border-bottom: 1px solid #d4eeeb; padding: 0.85rem 0; }\n.qh-pd .faq-item:last-child { border-bottom: none; }\n.qh-pd .faq-q { font-size: 14.5px; font-weight: 700; color: #005f55;\n  padding-left: 1.4rem; position: relative; }\n.qh-pd .faq-q::before { content: \"Q\"; position: absolute; left: 0; color: #008377; font-weight: 900; }\n.qh-pd .faq-a { font-size: 14px; color: #2a2a2a; margin-top: 0.4rem; padding-left: 1.4rem; line-height: 1.7; }\n\n ── Box grid (what's included) ── ,\n.qh-pd .box-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));\n  gap: 0.6rem; margin-bottom: 1.4rem; }\n.qh-pd .box-item { background: #e6f4f3; border: 1px solid #b2dcd8; border-radius: 6px;\n  padding: 0.6rem 0.75rem; font-size: 13.5px; color: #00443d;\n  display: flex; align-items: flex-start; gap: 0.4rem; }\n.qh-pd .box-item::before { content: \"✔\"; color: #008377; font-weight: 900; flex-shrink: 0; margin-top: 1px; }\n\n ── Dark strip ── ,\n.qh-pd .dark-strip { background: #005f55; color: #fff; border-radius: 6px;\n  padding: 0.8rem 1.1rem; font-size: 14px; margin-bottom: 1.4rem; line-height: 1.7; }\n.qh-pd .dark-strip strong { color: #7fe8df; }\n\n ── Advantage pills ── ,\n.qh-pd .adv-grid { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.4rem; }\n.qh-pd .adv-pill { background: #005f55; color: #fff; border-radius: 20px;\n  padding: 5px 14px; font-size: 13px; font-weight: 700; }\n\u003c\/style\u003e\n\n\u003cdiv class=\"qh-pd\"\u003e\n\u003cdiv class=\"badge-row\"\u003e\n\u003cspan class=\"badge b-teal\"\u003eSmart Energy Appliance (ESA)\u003c\/span\u003e\u003cspan class=\"badge b-dark\"\u003eS2S Supercharged\u003c\/span\u003e\u003cspan class=\"badge b-amber\"\u003e150L Direct Unvented Cylinder\u003c\/span\u003e\u003cspan class=\"badge b-teal\"\u003eTime-of-Use Tariff Ready\u003c\/span\u003e\u003cspan class=\"badge b-blue\"\u003eOSO InCharge App\u003c\/span\u003e\u003cspan class=\"badge b-grey\"\u003e3 kW Titanium Immersion\u003c\/span\u003e\u003cspan class=\"badge b-outline\"\u003e25-Year Cylinder Warranty\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp class=\"prod-desc\"\u003eThe OSO S Charge 150 (internally the S2S 151L) is an Energy Smart Appliance (ESA) — a direct electric unvented hot water cylinder that actively connects to time-of-use electricity tariffs, automatically scheduling its heating to the cheapest available 30-minute pricing windows. It is fully pre-plumbed and wired using OSO's patented S-DESIGN, with all pipework, expansion vessels, and cabling concealed behind a removable lid. Heated by a 3 kW titanium-grade immersion heater (TITANIUM IMMERSION — durable in hard water), the S Charge 150 stores water at 75°C for maximum hot water availability and Legionella compliance. The integrated OSO InCharge system connects to the cloud, reads day-ahead energy prices (e.g. Octopus Agile), and heats during the lowest-cost periods — OSO projects average savings of around £200 per year. Three internal temperature sensors provide precise control. The cylinder is built from stainless steel using ULTRAWELD laser-welded Duplex steel construction, carries a 25-year cylinder warranty, and meets Building Regulations G3 with a factory-fitted G3 kit including integral expansion vessels, PRV, strainer, tundish, and drain cock.\u003c\/p\u003e\n\u003cdiv class=\"section-label\"\u003eKey Features\u003c\/div\u003e\n\u003cul class=\"feat-list\"\u003e\n\u003cli\u003eEnergy Smart Appliance (ESA) — meets UK government smart appliance standards 3 years ahead of mandate\u003c\/li\u003e\n\u003cli\u003eConnects to time-of-use tariffs (e.g. Octopus Agile) — heats during cheapest 30-minute periods automatically\u003c\/li\u003e\n\u003cli\u003eOSO InCharge app: monitor live temperature, available hot water, historical usage, and set holiday mode\u003c\/li\u003e\n\u003cli\u003eMachine learning AI adapts to your daily hot water usage patterns to ensure availability at lowest cost\u003c\/li\u003e\n\u003cli\u003eProjected saving of ~£200\/year by avoiding peak electricity pricing\u003c\/li\u003e\n\u003cli\u003e3 kW TITANIUM IMMERSION heater — superior durability in hard water conditions\u003c\/li\u003e\n\u003cli\u003e75°C thermostat setpoint — maximises effective hot water capacity through temperature stratification\u003c\/li\u003e\n\u003cli\u003eEffective hot water capacity at 40°C: 261L — 150L cylinder delivers significantly more usable hot water than nominal volume\u003c\/li\u003e\n\u003cli\u003eS-DESIGN — all pipework, expansion vessels, cables concealed under lid for a clean, tidy installation\u003c\/li\u003e\n\u003cli\u003eNANOPUR high-grade insulation — excellent standing heat loss performance\u003c\/li\u003e\n\u003cli\u003eULTRAWELD — laser-welded Duplex stainless steel cylinder with 25-year warranty\u003c\/li\u003e\n\u003cli\u003eFully pre-plumbed and wired — up to 70% labour saving vs traditional cylinders\u003c\/li\u003e\n\u003cli\u003eIntegral G3 Building Regulations kit: 2 × 8L expansion vessels (factory-fitted), PRV, strainer, expansion relief, drain cock, tundish\u003c\/li\u003e\n\u003cli\u003eMixing valve preset to 60°C at draw-off point for user safety\u003c\/li\u003e\n\u003cli\u003eXL tapping profile — suitable for family homes with high hot water demand\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"section-label\"\u003eOSO Technology Advantages\u003c\/div\u003e\n\u003cdiv class=\"adv-grid\"\u003e\n\u003cspan class=\"adv-pill\"\u003eS-DESIGN — All Connections Hidden\u003c\/span\u003e\u003cspan class=\"adv-pill\"\u003eNANOPUR — High-Grade Insulation\u003c\/span\u003e\u003cspan class=\"adv-pill\"\u003eULTRAWELD — Superior Corrosion Resistance\u003c\/span\u003e\u003cspan class=\"adv-pill\"\u003eTITANIUM IMMERSION — Hard Water Durability\u003c\/span\u003e\u003cspan class=\"adv-pill\"\u003eTARIFF-READY — Smart ESA\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"section-label\"\u003eWhat's Included\u003c\/div\u003e\n\u003cdiv class=\"box-grid\"\u003e\n\u003cdiv class=\"box-item\"\u003eS Charge 150 (S2S 151L) direct cylinder\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003e3 kW TITANIUM IMMERSION heater (factory-fitted)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eMixing valve — preset 60°C\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eP\u0026amp;T safety valve (10 bar \/ 90–95°C)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003e2 × 8L integral expansion vessels (factory-fitted)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eInlet control valve (strainer + PRV + expansion relief)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eDrain cock\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eTundish\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eFitting template\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eInstallation manual\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"callout callout-blue\"\u003eℹ️ \u003cstrong\u003eSmart Tariff Connectivity:\u003c\/strong\u003e The S Charge 150 is an Energy Smart Appliance certified to work with flexible time-of-use tariffs. It knows energy prices 24 hours in advance and uses AI to learn your household's hot water demand, heating at the lowest-cost periods while always ensuring adequate hot water availability.\u003c\/div\u003e\n\u003cdiv class=\"section-label\"\u003eTechnical Specifications\u003c\/div\u003e\n\u003cdiv class=\"table-scroll\"\u003e\u003ctable class=\"spec-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eUnit\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Number\u003c\/td\u003e\n\u003ctd\u003eOSO\u003c\/td\u003e\n\u003ctd\u003e11014146\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInternal Model Name\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eS2S 151\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Volume\u003c\/td\u003e\n\u003ctd\u003eL\u003c\/td\u003e\n\u003ctd\u003e151\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEffective Capacity at 40°C\u003c\/td\u003e\n\u003ctd\u003eL\u003c\/td\u003e\n\u003ctd\u003e261\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (H × Ø)\u003c\/td\u003e\n\u003ctd\u003emm\u003c\/td\u003e\n\u003ctd\u003e1110 × 595\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight (empty)\u003c\/td\u003e\n\u003ctd\u003ekg\u003c\/td\u003e\n\u003ctd\u003e43\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight (full)\u003c\/td\u003e\n\u003ctd\u003ekg\u003c\/td\u003e\n\u003ctd\u003e191\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThermostat Setpoint\u003c\/td\u003e\n\u003ctd\u003e°C\u003c\/td\u003e\n\u003ctd\u003e75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat Loss (EN 12897)\u003c\/td\u003e\n\u003ctd\u003eW\u003c\/td\u003e\n\u003ctd\u003e48\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat Loss \/ 24 hrs\u003c\/td\u003e\n\u003ctd\u003ekWh\/day\u003c\/td\u003e\n\u003ctd\u003e1.15\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnnual Energy Consumption\u003c\/td\u003e\n\u003ctd\u003ekWh\/year\u003c\/td\u003e\n\u003ctd\u003e4525\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnergy Efficiency\u003c\/td\u003e\n\u003ctd\u003e%\u003c\/td\u003e\n\u003ctd\u003e37\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnergy Rating\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTapping Profile\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eXL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImmersion Power\u003c\/td\u003e\n\u003ctd\u003ekW\u003c\/td\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElectrical Supply\u003c\/td\u003e\n\u003ctd\u003eV\u003c\/td\u003e\n\u003ctd\u003e240 V single-phase\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Operating Pressure\u003c\/td\u003e\n\u003ctd\u003ebar\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExpansion Vessels\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e2 × 8L factory-fitted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMixing Valve Preset\u003c\/td\u003e\n\u003ctd\u003e°C\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eP\u0026amp;T Valve Rating\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e10 bar \/ 90–95°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCylinder Material\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eStainless steel — ULTRAWELD Duplex laser-welded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImmersion Type\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eTITANIUM IMMERSION\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCylinder Warranty\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e25 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cdiv class=\"section-label\"\u003eInstallation Overview\u003c\/div\u003e\n\u003cdiv class=\"callout callout-warn\"\u003e⚠️ \u003cstrong\u003eQualified installer required:\u003c\/strong\u003e This is an unvented hot water cylinder. Installation must be carried out by a qualified installer holding a current G3 Unvented Hot Water Systems certificate (or equivalent). All electrical connections must comply with BS 7671.\u003c\/div\u003e\n\u003col class=\"steps\"\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003ePre-installation check:\u003c\/strong\u003e Confirm the cylinder will fit in the installation location — dimensions are 1110mm (H) × 595mm (Ø). Ensure the floor can support the full loaded weight. Allow 400mm clearance above the unit and 150mm at the rear for pipe connections.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eUse the fitting template:\u003c\/strong\u003e Fix the supplied fitting template to the rear wall. This locates the pre-cut pipe tails in the exact positions required for the S-DESIGN rear connection system. Drill and fix accordingly.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eConnect incoming cold mains:\u003c\/strong\u003e Connect the mains cold water supply to the integrated inlet control valve (strainer, PRV, expansion relief already factory-fitted). Ensure supply pressure is within system limits — install a PRV upstream if mains pressure exceeds 6 bar.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eConnect hot water outlets:\u003c\/strong\u003e Connect the hot water outlet to your distribution pipework. The factory-fitted mixing valve is preset to 60°C — do not alter without re-calculating downstream scalding risks.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eConnect tundish discharge:\u003c\/strong\u003e Connect the tundish outlet to a safe and visible discharge point in accordance with BS 6700 \/ Building Regulations Part G. Use an indirect discharge pipe with the correct air gap.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eElectrical connections:\u003c\/strong\u003e Connect the immersion heater to a dedicated 240V 13A fused connection unit (FCU). The smart ESA connectivity requires a broadband internet connection — follow the OSO InCharge app setup guide to pair the cylinder with your Wi-Fi network and energy tariff.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eFill, commission and test:\u003c\/strong\u003e Fill the cylinder slowly and check all connections for leaks. Open hot water outlets to bleed air. Switch on and allow the cylinder to heat to operating temperature. Confirm the mixing valve is correctly set. Complete the G3 commissioning record and hand it to the customer.\u003c\/div\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cdiv class=\"callout callout-amber\"\u003e💡 \u003cstrong\u003eSmart energy tip:\u003c\/strong\u003e The S Charge 150 works best with a dynamic time-of-use tariff such as Octopus Agile or Octopus Flux. Once paired via the OSO InCharge app, it will automatically shift its heating to off-peak periods. A £200\/year saving is projected based on typical usage patterns.\u003c\/div\u003e\n\u003cdiv class=\"section-label\"\u003eFrequently Asked Questions\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eWhat makes the S Charge different from a standard electric cylinder?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eThe S Charge is an Energy Smart Appliance (ESA). Unlike a standard cylinder that heats on a fixed timer, the S Charge connects to the internet, reads 30-minute ahead energy prices from your tariff provider, and automatically heats during the cheapest periods. It uses AI\/machine learning to learn your household's hot water patterns and always ensures hot water is available when you need it — at the lowest possible cost.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eWhich electricity tariffs does the S Charge work with?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eThe S Charge is designed for dynamic time-of-use tariffs where the unit price of electricity changes every 30 minutes in response to grid demand and renewable generation. Octopus Agile is the most common example in the UK. The unit retrieves 24-hour ahead pricing data via its internet connection and schedules heating accordingly.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eHow much can I save with the S Charge?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eOSO projects an average saving of around £200 per year for a typical household, achieved by consistently heating during the cheapest tariff windows and avoiding peak periods. Actual savings depend on your tariff, hot water usage, and local energy prices.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eCan I still control the cylinder manually if needed?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eYes. The OSO InCharge app gives you full manual control — you can override the smart schedule, boost the temperature immediately, set holiday mode (to prevent unnecessary heating while away), and view live temperature readings and historical usage data.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eHow much usable hot water does the S Charge 150 actually provide?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eBecause the cylinder stores water at 75°C, blended down to 60°C at the mixing valve, the effective usable hot water volume (at 40°C comfort temperature) is 261 litres — significantly more than the nominal 151L. This means you can often install a smaller cylinder than with a competitor product.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eWhat is the cylinder made from and what warranty applies?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eThe S Charge cylinder is made from stainless steel using OSO's ULTRAWELD Duplex laser-welded construction for superior corrosion resistance. The cylinder carries a 25-year warranty against material and manufacturing defects. The immersion heater and electrical components carry a 2-year warranty.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eDoes the S Charge work if my broadband goes down?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eYes. If the internet connection is lost, the cylinder falls back to its last-known heating schedule or a default schedule. You won't lose hot water — you just lose smart tariff optimisation until connectivity is restored. The app will notify you of connectivity issues.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eIs the S Charge suitable for hard water areas?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eYes. The TITANIUM IMMERSION heater is specifically designed for use in hard water areas, offering significantly better durability than standard stainless steel or incoloy elements. The stainless steel cylinder construction also provides inherent scale resistance.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eDoes the S Charge come with everything needed for Building Regulations compliance?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eYes. The G3 kit is factory-fitted, including two 8L integral expansion vessels (one on 150L models), PRV, strainer, expansion relief, drain cock, and tundish. Your G3-qualified installer will complete the commissioning checklist and issue the relevant documentation.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eCan the S Charge work with solar PV?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eYes. The OSO InCharge app supports solar panel integration, allowing the cylinder to prioritise heating when your solar PV is generating excess electricity. This maximises self-consumption and can further reduce running costs beyond the tariff optimisation savings.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":63639906025821,"sku":"11014146","price":1300.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OsoHotWaterCylinderinLivingroom.jpg?v=1772165762"},{"product_id":"oso-s-charge-200-s2s-supercharged-smart-direct-unvented-cylinder-200l-esa-time-of-use-tariff","title":"OSO Saga Charge 200 S2S Supercharged Smart Direct Unvented Cylinder | 200L | ESA Time-of-Use Tariff","description":"\u003cstyle\u003e\n ── Reset ── ,\n.qh-pd, .qh-pd *::before, .qh-pd *::after { box-sizing: border-box; margin: 0; padding: 0; }\n.qh-pd { font-family: inherit; font-size: 16px; line-height: 1.65; color: #1a1a1a; }\n\n ── Brand tokens ── ,\n Primary #008377 | Dark #005f55 | Light bg #e6f4f3 | Amber #f4a921 | Warn-orange #e65100 | Info-blue #1565c0 ,\n\n ── Badges ── ,\n.qh-pd .badge-row { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 1.25rem; }\n.qh-pd .badge { display: inline-block; font-size: 11px; font-weight: 700; border-radius: 4px;\n  padding: 3px 10px; letter-spacing: 0.05em; text-transform: uppercase; }\n.qh-pd .b-teal   { background: #008377; color: #fff; }\n.qh-pd .b-dark   { background: #005f55; color: #fff; }\n.qh-pd .b-amber  { background: #f4a921; color: #1a1a1a; }\n.qh-pd .b-grey   { background: #555;    color: #fff; }\n.qh-pd .b-blue   { background: #1565c0; color: #fff; }\n.qh-pd .b-outline { background: transparent; color: #008377; border: 1.5px solid #008377; }\n\n ── Section label ── ,\n.qh-pd .section-label {\n  font-size: 10.5px; font-weight: 800; letter-spacing: 0.14em; text-transform: uppercase;\n  color: #008377; margin-bottom: 0.55rem; margin-top: 1.7rem;\n  padding-bottom: 4px; border-bottom: 2px solid #008377; }\n\n ── Intro text ── ,\n.qh-pd .prod-desc { font-size: 15.5px; color: #2a2a2a; margin-bottom: 1.4rem; line-height: 1.8; }\n\n ── Feature list ── ,\n.qh-pd .feat-list { list-style: none; margin-bottom: 1.4rem; padding: 0; }\n.qh-pd .feat-list li { padding: 4px 0 4px 22px; position: relative; font-size: 15px; }\n.qh-pd .feat-list li::before { content: \"✓\"; position: absolute; left: 0;\n  color: #008377; font-weight: 800; font-size: 15px; }\n\n ── Variant spec table ── ,\n.qh-pd .table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; margin-bottom: 1.5rem; }\n.qh-pd .spec-table { width: 100%; border-collapse: collapse; font-size: 13.5px; min-width: 520px; }\n.qh-pd .spec-table th, .qh-pd .spec-table td { padding: 7px 11px; border-bottom: 1px solid #d4eeeb; vertical-align: top; word-break: break-word; }\n.qh-pd .spec-table thead th { background: #005f55; color: #fff; font-weight: 700; text-align: left; white-space: nowrap; }\n.qh-pd .spec-table thead th:first-child { min-width: 200px; }\n.qh-pd .spec-table tbody tr:nth-child(even) td { background: #e6f4f3; }\n.qh-pd .spec-table tbody tr:nth-child(odd)  td { background: #fff; }\n.qh-pd .spec-table tbody td:first-child { font-weight: 600; color: #005f55; }\n.qh-pd .sku { font-family: 'Courier New', monospace; font-size: 12px; background: #e6f4f3;\n  color: #005f55; padding: 2px 6px; border-radius: 3px; font-weight: 700; }\n\n ── Callouts ── ,\n.qh-pd .callout { padding: 0.85rem 1.15rem; border-radius: 0 6px 6px 0; margin: 0.9rem 0;\n  font-size: 14.5px; line-height: 1.7; }\n.qh-pd .callout-teal  { background: #e6f4f3; border-left: 4px solid #008377; color: #00443d; }\n.qh-pd .callout-amber { background: #fef8ec; border-left: 4px solid #f4a921; color: #4a3000; }\n.qh-pd .callout-warn  { background: #fff3e0; border-left: 4px solid #e65100; color: #4a1800; }\n.qh-pd .callout-blue  { background: #e8f4fd; border-left: 4px solid #1565c0; color: #0a2a50; }\n\n ── Steps (flexbox — Shopify safe) ── ,\n.qh-pd .steps { list-style: none; padding: 0; margin-bottom: 1.4rem; counter-reset: step; }\n.qh-pd .steps li { counter-increment: step; display: flex; align-items: flex-start; gap: 0.85rem;\n  padding: 0.75rem; border-radius: 6px; margin-bottom: 0.5rem;\n  font-size: 14.5px; line-height: 1.7; background: #fff; border: 1px solid #d4eeeb; }\n.qh-pd .steps li::before { content: counter(step);\n  display: flex; align-items: center; justify-content: center;\n  flex: 0 0 28px; width: 28px; height: 28px; min-width: 28px; border-radius: 50%;\n  background: #008377; color: #fff; font-size: 13px; font-weight: 800; line-height: 1; margin-top: 3px; }\n.qh-pd .steps li strong { color: #005f55; }\n\n ── FAQ ── ,\n.qh-pd .faq-item { border-bottom: 1px solid #d4eeeb; padding: 0.85rem 0; }\n.qh-pd .faq-item:last-child { border-bottom: none; }\n.qh-pd .faq-q { font-size: 14.5px; font-weight: 700; color: #005f55;\n  padding-left: 1.4rem; position: relative; }\n.qh-pd .faq-q::before { content: \"Q\"; position: absolute; left: 0; color: #008377; font-weight: 900; }\n.qh-pd .faq-a { font-size: 14px; color: #2a2a2a; margin-top: 0.4rem; padding-left: 1.4rem; line-height: 1.7; }\n\n ── Box grid (what's included) ── ,\n.qh-pd .box-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));\n  gap: 0.6rem; margin-bottom: 1.4rem; }\n.qh-pd .box-item { background: #e6f4f3; border: 1px solid #b2dcd8; border-radius: 6px;\n  padding: 0.6rem 0.75rem; font-size: 13.5px; color: #00443d;\n  display: flex; align-items: flex-start; gap: 0.4rem; }\n.qh-pd .box-item::before { content: \"✔\"; color: #008377; font-weight: 900; flex-shrink: 0; margin-top: 1px; }\n\n ── Dark strip ── ,\n.qh-pd .dark-strip { background: #005f55; color: #fff; border-radius: 6px;\n  padding: 0.8rem 1.1rem; font-size: 14px; margin-bottom: 1.4rem; line-height: 1.7; }\n.qh-pd .dark-strip strong { color: #7fe8df; }\n\n ── Advantage pills ── ,\n.qh-pd .adv-grid { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.4rem; }\n.qh-pd .adv-pill { background: #005f55; color: #fff; border-radius: 20px;\n  padding: 5px 14px; font-size: 13px; font-weight: 700; }\n\u003c\/style\u003e\n\n\u003cdiv class=\"qh-pd\"\u003e\n\u003cdiv class=\"badge-row\"\u003e\n\u003cspan class=\"badge b-teal\"\u003eSmart Energy Appliance (ESA)\u003c\/span\u003e\u003cspan class=\"badge b-dark\"\u003eS2S Supercharged\u003c\/span\u003e\u003cspan class=\"badge b-amber\"\u003e200L Direct Unvented Cylinder\u003c\/span\u003e\u003cspan class=\"badge b-teal\"\u003eTime-of-Use Tariff Ready\u003c\/span\u003e\u003cspan class=\"badge b-blue\"\u003eOSO InCharge App\u003c\/span\u003e\u003cspan class=\"badge b-grey\"\u003e3 kW Titanium Immersion\u003c\/span\u003e\u003cspan class=\"badge b-outline\"\u003e25-Year Cylinder Warranty\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp class=\"prod-desc\"\u003eThe OSO S Charge 200 (internally the S2S 202L) is an Energy Smart Appliance (ESA) — a direct electric unvented hot water cylinder that actively connects to time-of-use electricity tariffs, automatically scheduling its heating to the cheapest available 30-minute pricing windows. It is fully pre-plumbed and wired using OSO's patented S-DESIGN, with all pipework, expansion vessels, and cabling concealed behind a removable lid. Heated by a 3 kW titanium-grade immersion heater (TITANIUM IMMERSION — durable in hard water), the S Charge 200 stores water at 75°C for maximum hot water availability and Legionella compliance. The integrated OSO InCharge system connects to the cloud, reads day-ahead energy prices (e.g. Octopus Agile), and heats during the lowest-cost periods — OSO projects average savings of around £200 per year. Three internal temperature sensors provide precise control. The cylinder is built from stainless steel using ULTRAWELD laser-welded Duplex steel construction, carries a 25-year cylinder warranty, and meets Building Regulations G3 with a factory-fitted G3 kit including integral expansion vessels, PRV, strainer, tundish, and drain cock.\u003c\/p\u003e\n\u003cdiv class=\"section-label\"\u003eKey Features\u003c\/div\u003e\n\u003cul class=\"feat-list\"\u003e\n\u003cli\u003eEnergy Smart Appliance (ESA) — meets UK government smart appliance standards 3 years ahead of mandate\u003c\/li\u003e\n\u003cli\u003eConnects to time-of-use tariffs (e.g. Octopus Agile) — heats during cheapest 30-minute periods automatically\u003c\/li\u003e\n\u003cli\u003eOSO InCharge app: monitor live temperature, available hot water, historical usage, and set holiday mode\u003c\/li\u003e\n\u003cli\u003eMachine learning AI adapts to your daily hot water usage patterns to ensure availability at lowest cost\u003c\/li\u003e\n\u003cli\u003eProjected saving of ~£200\/year by avoiding peak electricity pricing\u003c\/li\u003e\n\u003cli\u003e3 kW TITANIUM IMMERSION heater — superior durability in hard water conditions\u003c\/li\u003e\n\u003cli\u003e75°C thermostat setpoint — maximises effective hot water capacity through temperature stratification\u003c\/li\u003e\n\u003cli\u003eEffective hot water capacity at 40°C: 343L — 200L cylinder delivers significantly more usable hot water than nominal volume\u003c\/li\u003e\n\u003cli\u003eS-DESIGN — all pipework, expansion vessels, cables concealed under lid for a clean, tidy installation\u003c\/li\u003e\n\u003cli\u003eNANOPUR high-grade insulation — excellent standing heat loss performance\u003c\/li\u003e\n\u003cli\u003eULTRAWELD — laser-welded Duplex stainless steel cylinder with 25-year warranty\u003c\/li\u003e\n\u003cli\u003eFully pre-plumbed and wired — up to 70% labour saving vs traditional cylinders\u003c\/li\u003e\n\u003cli\u003eIntegral G3 Building Regulations kit: 2 × 8L expansion vessels (factory-fitted), PRV, strainer, expansion relief, drain cock, tundish\u003c\/li\u003e\n\u003cli\u003eMixing valve preset to 60°C at draw-off point for user safety\u003c\/li\u003e\n\u003cli\u003eXL tapping profile — suitable for family homes with high hot water demand\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"section-label\"\u003eOSO Technology Advantages\u003c\/div\u003e\n\u003cdiv class=\"adv-grid\"\u003e\n\u003cspan class=\"adv-pill\"\u003eS-DESIGN — All Connections Hidden\u003c\/span\u003e\u003cspan class=\"adv-pill\"\u003eNANOPUR — High-Grade Insulation\u003c\/span\u003e\u003cspan class=\"adv-pill\"\u003eULTRAWELD — Superior Corrosion Resistance\u003c\/span\u003e\u003cspan class=\"adv-pill\"\u003eTITANIUM IMMERSION — Hard Water Durability\u003c\/span\u003e\u003cspan class=\"adv-pill\"\u003eTARIFF-READY — Smart ESA\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"section-label\"\u003eWhat's Included\u003c\/div\u003e\n\u003cdiv class=\"box-grid\"\u003e\n\u003cdiv class=\"box-item\"\u003eS Charge 200 (S2S 202L) direct cylinder\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003e3 kW TITANIUM IMMERSION heater (factory-fitted)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eMixing valve — preset 60°C\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eP\u0026amp;T safety valve (10 bar \/ 90–95°C)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003e2 × 8L integral expansion vessels (factory-fitted)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eInlet control valve (strainer + PRV + expansion relief)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eDrain cock\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eTundish\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eFitting template\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eInstallation manual\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"callout callout-blue\"\u003eℹ️ \u003cstrong\u003eSmart Tariff Connectivity:\u003c\/strong\u003e The S Charge 200 is an Energy Smart Appliance certified to work with flexible time-of-use tariffs. It knows energy prices 24 hours in advance and uses AI to learn your household's hot water demand, heating at the lowest-cost periods while always ensuring adequate hot water availability.\u003c\/div\u003e\n\u003cdiv class=\"section-label\"\u003eTechnical Specifications\u003c\/div\u003e\n\u003cdiv class=\"table-scroll\"\u003e\u003ctable class=\"spec-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eUnit\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Number\u003c\/td\u003e\n\u003ctd\u003eOSO\u003c\/td\u003e\n\u003ctd\u003e11014147\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInternal Model Name\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eS2S 202\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Volume\u003c\/td\u003e\n\u003ctd\u003eL\u003c\/td\u003e\n\u003ctd\u003e202\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEffective Capacity at 40°C\u003c\/td\u003e\n\u003ctd\u003eL\u003c\/td\u003e\n\u003ctd\u003e343\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (H × Ø)\u003c\/td\u003e\n\u003ctd\u003emm\u003c\/td\u003e\n\u003ctd\u003e1375 × 595\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight (empty)\u003c\/td\u003e\n\u003ctd\u003ekg\u003c\/td\u003e\n\u003ctd\u003e47\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight (full)\u003c\/td\u003e\n\u003ctd\u003ekg\u003c\/td\u003e\n\u003ctd\u003e246\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThermostat Setpoint\u003c\/td\u003e\n\u003ctd\u003e°C\u003c\/td\u003e\n\u003ctd\u003e75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat Loss (EN 12897)\u003c\/td\u003e\n\u003ctd\u003eW\u003c\/td\u003e\n\u003ctd\u003e58\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat Loss \/ 24 hrs\u003c\/td\u003e\n\u003ctd\u003ekWh\/day\u003c\/td\u003e\n\u003ctd\u003e1.39\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnnual Energy Consumption\u003c\/td\u003e\n\u003ctd\u003ekWh\/year\u003c\/td\u003e\n\u003ctd\u003e4482\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnergy Efficiency\u003c\/td\u003e\n\u003ctd\u003e%\u003c\/td\u003e\n\u003ctd\u003e37.4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnergy Rating\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTapping Profile\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eXL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImmersion Power\u003c\/td\u003e\n\u003ctd\u003ekW\u003c\/td\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElectrical Supply\u003c\/td\u003e\n\u003ctd\u003eV\u003c\/td\u003e\n\u003ctd\u003e240 V single-phase\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Operating Pressure\u003c\/td\u003e\n\u003ctd\u003ebar\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExpansion Vessels\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e2 × 8L factory-fitted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMixing Valve Preset\u003c\/td\u003e\n\u003ctd\u003e°C\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eP\u0026amp;T Valve Rating\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e10 bar \/ 90–95°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCylinder Material\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eStainless steel — ULTRAWELD Duplex laser-welded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImmersion Type\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eTITANIUM IMMERSION\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCylinder Warranty\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e25 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cdiv class=\"section-label\"\u003eInstallation Overview\u003c\/div\u003e\n\u003cdiv class=\"callout callout-warn\"\u003e⚠️ \u003cstrong\u003eQualified installer required:\u003c\/strong\u003e This is an unvented hot water cylinder. Installation must be carried out by a qualified installer holding a current G3 Unvented Hot Water Systems certificate (or equivalent). All electrical connections must comply with BS 7671.\u003c\/div\u003e\n\u003col class=\"steps\"\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003ePre-installation check:\u003c\/strong\u003e Confirm the cylinder will fit in the installation location — dimensions are 1375mm (H) × 595mm (Ø). Ensure the floor can support the full loaded weight. Allow 400mm clearance above the unit and 150mm at the rear for pipe connections.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eUse the fitting template:\u003c\/strong\u003e Fix the supplied fitting template to the rear wall. This locates the pre-cut pipe tails in the exact positions required for the S-DESIGN rear connection system. Drill and fix accordingly.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eConnect incoming cold mains:\u003c\/strong\u003e Connect the mains cold water supply to the integrated inlet control valve (strainer, PRV, expansion relief already factory-fitted). Ensure supply pressure is within system limits — install a PRV upstream if mains pressure exceeds 6 bar.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eConnect hot water outlets:\u003c\/strong\u003e Connect the hot water outlet to your distribution pipework. The factory-fitted mixing valve is preset to 60°C — do not alter without re-calculating downstream scalding risks.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eConnect tundish discharge:\u003c\/strong\u003e Connect the tundish outlet to a safe and visible discharge point in accordance with BS 6700 \/ Building Regulations Part G. Use an indirect discharge pipe with the correct air gap.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eElectrical connections:\u003c\/strong\u003e Connect the immersion heater to a dedicated 240V 13A fused connection unit (FCU). The smart ESA connectivity requires a broadband internet connection — follow the OSO InCharge app setup guide to pair the cylinder with your Wi-Fi network and energy tariff.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eFill, commission and test:\u003c\/strong\u003e Fill the cylinder slowly and check all connections for leaks. Open hot water outlets to bleed air. Switch on and allow the cylinder to heat to operating temperature. Confirm the mixing valve is correctly set. Complete the G3 commissioning record and hand it to the customer.\u003c\/div\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cdiv class=\"callout callout-amber\"\u003e💡 \u003cstrong\u003eSmart energy tip:\u003c\/strong\u003e The S Charge 200 works best with a dynamic time-of-use tariff such as Octopus Agile or Octopus Flux. Once paired via the OSO InCharge app, it will automatically shift its heating to off-peak periods. A £200\/year saving is projected based on typical usage patterns.\u003c\/div\u003e\n\u003cdiv class=\"section-label\"\u003eFrequently Asked Questions\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eWhat makes the S Charge different from a standard electric cylinder?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eThe S Charge is an Energy Smart Appliance (ESA). Unlike a standard cylinder that heats on a fixed timer, the S Charge connects to the internet, reads 30-minute ahead energy prices from your tariff provider, and automatically heats during the cheapest periods. It uses AI\/machine learning to learn your household's hot water patterns and always ensures hot water is available when you need it — at the lowest possible cost.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eWhich electricity tariffs does the S Charge work with?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eThe S Charge is designed for dynamic time-of-use tariffs where the unit price of electricity changes every 30 minutes in response to grid demand and renewable generation. Octopus Agile is the most common example in the UK. The unit retrieves 24-hour ahead pricing data via its internet connection and schedules heating accordingly.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eHow much can I save with the S Charge?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eOSO projects an average saving of around £200 per year for a typical household, achieved by consistently heating during the cheapest tariff windows and avoiding peak periods. Actual savings depend on your tariff, hot water usage, and local energy prices.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eCan I still control the cylinder manually if needed?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eYes. The OSO InCharge app gives you full manual control — you can override the smart schedule, boost the temperature immediately, set holiday mode (to prevent unnecessary heating while away), and view live temperature readings and historical usage data.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eHow much usable hot water does the S Charge 200 actually provide?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eBecause the cylinder stores water at 75°C, blended down to 60°C at the mixing valve, the effective usable hot water volume (at 40°C comfort temperature) is 343 litres — significantly more than the nominal 202L. This means you can often install a smaller cylinder than with a competitor product.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eWhat is the cylinder made from and what warranty applies?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eThe S Charge cylinder is made from stainless steel using OSO's ULTRAWELD Duplex laser-welded construction for superior corrosion resistance. The cylinder carries a 25-year warranty against material and manufacturing defects. The immersion heater and electrical components carry a 2-year warranty.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eDoes the S Charge work if my broadband goes down?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eYes. If the internet connection is lost, the cylinder falls back to its last-known heating schedule or a default schedule. You won't lose hot water — you just lose smart tariff optimisation until connectivity is restored. The app will notify you of connectivity issues.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eIs the S Charge suitable for hard water areas?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eYes. The TITANIUM IMMERSION heater is specifically designed for use in hard water areas, offering significantly better durability than standard stainless steel or incoloy elements. The stainless steel cylinder construction also provides inherent scale resistance.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eDoes the S Charge come with everything needed for Building Regulations compliance?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eYes. The G3 kit is factory-fitted, including two 8L integral expansion vessels (one on 150L models), PRV, strainer, expansion relief, drain cock, and tundish. Your G3-qualified installer will complete the commissioning checklist and issue the relevant documentation.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eCan the S Charge work with solar PV?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eYes. The OSO InCharge app supports solar panel integration, allowing the cylinder to prioritise heating when your solar PV is generating excess electricity. This maximises self-consumption and can further reduce running costs beyond the tariff optimisation savings.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":63639943840093,"sku":"11014147","price":1350.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OsoHotWaterCylinderinLivingroom.jpg?v=1772165762"},{"product_id":"oso-s-charge-250-s2s-supercharged-smart-direct-unvented-cylinder-250l","title":"OSO Saga Charge 250 S2S Supercharged Smart Direct Unvented Cylinder | 250L","description":"\u003cstyle\u003e\n ── Reset ── ,\n.qh-pd, .qh-pd *::before, .qh-pd *::after { box-sizing: border-box; margin: 0; padding: 0; }\n.qh-pd { font-family: inherit; font-size: 16px; line-height: 1.65; color: #1a1a1a; }\n\n ── Brand tokens ── ,\n Primary #008377 | Dark #005f55 | Light bg #e6f4f3 | Amber #f4a921 | Warn-orange #e65100 | Info-blue #1565c0 ,\n\n ── Badges ── ,\n.qh-pd .badge-row { display: flex; 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margin-bottom: 1.4rem; padding: 0; }\n.qh-pd .feat-list li { padding: 4px 0 4px 22px; position: relative; font-size: 15px; }\n.qh-pd .feat-list li::before { content: \"✓\"; position: absolute; left: 0;\n  color: #008377; font-weight: 800; font-size: 15px; }\n\n ── Variant spec table ── ,\n.qh-pd .table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; margin-bottom: 1.5rem; }\n.qh-pd .spec-table { width: 100%; border-collapse: collapse; font-size: 13.5px; min-width: 520px; }\n.qh-pd .spec-table th, .qh-pd .spec-table td { padding: 7px 11px; border-bottom: 1px solid #d4eeeb; vertical-align: top; word-break: break-word; }\n.qh-pd .spec-table thead th { background: #005f55; color: #fff; font-weight: 700; text-align: left; white-space: nowrap; }\n.qh-pd .spec-table thead th:first-child { min-width: 200px; }\n.qh-pd .spec-table tbody tr:nth-child(even) td { background: #e6f4f3; }\n.qh-pd .spec-table tbody tr:nth-child(odd)  td { background: #fff; }\n.qh-pd .spec-table tbody td:first-child { font-weight: 600; color: #005f55; }\n.qh-pd .sku { font-family: 'Courier New', monospace; font-size: 12px; background: #e6f4f3;\n  color: #005f55; padding: 2px 6px; border-radius: 3px; font-weight: 700; }\n\n ── Callouts ── ,\n.qh-pd .callout { padding: 0.85rem 1.15rem; border-radius: 0 6px 6px 0; margin: 0.9rem 0;\n  font-size: 14.5px; line-height: 1.7; }\n.qh-pd .callout-teal  { background: #e6f4f3; border-left: 4px solid #008377; color: #00443d; }\n.qh-pd .callout-amber { background: #fef8ec; border-left: 4px solid #f4a921; color: #4a3000; }\n.qh-pd .callout-warn  { background: #fff3e0; border-left: 4px solid #e65100; color: #4a1800; }\n.qh-pd .callout-blue  { background: #e8f4fd; border-left: 4px solid #1565c0; color: #0a2a50; }\n\n ── Steps (flexbox — Shopify safe) ── ,\n.qh-pd .steps { list-style: none; padding: 0; margin-bottom: 1.4rem; counter-reset: step; }\n.qh-pd .steps li { counter-increment: step; display: flex; align-items: flex-start; gap: 0.85rem;\n  padding: 0.75rem; border-radius: 6px; margin-bottom: 0.5rem;\n  font-size: 14.5px; line-height: 1.7; background: #fff; border: 1px solid #d4eeeb; }\n.qh-pd .steps li::before { content: counter(step);\n  display: flex; align-items: center; justify-content: center;\n  flex: 0 0 28px; width: 28px; height: 28px; min-width: 28px; border-radius: 50%;\n  background: #008377; color: #fff; font-size: 13px; font-weight: 800; line-height: 1; margin-top: 3px; }\n.qh-pd .steps li strong { color: #005f55; }\n\n ── FAQ ── ,\n.qh-pd .faq-item { border-bottom: 1px solid #d4eeeb; padding: 0.85rem 0; }\n.qh-pd .faq-item:last-child { border-bottom: none; }\n.qh-pd .faq-q { font-size: 14.5px; font-weight: 700; color: #005f55;\n  padding-left: 1.4rem; position: relative; }\n.qh-pd .faq-q::before { content: \"Q\"; position: absolute; left: 0; color: #008377; font-weight: 900; }\n.qh-pd .faq-a { font-size: 14px; color: #2a2a2a; margin-top: 0.4rem; padding-left: 1.4rem; line-height: 1.7; }\n\n ── Box grid (what's included) ── ,\n.qh-pd .box-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));\n  gap: 0.6rem; margin-bottom: 1.4rem; }\n.qh-pd .box-item { background: #e6f4f3; border: 1px solid #b2dcd8; border-radius: 6px;\n  padding: 0.6rem 0.75rem; font-size: 13.5px; color: #00443d;\n  display: flex; align-items: flex-start; gap: 0.4rem; }\n.qh-pd .box-item::before { content: \"✔\"; color: #008377; font-weight: 900; flex-shrink: 0; margin-top: 1px; }\n\n ── Dark strip ── ,\n.qh-pd .dark-strip { background: #005f55; color: #fff; border-radius: 6px;\n  padding: 0.8rem 1.1rem; font-size: 14px; margin-bottom: 1.4rem; line-height: 1.7; }\n.qh-pd .dark-strip strong { color: #7fe8df; }\n\n ── Advantage pills ── ,\n.qh-pd .adv-grid { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.4rem; }\n.qh-pd .adv-pill { background: #005f55; color: #fff; border-radius: 20px;\n  padding: 5px 14px; font-size: 13px; font-weight: 700; }\n\u003c\/style\u003e\n\n\u003cdiv class=\"qh-pd\"\u003e\n\u003cdiv class=\"badge-row\"\u003e\n\u003cspan class=\"badge b-teal\"\u003eSmart Energy Appliance (ESA)\u003c\/span\u003e\u003cspan class=\"badge b-dark\"\u003eS2S Supercharged\u003c\/span\u003e\u003cspan class=\"badge b-amber\"\u003e250L Direct Cylinder\u003c\/span\u003e\u003cspan class=\"badge b-teal\"\u003eTime-of-Use Tariff Ready\u003c\/span\u003e\u003cspan class=\"badge b-blue\"\u003eOSO InCharge App\u003c\/span\u003e\u003cspan class=\"badge b-grey\"\u003e3 kW Titanium Immersion\u003c\/span\u003e\u003cspan class=\"badge b-outline\"\u003e25-Year Cylinder Warranty\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp class=\"prod-desc\"\u003eThe OSO S Charge 250 (internally the S2S 254L) is an Energy Smart Appliance (ESA) — a direct electric unvented hot water cylinder that actively connects to time-of-use electricity tariffs, automatically scheduling its heating to the cheapest available 30-minute pricing windows. It is fully pre-plumbed and wired using OSO's patented S-DESIGN, with all pipework, expansion vessels, and cabling concealed behind a removable lid. Heated by a 3 kW titanium-grade immersion heater (TITANIUM IMMERSION — durable in hard water), the S Charge 250 stores water at 75°C for maximum hot water availability and Legionella compliance. The integrated OSO InCharge system connects to the cloud, reads day-ahead energy prices (e.g. Octopus Agile), and heats during the lowest-cost periods — OSO projects average savings of around £200 per year. Three internal temperature sensors provide precise control. The cylinder is built from stainless steel using ULTRAWELD laser-welded Duplex steel construction, carries a 25-year cylinder warranty, and meets Building Regulations G3 with a factory-fitted G3 kit including integral expansion vessels, PRV, strainer, tundish, and drain cock.\u003c\/p\u003e\n\u003cdiv class=\"section-label\"\u003eKey Features\u003c\/div\u003e\n\u003cul class=\"feat-list\"\u003e\n\u003cli\u003eEnergy Smart Appliance (ESA) — meets UK government smart appliance standards 3 years ahead of mandate\u003c\/li\u003e\n\u003cli\u003eConnects to time-of-use tariffs (e.g. Octopus Agile) — heats during cheapest 30-minute periods automatically\u003c\/li\u003e\n\u003cli\u003eOSO InCharge app: monitor live temperature, available hot water, historical usage, and set holiday mode\u003c\/li\u003e\n\u003cli\u003eMachine learning AI adapts to your daily hot water usage patterns to ensure availability at lowest cost\u003c\/li\u003e\n\u003cli\u003eProjected saving of ~£200\/year by avoiding peak electricity pricing\u003c\/li\u003e\n\u003cli\u003e3 kW TITANIUM IMMERSION heater — superior durability in hard water conditions\u003c\/li\u003e\n\u003cli\u003e75°C thermostat setpoint — maximises effective hot water capacity through temperature stratification\u003c\/li\u003e\n\u003cli\u003eEffective hot water capacity at 40°C: 464L — 250L cylinder delivers significantly more usable hot water than nominal volume\u003c\/li\u003e\n\u003cli\u003eS-DESIGN — all pipework, expansion vessels, cables concealed under lid for a clean, tidy installation\u003c\/li\u003e\n\u003cli\u003eNANOPUR high-grade insulation — excellent standing heat loss performance\u003c\/li\u003e\n\u003cli\u003eULTRAWELD — laser-welded Duplex stainless steel cylinder with 25-year warranty\u003c\/li\u003e\n\u003cli\u003eFully pre-plumbed and wired — up to 70% labour saving vs traditional cylinders\u003c\/li\u003e\n\u003cli\u003eIntegral G3 Building Regulations kit: 2 × 8L expansion vessels (factory-fitted), PRV, strainer, expansion relief, drain cock, tundish\u003c\/li\u003e\n\u003cli\u003eMixing valve preset to 60°C at draw-off point for user safety\u003c\/li\u003e\n\u003cli\u003eXL tapping profile — suitable for family homes with high hot water demand\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"section-label\"\u003eOSO Technology Advantages\u003c\/div\u003e\n\u003cdiv class=\"adv-grid\"\u003e\n\u003cspan class=\"adv-pill\"\u003eS-DESIGN — All Connections Hidden\u003c\/span\u003e\u003cspan class=\"adv-pill\"\u003eNANOPUR — High-Grade Insulation\u003c\/span\u003e\u003cspan class=\"adv-pill\"\u003eULTRAWELD — Superior Corrosion Resistance\u003c\/span\u003e\u003cspan class=\"adv-pill\"\u003eTITANIUM IMMERSION — Hard Water Durability\u003c\/span\u003e\u003cspan class=\"adv-pill\"\u003eTARIFF-READY — Smart ESA\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"section-label\"\u003eWhat's Included\u003c\/div\u003e\n\u003cdiv class=\"box-grid\"\u003e\n\u003cdiv class=\"box-item\"\u003eS Charge 250 (S2S 254L) direct cylinder\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003e3 kW TITANIUM IMMERSION heater (factory-fitted)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eMixing valve — preset 60°C\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eP\u0026amp;T safety valve (10 bar \/ 90–95°C)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003e2 × 8L integral expansion vessels (factory-fitted)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eInlet control valve (strainer + PRV + expansion relief)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eDrain cock\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eTundish\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eFitting template\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eInstallation manual\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"callout callout-blue\"\u003eℹ️ \u003cstrong\u003eSmart Tariff Connectivity:\u003c\/strong\u003e The S Charge 250 is an Energy Smart Appliance certified to work with flexible time-of-use tariffs. It knows energy prices 24 hours in advance and uses AI to learn your household's hot water demand, heating at the lowest-cost periods while always ensuring adequate hot water availability.\u003c\/div\u003e\n\u003cdiv class=\"section-label\"\u003eTechnical Specifications\u003c\/div\u003e\n\u003cdiv class=\"table-scroll\"\u003e\u003ctable class=\"spec-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eUnit\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Number\u003c\/td\u003e\n\u003ctd\u003eOSO\u003c\/td\u003e\n\u003ctd\u003e11014148\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInternal Model Name\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eS2S 254\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Volume\u003c\/td\u003e\n\u003ctd\u003eL\u003c\/td\u003e\n\u003ctd\u003e254\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEffective Capacity at 40°C\u003c\/td\u003e\n\u003ctd\u003eL\u003c\/td\u003e\n\u003ctd\u003e464\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (H × Ø)\u003c\/td\u003e\n\u003ctd\u003emm\u003c\/td\u003e\n\u003ctd\u003e1645 × 595\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight (empty)\u003c\/td\u003e\n\u003ctd\u003ekg\u003c\/td\u003e\n\u003ctd\u003e53\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight (full)\u003c\/td\u003e\n\u003ctd\u003ekg\u003c\/td\u003e\n\u003ctd\u003e304\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThermostat Setpoint\u003c\/td\u003e\n\u003ctd\u003e°C\u003c\/td\u003e\n\u003ctd\u003e75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat Loss (EN 12897)\u003c\/td\u003e\n\u003ctd\u003eW\u003c\/td\u003e\n\u003ctd\u003e69\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat Loss \/ 24 hrs\u003c\/td\u003e\n\u003ctd\u003ekWh\/day\u003c\/td\u003e\n\u003ctd\u003e1.66\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnnual Energy Consumption\u003c\/td\u003e\n\u003ctd\u003ekWh\/year\u003c\/td\u003e\n\u003ctd\u003e4349\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnergy Efficiency\u003c\/td\u003e\n\u003ctd\u003e%\u003c\/td\u003e\n\u003ctd\u003e38.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnergy Rating\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTapping Profile\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eXL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImmersion Power\u003c\/td\u003e\n\u003ctd\u003ekW\u003c\/td\u003e\n\u003ctd\u003e3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElectrical Supply\u003c\/td\u003e\n\u003ctd\u003eV\u003c\/td\u003e\n\u003ctd\u003e240 V single-phase\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Operating Pressure\u003c\/td\u003e\n\u003ctd\u003ebar\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExpansion Vessels\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e2 × 8L factory-fitted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMixing Valve Preset\u003c\/td\u003e\n\u003ctd\u003e°C\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eP\u0026amp;T Valve Rating\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e10 bar \/ 90–95°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCylinder Material\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eStainless steel — ULTRAWELD Duplex laser-welded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImmersion Type\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eTITANIUM IMMERSION\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCylinder Warranty\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e25 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cdiv class=\"section-label\"\u003eInstallation Overview\u003c\/div\u003e\n\u003cdiv class=\"callout callout-warn\"\u003e⚠️ \u003cstrong\u003eQualified installer required:\u003c\/strong\u003e This is an unvented hot water cylinder. Installation must be carried out by a qualified installer holding a current G3 Unvented Hot Water Systems certificate (or equivalent). All electrical connections must comply with BS 7671.\u003c\/div\u003e\n\u003col class=\"steps\"\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003ePre-installation check:\u003c\/strong\u003e Confirm the cylinder will fit in the installation location — dimensions are 1645mm (H) × 595mm (Ø). Ensure the floor can support the full loaded weight. Allow 400mm clearance above the unit and 150mm at the rear for pipe connections.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eUse the fitting template:\u003c\/strong\u003e Fix the supplied fitting template to the rear wall. This locates the pre-cut pipe tails in the exact positions required for the S-DESIGN rear connection system. Drill and fix accordingly.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eConnect incoming cold mains:\u003c\/strong\u003e Connect the mains cold water supply to the integrated inlet control valve (strainer, PRV, expansion relief already factory-fitted). Ensure supply pressure is within system limits — install a PRV upstream if mains pressure exceeds 6 bar.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eConnect hot water outlets:\u003c\/strong\u003e Connect the hot water outlet to your distribution pipework. The factory-fitted mixing valve is preset to 60°C — do not alter without re-calculating downstream scalding risks.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eConnect tundish discharge:\u003c\/strong\u003e Connect the tundish outlet to a safe and visible discharge point in accordance with BS 6700 \/ Building Regulations Part G. Use an indirect discharge pipe with the correct air gap.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eElectrical connections:\u003c\/strong\u003e Connect the immersion heater to a dedicated 240V 13A fused connection unit (FCU). The smart ESA connectivity requires a broadband internet connection — follow the OSO InCharge app setup guide to pair the cylinder with your Wi-Fi network and energy tariff.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eFill, commission and test:\u003c\/strong\u003e Fill the cylinder slowly and check all connections for leaks. Open hot water outlets to bleed air. Switch on and allow the cylinder to heat to operating temperature. Confirm the mixing valve is correctly set. Complete the G3 commissioning record and hand it to the customer.\u003c\/div\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cdiv class=\"callout callout-amber\"\u003e💡 \u003cstrong\u003eSmart energy tip:\u003c\/strong\u003e The S Charge 250 works best with a dynamic time-of-use tariff such as Octopus Agile or Octopus Flux. Once paired via the OSO InCharge app, it will automatically shift its heating to off-peak periods. A £200\/year saving is projected based on typical usage patterns.\u003c\/div\u003e\n\u003cdiv class=\"section-label\"\u003eFrequently Asked Questions\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eWhat makes the S Charge different from a standard electric cylinder?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eThe S Charge is an Energy Smart Appliance (ESA). Unlike a standard cylinder that heats on a fixed timer, the S Charge connects to the internet, reads 30-minute ahead energy prices from your tariff provider, and automatically heats during the cheapest periods. It uses AI\/machine learning to learn your household's hot water patterns and always ensures hot water is available when you need it — at the lowest possible cost.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eWhich electricity tariffs does the S Charge work with?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eThe S Charge is designed for dynamic time-of-use tariffs where the unit price of electricity changes every 30 minutes in response to grid demand and renewable generation. Octopus Agile is the most common example in the UK. The unit retrieves 24-hour ahead pricing data via its internet connection and schedules heating accordingly.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eHow much can I save with the S Charge?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eOSO projects an average saving of around £200 per year for a typical household, achieved by consistently heating during the cheapest tariff windows and avoiding peak periods. Actual savings depend on your tariff, hot water usage, and local energy prices.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eCan I still control the cylinder manually if needed?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eYes. The OSO InCharge app gives you full manual control — you can override the smart schedule, boost the temperature immediately, set holiday mode (to prevent unnecessary heating while away), and view live temperature readings and historical usage data.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eHow much usable hot water does the S Charge 250 actually provide?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eBecause the cylinder stores water at 75°C, blended down to 60°C at the mixing valve, the effective usable hot water volume (at 40°C comfort temperature) is 464 litres — significantly more than the nominal 254L. This means you can often install a smaller cylinder than with a competitor product.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eWhat is the cylinder made from and what warranty applies?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eThe S Charge cylinder is made from stainless steel using OSO's ULTRAWELD Duplex laser-welded construction for superior corrosion resistance. The cylinder carries a 25-year warranty against material and manufacturing defects. The immersion heater and electrical components carry a 2-year warranty.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eDoes the S Charge work if my broadband goes down?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eYes. If the internet connection is lost, the cylinder falls back to its last-known heating schedule or a default schedule. You won't lose hot water — you just lose smart tariff optimisation until connectivity is restored. The app will notify you of connectivity issues.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eIs the S Charge suitable for hard water areas?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eYes. The TITANIUM IMMERSION heater is specifically designed for use in hard water areas, offering significantly better durability than standard stainless steel or incoloy elements. The stainless steel cylinder construction also provides inherent scale resistance.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eDoes the S Charge come with everything needed for Building Regulations compliance?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eYes. The G3 kit is factory-fitted, including two 8L integral expansion vessels (one on 150L models), PRV, strainer, expansion relief, drain cock, and tundish. Your G3-qualified installer will complete the commissioning checklist and issue the relevant documentation.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eCan the S Charge work with solar PV?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eYes. The OSO InCharge app supports solar panel integration, allowing the cylinder to prioritise heating when your solar PV is generating excess electricity. This maximises self-consumption and can further reduce running costs beyond the tariff optimisation savings.\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":63639954260317,"sku":"11014148","price":1770.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OsoHotWaterCylinderinLivingroom.jpg?v=1772165762"},{"product_id":"oso-super-xpress-s2x-210l-direct-unvented-hot-water-cylinder-pre-plumbed-electric-25-year-warranty","title":"OSO Super Xpress S2X 210L Direct Unvented Hot Water Cylinder | Pre-Plumbed Electric | 25 Year Warranty","description":"\u003c!-- SEO Product Name: OSO Super Xpress S2X 210L Direct Unvented Hot Water Cylinder | 11011688 | Pre-Plumbed Electric | 25 Year Warranty --\u003e\n\u003cstyle\u003e\n ── Reset ── ,\n.qh-pd, .qh-pd *::before, .qh-pd *::after { box-sizing: border-box; margin: 0; padding: 0; }\n.qh-pd { font-family: inherit; font-size: 16px; line-height: 1.65; color: #1a1a1a; }\n\n ── Brand tokens ── ,\n Primary #008377 | Dark #005f55 | Light bg #e6f4f3 | Amber #f4a921 | Warn-orange #e65100 | Info-blue #1565c0 ,\n\n ── Badges ── ,\n.qh-pd .badge-row { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 1.25rem; }\n.qh-pd .badge { display: inline-block; font-size: 11px; font-weight: 700; border-radius: 4px;\n  padding: 3px 10px; letter-spacing: 0.05em; text-transform: uppercase; }\n.qh-pd .b-teal   { background: #008377; color: #fff; }\n.qh-pd .b-dark   { background: #005f55; color: #fff; }\n.qh-pd .b-amber  { background: #f4a921; color: #1a1a1a; }\n.qh-pd .b-grey   { background: #555;    color: #fff; }\n.qh-pd .b-blue   { background: #1565c0; color: #fff; }\n.qh-pd .b-outline { background: transparent; color: #008377; border: 1.5px solid #008377; }\n\n ── Section label ── ,\n.qh-pd .section-label {\n  font-size: 10.5px; font-weight: 800; letter-spacing: 0.14em; text-transform: uppercase;\n  color: #008377; margin-bottom: 0.55rem; margin-top: 1.7rem;\n  padding-bottom: 4px; border-bottom: 2px solid #008377; }\n\n ── Intro text ── ,\n.qh-pd .prod-desc { font-size: 15.5px; color: #2a2a2a; margin-bottom: 1.4rem; line-height: 1.8; }\n\n ── Feature list ── ,\n.qh-pd .feat-list { list-style: none; margin-bottom: 1.4rem; padding: 0; }\n.qh-pd .feat-list li { padding: 4px 0 4px 22px; position: relative; font-size: 15px; }\n.qh-pd .feat-list li::before { content: \"✓\"; position: absolute; left: 0;\n  color: #008377; font-weight: 800; font-size: 15px; }\n\n ── Variant spec table ── ,\n.qh-pd .table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; margin-bottom: 1.5rem; }\n.qh-pd .spec-table { width: 100%; border-collapse: collapse; font-size: 13.5px; min-width: 520px; }\n.qh-pd .spec-table th, .qh-pd .spec-table td { padding: 7px 11px; border-bottom: 1px solid #d4eeeb; vertical-align: top; word-break: break-word; }\n.qh-pd .spec-table thead th { background: #005f55; color: #fff; font-weight: 700; text-align: left; white-space: nowrap; }\n.qh-pd .spec-table thead th:first-child { min-width: 200px; }\n.qh-pd .spec-table tbody tr:nth-child(even) td { background: #e6f4f3; }\n.qh-pd .spec-table tbody tr:nth-child(odd)  td { background: #fff; }\n.qh-pd .spec-table tbody td:first-child { font-weight: 600; color: #005f55; }\n.qh-pd .sku { font-family: 'Courier New', monospace; font-size: 12px; background: #e6f4f3;\n  color: #005f55; padding: 2px 6px; border-radius: 3px; font-weight: 700; }\n\n ── Callouts ── ,\n.qh-pd .callout { padding: 0.85rem 1.15rem; border-radius: 0 6px 6px 0; margin: 0.9rem 0;\n  font-size: 14.5px; line-height: 1.7; }\n.qh-pd .callout-teal  { background: #e6f4f3; border-left: 4px solid #008377; color: #00443d; }\n.qh-pd .callout-amber { background: #fef8ec; border-left: 4px solid #f4a921; color: #4a3000; }\n.qh-pd .callout-warn  { background: #fff3e0; border-left: 4px solid #e65100; color: #4a1800; }\n.qh-pd .callout-blue  { background: #e8f4fd; border-left: 4px solid #1565c0; color: #0a2a50; }\n\n ── Steps (flexbox — Shopify safe) ── ,\n.qh-pd .steps { list-style: none; padding: 0; margin-bottom: 1.4rem; counter-reset: step; }\n.qh-pd .steps li { counter-increment: step; display: flex; align-items: flex-start; gap: 0.85rem;\n  padding: 0.75rem; border-radius: 6px; margin-bottom: 0.5rem;\n  font-size: 14.5px; line-height: 1.7; background: #fff; border: 1px solid #d4eeeb; }\n.qh-pd .steps li::before { content: counter(step);\n  display: flex; align-items: center; justify-content: center;\n  flex: 0 0 28px; width: 28px; height: 28px; min-width: 28px; border-radius: 50%;\n  background: #008377; color: #fff; font-size: 13px; font-weight: 800; line-height: 1; margin-top: 3px; }\n.qh-pd .steps li strong { color: #005f55; }\n\n ── FAQ ── ,\n.qh-pd .faq-item { border-bottom: 1px solid #d4eeeb; padding: 0.85rem 0; }\n.qh-pd .faq-item:last-child { border-bottom: none; }\n.qh-pd .faq-q { font-size: 14.5px; font-weight: 700; color: #005f55;\n  padding-left: 1.4rem; position: relative; }\n.qh-pd .faq-q::before { content: \"Q\"; position: absolute; left: 0; color: #008377; font-weight: 900; }\n.qh-pd .faq-a { font-size: 14px; color: #2a2a2a; margin-top: 0.4rem; padding-left: 1.4rem; line-height: 1.7; }\n\n ── Box grid (what's included) ── ,\n.qh-pd .box-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));\n  gap: 0.6rem; margin-bottom: 1.4rem; }\n.qh-pd .box-item { background: #e6f4f3; border: 1px solid #b2dcd8; border-radius: 6px;\n  padding: 0.6rem 0.75rem; font-size: 13.5px; color: #00443d;\n  display: flex; align-items: flex-start; gap: 0.4rem; }\n.qh-pd .box-item::before { content: \"✔\"; color: #008377; font-weight: 900; flex-shrink: 0; margin-top: 1px; }\n\n ── Dark strip ── ,\n.qh-pd .dark-strip { background: #005f55; color: #fff; border-radius: 6px;\n  padding: 0.8rem 1.1rem; font-size: 14px; margin-bottom: 1.4rem; line-height: 1.7; }\n.qh-pd .dark-strip strong { color: #7fe8df; }\n\n ── Advantage pills ── ,\n.qh-pd .adv-grid { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.4rem; }\n.qh-pd .adv-pill { background: #005f55; color: #fff; border-radius: 20px;\n  padding: 5px 14px; font-size: 13px; font-weight: 700; }\n\u003c\/style\u003e\n\n\u003cdiv class=\"qh-pd\"\u003e\n\u003cdiv class=\"badge-row\"\u003e\n\u003cspan class=\"badge b-teal\"\u003eDirect Unvented Cylinder\u003c\/span\u003e\u003cspan class=\"badge b-dark\"\u003eS2X 210L\u003c\/span\u003e\u003cspan class=\"badge b-amber\"\u003ePre-Plumbed \u0026amp; Pre-Wired\u003c\/span\u003e\u003cspan class=\"badge b-teal\"\u003e30% More Hot Water\u003c\/span\u003e\u003cspan class=\"badge b-grey\"\u003eTwin 3+3 kW Immersion\u003c\/span\u003e\u003cspan class=\"badge b-outline\"\u003e25-Year Cylinder Warranty\u003c\/span\u003e\u003cspan class=\"badge b-blue\"\u003eOff-Peak Tariff Ready\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp class=\"prod-desc\"\u003eThe OSO Super Xpress 2.0 (S2X) 210L is a direct electric unvented hot water cylinder that delivers up to 30% more usable hot water than comparable competitor cylinders, thanks to OSO's unique temperature stratification and cylinder geometry optimisation. Using OSO's patented S-DESIGN, all pipework, expansion vessels, and electrical cables are concealed under a lid for a clean, professional finish. The S2X 210L is insulated with 4th-generation PUR foam for excellent heat retention and low standing losses. The S2X up to 210L shares the same footprint as a washing machine (with an optional washing machine frame accessory), making it ideal for utility rooms and tight spaces. Twin 3 kW TITANIUM IMMERSION heaters (upper and lower) provide both rapid heat-up and off-peak economy flexibility. The entire G3 Building Regulations kit — expansion vessels, inlet control valve, tundish, drain cock — is factory-fitted, saving significant installation time. The S2X is built from stainless steel using OSO's ULTRAWELD Duplex laser-welded construction and backed by a 25-year cylinder warranty.\u003c\/p\u003e\n\u003cdiv class=\"section-label\"\u003eKey Features\u003c\/div\u003e\n\u003cul class=\"feat-list\"\u003e\n\u003cli\u003eUp to 30% MORE usable hot water than competitor cylinders of the same nominal volume\u003c\/li\u003e\n\u003cli\u003eEffective hot water capacity at 40°C: 353L from a 210L cylinder\u003c\/li\u003e\n\u003cli\u003eS-DESIGN: all pipe connections exit from the rear, all concealed under lid — clean professional finish\u003c\/li\u003e\n\u003cli\u003e4th-generation PUR foam insulation for reduced standing heat loss\u003c\/li\u003e\n\u003cli\u003eTwin 3+3 kW TITANIUM IMMERSION heaters — upper element for rapid heat-up, lower for off-peak economy heating\u003c\/li\u003e\n\u003cli\u003eTARIFF-READY: twin immersion configuration supports off-peak (Economy 7 \/ Economy 10) tariffs\u003c\/li\u003e\n\u003cli\u003e75°C thermostat setpoint — maximises stratification and effective hot water availability\u003c\/li\u003e\n\u003cli\u003eFully pre-plumbed and wired — integral expansion vessels and valve set factory-fitted, saving up to 70% installation time\u003c\/li\u003e\n\u003cli\u003eIntegral G3 kit: 2 × 8L expansion vessels, strainer, PRV, expansion relief, drain cock, tundish — all factory-fitted\u003c\/li\u003e\n\u003cli\u003eMixing valve preset to 60°C — scalding protection at draw-off points\u003c\/li\u003e\n\u003cli\u003eMains pressure hot water delivery to all outlets — no need for a pump\u003c\/li\u003e\n\u003cli\u003eULTRAWELD Duplex stainless steel laser-welded construction — 25-year cylinder warranty\u003c\/li\u003e\n\u003cli\u003eNANOPUR high-grade insulation system\u003c\/li\u003e\n\u003cli\u003eShortest cylinder system on the market — enables downsizing to a smaller volume with the same hot water output\u003c\/li\u003e\n\u003cli\u003eXL tapping profile — suitable for large family homes and high-demand properties\u003c\/li\u003e\n\u003cli\u003eShares washing machine footprint (to 210L) — fits in utility rooms and airing cupboards\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"section-label\"\u003eOSO Technology Advantages\u003c\/div\u003e\n\u003cdiv class=\"adv-grid\"\u003e\n\u003cspan class=\"adv-pill\"\u003eS-DESIGN — All Connections Hidden\u003c\/span\u003e\u003cspan class=\"adv-pill\"\u003eNANOPUR — High-Grade Insulation\u003c\/span\u003e\u003cspan class=\"adv-pill\"\u003eULTRAWELD — Superior Corrosion Resistance\u003c\/span\u003e\u003cspan class=\"adv-pill\"\u003eTITANIUM IMMERSION — Hard Water Durability\u003c\/span\u003e\u003cspan class=\"adv-pill\"\u003eTARIFF-READY — Twin Immersions\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"section-label\"\u003eWhat's Included\u003c\/div\u003e\n\u003cdiv class=\"box-grid\"\u003e\n\u003cdiv class=\"box-item\"\u003eS2X 210L direct cylinder (pre-plumbed \u0026amp; pre-wired)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eTwin 3+3 kW TITANIUM IMMERSION heaters (factory-fitted)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eMixing valve — preset 60°C\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eP\u0026amp;T safety valve (10 bar \/ 90–95°C)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003e2 × 8L integral expansion vessels (factory-fitted)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eInlet control valve (strainer + PRV + expansion relief)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eDrain cock\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eTundish\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eFitting template\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eInstallation manual\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"section-label\"\u003eTechnical Specifications\u003c\/div\u003e\n\u003cdiv class=\"table-scroll\"\u003e\u003ctable class=\"spec-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eUnit\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Number\u003c\/td\u003e\n\u003ctd\u003eOSO\u003c\/td\u003e\n\u003ctd\u003e11011688\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Name\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eS2X 210\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Volume\u003c\/td\u003e\n\u003ctd\u003eL\u003c\/td\u003e\n\u003ctd\u003e202\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEffective Capacity at 40°C\u003c\/td\u003e\n\u003ctd\u003eL\u003c\/td\u003e\n\u003ctd\u003e353\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (H × Ø)\u003c\/td\u003e\n\u003ctd\u003emm\u003c\/td\u003e\n\u003ctd\u003e1375 × 595\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight (empty)\u003c\/td\u003e\n\u003ctd\u003ekg\u003c\/td\u003e\n\u003ctd\u003e44\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight (full)\u003c\/td\u003e\n\u003ctd\u003ekg\u003c\/td\u003e\n\u003ctd\u003e246\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThermostat Setpoint\u003c\/td\u003e\n\u003ctd\u003e°C\u003c\/td\u003e\n\u003ctd\u003e75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat Loss (EN 12897)\u003c\/td\u003e\n\u003ctd\u003eW\u003c\/td\u003e\n\u003ctd\u003e64\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat Loss \/ 24 hrs\u003c\/td\u003e\n\u003ctd\u003ekWh\/day\u003c\/td\u003e\n\u003ctd\u003e1.536\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnnual Energy Consumption\u003c\/td\u003e\n\u003ctd\u003ekWh\/year\u003c\/td\u003e\n\u003ctd\u003e4482\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnergy Efficiency\u003c\/td\u003e\n\u003ctd\u003e%\u003c\/td\u003e\n\u003ctd\u003e37.4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnergy Rating\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTapping Profile\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eXL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImmersion Power\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e3+3 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElectrical Supply\u003c\/td\u003e\n\u003ctd\u003eV\u003c\/td\u003e\n\u003ctd\u003e240 V single-phase\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Operating Pressure\u003c\/td\u003e\n\u003ctd\u003ebar\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExpansion Vessels\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e2 × 8L factory-fitted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMixing Valve Preset\u003c\/td\u003e\n\u003ctd\u003e°C\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eP\u0026amp;T Valve Rating\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e10 bar \/ 90–95°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCylinder Material\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eStainless steel — ULTRAWELD Duplex laser-welded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImmersion Type\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eTITANIUM IMMERSION (upper + lower)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInsulation\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e4th-generation PUR foam (NANOPUR)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCylinder Warranty\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e25 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cdiv class=\"callout callout-teal\"\u003eℹ️ \u003cstrong\u003eDownsize with confidence:\u003c\/strong\u003e Because the S2X 210L delivers up to 30% more usable hot water than competitor cylinders of the same nominal size, many installers can specify a smaller S2X model and achieve the same or better hot water delivery. A smaller cylinder also means lower standing heat losses, helping with SAP \/ Part L compliance.\u003c\/div\u003e\n\u003cdiv class=\"section-label\"\u003eInstallation Overview\u003c\/div\u003e\n\u003cdiv class=\"callout callout-warn\"\u003e⚠️ \u003cstrong\u003eG3-qualified installer required:\u003c\/strong\u003e Installation must be carried out by an installer holding a current G3 Unvented Hot Water Systems qualification. All electrical work must comply with BS 7671. Notify Building Control if required by local authority.\u003c\/div\u003e\n\u003col class=\"steps\"\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eCheck dimensions and floor load:\u003c\/strong\u003e Confirm the cylinder footprint (1375mm H × 595mm Ø) fits the installation space. Allow a minimum 150mm clearance at the rear for connections and 400mm above the unit. Verify the floor can support the loaded weight (246 kg).\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eFix the fitting template:\u003c\/strong\u003e Tape the supplied template to the rear wall. Mark and drill the positions for the rear pipe tails. The S-DESIGN has all connections exiting from the rear — connect the pre-cut pipe tails to your distribution pipework before sliding the cylinder into place.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eCold water supply:\u003c\/strong\u003e Connect the mains cold supply to the integrated inlet control valve. Ensure mains pressure is within the 6-bar working pressure limit — fit an upstream PRV if needed. Do not use the balanced cold outlet for anything other than mixer showers (Water Regulations).\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eHot water and distribution pipework:\u003c\/strong\u003e Connect the hot water outlet to your distribution pipework. The factory-set 60°C mixing valve provides scalding protection. The S2X delivers mains pressure hot water — no pump is required.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eTundish and discharge pipe:\u003c\/strong\u003e Connect the tundish discharge to a suitable indirect discharge pipe with the correct air gap, positioned in accordance with BS 6700 and Building Regulations Part G.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eElectrical connections:\u003c\/strong\u003e Connect each immersion heater element to its own dedicated 240V 13A FCU. The lower element is typically wired to an off-peak tariff supply (Economy 7 \/ Economy 10) and the upper to the standard supply for top-up heating. Follow the wiring diagram in the installation manual.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eFill, commission and test:\u003c\/strong\u003e Fill slowly with cold water. Bleed air from all hot outlets. Check for leaks. Switch on and allow to reach operating temperature. Test the mixing valve outlet temperature. Complete the G3 commissioning record.\u003c\/div\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cdiv class=\"section-label\"\u003eFrequently Asked Questions\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eHow does the S2X deliver 30% more hot water than other cylinders?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eThe S2X achieves this through a combination of precise cylinder geometry, temperature stratification at 75°C, and OSO's unique design. At 75°C, the stored water volume contains significantly more heat energy than competitors' cylinders set at 60°C. The effective usable capacity at 40°C draw-off temperature is 353L — well above the nominal 210L. This means you can often downsize, saving cost, space, and standing heat losses.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eWhat is the difference between the upper and lower immersion heaters?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eThe S2X has twin 3 kW immersion heaters. The upper element heats only the top portion of the cylinder for quick heat recovery — useful when you've used some hot water and need a rapid top-up. The lower element heats the full cylinder volume and is typically connected to an off-peak tariff (Economy 7 or Economy 10) to heat the whole tank overnight at cheaper rates. Both work independently.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eIs the S2X suitable for off-peak electricity tariffs?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eYes — the twin immersion design is specifically described as TARIFF-READY. The lower immersion can be wired to an off-peak supply and the upper to a standard supply. During off-peak hours, the lower element heats the full cylinder; during the day, the upper element provides top-up heating at any time. This can significantly reduce running costs.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eCan I install an S2X 210L as a replacement for an existing vented cylinder?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eYes, but you'll need to ensure your water supply is mains-fed (i.e. adequate mains pressure) and that there is no gravity-fed storage tank supplying the current system. A G3-qualified installer must carry out the installation, and Building Control notification may be required. The S-DESIGN rear-connection system also means the cylinder must have rear wall clearance of at least 150mm.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eWhat warranty does the S2X carry?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eThe stainless steel cylinder carries a 25-year warranty against defects in materials and manufacture — one of the best warranties in the UK market. Electrical components and valve gear carry a 2-year warranty.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eIs the S2X hard water compatible?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eYes. TITANIUM IMMERSION heaters are used throughout the S2X range, providing superior durability in hard water areas compared to standard stainless steel or incoloy elements. The Duplex stainless steel cylinder body is also inherently scale-resistant.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eDoes the S2X need a pump to deliver mains pressure hot water?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eNo. The S2X is an unvented cylinder connected directly to the mains cold water supply. Hot water is delivered at mains pressure to all outlets — no pump or header tank is required. This makes it ideal for power showers and multi-outlet simultaneous use.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eWhat is the tapping profile and what does XL mean?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eThe tapping profile is an ErP (Energy-related Products) classification describing how much hot water the cylinder can deliver in a standardised draw-off test. XL is a high-output profile, confirming the S2X is suitable for large households with multiple simultaneous outlets or high hot water demand.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eIs G3 compliance documentation included with the cylinder?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eYes — the factory-fitted G3 kit (expansion vessels, PRV, strainer, expansion relief, tundish, drain cock) means all the compliance components are already installed. Your G3-qualified installer will complete the commissioning checklist, which forms the compliance record for Building Regulations Part G3.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eCan the S2X be installed in an airing cupboard?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eYes. The S2X 210L requires 1375mm height clearance and 595mm diameter, plus 150mm rear clearance. The S-DESIGN concealed pipework keeps the installation tidy. The S2X up to 210L shares the footprint of a washing machine (with an optional washing machine frame), fitting in most utility rooms and airing cupboards.\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":63639968973149,"sku":"11011688","price":1110.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OsoSagaXpress150LUnventedDirectHotWaterCylinderPre-Plumbed.jpg?v=1770020582"},{"product_id":"oso-super-xpress-s2x-300l-direct-unvented-hot-water-cylinder-pre-plumbed-electric","title":"OSO Super Xpress S2X 300L Direct Unvented Hot Water Cylinder | Pre-Plumbed Electric","description":"\u003cstyle\u003e\n ── Reset ── ,\n.qh-pd, .qh-pd *::before, .qh-pd *::after { box-sizing: border-box; margin: 0; padding: 0; }\n.qh-pd { font-family: inherit; font-size: 16px; line-height: 1.65; color: #1a1a1a; }\n\n ── Brand tokens ── ,\n Primary #008377 | Dark #005f55 | Light bg #e6f4f3 | Amber #f4a921 | Warn-orange #e65100 | Info-blue #1565c0 ,\n\n ── Badges ── ,\n.qh-pd .badge-row { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 1.25rem; }\n.qh-pd .badge { display: inline-block; font-size: 11px; font-weight: 700; border-radius: 4px;\n  padding: 3px 10px; letter-spacing: 0.05em; text-transform: uppercase; }\n.qh-pd .b-teal   { background: #008377; color: #fff; }\n.qh-pd .b-dark   { background: #005f55; color: #fff; }\n.qh-pd .b-amber  { background: #f4a921; color: #1a1a1a; }\n.qh-pd .b-grey   { background: #555;    color: #fff; }\n.qh-pd .b-blue   { background: #1565c0; color: #fff; }\n.qh-pd .b-outline { background: transparent; color: #008377; border: 1.5px solid #008377; }\n\n ── Section label ── ,\n.qh-pd .section-label {\n  font-size: 10.5px; font-weight: 800; letter-spacing: 0.14em; text-transform: uppercase;\n  color: #008377; margin-bottom: 0.55rem; margin-top: 1.7rem;\n  padding-bottom: 4px; border-bottom: 2px solid #008377; }\n\n ── Intro text ── ,\n.qh-pd .prod-desc { font-size: 15.5px; color: #2a2a2a; margin-bottom: 1.4rem; line-height: 1.8; }\n\n ── Feature list ── ,\n.qh-pd .feat-list { list-style: none; margin-bottom: 1.4rem; padding: 0; }\n.qh-pd .feat-list li { padding: 4px 0 4px 22px; position: relative; font-size: 15px; }\n.qh-pd .feat-list li::before { content: \"✓\"; position: absolute; left: 0;\n  color: #008377; font-weight: 800; font-size: 15px; }\n\n ── Variant spec table ── ,\n.qh-pd .table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; margin-bottom: 1.5rem; }\n.qh-pd .spec-table { width: 100%; border-collapse: collapse; font-size: 13.5px; min-width: 520px; }\n.qh-pd .spec-table th, .qh-pd .spec-table td { padding: 7px 11px; border-bottom: 1px solid #d4eeeb; vertical-align: top; word-break: break-word; }\n.qh-pd .spec-table thead th { background: #005f55; color: #fff; font-weight: 700; text-align: left; white-space: nowrap; }\n.qh-pd .spec-table thead th:first-child { min-width: 200px; }\n.qh-pd .spec-table tbody tr:nth-child(even) td { background: #e6f4f3; }\n.qh-pd .spec-table tbody tr:nth-child(odd)  td { background: #fff; }\n.qh-pd .spec-table tbody td:first-child { font-weight: 600; color: #005f55; }\n.qh-pd .sku { font-family: 'Courier New', monospace; font-size: 12px; background: #e6f4f3;\n  color: #005f55; padding: 2px 6px; border-radius: 3px; font-weight: 700; }\n\n ── Callouts ── ,\n.qh-pd .callout { padding: 0.85rem 1.15rem; border-radius: 0 6px 6px 0; margin: 0.9rem 0;\n  font-size: 14.5px; line-height: 1.7; }\n.qh-pd .callout-teal  { background: #e6f4f3; border-left: 4px solid #008377; color: #00443d; }\n.qh-pd .callout-amber { background: #fef8ec; border-left: 4px solid #f4a921; color: #4a3000; }\n.qh-pd .callout-warn  { background: #fff3e0; border-left: 4px solid #e65100; color: #4a1800; }\n.qh-pd .callout-blue  { background: #e8f4fd; border-left: 4px solid #1565c0; color: #0a2a50; }\n\n ── Steps (flexbox — Shopify safe) ── ,\n.qh-pd .steps { list-style: none; padding: 0; margin-bottom: 1.4rem; counter-reset: step; }\n.qh-pd .steps li { counter-increment: step; display: flex; align-items: flex-start; gap: 0.85rem;\n  padding: 0.75rem; border-radius: 6px; margin-bottom: 0.5rem;\n  font-size: 14.5px; line-height: 1.7; background: #fff; border: 1px solid #d4eeeb; }\n.qh-pd .steps li::before { content: counter(step);\n  display: flex; align-items: center; justify-content: center;\n  flex: 0 0 28px; width: 28px; height: 28px; min-width: 28px; border-radius: 50%;\n  background: #008377; color: #fff; font-size: 13px; font-weight: 800; line-height: 1; margin-top: 3px; }\n.qh-pd .steps li strong { color: #005f55; }\n\n ── FAQ ── ,\n.qh-pd .faq-item { border-bottom: 1px solid #d4eeeb; padding: 0.85rem 0; }\n.qh-pd .faq-item:last-child { border-bottom: none; }\n.qh-pd .faq-q { font-size: 14.5px; font-weight: 700; color: #005f55;\n  padding-left: 1.4rem; position: relative; }\n.qh-pd .faq-q::before { content: \"Q\"; position: absolute; left: 0; color: #008377; font-weight: 900; }\n.qh-pd .faq-a { font-size: 14px; color: #2a2a2a; margin-top: 0.4rem; padding-left: 1.4rem; line-height: 1.7; }\n\n ── Box grid (what's included) ── ,\n.qh-pd .box-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));\n  gap: 0.6rem; margin-bottom: 1.4rem; }\n.qh-pd .box-item { background: #e6f4f3; border: 1px solid #b2dcd8; border-radius: 6px;\n  padding: 0.6rem 0.75rem; font-size: 13.5px; color: #00443d;\n  display: flex; align-items: flex-start; gap: 0.4rem; }\n.qh-pd .box-item::before { content: \"✔\"; color: #008377; font-weight: 900; flex-shrink: 0; margin-top: 1px; }\n\n ── Dark strip ── ,\n.qh-pd .dark-strip { background: #005f55; color: #fff; border-radius: 6px;\n  padding: 0.8rem 1.1rem; font-size: 14px; margin-bottom: 1.4rem; line-height: 1.7; }\n.qh-pd .dark-strip strong { color: #7fe8df; }\n\n ── Advantage pills ── ,\n.qh-pd .adv-grid { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.4rem; }\n.qh-pd .adv-pill { background: #005f55; color: #fff; border-radius: 20px;\n  padding: 5px 14px; font-size: 13px; font-weight: 700; }\n\u003c\/style\u003e\n\n\u003cdiv class=\"qh-pd\"\u003e\n\u003cdiv class=\"badge-row\"\u003e\n\u003cspan class=\"badge b-teal\"\u003eDirect Unvented Cylinder\u003c\/span\u003e\u003cspan class=\"badge b-dark\"\u003eS2X 300L\u003c\/span\u003e\u003cspan class=\"badge b-amber\"\u003ePre-Plumbed \u0026amp; Pre-Wired\u003c\/span\u003e\u003cspan class=\"badge b-teal\"\u003e30% More Hot Water\u003c\/span\u003e\u003cspan class=\"badge b-grey\"\u003eTwin 3+3 kW Immersion\u003c\/span\u003e\u003cspan class=\"badge b-outline\"\u003e25-Year Cylinder Warranty\u003c\/span\u003e\u003cspan class=\"badge b-blue\"\u003eOff-Peak Tariff Ready\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp class=\"prod-desc\"\u003eThe OSO Super Xpress 2.0 (S2X) 300L is a direct electric unvented hot water cylinder that delivers up to 30% more usable hot water than comparable competitor cylinders, thanks to OSO's unique temperature stratification and cylinder geometry optimisation. Using OSO's patented S-DESIGN, all pipework, expansion vessels, and electrical cables are concealed under a lid for a clean, professional finish. The S2X 300L is insulated with 4th-generation PUR foam for excellent heat retention and low standing losses. Twin 3 kW TITANIUM IMMERSION heaters (upper and lower) provide both rapid heat-up and off-peak economy flexibility. The entire G3 Building Regulations kit — expansion vessels, inlet control valve, tundish, drain cock — is factory-fitted, saving significant installation time. The S2X is built from stainless steel using OSO's ULTRAWELD Duplex laser-welded construction and backed by a 25-year cylinder warranty.\u003c\/p\u003e\n\u003cdiv class=\"section-label\"\u003eKey Features\u003c\/div\u003e\n\u003cul class=\"feat-list\"\u003e\n\u003cli\u003eUp to 30% MORE usable hot water than competitor cylinders of the same nominal volume\u003c\/li\u003e\n\u003cli\u003eEffective hot water capacity at 40°C: 495L from a 300L cylinder\u003c\/li\u003e\n\u003cli\u003eS-DESIGN: all pipe connections exit from the rear, all concealed under lid — clean professional finish\u003c\/li\u003e\n\u003cli\u003e4th-generation PUR foam insulation for reduced standing heat loss\u003c\/li\u003e\n\u003cli\u003eTwin 3+3 kW TITANIUM IMMERSION heaters — upper element for rapid heat-up, lower for off-peak economy heating\u003c\/li\u003e\n\u003cli\u003eTARIFF-READY: twin immersion configuration supports off-peak (Economy 7 \/ Economy 10) tariffs\u003c\/li\u003e\n\u003cli\u003e75°C thermostat setpoint — maximises stratification and effective hot water availability\u003c\/li\u003e\n\u003cli\u003eFully pre-plumbed and wired — integral expansion vessels and valve set factory-fitted, saving up to 70% installation time\u003c\/li\u003e\n\u003cli\u003eIntegral G3 kit: 2 × 8L expansion vessels, strainer, PRV, expansion relief, drain cock, tundish — all factory-fitted\u003c\/li\u003e\n\u003cli\u003eMixing valve preset to 60°C — scalding protection at draw-off points\u003c\/li\u003e\n\u003cli\u003eMains pressure hot water delivery to all outlets — no need for a pump\u003c\/li\u003e\n\u003cli\u003eULTRAWELD Duplex stainless steel laser-welded construction — 25-year cylinder warranty\u003c\/li\u003e\n\u003cli\u003eNANOPUR high-grade insulation system\u003c\/li\u003e\n\u003cli\u003eShortest cylinder system on the market — enables downsizing to a smaller volume with the same hot water output\u003c\/li\u003e\n\u003cli\u003eXL tapping profile — suitable for large family homes and high-demand properties\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"section-label\"\u003eOSO Technology Advantages\u003c\/div\u003e\n\u003cdiv class=\"adv-grid\"\u003e\n\u003cspan class=\"adv-pill\"\u003eS-DESIGN — All Connections Hidden\u003c\/span\u003e\u003cspan class=\"adv-pill\"\u003eNANOPUR — High-Grade Insulation\u003c\/span\u003e\u003cspan class=\"adv-pill\"\u003eULTRAWELD — Superior Corrosion Resistance\u003c\/span\u003e\u003cspan class=\"adv-pill\"\u003eTITANIUM IMMERSION — Hard Water Durability\u003c\/span\u003e\u003cspan class=\"adv-pill\"\u003eTARIFF-READY — Twin Immersions\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"section-label\"\u003eWhat's Included\u003c\/div\u003e\n\u003cdiv class=\"box-grid\"\u003e\n\u003cdiv class=\"box-item\"\u003eS2X 300L direct cylinder (pre-plumbed \u0026amp; pre-wired)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eTwin 3+3 kW TITANIUM IMMERSION heaters (factory-fitted)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eMixing valve — preset 60°C\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eP\u0026amp;T safety valve (10 bar \/ 90–95°C)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003e2 × 8L integral expansion vessels (factory-fitted)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eInlet control valve (strainer + PRV + expansion relief)\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eDrain cock\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eTundish\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eFitting template\u003c\/div\u003e\n\u003cdiv class=\"box-item\"\u003eInstallation manual\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"section-label\"\u003eTechnical Specifications\u003c\/div\u003e\n\u003cdiv class=\"table-scroll\"\u003e\u003ctable class=\"spec-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eUnit\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Number\u003c\/td\u003e\n\u003ctd\u003eOSO\u003c\/td\u003e\n\u003ctd\u003e11011690\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Name\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eS2X 300\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Volume\u003c\/td\u003e\n\u003ctd\u003eL\u003c\/td\u003e\n\u003ctd\u003e280\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEffective Capacity at 40°C\u003c\/td\u003e\n\u003ctd\u003eL\u003c\/td\u003e\n\u003ctd\u003e495\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (H × Ø)\u003c\/td\u003e\n\u003ctd\u003emm\u003c\/td\u003e\n\u003ctd\u003e1780 × 595\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight (empty)\u003c\/td\u003e\n\u003ctd\u003ekg\u003c\/td\u003e\n\u003ctd\u003e56\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight (full)\u003c\/td\u003e\n\u003ctd\u003ekg\u003c\/td\u003e\n\u003ctd\u003e336\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThermostat Setpoint\u003c\/td\u003e\n\u003ctd\u003e°C\u003c\/td\u003e\n\u003ctd\u003e75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat Loss (EN 12897)\u003c\/td\u003e\n\u003ctd\u003eW\u003c\/td\u003e\n\u003ctd\u003e82\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat Loss \/ 24 hrs\u003c\/td\u003e\n\u003ctd\u003ekWh\/day\u003c\/td\u003e\n\u003ctd\u003e1.968\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAnnual Energy Consumption\u003c\/td\u003e\n\u003ctd\u003ekWh\/year\u003c\/td\u003e\n\u003ctd\u003e4478\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnergy Efficiency\u003c\/td\u003e\n\u003ctd\u003e%\u003c\/td\u003e\n\u003ctd\u003e37.4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnergy Rating\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eD\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTapping Profile\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eXL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImmersion Power\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e3+3 kW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElectrical Supply\u003c\/td\u003e\n\u003ctd\u003eV\u003c\/td\u003e\n\u003ctd\u003e240 V single-phase\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Operating Pressure\u003c\/td\u003e\n\u003ctd\u003ebar\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExpansion Vessels\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e2 × 8L factory-fitted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMixing Valve Preset\u003c\/td\u003e\n\u003ctd\u003e°C\u003c\/td\u003e\n\u003ctd\u003e60\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eP\u0026amp;T Valve Rating\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e10 bar \/ 90–95°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCylinder Material\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eStainless steel — ULTRAWELD Duplex laser-welded\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImmersion Type\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eTITANIUM IMMERSION (upper + lower)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInsulation\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e4th-generation PUR foam (NANOPUR)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCylinder Warranty\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003e25 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cdiv class=\"callout callout-teal\"\u003eℹ️ \u003cstrong\u003eDownsize with confidence:\u003c\/strong\u003e Because the S2X 300L delivers up to 30% more usable hot water than competitor cylinders of the same nominal size, many installers can specify a smaller S2X model and achieve the same or better hot water delivery. A smaller cylinder also means lower standing heat losses, helping with SAP \/ Part L compliance.\u003c\/div\u003e\n\u003cdiv class=\"section-label\"\u003eInstallation Overview\u003c\/div\u003e\n\u003cdiv class=\"callout callout-warn\"\u003e⚠️ \u003cstrong\u003eG3-qualified installer required:\u003c\/strong\u003e Installation must be carried out by an installer holding a current G3 Unvented Hot Water Systems qualification. All electrical work must comply with BS 7671. Notify Building Control if required by local authority.\u003c\/div\u003e\n\u003col class=\"steps\"\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eCheck dimensions and floor load:\u003c\/strong\u003e Confirm the cylinder footprint (1780mm H × 595mm Ø) fits the installation space. Allow a minimum 150mm clearance at the rear for connections and 400mm above the unit. Verify the floor can support the loaded weight (336 kg).\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eFix the fitting template:\u003c\/strong\u003e Tape the supplied template to the rear wall. Mark and drill the positions for the rear pipe tails. The S-DESIGN has all connections exiting from the rear — connect the pre-cut pipe tails to your distribution pipework before sliding the cylinder into place.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eCold water supply:\u003c\/strong\u003e Connect the mains cold supply to the integrated inlet control valve. Ensure mains pressure is within the 6-bar working pressure limit — fit an upstream PRV if needed. Do not use the balanced cold outlet for anything other than mixer showers (Water Regulations).\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eHot water and distribution pipework:\u003c\/strong\u003e Connect the hot water outlet to your distribution pipework. The factory-set 60°C mixing valve provides scalding protection. The S2X delivers mains pressure hot water — no pump is required.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eTundish and discharge pipe:\u003c\/strong\u003e Connect the tundish discharge to a suitable indirect discharge pipe with the correct air gap, positioned in accordance with BS 6700 and Building Regulations Part G.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eElectrical connections:\u003c\/strong\u003e Connect each immersion heater element to its own dedicated 240V 13A FCU. The lower element is typically wired to an off-peak tariff supply (Economy 7 \/ Economy 10) and the upper to the standard supply for top-up heating. Follow the wiring diagram in the installation manual.\u003c\/div\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eFill, commission and test:\u003c\/strong\u003e Fill slowly with cold water. Bleed air from all hot outlets. Check for leaks. Switch on and allow to reach operating temperature. Test the mixing valve outlet temperature. Complete the G3 commissioning record.\u003c\/div\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cdiv class=\"section-label\"\u003eFrequently Asked Questions\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eHow does the S2X deliver 30% more hot water than other cylinders?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eThe S2X achieves this through a combination of precise cylinder geometry, temperature stratification at 75°C, and OSO's unique design. At 75°C, the stored water volume contains significantly more heat energy than competitors' cylinders set at 60°C. The effective usable capacity at 40°C draw-off temperature is 495L — well above the nominal 300L. This means you can often downsize, saving cost, space, and standing heat losses.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eWhat is the difference between the upper and lower immersion heaters?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eThe S2X has twin 3 kW immersion heaters. The upper element heats only the top portion of the cylinder for quick heat recovery — useful when you've used some hot water and need a rapid top-up. The lower element heats the full cylinder volume and is typically connected to an off-peak tariff (Economy 7 or Economy 10) to heat the whole tank overnight at cheaper rates. Both work independently.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eIs the S2X suitable for off-peak electricity tariffs?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eYes — the twin immersion design is specifically described as TARIFF-READY. The lower immersion can be wired to an off-peak supply and the upper to a standard supply. During off-peak hours, the lower element heats the full cylinder; during the day, the upper element provides top-up heating at any time. This can significantly reduce running costs.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eCan I install an S2X 300L as a replacement for an existing vented cylinder?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eYes, but you'll need to ensure your water supply is mains-fed (i.e. adequate mains pressure) and that there is no gravity-fed storage tank supplying the current system. A G3-qualified installer must carry out the installation, and Building Control notification may be required. The S-DESIGN rear-connection system also means the cylinder must have rear wall clearance of at least 150mm.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eWhat warranty does the S2X carry?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eThe stainless steel cylinder carries a 25-year warranty against defects in materials and manufacture — one of the best warranties in the UK market. Electrical components and valve gear carry a 2-year warranty.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eIs the S2X hard water compatible?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eYes. TITANIUM IMMERSION heaters are used throughout the S2X range, providing superior durability in hard water areas compared to standard stainless steel or incoloy elements. The Duplex stainless steel cylinder body is also inherently scale-resistant.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eDoes the S2X need a pump to deliver mains pressure hot water?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eNo. The S2X is an unvented cylinder connected directly to the mains cold water supply. Hot water is delivered at mains pressure to all outlets — no pump or header tank is required. This makes it ideal for power showers and multi-outlet simultaneous use.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eWhat is the tapping profile and what does XL mean?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eThe tapping profile is an ErP (Energy-related Products) classification describing how much hot water the cylinder can deliver in a standardised draw-off test. XL is a high-output profile, confirming the S2X is suitable for large households with multiple simultaneous outlets or high hot water demand.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eIs G3 compliance documentation included with the cylinder?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eYes — the factory-fitted G3 kit (expansion vessels, PRV, strainer, expansion relief, tundish, drain cock) means all the compliance components are already installed. Your G3-qualified installer will complete the commissioning checklist, which forms the compliance record for Building Regulations Part G3.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-q\"\u003eCan the S2X be installed in an airing cupboard?\u003c\/div\u003e\n\u003cdiv class=\"faq-a\"\u003eYes. The S2X 300L requires 1780mm height clearance and 595mm diameter, plus 150mm rear clearance. The S-DESIGN concealed pipework keeps the installation tidy.\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":63639983423837,"sku":"11011690","price":1350.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OsoSagaXpress150LUnventedDirectHotWaterCylinderPre-Plumbed.jpg?v=1770020582"},{"product_id":"oso-optima-ogc300-combined-heat-pump-cylinder-buffer-tank-225l-dhw-65l-buffer","title":"OSO Optima OGC300 Combined Heat Pump Cylinder \u0026 Buffer Tank | 225L DHW + 65L Buffer","description":"\u003cstyle\u003e\n ── Reset ── ,\n.qh-pd, .qh-pd *::before, .qh-pd *::after { box-sizing: border-box; margin: 0; padding: 0; }\n.qh-pd { font-family: inherit; font-size: 16px; line-height: 1.65; color: #1a1a1a; }\n\n ── Brand tokens ── ,\n Primary #008377 | Dark #005f55 | Light bg #e6f4f3 | Amber #f4a921 | Warn #e65100 | Blue #1565c0 ,\n\n ── Badges ── ,\n.qh-pd .badge-row { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 1.25rem; }\n.qh-pd .badge { display: inline-block; font-size: 11px; font-weight: 700; border-radius: 4px;\n  padding: 3px 10px; letter-spacing: 0.05em; text-transform: uppercase; }\n.qh-pd .b-teal    { background: #008377; color: #fff; }\n.qh-pd .b-dark    { background: #005f55; color: #fff; }\n.qh-pd .b-amber   { background: #f4a921; color: #1a1a1a; }\n.qh-pd .b-grey    { background: #555;    color: #fff; }\n.qh-pd .b-blue    { background: #1565c0; color: #fff; }\n.qh-pd .b-outline { background: transparent; color: #008377; border: 1.5px solid #008377; }\n\n ── Section label ── ,\n.qh-pd .section-label {\n  font-size: 10.5px; font-weight: 800; letter-spacing: 0.14em; text-transform: uppercase;\n  color: #008377; margin-bottom: 0.55rem; margin-top: 1.7rem;\n  padding-bottom: 4px; border-bottom: 2px solid #008377; }\n\n ── Intro text ── ,\n.qh-pd .prod-desc { font-size: 15.5px; color: #2a2a2a; margin-bottom: 1.4rem; line-height: 1.8; }\n.qh-pd .prod-desc strong { color: #005f55; }\n\n ── Feature list ── ,\n.qh-pd .feat-list { list-style: none; margin-bottom: 1.4rem; padding: 0; }\n.qh-pd .feat-list li { padding: 5px 0 5px 22px; position: relative; font-size: 15px; line-height: 1.65; }\n.qh-pd .feat-list li::before { content: \"✓\"; position: absolute; left: 0;\n  color: #008377; font-weight: 800; font-size: 15px; }\n Bold hook styling — inherits from inline \u003cstrong\u003e ,\n.qh-pd .feat-list li strong { color: #005f55; }\n\n ── Variant spec table ── ,\n.qh-pd .table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; margin-bottom: 1.5rem; }\n.qh-pd .spec-table { width: 100%; border-collapse: collapse; font-size: 13.5px; min-width: 420px; }\n.qh-pd .spec-table th, .qh-pd .spec-table td { padding: 7px 11px; border-bottom: 1px solid #d4eeeb; vertical-align: top; }\n.qh-pd .spec-table thead th { background: #005f55; color: #fff; font-weight: 700; text-align: left; }\n.qh-pd .spec-table thead th:first-child { min-width: 200px; }\n.qh-pd .spec-table tbody tr:nth-child(even) td { background: #e6f4f3; }\n.qh-pd .spec-table tbody tr:nth-child(odd)  td { background: #fff; }\n.qh-pd .spec-table tbody td:first-child { font-weight: 600; color: #005f55; }\n\n ── Split spec table (DHW vs Buffer) ── ,\n.qh-pd .spec-table thead th.col-dhw  { background: #007a6e; }\n.qh-pd .spec-table thead th.col-buf  { background: #3a7c73; }\n\n ── Callouts ── ,\n.qh-pd .callout { padding: 0.85rem 1.15rem; border-radius: 0 6px 6px 0; margin: 0.9rem 0;\n  font-size: 14.5px; line-height: 1.7; }\n.qh-pd .callout-teal  { background: #e6f4f3; border-left: 4px solid #008377; color: #00443d; }\n.qh-pd .callout-amber { background: #fef8ec; border-left: 4px solid #f4a921; color: #4a3000; }\n.qh-pd .callout-warn  { background: #fff3e0; border-left: 4px solid #e65100; color: #4a1800; }\n.qh-pd .callout-blue  { background: #e8f4fd; border-left: 4px solid #1565c0; color: #0a2a50; }\n\n ── Steps (flexbox — Shopify safe) ── ,\n.qh-pd .steps { list-style: none; padding: 0; margin-bottom: 1.4rem; counter-reset: step; }\n.qh-pd .steps li { counter-increment: step; display: flex; align-items: flex-start; gap: 0.85rem;\n  padding: 0.75rem; border-radius: 6px; margin-bottom: 0.5rem;\n  font-size: 14.5px; line-height: 1.7; background: #fff; border: 1px solid #d4eeeb; }\n.qh-pd .steps li::before { content: counter(step);\n  display: flex; align-items: center; justify-content: center;\n  flex: 0 0 28px; width: 28px; height: 28px; min-width: 28px; border-radius: 50%;\n  background: #008377; color: #fff; font-size: 13px; font-weight: 800; line-height: 1; margin-top: 3px; }\n.qh-pd .steps li strong { color: #005f55; }\n\n ── FAQ ── ,\n.qh-pd .faq-item { border-bottom: 1px solid #d4eeeb; padding: 0.85rem 0; }\n.qh-pd .faq-item:last-child { border-bottom: none; }\n.qh-pd .faq-q { font-size: 14.5px; font-weight: 700; color: #005f55;\n  padding-left: 1.4rem; position: relative; }\n.qh-pd .faq-q::before { content: \"Q\"; position: absolute; left: 0; color: #008377; font-weight: 900; }\n.qh-pd .faq-a { font-size: 14px; color: #2a2a2a; margin-top: 0.4rem; padding-left: 1.4rem; line-height: 1.7; }\n\n ── Box grid (what's included) ── ,\n.qh-pd .box-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));\n  gap: 0.6rem; margin-bottom: 1.4rem; }\n.qh-pd .box-item { background: #e6f4f3; border: 1px solid #b2dcd8; border-radius: 6px;\n  padding: 0.6rem 0.75rem; font-size: 13.5px; color: #00443d;\n  display: flex; align-items: flex-start; gap: 0.4rem; }\n.qh-pd .box-item::before { content: \"✔\"; color: #008377; font-weight: 900; flex-shrink: 0; margin-top: 1px; }\n\n ── Benefit strip (4-column) ── ,\n.qh-pd .benefit-strip { display: grid; grid-template-columns: repeat(auto-fit, minmax(145px,1fr));\n  gap: 0.6rem; margin-bottom: 1.4rem; }\n.qh-pd .benefit-card { background: #005f55; color: #fff; border-radius: 6px;\n  padding: 0.75rem 0.9rem; font-size: 13px; line-height: 1.5; }\n.qh-pd .benefit-card .bc-title { font-weight: 800; font-size: 13.5px; color: #7fe8df;\n  margin-bottom: 0.25rem; text-transform: uppercase; letter-spacing: 0.04em; }\n\n ── Adv pills ── ,\n.qh-pd .adv-grid { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.4rem; }\n.qh-pd .adv-pill { background: #005f55; color: #fff; border-radius: 20px;\n  padding: 5px 14px; font-size: 13px; font-weight: 700; }\n\u003c\/style\u003e\n\n\u003cdiv class=\"qh-pd\"\u003e\n\n\u003c!-- BADGES --\u003e\n\u003cdiv class=\"badge-row\"\u003e\n  \u003cspan class=\"badge b-teal\"\u003eHeat Pump Cylinder\u003c\/span\u003e\n  \u003cspan class=\"badge b-dark\"\u003e225L DHW + 65L Buffer\u003c\/span\u003e\n  \u003cspan class=\"badge b-amber\"\u003eSingle Footprint\u003c\/span\u003e\n  \u003cspan class=\"badge b-teal\"\u003eEnergy Rating A\/A\u003c\/span\u003e\n  \u003cspan class=\"badge b-blue\"\u003e36.5 kW Coil Output\u003c\/span\u003e\n  \u003cspan class=\"badge b-grey\"\u003eUp to 15 kW Heat Pump\u003c\/span\u003e\n  \u003cspan class=\"badge b-outline\"\u003e10-Year Warranty\u003c\/span\u003e\n\u003c\/div\u003e\n\n\u003c!-- INTRO --\u003e\n\u003cp class=\"prod-desc\"\u003eThe OSO Optima OGC300 is a unique \u003cstrong\u003ecombined domestic hot water cylinder and buffer\/volumiser tank in a single footprint\u003c\/strong\u003e, purpose-built for air source and ground source heat pump installations. Rather than requiring a separate cylinder and buffer tank with linking pipework between them, the OGC300 integrates a \u003cstrong\u003e225-litre DHW cylinder (upper section)\u003c\/strong\u003e and a \u003cstrong\u003e65-litre buffer\/volumiser vessel (lower section)\u003c\/strong\u003e within a single insulated stainless steel casing, 595mm in diameter and 1,776mm tall. This dramatically reduces the space, pipework, and labour required compared to a conventional two-tank heat pump system. The buffer pre-heats the DHW cylinder continuously, which keeps the heat pump's Coefficient of Performance (COP) high by maintaining a steady load. When domestic hot water is called for, the heat pump reaches the required temperature faster because the cylinder is never fully cold — reducing the time the property is deprived of space heating during DHW mode. The OGC300 can serve heat pumps up to 15 kW output, supports a 36.5 kW rated coil, and is backed by a \u003cstrong\u003e10-year cylinder warranty\u003c\/strong\u003e. A 2.8 kW INCOTEC backup immersion heater — connectable to solar PV — provides supplementary DHW heating when required.\u003c\/p\u003e\n\n\u003c!-- 4-CARD BENEFIT STRIP --\u003e\n\u003cdiv class=\"section-label\"\u003eThe Four Key Advantages\u003c\/div\u003e\n\u003cdiv class=\"benefit-strip\"\u003e\n  \u003cdiv class=\"benefit-card\"\u003e\n    \u003cdiv class=\"bc-title\"\u003eSpace Saving\u003c\/div\u003e\n    One unit replaces a separate cylinder and buffer tank — halving the footprint and eliminating inter-tank pipework.\n  \u003c\/div\u003e\n  \u003cdiv class=\"benefit-card\"\u003e\n    \u003cdiv class=\"bc-title\"\u003eCost Saving\u003c\/div\u003e\n    Lower installation cost than buying two separate tanks, less labour, fewer fittings, and simpler pipework routing.\n  \u003c\/div\u003e\n  \u003cdiv class=\"benefit-card\"\u003e\n    \u003cdiv class=\"bc-title\"\u003eHigher Efficiency\u003c\/div\u003e\n    Buffer pre-heating keeps the heat pump COP high and reduces heat loss from exposed inter-tank pipework.\n  \u003c\/div\u003e\n  \u003cdiv class=\"benefit-card\"\u003e\n    \u003cdiv class=\"bc-title\"\u003eGreater Comfort\u003c\/div\u003e\n    Pre-warmed DHW cylinder means shorter DHW-mode cycles — less time without space heating, faster hot water delivery.\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c!-- KEY FEATURES --\u003e\n\u003cdiv class=\"section-label\"\u003eKey Features\u003c\/div\u003e\n\u003cul class=\"feat-list\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSingle-footprint, two-tank design\u003c\/strong\u003e — 225L DHW cylinder and 65L buffer\/volumiser in one 595mm diameter unit, eliminating a separate buffer tank and all the pipework between them\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePre-heating keeps COP high\u003c\/strong\u003e — the buffer continuously pre-warms the DHW cylinder, maintaining a steady heat pump load, avoiding cold-start efficiency losses and preserving the optimal Coefficient of Performance\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShorter DHW-mode cycles\u003c\/strong\u003e — because the cylinder is never fully cold, the heat pump reaches the required DHW temperature faster, reducing the time the property goes without space heating\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible with heat pumps up to 15 kW\u003c\/strong\u003e — suitable for the majority of domestic ASHP and GSHP systems currently installed in the UK\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e36.5 kW rated heating coil\u003c\/strong\u003e — high-capacity primary coil for fast heat-up and recovery (19-minute heat-up from 10°C; 13-minute 70% recovery time)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e355-litre effective hot water capacity at 40°C\u003c\/strong\u003e — significantly more usable hot water than the nominal 225L cylinder volume, thanks to OSO's high-temperature stratification\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual A energy ratings\u003c\/strong\u003e — both DHW cylinder (upper) and buffer (lower) achieve ErP A class, supporting Building Regulations compliance and SAP calculations\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e2.8 kW INCOTEC backup immersion heater\u003c\/strong\u003e — provides DHW boost or backup when the heat pump is in maintenance, service, or defrost mode; connectable to solar PV for maximum self-consumption\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSolar PV ready\u003c\/strong\u003e — immersion heater position allows 100% of the DHW cylinder to be heated from solar PV or mains, maximising renewable self-consumption\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNANOPUR + VIP insulation\u003c\/strong\u003e — combination of PUR foam and Vacuum Insulation Panels (VIP) for exceptional standby heat retention, achieving just 45W \/ 1.08 kWh per day (DHW) and 20W \/ 0.74 kWh per day (buffer)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eULTRAWELD stainless steel construction\u003c\/strong\u003e — laser-welded Duplex stainless steel cylinder resists corrosion in all water conditions; 10-year cylinder warranty\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eS-DESIGN hidden connections\u003c\/strong\u003e — all pipework connections are concealed, keeping the plant room installation clean and professional\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntegrated G3 Building Regulations kit\u003c\/strong\u003e — 18L expansion vessel, inlet control valve (strainer, PRV, expansion relief), and tundish all factory-fitted, simplifying compliance\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeparate pressure circuits\u003c\/strong\u003e — upper DHW cylinder rated to 10 bar; lower buffer circuit rated to 2.5 bar (0.20 MPa), correctly matched to heat pump system pressures\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTemperature sensor slots\u003c\/strong\u003e — two sensor pockets (6mm and 8mm) pre-fitted for heat pump controller compatibility, supporting most ASHP and GSHP control systems\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTARIFF-READY immersion\u003c\/strong\u003e — backup immersion heater can be connected to off-peak electricity tariffs for cost-effective DHW top-up\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c!-- TECHNOLOGY PILLS --\u003e\n\u003cdiv class=\"section-label\"\u003eOSO Technology Advantages\u003c\/div\u003e\n\u003cdiv class=\"adv-grid\"\u003e\n  \u003cspan class=\"adv-pill\"\u003eS-DESIGN — All Connections Hidden\u003c\/span\u003e\n  \u003cspan class=\"adv-pill\"\u003eNANOPUR + VIP — Premium Insulation\u003c\/span\u003e\n  \u003cspan class=\"adv-pill\"\u003eULTRAWELD — Superior Corrosion Resistance\u003c\/span\u003e\n  \u003cspan class=\"adv-pill\"\u003eINCOTEC — Hard Water Durability\u003c\/span\u003e\n  \u003cspan class=\"adv-pill\"\u003eTARIFF-READY — Solar \u0026amp; Off-Peak Compatible\u003c\/span\u003e\n\u003c\/div\u003e\n\n\u003c!-- WHAT'S INCLUDED --\u003e\n\u003cdiv class=\"section-label\"\u003eWhat's Included\u003c\/div\u003e\n\u003cdiv class=\"box-grid\"\u003e\n  \u003cdiv class=\"box-item\"\u003eOGC300 combined cylinder\/buffer unit\u003c\/div\u003e\n  \u003cdiv class=\"box-item\"\u003e2.8 kW INCOTEC immersion heater (factory-fitted)\u003c\/div\u003e\n  \u003cdiv class=\"box-item\"\u003eT\u0026amp;P safety valve — 7 bar \/ 90–95°C (factory-fitted)\u003c\/div\u003e\n  \u003cdiv class=\"box-item\"\u003e18L expansion vessel (factory-fitted)\u003c\/div\u003e\n  \u003cdiv class=\"box-item\"\u003eG3 inlet group kit (strainer, PRV, expansion relief)\u003c\/div\u003e\n  \u003cdiv class=\"box-item\"\u003eTundish\u003c\/div\u003e\n  \u003cdiv class=\"box-item\"\u003eSafety cut-out — upper and lower circuits\u003c\/div\u003e\n  \u003cdiv class=\"box-item\"\u003eTemperature sensor pockets × 2 (6mm \u0026amp; 8mm)\u003c\/div\u003e\n  \u003cdiv class=\"box-item\"\u003eAdjustable feet (factory-fitted, 0–40mm range)\u003c\/div\u003e\n  \u003cdiv class=\"box-item\"\u003eStrain relievers × 2\u003c\/div\u003e\n  \u003cdiv class=\"box-item\"\u003eInstallation \u0026amp; commissioning manual\u003c\/div\u003e\n  \u003cdiv class=\"box-item\"\u003eService \u0026amp; commissioning logbook\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c!-- HOW IT WORKS --\u003e\n\u003cdiv class=\"section-label\"\u003eHow the OGC300 Works with a Heat Pump\u003c\/div\u003e\n\u003cdiv class=\"callout callout-teal\"\u003e\n  ℹ️ \u003cstrong\u003eTwo vessels, one system:\u003c\/strong\u003e The lower 65L buffer acts as the heat pump's primary thermal store — absorbing heat from the pump and smoothing out cycling. The upper 225L DHW vessel is pre-warmed by the buffer through its internal coil, so it's never starting from cold when the household calls for hot water. When the heat pump switches into DHW mode via its three-way valve, the cylinder reaches temperature quickly — and space heating resumes sooner.\n\u003c\/div\u003e\n\u003col class=\"steps\"\u003e\n  \u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eHeat pump runs in space heating mode:\u003c\/strong\u003e Heat is circulated through the lower buffer vessel, maintaining it at heat pump flow temperature. The buffer is slowly pre-heating the DHW cylinder via the internal coil.\u003c\/div\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eDHW demand is triggered\u003c\/strong\u003e (by timer or temperature drop): The heat pump's three-way valve diverts flow into dedicated DHW mode, now heating the pre-warmed DHW cylinder via the primary coil. Because the cylinder is already partially warm, this cycle is significantly shorter than with a cold cylinder.\u003c\/div\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eDHW cylinder reaches setpoint:\u003c\/strong\u003e The heat pump returns to space heating mode. The shorter DHW cycle means less time the property goes without space heating — improving comfort, particularly in colder weather.\u003c\/div\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eBackup immersion provides top-up or boost:\u003c\/strong\u003e If the heat pump cannot meet DHW demand (e.g. during defrost, maintenance, or extreme cold), the 2.8 kW INCOTEC immersion heater activates to maintain DHW temperature. This can also be triggered by solar PV export for maximum self-consumption.\u003c\/div\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eCOP remains high throughout:\u003c\/strong\u003e Because the buffer always provides a heat pump load, the heat pump avoids short-cycling and operates at larger, more efficient run cycles — maintaining peak COP rather than degrading through frequent starts and stops.\u003c\/div\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003c!-- TECHNICAL SPECIFICATIONS --\u003e\n\u003cdiv class=\"section-label\"\u003eTechnical Specifications\u003c\/div\u003e\n\u003cdiv class=\"table-scroll\"\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003cthead\u003e\n  \u003ctr\u003e\n    \u003cth\u003eSpecification\u003c\/th\u003e\n    \u003cth\u003eUnit\u003c\/th\u003e\n    \u003cth class=\"col-dhw\"\u003eDHW Cylinder (Upper)\u003c\/th\u003e\n    \u003cth class=\"col-buf\"\u003eBuffer \/ Volumiser (Lower)\u003c\/th\u003e\n  \u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n  \u003ctr\u003e\n\u003ctd\u003eProduct Number\u003c\/td\u003e\n\u003ctd\u003eOSO\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e11003523\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eProduct Name\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003eOGC300 — Optima\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eVolume\u003c\/td\u003e\n\u003ctd\u003eL\u003c\/td\u003e\n\u003ctd\u003e225\u003c\/td\u003e\n\u003ctd\u003e65\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eEffective Capacity at 40°C\u003c\/td\u003e\n\u003ctd\u003eL\u003c\/td\u003e\n\u003ctd\u003e355 (combined)\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eOuter Diameter\u003c\/td\u003e\n\u003ctd\u003emm\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e595\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eOverall Height\u003c\/td\u003e\n\u003ctd\u003emm\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e1,776\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eWeight (empty)\u003c\/td\u003e\n\u003ctd\u003ekg\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e65\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eWeight (full \/ net)\u003c\/td\u003e\n\u003ctd\u003ekg\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e355\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eEnergy Rating (ErP)\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eA\u003c\/td\u003e\n\u003ctd\u003eA\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eStandby Heat Loss\u003c\/td\u003e\n\u003ctd\u003eW\u003c\/td\u003e\n\u003ctd\u003e45\u003c\/td\u003e\n\u003ctd\u003e20\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eStandby Heat Loss \/ 24 hrs\u003c\/td\u003e\n\u003ctd\u003ekWh\/day\u003c\/td\u003e\n\u003ctd\u003e1.08\u003c\/td\u003e\n\u003ctd\u003e0.74\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eThermostat Setpoint (immersion)\u003c\/td\u003e\n\u003ctd\u003e°C\u003c\/td\u003e\n\u003ctd\u003e40–70 (adjustable)\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eSafety Thermostat Cut-out\u003c\/td\u003e\n\u003ctd\u003e°C\u003c\/td\u003e\n\u003ctd\u003e85\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eMax Operating Temperature\u003c\/td\u003e\n\u003ctd\u003e°C\u003c\/td\u003e\n\u003ctd\u003e70\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eMax Design Pressure\u003c\/td\u003e\n\u003ctd\u003ebar\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003ctd\u003e2.5\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eT\u0026amp;P Valve Rating\u003c\/td\u003e\n\u003ctd\u003ebar \/ °C\u003c\/td\u003e\n\u003ctd\u003e7 \/ 90–95\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003ePrimary Coil Power Output\u003c\/td\u003e\n\u003ctd\u003ekW\u003c\/td\u003e\n\u003ctd\u003e36.5\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003ePrimary Coil Surface Area\u003c\/td\u003e\n\u003ctd\u003em²\u003c\/td\u003e\n\u003ctd\u003e2.6\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003ePrimary Flow Rate (design)\u003c\/td\u003e\n\u003ctd\u003eL\/h\u003c\/td\u003e\n\u003ctd\u003e900\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eHeat-up Time from 10°C (coil)\u003c\/td\u003e\n\u003ctd\u003emin\u003c\/td\u003e\n\u003ctd\u003e19\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eRecovery Time to 70% (coil)\u003c\/td\u003e\n\u003ctd\u003emin\u003c\/td\u003e\n\u003ctd\u003e13\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eBackup Immersion Power\u003c\/td\u003e\n\u003ctd\u003ekW\u003c\/td\u003e\n\u003ctd\u003e2.8 @ 230V \/ 3.0 @ 240V\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eImmersion Heater Material\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd\u003eIncoloy 825 (INCOTEC)\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eElectrical Supply\u003c\/td\u003e\n\u003ctd\u003eV \/ Hz\u003c\/td\u003e\n\u003ctd\u003e220–240 VAC \/ 50 Hz\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eIP Classification\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003eIP21\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eInsulation Material\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003ePUR + Vacuum Insulation Panels (VIP)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eInsulation Thickness (average)\u003c\/td\u003e\n\u003ctd\u003emm\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e50\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eExpansion Vessel (supplied)\u003c\/td\u003e\n\u003ctd\u003eL\u003c\/td\u003e\n\u003ctd\u003e18\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eBuffer Connections\u003c\/td\u003e\n\u003ctd\u003einch BSP\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003eG 1\" female (upper \u0026amp; lower)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eDHW Cold Water Inlet\u003c\/td\u003e\n\u003ctd\u003einch BSP\u003c\/td\u003e\n\u003ctd\u003eG ¾\" female\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eDHW Hot Water Outlet\u003c\/td\u003e\n\u003ctd\u003einch BSP\u003c\/td\u003e\n\u003ctd\u003eG ¾\" female\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eCoil Connections (upper \u0026amp; lower)\u003c\/td\u003e\n\u003ctd\u003einch BSP\u003c\/td\u003e\n\u003ctd\u003eG ¾\" female\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eImmersion Heater Connection\u003c\/td\u003e\n\u003ctd\u003einch BSP\u003c\/td\u003e\n\u003ctd\u003eG 1¼\" female\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eT\u0026amp;P Valve Connection\u003c\/td\u003e\n\u003ctd\u003einch BSP\u003c\/td\u003e\n\u003ctd\u003eG ½\" female (factory-fitted)\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eTemperature Sensor Pockets\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e2 × (6mm and 8mm compatible)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eAdjustable Feet Range\u003c\/td\u003e\n\u003ctd\u003emm\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e0–40 (factory-fitted)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eMin Servicing Clearance (front)\u003c\/td\u003e\n\u003ctd\u003emm\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e400\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eMin Servicing Clearance (above)\u003c\/td\u003e\n\u003ctd\u003emm\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e150\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eCertification\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003eKIWA Watertec — Building \u0026amp; Water Regulations approved\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eUKCA Marking\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eQuality \/ Environmental\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003eISO 9001 \/ ISO 14001 \/ ISO 45001\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eCylinder Warranty\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e10 years\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003eComponents Warranty\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003ctd colspan=\"2\"\u003e2 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003c!-- INSTALLATION CALLOUT --\u003e\n\u003cdiv class=\"section-label\"\u003eInstallation Overview\u003c\/div\u003e\n\u003cdiv class=\"callout callout-warn\"\u003e⚠️ \u003cstrong\u003eQualified installer required:\u003c\/strong\u003e The OGC300 is an unvented hot water cylinder. Installation of the DHW section must be carried out by a G3-qualified unvented hot water installer. Heat pump connections must be carried out by a competent heat pump engineer. All electrical work must comply with BS 7671 and IET Wiring Regulations (minimum 16A dedicated supply, 20A double-pole isolation switch with 3mm contact separation). Mains cable must be rated to 90°C continuously.\u003c\/div\u003e\n\n\u003col class=\"steps\"\u003e\n  \u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eSiting and floor preparation:\u003c\/strong\u003e Position the OGC300 on a solid, level floor capable of supporting 355 kg (full weight). Allow 400mm clearance in front of the junction box covers and 150mm above the top of the unit. Unscrew the adjustable feet a minimum of 15mm from the base before levelling.\u003c\/div\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eFill the upper DHW cylinder first:\u003c\/strong\u003e Open the furthest hot water outlet and the mains cold supply stop cock. Allow water to flow until air is purged from the upper cylinder, then close taps and check all connections for leaks. The upper cylinder must be filled with water before the power is switched on.\u003c\/div\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eConnect the heat pump primary circuit:\u003c\/strong\u003e Connect the heat pump flow and return to the coil connections (E and F — G¾\" female). Connect the buffer tank connections (C and D — G1\" female) to the heat pump heating circuit as applicable. Fit a drain cock at the lowest point of the buffer circuit (not supplied). Fill and bleed the buffer\/heating circuit in accordance with the heat pump manufacturer's instructions.\u003c\/div\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eInstall temperature sensors:\u003c\/strong\u003e Fit 6mm or 8mm heat pump temperature sensors into the sensor pockets as required by your heat pump controller. Pull out the sensor bracket, insert the sensor, and refit ensuring full contact with the inner stainless steel wall surface.\u003c\/div\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eConnect DHW cold water inlet and hot water outlet:\u003c\/strong\u003e Connect mains cold water supply to connection H (G¾\" female). Connect hot water outlet to connection K (G¾\" female). A mixing valve (not supplied) is strongly recommended to prevent scalding at draw-off points — maximum stored temperature is 70°C.\u003c\/div\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eConnect T\u0026amp;P valve discharge and tundish:\u003c\/strong\u003e Connect the T\u0026amp;P valve discharge to a tundish and discharge pipe in accordance with Building Regulations Part G. Ensure a continuous fall to drain and a clear, visible discharge point. Discharge pipe must be metal rated to the relevant temperature.\u003c\/div\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eElectrical connections:\u003c\/strong\u003e Wire the 2.8 kW immersion heater to a dedicated 16A+ supply with a 20A double-pole isolation switch (3mm separation). Mains cable must withstand 90°C. Fit strain relievers (supplied) to both junction box cable entries. Do not switch on power until both vessels are filled with water.\u003c\/div\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cdiv\u003e\n\u003cstrong\u003eCommission and test:\u003c\/strong\u003e Verify all pipe connections for tightness and leaks. Test T\u0026amp;P valve by turning the knob counter-clockwise and confirming free flow to drain. Adjust immersion thermostat (40–70°C, minimum 60°C for Legionella prevention). Complete the G3 commissioning logbook (supplied) and hand all documentation to the customer.\u003c\/div\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003cdiv class=\"callout callout-amber\"\u003e💡 \u003cstrong\u003eMixer valve recommendation:\u003c\/strong\u003e The OGC300 stores DHW at up to 70°C. A thermostatic mixing valve (TMV) preset to a maximum of 60°C at draw-off is strongly recommended to prevent scalding risk, particularly where children or elderly users are present. This is a requirement under Part G of the Building Regulations for most domestic installations.\u003c\/div\u003e\n\n\u003cdiv class=\"callout callout-blue\"\u003eℹ️ \u003cstrong\u003eAnnual servicing:\u003c\/strong\u003e The OGC300 requires annual inspection and maintenance by a competent person to validate the 10-year cylinder warranty. This includes testing both safety valves, checking and recharging the expansion vessel (target 3 bar pre-charge), cleaning the line strainer, and recording service in the commissioning logbook. The immersion heater element must be removed for inspection after 5 years, then every 3 years thereafter — particularly important in hard water areas.\u003c\/div\u003e\n\n\u003c!-- FAQ --\u003e\n\u003cdiv class=\"section-label\"\u003eFrequently Asked Questions\u003c\/div\u003e\n\n\u003cdiv class=\"faq-item\"\u003e\n  \u003cdiv class=\"faq-q\"\u003eWhat is the difference between the DHW cylinder, the buffer, and the coil in the OGC300?\u003c\/div\u003e\n  \u003cdiv class=\"faq-a\"\u003eThe OGC300 contains three distinct but connected elements. The \u003cstrong\u003eupper 225L DHW cylinder\u003c\/strong\u003e stores potable domestic hot water for showers, baths, and taps. The \u003cstrong\u003elower 65L buffer\/volumiser\u003c\/strong\u003e is a closed heating circuit vessel — it stores heat pump flow water (non-potable) and acts as a thermal flywheel, smoothing heat pump cycling. The \u003cstrong\u003e36.5 kW internal coil\u003c\/strong\u003e transfers heat from the heat pump's primary circuit into the DHW cylinder — it is a heat exchanger, not a separate vessel. The three work together so that buffer heat continuously pre-warms the DHW cylinder through the coil.\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"faq-item\"\u003e\n  \u003cdiv class=\"faq-q\"\u003eWhy does combining the cylinder and buffer in one unit improve efficiency?\u003c\/div\u003e\n  \u003cdiv class=\"faq-a\"\u003eTwo reasons. First, \u003cstrong\u003eheat loss is reduced\u003c\/strong\u003e — in a conventional two-tank system, the pipework between the cylinder and buffer loses heat to the surrounding air (even if well lagged), whereas the OGC300 encapsulates both tanks within the same foam-insulated casing. Second, \u003cstrong\u003eCOP is maintained\u003c\/strong\u003e — because the buffer always provides a steady load to the heat pump, the heat pump runs in longer, more efficient cycles rather than short-cycling, which degrades efficiency. The OGC300 achieves both A-class ErP ratings for DHW and buffer.\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"faq-item\"\u003e\n  \u003cdiv class=\"faq-q\"\u003eDoes the OGC300 work with both air source and ground source heat pumps?\u003c\/div\u003e\n  \u003cdiv class=\"faq-a\"\u003eYes. The OGC300 is compatible with any heat pump — ASHP (air source) or GSHP (ground source) — up to 15 kW output that uses a three-way valve to switch between space heating and DHW modes. This covers the vast majority of domestic heat pump installations in the UK. Check your heat pump's flow rate and connection sizes against the OGC300's coil connections (G¾\" female, 900 L\/h design flow rate).\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"faq-item\"\u003e\n  \u003cdiv class=\"faq-q\"\u003eHow much usable hot water does the OGC300 actually provide?\u003c\/div\u003e\n  \u003cdiv class=\"faq-a\"\u003eThe nominal DHW cylinder volume is 225L, but the effective usable hot water capacity at 40°C draw-off temperature is \u003cstrong\u003e355 litres\u003c\/strong\u003e. This is because the cylinder stores water at up to 70°C — when blended down to 40°C comfort temperature, the volume of usable water is significantly greater than the nominal 225L. OSO rates this as sufficient for approximately 5.5 persons, making the OGC300 appropriate for larger family homes.\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"faq-item\"\u003e\n  \u003cdiv class=\"faq-q\"\u003eWhat is the maximum heat pump capacity the OGC300 can work with?\u003c\/div\u003e\n  \u003cdiv class=\"faq-a\"\u003eThe OGC300 is designed for heat pumps up to \u003cstrong\u003e15 kW output\u003c\/strong\u003e. The primary heating coil has a rated power output of 36.5 kW at the design flow rate of 900 L\/h, which comfortably accommodates the thermal output of domestic heat pumps in this range. For heat pumps larger than 15 kW, consult OSO for an appropriate commercial cylinder specification.\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"faq-item\"\u003e\n  \u003cdiv class=\"faq-q\"\u003eCan I connect solar PV to the OGC300?\u003c\/div\u003e\n  \u003cdiv class=\"faq-a\"\u003eYes. The 2.8 kW backup immersion heater can be connected to a solar PV diverter device, allowing excess solar generation to heat the DHW cylinder instead of being exported to the grid. The immersion heater position within the OGC300 is designed so that it can heat \u003cstrong\u003e100% of the DHW cylinder volume\u003c\/strong\u003e when operating from solar or mains — maximising self-consumption and reducing running costs.\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"faq-item\"\u003e\n  \u003cdiv class=\"faq-q\"\u003eWhat are the two separate pressure ratings, and why do they differ?\u003c\/div\u003e\n  \u003cdiv class=\"faq-a\"\u003eThe \u003cstrong\u003eupper DHW cylinder is rated to 10 bar\u003c\/strong\u003e — a standard mains-pressure unvented rating for potable hot water systems. The \u003cstrong\u003elower buffer circuit is rated to 2.5 bar\u003c\/strong\u003e — appropriate for a closed heating system connected to a heat pump, where operating pressures are typically 1–2 bar. These are physically separate circuits with no direct water connection, so the pressure difference is not a problem. Never attempt to connect mains water pressure to the buffer circuit.\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"faq-item\"\u003e\n  \u003cdiv class=\"faq-q\"\u003eHow does the OGC300 compare to installing a separate cylinder and buffer tank?\u003c\/div\u003e\n  \u003cdiv class=\"faq-a\"\u003eA conventional setup requires a DHW cylinder, a separate buffer tank, interconnecting pipework (and lagging), fittings for two G3 kits, and installation time for both units plus the pipework between them. The OGC300 eliminates all of this — single delivery, single installation footprint, single set of pipework connections, and one G3 kit included in the price. OSO reports significant reductions in both material cost and installation time. The combined insulation of both tanks within one casing also means less heat loss than two separately insulated tanks.\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"faq-item\"\u003e\n  \u003cdiv class=\"faq-q\"\u003eWhat warranty comes with the OGC300?\u003c\/div\u003e\n  \u003cdiv class=\"faq-a\"\u003eThe stainless steel cylinder carries a \u003cstrong\u003e10-year warranty\u003c\/strong\u003e against defects in materials and manufacture — provided the cylinder is serviced annually by a competent person and the service logbook (supplied) is updated at each service visit. Electrical components and valve gear carry a 2-year warranty. Warranty conditions include correct installation by a professional, use with compliant mains water (chloride \u0026lt;250 mg\/L, conductivity \u0026lt;750 µS\/cm at 25°C, pH 6.0–9.5), and hard water protection (max 10°dH hardness — a water softener is recommended above this).\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"faq-item\"\u003e\n  \u003cdiv class=\"faq-q\"\u003eDoes the OGC300 come with Building Regulations compliance documentation?\u003c\/div\u003e\n  \u003cdiv class=\"faq-a\"\u003eYes. The OGC300 is approved to Building Regulations and Water Regulations by \u003cstrong\u003eKIWA Watertec Ltd\u003c\/strong\u003e, the relevant UK notified body for unvented hot water systems. It carries UKCA marking and is supplied with a G3 inlet group kit (strainer, PRV, expansion relief, tundish) and an 18L expansion vessel, all factory-fitted. The supplied commissioning logbook, when completed by the G3-qualified installer, serves as the compliance record for Part G3 of the Building Regulations.\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":63640041947485,"sku":"OGC300","price":1795.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OSOOptimaOGC300HeatPumpCylinderwithBufferTank.webp?v=1772168082"},{"product_id":"oso-accu-a60-60l-stainless-steel-buffer-tank-for-heat-pumps-nanopur-insulation","title":"OSO ACCU A60 60L Stainless Steel Buffer Tank for Heat Pumps | NANOPUR Insulation","description":"\u003cstyle\u003e\n  .oso-buf-wrap{font-family:inherit;color:inherit;line-height:1.7;font-size:16px}\n  .oso-buf-wrap p,.oso-buf-wrap li,.oso-buf-wrap td,.oso-buf-wrap th{font-size:16px!important;line-height:1.7}\n  .oso-buf-wrap h2{font-size:22px!important;font-weight:700;color:#1a3a5c;border-bottom:3px solid #0077b6;padding-bottom:6px;margin:2rem 0 1rem;line-height:1.3}\n  .oso-buf-wrap p{margin:0 0 1rem}\n  .oso-buf-wrap ul{padding-left:1.5rem;margin:0 0 1rem}\n  .oso-buf-wrap ul li{margin-bottom:0.5rem}\n\n  .oso-buf-badge{display:inline-block;font-size:13px!important;font-weight:700;border-radius:4px;padding:2px 10px;margin-right:5px;margin-bottom:4px;vertical-align:middle}\n  .oso-buf-badge.blue{background:#0077b6;color:#fff}\n  .oso-buf-badge.navy{background:#1a3a5c;color:#fff}\n  .oso-buf-badge.green{background:#1a7a3c;color:#fff}\n  .oso-buf-badge.grey{background:#555;color:#fff}\n\n  .oso-buf-feature-strip{display:flex;flex-wrap:wrap;gap:0;border:1px solid #bde0f5;border-radius:8px;overflow:hidden;margin-bottom:1.5rem}\n  .oso-buf-feat{flex:1 1 110px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:0.85rem 0.5rem;background:#f0f8ff;border-right:1px solid #bde0f5;min-width:90px}\n  .oso-buf-feat:last-child{border-right:none}\n  .oso-buf-feat .feat-icon{font-size:24px;margin-bottom:0.3rem;line-height:1}\n  .oso-buf-feat .feat-label{font-size:12px!important;font-weight:700;color:#1a3a5c;line-height:1.3;margin-bottom:0.15rem}\n  .oso-buf-feat .feat-value{font-size:11px!important;color:#555;line-height:1.3}\n\n  .oso-buf-intro-box{background:#e0f2fe;border-left:4px solid #0077b6;padding:1.1rem 1.4rem;border-radius:0 6px 6px 0;margin-bottom:1.5rem}\n  .oso-buf-intro-box p{margin:0!important}\n\n  .oso-buf-why-box{background:#fff3cd;border:1px solid #ffc107;border-radius:5px;padding:0.9rem 1.1rem;margin:0.8rem 0 1.2rem}\n\n  .oso-buf-spec-table{width:100%;border-collapse:collapse;margin-bottom:1.5rem}\n  .oso-buf-spec-table th{background:#1a3a5c;color:#fff!important;text-align:left;padding:0.7rem 1rem;font-weight:700;font-size:16px!important}\n  .oso-buf-spec-table td{padding:0.6rem 1rem;border-bottom:1px solid #bde0f5;vertical-align:top;font-size:16px!important}\n  .oso-buf-spec-table tr:nth-child(even) td{background:#e0f2fe}\n  .oso-buf-spec-table td:first-child{font-weight:600;color:#111;width:44%}\n\n  .oso-buf-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:0.85rem;margin-bottom:1.2rem}\n  .oso-buf-card{background:#e0f2fe;border:1px solid #90caf9;border-radius:6px;padding:1rem 1.1rem;line-height:1.6}\n  .oso-buf-card strong{display:block;color:#1a3a5c;margin-bottom:0.35rem;font-size:16px!important}\n\n  .oso-buf-faq-item{border-bottom:1px solid #bde0f5;padding:0.9rem 0}\n  .oso-buf-faq-item:last-child{border-bottom:none}\n  .oso-buf-faq-item strong{color:#1a3a5c;font-size:16px!important;display:block;margin-bottom:0.3rem}\n\u003c\/style\u003e\n\u003cdiv class=\"oso-buf-wrap\"\u003e\n\n  \u003c!-- Badge pills --\u003e\n  \u003cdiv style=\"margin-bottom:1rem\"\u003e\n    \u003cspan class=\"oso-buf-badge blue\"\u003eOSO ACCU A60\u003c\/span\u003e\n    \u003cspan class=\"oso-buf-badge navy\"\u003e60 Litres\u003c\/span\u003e\n    \u003cspan class=\"oso-buf-badge green\"\u003eStainless Steel\u003c\/span\u003e\n    \u003cspan class=\"oso-buf-badge grey\"\u003eNANOPUR Insulation\u003c\/span\u003e\n    \u003cspan class=\"oso-buf-badge grey\"\u003eSKU 11009165\u003c\/span\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Feature strip --\u003e\n  \u003cdiv class=\"oso-buf-feature-strip\"\u003e\n    \u003cdiv class=\"oso-buf-feat\"\u003e\n\u003cdiv class=\"feat-icon\"\u003e🏗️\u003c\/div\u003e\n\u003cdiv class=\"feat-label\"\u003eStainless Steel\u003c\/div\u003e\n\u003cdiv class=\"feat-value\"\u003eEVERLAST™ titanium alloy\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-feat\"\u003e\n\u003cdiv class=\"feat-icon\"\u003e🌡️\u003c\/div\u003e\n\u003cdiv class=\"feat-label\"\u003eNANOPUR Insulation\u003c\/div\u003e\n\u003cdiv class=\"feat-value\"\u003eClass-leading heat retention\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-feat\"\u003e\n\u003cdiv class=\"feat-icon\"\u003e🔄\u003c\/div\u003e\n\u003cdiv class=\"feat-label\"\u003eDual Connections\u003c\/div\u003e\n\u003cdiv class=\"feat-value\"\u003eFlow + return both sides\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-feat\"\u003e\n\u003cdiv class=\"feat-icon\"\u003e🛡️\u003c\/div\u003e\n\u003cdiv class=\"feat-label\"\u003eAnti-Clocking\u003c\/div\u003e\n\u003cdiv class=\"feat-value\"\u003eProtects heat pump\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-feat\"\u003e\n\u003cdiv class=\"feat-icon\"\u003e📏\u003c\/div\u003e\n\u003cdiv class=\"feat-label\"\u003eCompact: 60L\u003c\/div\u003e\n\u003cdiv class=\"feat-value\"\u003eØ434 × 741mm\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-feat\"\u003e\n\u003cdiv class=\"feat-icon\"\u003e🔩\u003c\/div\u003e\n\u003cdiv class=\"feat-label\"\u003eWall Brackets\u003c\/div\u003e\n\u003cdiv class=\"feat-value\"\u003eIncluded\u003c\/div\u003e\n\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Intro box --\u003e\n  \u003cdiv class=\"oso-buf-intro-box\"\u003e\n    \u003cp\u003e\u003cstrong\u003eOSO ACCU A60 — 60L Stainless Steel Buffer Tank for Heat Pumps (SKU 11009165)\u003c\/strong\u003e — 60L (57L actual volume) stainless steel buffer tank  |  NANOPUR insulation  |  Dual flow\/return connections  |  Hydraulic coupling \u0026amp; balancing  |  Anti-clocking protection  |  Cool storage function  |  G½\" air vent + drain  |  Wall brackets included  |  Ø434 × 741mm  |  18 kg  |  ErP C\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Why a buffer tank box --\u003e\n  \u003cdiv class=\"oso-buf-why-box\"\u003e\n    \u003cstrong style=\"color:#856404\"\u003eℹ️ Why does my heat pump need a buffer tank?\u003c\/strong\u003e\n    \u003cp style=\"margin:0.3rem 0 0;color:#5a3a00\"\u003eMost air source heat pumps require a minimum flow rate to operate correctly — without sufficient water volume in the system, the heat pump can \"clock\" (short-cycle on and off repeatedly), which reduces efficiency, increases wear and can shorten compressor life. A buffer tank adds volume to the system so the heat pump always has adequate water to heat, allowing it to run in longer, more efficient cycles. A buffer tank is also essential for \u003cstrong\u003edefrost mode\u003c\/strong\u003e — the tank provides the heat energy the pump needs to defrost its evaporator — and for \u003cstrong\u003ecooling\/heating systems\u003c\/strong\u003e where the buffer stores cooled water during summer operation.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cp\u003eThe \u003cstrong\u003eOSO ACCU A60\u003c\/strong\u003e is a 60-litre stainless steel buffer tank designed for use with air source heat pumps and solar thermal systems. Built from OSO's EVERLAST™ titanium-alloyed stainless steel and welded using the ULTRAWELD™ process, it is inherently corrosion-resistant — unlike mild steel buffer tanks, it requires no sacrificial anode and no periodic re-pressurisation of protective coatings. NANOPUR insulation ensures minimal standby heat loss (44W) to keep the buffer volume at the right temperature with minimal energy input.\u003c\/p\u003e\n  \u003cp\u003eThe A60 is the most compact tank in the OSO ACCU range, suited to smaller heat pump installations or where space is limited. Its slimline Ø434mm footprint allows it to fit alongside most domestic heat pump units in standard plant rooms, cupboards or utility spaces. Wall brackets are included, allowing the tank to be mounted on a wall where floor space is at an absolute premium — though it can equally stand on the floor.\u003c\/p\u003e\n\n  \u003ch2\u003eKey Features\u003c\/h2\u003e\n  \u003cdiv class=\"oso-buf-grid\"\u003e\n    \u003cdiv class=\"oso-buf-card\"\u003e\n\u003cstrong\u003eHydraulic Coupling \u0026amp; Balancing\u003c\/strong\u003eActs as a hydraulic separator between the heat pump's primary circuit and the heating distribution circuit — decoupling the two so the heat pump can maintain its minimum flow rate independently of the variable demand from the heating zones.\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-card\"\u003e\n\u003cstrong\u003eAnti-Clocking Protection\u003c\/strong\u003eAdds essential system volume so the heat pump runs in longer, more efficient cycles rather than short-cycling repeatedly. Protects compressor longevity and keeps COP consistently high.\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-card\"\u003e\n\u003cstrong\u003eDefrost Mode Heat Reserve\u003c\/strong\u003eProvides the thermal mass the heat pump needs to complete a defrost cycle without drawing energy from the heating distribution circuit — critical for reliable operation in colder ambient conditions.\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-card\"\u003e\n\u003cstrong\u003eCool Storage Function\u003c\/strong\u003eFor heating-cooling heat pump systems, the buffer tank stores cooled water for space cooling while the heat pump simultaneously heats a DHW cylinder — enabling both functions without conflicting demands on the refrigeration circuit.\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-card\"\u003e\n\u003cstrong\u003eNANOPUR™ Insulation\u003c\/strong\u003eClass-leading insulation technology with thermal performance far surpassing standard Pentane foam — keeps the buffer volume at temperature with minimal standby losses (44W), reducing the energy cost of maintaining system readiness.\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-card\"\u003e\n\u003cstrong\u003eEVERLAST™ Stainless Steel \u0026amp; ULTRAWELD™\u003c\/strong\u003eTitanium-alloyed stainless steel provides class-leading corrosion resistance. The ULTRAWELD™ welding system and passivation process ensure a sealed, durable tank construction — over 40% lighter than equivalent enamelled steel tanks.\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-card\"\u003e\n\u003cstrong\u003eDual Flow\/Return Connections\u003c\/strong\u003eDual sets of flow and return connections on opposite sides of the tank provide flexible connection and installation options for a variety of primary and secondary circuit configurations.\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-card\"\u003e\n\u003cstrong\u003eWall Brackets \u0026amp; Air Vent Included\u003c\/strong\u003eCorrosion-resistant wall brackets for vertical wall mounting are included. A separate G½\" female connection for an automatic air vent, plus a drain connection, are factory-fitted for installation convenience.\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n  \u003ctable class=\"oso-buf-spec-table\"\u003e\n    \u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBrand \/ Range\u003c\/td\u003e\n\u003ctd\u003eOSO Hotwater \/ ACCU\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eACCU A60\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSKU \/ Product No.\u003c\/td\u003e\n\u003ctd\u003e11009165\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eActual Volume\u003c\/td\u003e\n\u003ctd\u003e57 litres\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eNominal Capacity\u003c\/td\u003e\n\u003ctd\u003e60 litres\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eEnergy Rating (ErP)\u003c\/td\u003e\n\u003ctd\u003eC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eStandby Heat Loss\u003c\/td\u003e\n\u003ctd\u003e44W\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTank Material\u003c\/td\u003e\n\u003ctd\u003eEVERLAST™ titanium-alloyed stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eULTRAWELD™ — no enamel, no anode required\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eInsulation\u003c\/td\u003e\n\u003ctd\u003eNANOPUR™\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDiameter (Ø)\u003c\/td\u003e\n\u003ctd\u003e434mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHeight (H)\u003c\/td\u003e\n\u003ctd\u003e741mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eWeight (empty)\u003c\/td\u003e\n\u003ctd\u003e18 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eFreight Volume\u003c\/td\u003e\n\u003ctd\u003e0.18 dm³\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePlacement\u003c\/td\u003e\n\u003ctd\u003eFloor-standing (wall-mountable with included brackets)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eFlow\/Return Connections\u003c\/td\u003e\n\u003ctd\u003eDual sets — flexible configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAir Vent Connection\u003c\/td\u003e\n\u003ctd\u003eG½\" F (separate)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDrain Connection\u003c\/td\u003e\n\u003ctd\u003eYes — factory fitted\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSensor Pocket\u003c\/td\u003e\n\u003ctd\u003e1× for 6–8mm sensor\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eWall Brackets\u003c\/td\u003e\n\u003ctd\u003eIncluded (corrosion-resistant)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTypical Applications\u003c\/td\u003e\n\u003ctd\u003eAir source heat pumps, solar thermal, heating-cooling systems\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\n  \u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"oso-buf-faq-item\"\u003e\n\u003cstrong\u003eWhat size buffer tank do I need for my heat pump?\u003c\/strong\u003e\u003cp\u003eThe required buffer volume depends on the heat pump output, the number of heating zones, the minimum flow rate of the heat pump and the minimum on-cycle duration specified by the manufacturer. As a general guide, 20–50 litres per kW of heat pump output is a commonly used rule of thumb, though the correct sizing must be calculated for each installation. For a typical 5–10kW domestic heat pump with 2–3 zones, a 60L buffer is often sufficient; larger systems or fewer zones may require 100L or 200L. Always consult the heat pump manufacturer's guidance or MCS documentation for your specific system.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"oso-buf-faq-item\"\u003e\n\u003cstrong\u003eDoes a buffer tank replace the need for a hot water cylinder?\u003c\/strong\u003e\u003cp\u003eNo. A buffer tank stores heating system water (the circuit fluid) at heating temperatures — it is not a domestic hot water (DHW) cylinder. It is used in the primary heating circuit to stabilise heat pump operation. A separate unvented or vented DHW cylinder (or thermal store) is still required to provide hot water to taps and showers.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"oso-buf-faq-item\"\u003e\n\u003cstrong\u003eCan the OSO ACCU be wall-mounted?\u003c\/strong\u003e\u003cp\u003eYes. The A60 comes with corrosion-resistant wall brackets so it can be mounted vertically on a wall — useful in plant rooms or cupboards where floor space is restricted. The tank can equally stand on the floor; both installations are supported.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"oso-buf-faq-item\"\u003e\n\u003cstrong\u003eIs this tank suitable for underfloor heating systems?\u003c\/strong\u003e\u003cp\u003eYes. The OSO ACCU A60 is suitable for use with heat pumps connected to underfloor heating, radiators, fan coil units or any closed heating distribution system. Its dual flow\/return connections make it compatible with a wide variety of primary\/secondary piping configurations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":63667142033757,"sku":"ACCU A60","price":430.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OSOACCUA200200LStainlessSteelBufferTankforHeatPumps.webp?v=1772364921"},{"product_id":"oso-accu-a100-100l-stainless-steel-buffer-tank-for-heat-pumps","title":"OSO ACCU A100 100L Stainless Steel Buffer Tank for Heat Pumps","description":"\u003cstyle\u003e\n  .oso-buf-wrap{font-family:inherit;color:inherit;line-height:1.7;font-size:16px}\n  .oso-buf-wrap p,.oso-buf-wrap li,.oso-buf-wrap td,.oso-buf-wrap th{font-size:16px!important;line-height:1.7}\n  .oso-buf-wrap h2{font-size:22px!important;font-weight:700;color:#1a3a5c;border-bottom:3px solid #0077b6;padding-bottom:6px;margin:2rem 0 1rem;line-height:1.3}\n  .oso-buf-wrap p{margin:0 0 1rem}\n  .oso-buf-wrap ul{padding-left:1.5rem;margin:0 0 1rem}\n  .oso-buf-wrap ul li{margin-bottom:0.5rem}\n  .oso-buf-badge{display:inline-block;font-size:13px!important;font-weight:700;border-radius:4px;padding:2px 10px;margin-right:5px;margin-bottom:4px;vertical-align:middle}\n  .oso-buf-badge.blue{background:#0077b6;color:#fff}\n  .oso-buf-badge.navy{background:#1a3a5c;color:#fff}\n  .oso-buf-badge.green{background:#1a7a3c;color:#fff}\n  .oso-buf-badge.grey{background:#555;color:#fff}\n  .oso-buf-feature-strip{display:flex;flex-wrap:wrap;gap:0;border:1px solid #bde0f5;border-radius:8px;overflow:hidden;margin-bottom:1.5rem}\n  .oso-buf-feat{flex:1 1 110px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:0.85rem 0.5rem;background:#f0f8ff;border-right:1px solid #bde0f5;min-width:90px}\n  .oso-buf-feat:last-child{border-right:none}\n  .oso-buf-feat .feat-icon{font-size:24px;margin-bottom:0.3rem;line-height:1}\n  .oso-buf-feat .feat-label{font-size:12px!important;font-weight:700;color:#1a3a5c;line-height:1.3;margin-bottom:0.15rem}\n  .oso-buf-feat .feat-value{font-size:11px!important;color:#555;line-height:1.3}\n  .oso-buf-intro-box{background:#e0f2fe;border-left:4px solid #0077b6;padding:1.1rem 1.4rem;border-radius:0 6px 6px 0;margin-bottom:1.5rem}\n  .oso-buf-intro-box p{margin:0!important}\n  .oso-buf-why-box{background:#fff3cd;border:1px solid #ffc107;border-radius:5px;padding:0.9rem 1.1rem;margin:0.8rem 0 1.2rem}\n  .oso-buf-spec-table{width:100%;border-collapse:collapse;margin-bottom:1.5rem}\n  .oso-buf-spec-table th{background:#1a3a5c;color:#fff!important;text-align:left;padding:0.7rem 1rem;font-weight:700;font-size:16px!important}\n  .oso-buf-spec-table td{padding:0.6rem 1rem;border-bottom:1px solid #bde0f5;vertical-align:top;font-size:16px!important}\n  .oso-buf-spec-table tr:nth-child(even) td{background:#e0f2fe}\n  .oso-buf-spec-table td:first-child{font-weight:600;color:#111;width:44%}\n  .oso-buf-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:0.85rem;margin-bottom:1.2rem}\n  .oso-buf-card{background:#e0f2fe;border:1px solid #90caf9;border-radius:6px;padding:1rem 1.1rem;line-height:1.6}\n  .oso-buf-card strong{display:block;color:#1a3a5c;margin-bottom:0.35rem;font-size:16px!important}\n  .oso-buf-faq-item{border-bottom:1px solid #bde0f5;padding:0.9rem 0}\n  .oso-buf-faq-item:last-child{border-bottom:none}\n  .oso-buf-faq-item strong{color:#1a3a5c;font-size:16px!important;display:block;margin-bottom:0.3rem}\n\u003c\/style\u003e\n\u003cdiv class=\"oso-buf-wrap\"\u003e\n\n  \u003cdiv style=\"margin-bottom:1rem\"\u003e\n    \u003cspan class=\"oso-buf-badge blue\"\u003eOSO ACCU A100\u003c\/span\u003e\n    \u003cspan class=\"oso-buf-badge navy\"\u003e100 Litres\u003c\/span\u003e\n    \u003cspan class=\"oso-buf-badge green\"\u003eStainless Steel\u003c\/span\u003e\n    \u003cspan class=\"oso-buf-badge grey\"\u003eNANOPUR Insulation\u003c\/span\u003e\n    \u003cspan class=\"oso-buf-badge grey\"\u003eSKU 11003162\u003c\/span\u003e\n    \u003cspan class=\"oso-buf-badge grey\"\u003eErP B\u003c\/span\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"oso-buf-feature-strip\"\u003e\n    \u003cdiv class=\"oso-buf-feat\"\u003e\n\u003cdiv class=\"feat-icon\"\u003e🏗️\u003c\/div\u003e\n\u003cdiv class=\"feat-label\"\u003eStainless Steel\u003c\/div\u003e\n\u003cdiv class=\"feat-value\"\u003eEVERLAST™ titanium alloy\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-feat\"\u003e\n\u003cdiv class=\"feat-icon\"\u003e🌡️\u003c\/div\u003e\n\u003cdiv class=\"feat-label\"\u003eNANOPUR Insulation\u003c\/div\u003e\n\u003cdiv class=\"feat-value\"\u003eClass-leading retention\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-feat\"\u003e\n\u003cdiv class=\"feat-icon\"\u003e🔄\u003c\/div\u003e\n\u003cdiv class=\"feat-label\"\u003eDual Connections\u003c\/div\u003e\n\u003cdiv class=\"feat-value\"\u003eFlow + return both sides\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-feat\"\u003e\n\u003cdiv class=\"feat-icon\"\u003e🛡️\u003c\/div\u003e\n\u003cdiv class=\"feat-label\"\u003eAnti-Clocking\u003c\/div\u003e\n\u003cdiv class=\"feat-value\"\u003eProtects heat pump\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-feat\"\u003e\n\u003cdiv class=\"feat-icon\"\u003e📏\u003c\/div\u003e\n\u003cdiv class=\"feat-label\"\u003e100L Mid-Range\u003c\/div\u003e\n\u003cdiv class=\"feat-value\"\u003eØ434 × 1,168mm\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-feat\"\u003e\n\u003cdiv class=\"feat-icon\"\u003e🔩\u003c\/div\u003e\n\u003cdiv class=\"feat-label\"\u003eWall Brackets\u003c\/div\u003e\n\u003cdiv class=\"feat-value\"\u003eIncluded\u003c\/div\u003e\n\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"oso-buf-intro-box\"\u003e\n    \u003cp\u003e\u003cstrong\u003eOSO ACCU A100 — 100L Stainless Steel Buffer Tank for Heat Pumps (SKU 11003162)\u003c\/strong\u003e — 100L stainless steel buffer tank  |  NANOPUR insulation  |  ErP B  |  Dual flow\/return connections  |  Hydraulic coupling \u0026amp; balancing  |  Anti-clocking protection  |  Cool storage function  |  G½\" air vent + drain  |  Wall brackets included  |  Ø434 × 1,168mm  |  28 kg\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"oso-buf-why-box\"\u003e\n    \u003cstrong style=\"color:#856404\"\u003eℹ️ Why does my heat pump need a buffer tank?\u003c\/strong\u003e\n    \u003cp style=\"margin:0.3rem 0 0;color:#5a3a00\"\u003eMost air source heat pumps require a minimum flow rate to operate correctly. Without sufficient water volume, the pump can \"clock\" (short-cycle), reducing efficiency and increasing compressor wear. A buffer tank adds volume so the heat pump runs in longer, more efficient cycles. The buffer also provides the thermal mass for defrost cycles and, in heating-cooling systems, stores cooled water during summer operation. The 100L A100 suits heat pumps from approximately 5–12kW output in typical domestic systems.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cp\u003eThe \u003cstrong\u003eOSO ACCU A100\u003c\/strong\u003e is the mid-range 100-litre model in the OSO ACCU stainless steel buffer tank series. It shares the same Ø434mm diameter column as the A60, making it a natural upgrade when a system assessment calls for more volume — for instance, where the heat pump output is higher, where fewer heating zones reduce average flow rates, or where the installer wants additional thermal mass for improved defrost performance.\u003c\/p\u003e\n  \u003cp\u003eConstructed from EVERLAST™ titanium-alloyed stainless steel with ULTRAWELD™ manufacturing and NANOPUR™ insulation, the A100 is inherently corrosion-free and requires no magnesium anode, no periodic recoating and no anti-freeze. Its ErP B energy rating confirms low standby losses (55W), ensuring the stored system volume stays at temperature with minimal energy input between heat pump cycles.\u003c\/p\u003e\n\n  \u003ch2\u003eKey Features\u003c\/h2\u003e\n  \u003cdiv class=\"oso-buf-grid\"\u003e\n    \u003cdiv class=\"oso-buf-card\"\u003e\n\u003cstrong\u003eHydraulic Coupling \u0026amp; Balancing\u003c\/strong\u003eDecouples the heat pump primary circuit from the heating distribution circuit, allowing the heat pump to maintain its required minimum flow rate independently of variable demand from individual heating zones.\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-card\"\u003e\n\u003cstrong\u003eAnti-Clocking Protection\u003c\/strong\u003e100L of additional system volume prevents the heat pump from short-cycling — keeping compressor run times long, COP consistently high and wear to a minimum.\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-card\"\u003e\n\u003cstrong\u003eDefrost Heat Reserve\u003c\/strong\u003eProvides sufficient thermal mass for the heat pump to complete a full defrost cycle without drawing energy away from the heating circuit — critical for reliable cold-climate performance.\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-card\"\u003e\n\u003cstrong\u003eCool Storage for Heating-Cooling Systems\u003c\/strong\u003eStores cooled water during summer cooling mode so the heat pump can simultaneously heat a DHW cylinder without the two functions conflicting on the refrigeration circuit.\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-card\"\u003e\n\u003cstrong\u003eNANOPUR™ Insulation · ErP B\u003c\/strong\u003eClass-leading insulation maintains stored water temperature with standby losses of just 55W. ErP B rating confirms compliance with current energy efficiency regulations for buffer vessels.\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-card\"\u003e\n\u003cstrong\u003eEVERLAST™ Stainless Steel · ULTRAWELD™\u003c\/strong\u003eTitanium-alloyed stainless steel with OSO's unique ULTRAWELD welding process and passivation — no enamel lining, no sacrificial anode, inherently corrosion-resistant. Over 40% lighter than enamelled alternatives.\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-card\"\u003e\n\u003cstrong\u003eDual Flow\/Return Connections\u003c\/strong\u003eTwo complete sets of flow and return connections on opposite sides provide flexible primary\/secondary piping options to suit various system layouts.\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-card\"\u003e\n\u003cstrong\u003eWall Brackets \u0026amp; Drain Included\u003c\/strong\u003eCorrosion-resistant wall brackets for wall-mounted installation supplied. G½\" F air vent connection and drain point factory-fitted. Sensor pocket for a 6–8mm probe included.\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n  \u003ctable class=\"oso-buf-spec-table\"\u003e\n    \u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBrand \/ Range\u003c\/td\u003e\n\u003ctd\u003eOSO Hotwater \/ ACCU\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eACCU A100\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSKU \/ Product No.\u003c\/td\u003e\n\u003ctd\u003e11003162\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eVolume\u003c\/td\u003e\n\u003ctd\u003e100 litres\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eEnergy Rating (ErP)\u003c\/td\u003e\n\u003ctd\u003eB\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eStandby Heat Loss\u003c\/td\u003e\n\u003ctd\u003e55W\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTank Material\u003c\/td\u003e\n\u003ctd\u003eEVERLAST™ titanium-alloyed stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eULTRAWELD™ — no enamel, no anode required\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eInsulation\u003c\/td\u003e\n\u003ctd\u003eNANOPUR™\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDiameter (Ø)\u003c\/td\u003e\n\u003ctd\u003e434mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHeight (H)\u003c\/td\u003e\n\u003ctd\u003e1,168mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eWeight (empty)\u003c\/td\u003e\n\u003ctd\u003e28 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eFreight Volume\u003c\/td\u003e\n\u003ctd\u003e0.27 dm³\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePlacement\u003c\/td\u003e\n\u003ctd\u003eFloor-standing (wall-mountable with included brackets)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eFlow\/Return Connections\u003c\/td\u003e\n\u003ctd\u003eDual sets — flexible configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAir Vent Connection\u003c\/td\u003e\n\u003ctd\u003eG½\" F (separate)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDrain Connection\u003c\/td\u003e\n\u003ctd\u003eYes — factory fitted\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSensor Pocket\u003c\/td\u003e\n\u003ctd\u003e1× for 6–8mm sensor\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eWall Brackets\u003c\/td\u003e\n\u003ctd\u003eIncluded (corrosion-resistant)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTypical Applications\u003c\/td\u003e\n\u003ctd\u003eAir source heat pumps 5–12kW, solar thermal, heating-cooling systems\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\n  \u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"oso-buf-faq-item\"\u003e\n\u003cstrong\u003eWhen would I choose the 100L over the 60L buffer tank?\u003c\/strong\u003e\u003cp\u003eThe 100L A100 is appropriate where the heat pump output is higher (typically 7kW+), where the distribution system has fewer zones and therefore a higher risk of low flow rates during part-load operation, or where the installer wants additional thermal mass for more reliable defrost performance in cold climates. As a rough guide, 20–50L per kW of heat pump output is a common sizing approach — for an 8kW heat pump, 100L sits comfortably in range. Always refer to the heat pump manufacturer's minimum buffer volume specification and any MCS system sizing guidance.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"oso-buf-faq-item\"\u003e\n\u003cstrong\u003eDoes the A100 need an inhibitor or anti-freeze?\u003c\/strong\u003e\u003cp\u003eNo inhibitor or anti-freeze is required by the tank itself — the stainless steel construction is inherently corrosion-resistant. However, your heat pump's primary circuit may require a suitable inhibitor or glycol mixture per the heat pump manufacturer's instructions. Always follow the heat pump manufacturer's guidance on system water treatment.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"oso-buf-faq-item\"\u003e\n\u003cstrong\u003eCan this buffer tank be used with a ground source heat pump?\u003c\/strong\u003e\u003cp\u003eYes. The OSO ACCU A100 is compatible with any closed heating circuit — air source, ground source, solar thermal or hybrid systems. Its dual connections and neutral stainless steel construction make it suitable for use with all common system inhibitors and glycol concentrations.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"oso-buf-faq-item\"\u003e\n\u003cstrong\u003eDoes a buffer tank need servicing?\u003c\/strong\u003e\u003cp\u003eThe OSO ACCU stainless steel buffer tanks require minimal maintenance — there is no anode to replace, no enamel to inspect and no re-pressurisation of linings. Annual visual inspection of connections, the drain, and the air vent for leaks or corrosion is recommended as part of an annual heat pump service. System inhibitor concentrations should be checked annually per the heat pump manufacturer's schedule.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":63667187351901,"sku":"ACCU A100","price":590.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OSOACCUA100StainlessSteelBufferTankforHeatPumps.webp?v=1772363049"},{"product_id":"oso-accu-a200-200l-stainless-steel-buffer-tank-for-heat-pumps","title":"OSO ACCU A200 200L Stainless Steel Buffer Tank for Heat Pumps","description":"\u003cstyle\u003e\n  .oso-buf-wrap{font-family:inherit;color:inherit;line-height:1.7;font-size:16px}\n  .oso-buf-wrap p,.oso-buf-wrap li,.oso-buf-wrap td,.oso-buf-wrap th{font-size:16px!important;line-height:1.7}\n  .oso-buf-wrap h2{font-size:22px!important;font-weight:700;color:#1a3a5c;border-bottom:3px solid #0077b6;padding-bottom:6px;margin:2rem 0 1rem;line-height:1.3}\n  .oso-buf-wrap p{margin:0 0 1rem}\n  .oso-buf-wrap ul{padding-left:1.5rem;margin:0 0 1rem}\n  .oso-buf-wrap ul li{margin-bottom:0.5rem}\n  .oso-buf-badge{display:inline-block;font-size:13px!important;font-weight:700;border-radius:4px;padding:2px 10px;margin-right:5px;margin-bottom:4px;vertical-align:middle}\n  .oso-buf-badge.blue{background:#0077b6;color:#fff}\n  .oso-buf-badge.navy{background:#1a3a5c;color:#fff}\n  .oso-buf-badge.green{background:#1a7a3c;color:#fff}\n  .oso-buf-badge.grey{background:#555;color:#fff}\n  .oso-buf-feature-strip{display:flex;flex-wrap:wrap;gap:0;border:1px solid #bde0f5;border-radius:8px;overflow:hidden;margin-bottom:1.5rem}\n  .oso-buf-feat{flex:1 1 110px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:0.85rem 0.5rem;background:#f0f8ff;border-right:1px solid #bde0f5;min-width:90px}\n  .oso-buf-feat:last-child{border-right:none}\n  .oso-buf-feat .feat-icon{font-size:24px;margin-bottom:0.3rem;line-height:1}\n  .oso-buf-feat .feat-label{font-size:12px!important;font-weight:700;color:#1a3a5c;line-height:1.3;margin-bottom:0.15rem}\n  .oso-buf-feat .feat-value{font-size:11px!important;color:#555;line-height:1.3}\n  .oso-buf-intro-box{background:#e0f2fe;border-left:4px solid #0077b6;padding:1.1rem 1.4rem;border-radius:0 6px 6px 0;margin-bottom:1.5rem}\n  .oso-buf-intro-box p{margin:0!important}\n  .oso-buf-why-box{background:#fff3cd;border:1px solid #ffc107;border-radius:5px;padding:0.9rem 1.1rem;margin:0.8rem 0 1.2rem}\n  .oso-buf-spec-table{width:100%;border-collapse:collapse;margin-bottom:1.5rem}\n  .oso-buf-spec-table th{background:#1a3a5c;color:#fff!important;text-align:left;padding:0.7rem 1rem;font-weight:700;font-size:16px!important}\n  .oso-buf-spec-table td{padding:0.6rem 1rem;border-bottom:1px solid #bde0f5;vertical-align:top;font-size:16px!important}\n  .oso-buf-spec-table tr:nth-child(even) td{background:#e0f2fe}\n  .oso-buf-spec-table td:first-child{font-weight:600;color:#111;width:44%}\n  .oso-buf-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:0.85rem;margin-bottom:1.2rem}\n  .oso-buf-card{background:#e0f2fe;border:1px solid #90caf9;border-radius:6px;padding:1rem 1.1rem;line-height:1.6}\n  .oso-buf-card strong{display:block;color:#1a3a5c;margin-bottom:0.35rem;font-size:16px!important}\n  .oso-buf-faq-item{border-bottom:1px solid #bde0f5;padding:0.9rem 0}\n  .oso-buf-faq-item:last-child{border-bottom:none}\n  .oso-buf-faq-item strong{color:#1a3a5c;font-size:16px!important;display:block;margin-bottom:0.3rem}\n\u003c\/style\u003e\n\u003cdiv class=\"oso-buf-wrap\"\u003e\n\n  \u003cdiv style=\"margin-bottom:1rem\"\u003e\n    \u003cspan class=\"oso-buf-badge blue\"\u003eOSO ACCU A200\u003c\/span\u003e\n    \u003cspan class=\"oso-buf-badge navy\"\u003e200 Litres\u003c\/span\u003e\n    \u003cspan class=\"oso-buf-badge green\"\u003eStainless Steel\u003c\/span\u003e\n    \u003cspan class=\"oso-buf-badge grey\"\u003eNANOPUR Insulation\u003c\/span\u003e\n    \u003cspan class=\"oso-buf-badge grey\"\u003eSKU 11009745\u003c\/span\u003e\n    \u003cspan class=\"oso-buf-badge grey\"\u003eErP B\u003c\/span\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"oso-buf-feature-strip\"\u003e\n    \u003cdiv class=\"oso-buf-feat\"\u003e\n\u003cdiv class=\"feat-icon\"\u003e🏗️\u003c\/div\u003e\n\u003cdiv class=\"feat-label\"\u003eStainless Steel\u003c\/div\u003e\n\u003cdiv class=\"feat-value\"\u003eEVERLAST™ titanium alloy\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-feat\"\u003e\n\u003cdiv class=\"feat-icon\"\u003e🌡️\u003c\/div\u003e\n\u003cdiv class=\"feat-label\"\u003eNANOPUR Insulation\u003c\/div\u003e\n\u003cdiv class=\"feat-value\"\u003eClass-leading retention\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-feat\"\u003e\n\u003cdiv class=\"feat-icon\"\u003e🔄\u003c\/div\u003e\n\u003cdiv class=\"feat-label\"\u003eDual Connections\u003c\/div\u003e\n\u003cdiv class=\"feat-value\"\u003eFlow + return both sides\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-feat\"\u003e\n\u003cdiv class=\"feat-icon\"\u003e🛡️\u003c\/div\u003e\n\u003cdiv class=\"feat-label\"\u003eAnti-Clocking\u003c\/div\u003e\n\u003cdiv class=\"feat-value\"\u003eProtects heat pump\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-feat\"\u003e\n\u003cdiv class=\"feat-icon\"\u003e📏\u003c\/div\u003e\n\u003cdiv class=\"feat-label\"\u003e200L Largest\u003c\/div\u003e\n\u003cdiv class=\"feat-value\"\u003eØ595 × 1,265mm\u003c\/div\u003e\n\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-feat\"\u003e\n\u003cdiv class=\"feat-icon\"\u003e🔩\u003c\/div\u003e\n\u003cdiv class=\"feat-label\"\u003eWall Brackets\u003c\/div\u003e\n\u003cdiv class=\"feat-value\"\u003eIncluded\u003c\/div\u003e\n\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"oso-buf-intro-box\"\u003e\n    \u003cp\u003e\u003cstrong\u003eOSO ACCU A200 — 200L Stainless Steel Buffer Tank for Heat Pumps (SKU 11009745)\u003c\/strong\u003e — 199L (nominal 200L) stainless steel buffer tank  |  NANOPUR insulation  |  ErP B  |  Dual flow\/return connections  |  Hydraulic coupling \u0026amp; balancing  |  Anti-clocking protection  |  Cool storage function  |  G½\" air vent + drain  |  Wall brackets included  |  Ø595 × 1,265mm  |  39 kg\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"oso-buf-why-box\"\u003e\n    \u003cstrong style=\"color:#856404\"\u003eℹ️ Why does my heat pump need a buffer tank?\u003c\/strong\u003e\n    \u003cp style=\"margin:0.3rem 0 0;color:#5a3a00\"\u003eMost air source heat pumps require a minimum flow rate to operate correctly. Without sufficient water volume, the pump can \"clock\" (short-cycle on and off), reducing efficiency and increasing compressor wear. A buffer tank adds system volume so the heat pump runs in longer, more efficient cycles. The buffer also supplies the heat energy required for defrost cycles and, for heating-cooling systems, stores cooled water during summer operation. The 200L A200 is designed for larger or more demanding systems — particularly useful for heat pumps above 10kW, whole-house multi-zone systems, or commercial-grade residential installations.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cp\u003eThe \u003cstrong\u003eOSO ACCU A200\u003c\/strong\u003e is the largest model in the OSO ACCU domestic buffer tank range, providing 199 litres (nominal 200L) of system volume in a wider Ø595mm × 1,265mm column. Moving up to the larger diameter versus the A60\/A100's 434mm footprint means the A200 can be accommodated in most residential plant rooms while delivering substantially more thermal mass — reducing short-cycling risk even on larger heat pumps running at partial load across a multi-zone system.\u003c\/p\u003e\n  \u003cp\u003eLike all ACCU tanks, the A200 is built from EVERLAST™ titanium-alloyed stainless steel with ULTRAWELD™ construction and NANOPUR™ insulation — no enamel lining, no sacrificial anode, no periodic maintenance of protective coatings. Its ErP B rating confirms efficient standby performance (46W heat loss), and the dual flow\/return connections on both sides offer the flexibility needed for complex primary\/secondary circuit arrangements found in larger systems.\u003c\/p\u003e\n\n  \u003ch2\u003eKey Features\u003c\/h2\u003e\n  \u003cdiv class=\"oso-buf-grid\"\u003e\n    \u003cdiv class=\"oso-buf-card\"\u003e\n\u003cstrong\u003eLarge 200L System Volume\u003c\/strong\u003eThe largest domestic ACCU buffer, providing 199L of system volume to prevent short-cycling in systems with high heat pump output or many independently controlled zones. Particularly effective on systems with 10kW+ heat pumps.\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-card\"\u003e\n\u003cstrong\u003eHydraulic Coupling \u0026amp; Balancing\u003c\/strong\u003eDecouples the heat pump primary circuit from the distribution circuit — ensuring the heat pump always sees its required minimum flow rate regardless of how many zones are actively calling for heat.\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-card\"\u003e\n\u003cstrong\u003eAnti-Clocking Protection\u003c\/strong\u003e200L of additional volume means even during very low demand periods (mild weather, single zone) the heat pump completes long, efficient cycles rather than short-cycling — protecting the compressor and keeping seasonal COP high.\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-card\"\u003e\n\u003cstrong\u003eDefrost Heat Reserve\u003c\/strong\u003eProvides abundant thermal mass for the heat pump to complete defrost cycles without drawing energy from the heating circuit — especially important for systems in exposed locations or at high altitude where defrost frequency is higher.\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-card\"\u003e\n\u003cstrong\u003eCool Storage for Heating-Cooling Systems\u003c\/strong\u003eFor reversible heat pump systems, the A200 stores cooled water during summer cooling operation while the heat pump simultaneously services DHW heating — the larger volume extends the useful cooling window between compressor cycles.\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-card\"\u003e\n\u003cstrong\u003eNANOPUR™ Insulation · ErP B · 46W Losses\u003c\/strong\u003eDespite its larger volume, standby heat loss is just 46W — lower than the 100L model's 55W in absolute terms, demonstrating the efficiency benefit of NANOPUR insulation at larger diameter. ErP B compliant.\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-card\"\u003e\n\u003cstrong\u003eEVERLAST™ Stainless Steel · ULTRAWELD™\u003c\/strong\u003eTitanium-alloyed stainless steel with OSO's ULTRAWELD welding process — no enamel to crack, no anode to replace, no corrosion. Over 40% lighter than equivalent enamelled buffer tanks. Designed for a full service lifetime without relining.\u003c\/div\u003e\n    \u003cdiv class=\"oso-buf-card\"\u003e\n\u003cstrong\u003eDual Flow\/Return Connections\u003c\/strong\u003eTwo complete sets of flow and return connections provide maximum flexibility for primary and secondary circuit layouts in complex multi-zone systems. G½\" air vent connection and drain point factory-fitted.\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n  \u003ctable class=\"oso-buf-spec-table\"\u003e\n    \u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBrand \/ Range\u003c\/td\u003e\n\u003ctd\u003eOSO Hotwater \/ ACCU\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eACCU A200\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSKU \/ Product No.\u003c\/td\u003e\n\u003ctd\u003e11009745\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eActual Volume\u003c\/td\u003e\n\u003ctd\u003e199 litres\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eNominal Capacity\u003c\/td\u003e\n\u003ctd\u003e200 litres\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eEnergy Rating (ErP)\u003c\/td\u003e\n\u003ctd\u003eB\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eStandby Heat Loss\u003c\/td\u003e\n\u003ctd\u003e46W\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTank Material\u003c\/td\u003e\n\u003ctd\u003eEVERLAST™ titanium-alloyed stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eULTRAWELD™ — no enamel, no anode required\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eInsulation\u003c\/td\u003e\n\u003ctd\u003eNANOPUR™\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDiameter (Ø)\u003c\/td\u003e\n\u003ctd\u003e595mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHeight (H)\u003c\/td\u003e\n\u003ctd\u003e1,265mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eWeight (empty)\u003c\/td\u003e\n\u003ctd\u003e39 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eFreight Volume\u003c\/td\u003e\n\u003ctd\u003e0.48 dm³\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePlacement\u003c\/td\u003e\n\u003ctd\u003eFloor-standing (wall-mountable with included brackets)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eFlow\/Return Connections\u003c\/td\u003e\n\u003ctd\u003eDual sets — flexible configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAir Vent Connection\u003c\/td\u003e\n\u003ctd\u003eG½\" F (separate)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDrain Connection\u003c\/td\u003e\n\u003ctd\u003eYes — factory fitted\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSensor Pocket\u003c\/td\u003e\n\u003ctd\u003e1× for 6–8mm sensor\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eWall Brackets\u003c\/td\u003e\n\u003ctd\u003eIncluded (corrosion-resistant)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTypical Applications\u003c\/td\u003e\n\u003ctd\u003eAir source heat pumps 10kW+, multi-zone systems, ground source, solar thermal, commercial-grade residential\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\n  \u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"oso-buf-faq-item\"\u003e\n\u003cstrong\u003eWhen would I choose the 200L over the 60L or 100L buffer tank?\u003c\/strong\u003e\u003cp\u003eThe 200L A200 is appropriate for heat pump systems with outputs of approximately 10kW or more, multi-zone systems where many zones may be closed simultaneously (giving low overall flow rates during mild weather), or where the installer wants additional defrost margin for installations in colder or more exposed locations. As a general rule, 20–50L per kW of heat pump output is a common starting point for buffer sizing, though the exact volume must be calculated based on the specific heat pump's minimum flow rate, the minimum on-cycle time and the distribution system design. Always consult the heat pump manufacturer's documentation or an MCS-accredited designer.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"oso-buf-faq-item\"\u003e\n\u003cstrong\u003eWhy is the A200's heat loss (46W) lower than the A100's (55W) despite being bigger?\u003c\/strong\u003e\u003cp\u003eThis is a function of the surface-area-to-volume ratio and the NANOPUR insulation thickness. As a buffer tank gets larger in diameter, proportionally more volume is enclosed within the same insulated surface area — so the larger tank is actually more thermally efficient per litre of stored volume. The A200's larger Ø595mm diameter (versus 434mm for A60\/A100) makes it inherently better insulated in relative terms.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"oso-buf-faq-item\"\u003e\n\u003cstrong\u003eCan the A200 be used with a ground source heat pump?\u003c\/strong\u003e\u003cp\u003eYes. The OSO ACCU A200 is compatible with any closed heating circuit — air source, ground source, solar thermal or hybrid systems. Its dual connection configuration and stainless steel construction make it compatible with all common system inhibitors and glycol concentrations typically used in ground source systems.\u003c\/p\u003e\n\u003c\/div\u003e\n  \u003cdiv class=\"oso-buf-faq-item\"\u003e\n\u003cstrong\u003eIs this suitable for commercial applications?\u003c\/strong\u003e\u003cp\u003eThe A200 is designed primarily for larger domestic and light commercial installations. For higher-volume commercial buffer requirements, OSO also offers larger ACCU tanks (from 300L upward). If you are unsure which size buffer is appropriate for a commercial project, contact us for system design guidance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":63667353387357,"sku":"ACCU A200","price":850.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OSOACCUA6060LStainlessSteelBufferTankforHeatPumps.webp?v=1772364934"},{"product_id":"oso-acc130-superstream-130l-cold-water-accumulator-tank","title":"OSO Acc130 SuperStream 130L Cold Water Accumulator Tank","description":"\u003cstyle\u003e\n  .dw-wrap{font-family:inherit;color:inherit;line-height:1.7;font-size:16px}\n  .dw-wrap p,.dw-wrap li,.dw-wrap td,.dw-wrap th{font-size:16px!important;line-height:1.7}\n  .dw-wrap h2{font-size:22px!important;font-weight:700;color:#1a3a5c;border-bottom:3px solid #008377;padding-bottom:6px;margin:2rem 0 1rem;line-height:1.3}\n  .dw-wrap h3{font-size:17px!important;font-weight:700;color:#1a3a5c;margin:1.2rem 0 0.4rem;line-height:1.4}\n  .dw-wrap p{margin:0 0 1rem}\n  .dw-wrap ul{padding-left:1.5rem;margin:0 0 1rem}\n  .dw-wrap ul li{margin-bottom:0.5rem}\n  .dw-badge{display:inline-block;font-size:13px!important;font-weight:700;border-radius:4px;padding:2px 10px;margin-right:5px;margin-bottom:4px;vertical-align:middle}\n  .dw-badge.blue{background:#008377;color:#fff}\n  .dw-badge.navy{background:#1a3a5c;color:#fff}\n  .dw-badge.teal{background:#0d9488;color:#fff}\n  .dw-badge.green{background:#1a7a3c;color:#fff}\n  .dw-badge.grey{background:#555;color:#fff}\n  .dw-intro-box{background:#e0f2fe;border-left:4px solid #008377CF;padding:1.1rem 1.4rem;border-radius:0 6px 6px 0;margin-bottom:1.5rem}\n  .dw-intro-box p{margin:0!important}\n  .dw-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:0.85rem;margin-bottom:1.2rem}\n  .dw-card{background:#e0f2fe;border:1px solid #90caf9;border-radius:6px;padding:1rem 1.1rem;line-height:1.6}\n  .dw-card strong{display:block;color:#1a3a5c;margin-bottom:0.35rem;font-size:16px!important}\n  .dw-info-box{background:#f0fdf4;border:1px solid #86efac;border-radius:6px;padding:1rem 1.2rem;margin:1.2rem 0}\n  .dw-info-box p{margin:0 0 0.5rem!important;color:#065f46;font-weight:700}\n  .dw-comp-box{background:#fff3cd;border:1px solid #ffc107;border-radius:5px;padding:0.9rem 1.1rem;margin:0.8rem 0}\n  .dw-spec-table{width:100%;border-collapse:collapse;margin-bottom:1.5rem}\n  .dw-spec-table th{background:#1a3a5c;color:#fff!important;text-align:left;padding:0.7rem 1rem;font-weight:700;font-size:16px!important}\n  .dw-spec-table td{padding:0.6rem 1rem;border-bottom:1px solid #bde0f5;vertical-align:top;font-size:16px!important}\n  .dw-spec-table tr:nth-child(even) td{background:#e0f2fe}\n  .dw-spec-table td:first-child{font-weight:600;color:#111;width:44%}\n  .dw-faq-item{border-bottom:1px solid #bde0f5;padding:0.9rem 0}\n  .dw-faq-item:last-child{border-bottom:none}\n  .dw-faq-item strong{color:#1a3a5c;font-size:16px!important;display:block;margin-bottom:0.3rem}\n  .dw-contents-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:0.6rem;margin-bottom:1.2rem}\n  .dw-contents-item{background:#f0f9ff;border:1px solid #bde0f5;border-radius:5px;padding:0.6rem 0.9rem;font-size:15px!important}\n\u003c\/style\u003e\n\n\u003cdiv class=\"dw-wrap\"\u003e\n\n  \u003cdiv style=\"margin-bottom:1rem\"\u003e\n    \u003cspan class=\"dw-badge blue\"\u003e11007350\u003c\/span\u003e\n    \u003cspan class=\"dw-badge navy\"\u003eAcc130\u003c\/span\u003e\n    \u003cspan class=\"dw-badge teal\"\u003eSuperStream\u003c\/span\u003e\n    \u003cspan class=\"dw-badge green\"\u003e130 L\u003c\/span\u003e\n    \u003cspan class=\"dw-badge grey\"\u003eCold Water Accumulator\u003c\/span\u003e\n    \u003cspan class=\"dw-badge grey\"\u003ePower-Free Booster\u003c\/span\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-intro-box\"\u003e\n    \u003cp\u003e\u003cstrong\u003eOSO Acc130 SuperStream 130 L Accumulator\u003c\/strong\u003e — Patented power-free cold water booster using CAD2 diaphragm technology | Delivers up to ~80 l\/min extra flow | Silent, zero-energy, zero-maintenance solution for low-pressure mains | Lightweight composite tank | WRAS-approved butyl membrane | 5-year warranty | Requires Upstream Kit 22\/28 mm (sold separately) for installation\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-comp-box\"\u003e\n    \u003cstrong style=\"color:#856404\"\u003e✅ The ultimate green alternative to noisy, power-hungry booster pumps\u003c\/strong\u003e\n    \u003cp style=\"margin:0.3rem 0 0;color:#5a3a00\"\u003ePerfect for properties with poor mains (low flow\/pressure), multi-outlet demand, combi boilers, unvented cylinders or showers. No electricity = no running costs, no noise (0 dB), no servicing. Works flawlessly during power cuts. Expandable — add more units for even higher flow.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cp\u003eThe OSO SuperStream Acc130 is a game-changing cold water accumulator that solves one of the most common UK plumbing frustrations: weak flow and pressure drops when multiple taps\/showers are used at once. Traditional mains supplies often can't cope, especially in older properties, apartments, or areas with small incoming pipes\/shared supplies. The Acc130 changes that by storing potable water in a sealed hygienic chamber (virgin butyl diaphragm — WRAS ref 1501305) under a pre-charged air pressure. When demand exceeds incoming flow, the stored water is released automatically — supplementing the mains seamlessly and delivering powerful, consistent pressure without any intervention.\u003c\/p\u003e\n\n  \u003cp\u003eThanks to the patented CAD2 diaphragm design, it achieves this with zero moving parts, zero electricity, zero noise and zero maintenance for the entire 5-year warranty period. The composite fiberglass\/epoxy shell is immensely strong yet lightweight (only 16 kg empty), corrosion-proof, and easy to manoeuvre into lofts or cupboards. It's fully compliant with UK water regulations and provides a \"mini reservoir\" of clean drinking-quality water right where you need it most.\u003c\/p\u003e\n\n  \u003ch2\u003eWhat Makes the SuperStream Acc130 Special?\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003e100% Passive \u0026amp; Green\u003c\/strong\u003e — No pump, no power consumption, no CO₂ emissions, no electricity bills — truly sustainable boosting.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSilent Operation\u003c\/strong\u003e — Completely noiseless (unlike booster pumps at 50–70 dB), ideal for quiet homes or night-time use.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePatented CAD2 Technology\u003c\/strong\u003e — Controlled Action Diaphragm prevents waterlogging, ensures even pressure delivery, and maximises usable volume (~65 L effective at typical 1.5 bar differential).\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMulti-Outlet Performance\u003c\/strong\u003e — Eliminates pressure drops during simultaneous use — showers stay powerful, taps fill fast, combis recover quickly.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eNo Servicing Ever\u003c\/strong\u003e — No filters to clean, no seals to replace — fit and forget for 5+ years.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eLightweight \u0026amp; Durable\u003c\/strong\u003e — Composite construction resists corrosion far better than steel vessels; easy retrofit or new-build install.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eKey Features\u003c\/h2\u003e\n  \u003cdiv class=\"dw-grid\"\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eFlow Boost\u003c\/strong\u003eSupplements mains by up to ~80 l\/min — transforms poor supplies into high-performance.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eZero Energy \u0026amp; Noise\u003c\/strong\u003eFully passive — 0 dB, 0 W consumption, works in power cuts.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eHygienic \u0026amp; WRAS\u003c\/strong\u003eButyl diaphragm approved for potable water (WRAS 1501305).\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eComposite Shell\u003c\/strong\u003eFibreglass\/epoxy — lightweight (16 kg empty), non-corrosive, 5-year guarantee.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003ePre-Charged Air\u003c\/strong\u003eFactory 1.4 bar — adjustable on-site for optimal performance.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eExpandable System\u003c\/strong\u003eParallel install multiple units with add-on kits for commercial-level flow.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003ePatented Design\u003c\/strong\u003eUK patent protected (no. 2349908) — proven reliability since launch.\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n  \u003ctable class=\"dw-spec-table\"\u003e\n    \u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e11007350\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTotal Vessel Volume\u003c\/td\u003e\n\u003ctd\u003e130 litres\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eUsable Water Volume\u003c\/td\u003e\n\u003ctd\u003e~65 litres (at 1.5 bar differential pressure)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDimensions (Ø × Height)\u003c\/td\u003e\n\u003ctd\u003e418 × 1227 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eEmpty Weight\u003c\/td\u003e\n\u003ctd\u003e16 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eFull Weight (approx.)\u003c\/td\u003e\n\u003ctd\u003e81 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eConnections\u003c\/td\u003e\n\u003ctd\u003e1\" BSP male × 28 mm compression\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMax Working Pressure\u003c\/td\u003e\n\u003ctd\u003e8.6 bar (860 kPa)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePre-charge Pressure\u003c\/td\u003e\n\u003ctd\u003e1.4 bar (factory — adjustable)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMax Boost Head (closed valve)\u003c\/td\u003e\n\u003ctd\u003e4.3 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eWater Temperature Range\u003c\/td\u003e\n\u003ctd\u003e4 °C to 35 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAmbient Temperature Max\u003c\/td\u003e\n\u003ctd\u003e40 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMembrane Material\u003c\/td\u003e\n\u003ctd\u003eButyl rubber (WRAS 1501305)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTank Construction\u003c\/td\u003e\n\u003ctd\u003eContinuous strand fibreglass + epoxy resin\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e5 years (vessel \u0026amp; diaphragm)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\n  \u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n  \u003cdiv class=\"dw-contents-grid\"\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ 1 × Acc130 SuperStream Accumulator Vessel\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ 1\" BSP male to 28 mm compression fittings\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Pre-charge adjustment instructions\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Full installation \u0026amp; commissioning manual\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-info-box\"\u003e\n    \u003cp\u003e✅ Essential companion products: Upstream Kit 22\/28 mm (11007380) for first unit + Add-on Kit (11007327) for each extra accumulator. For very low pressure (\u0026lt;2 bar dynamic), pair with SuperStream Charger Pump (11007348).\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eDoes the Acc130 need electricity or a pump?\u003c\/strong\u003e\n    No — it's 100% passive with no moving parts, no power draw, and no noise. It boosts flow using stored pressure only.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eWhat flow\/pressure improvement can I expect?\u003c\/strong\u003e\n    Typically adds up to ~80 litres per minute of extra flow (subject to pipe sizing). Pressure remains stable even with multiple outlets open — ideal for power-shower performance without a shower pump.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eIs it suitable for drinking water?\u003c\/strong\u003e\n    Yes — the butyl membrane is WRAS approved (1501305) and the system stores wholesome potable water with no additives or treatment needed.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eHow long does the pre-charge last?\u003c\/strong\u003e\n    The air pre-charge is sealed and designed to last the life of the unit (5+ years). Periodic checks\/adjustments are simple if needed, but rarely required.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eCan I install multiple Acc130 units?\u003c\/strong\u003e\n    Yes — parallel connection is easy and recommended for very high demand (e.g. large homes, small commercial). Use one Upstream Kit for the first unit and Add-on Kits for each additional.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eDoes it work with unvented cylinders or combi boilers?\u003c\/strong\u003e\n    Perfectly — boosts both hot and cold services. Many customers use it to achieve reliable performance from combis or unvented systems on weak mains.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eWhat if my mains pressure is extremely low (\u0026lt;1 bar)?\u003c\/strong\u003e\n    For dynamic pressures below ~2 bar, combine with the optional SuperStream Charger Pump (11007348) to pre-boost incoming supply to ~3.5 bar — then let the accumulator handle peak demand.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eIs maintenance required?\u003c\/strong\u003e\n    None — no filters, no seals to replace, no annual service. Just install and enjoy reliable boosted flow for years.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eCan it be installed in any orientation?\u003c\/strong\u003e\n    Vertical mounting only for the Acc130. For horizontal options see Acc200\/250 models with cradle accessory.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":63694655684957,"sku":"Acc130","price":770.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OSOSuperStreamColdWaterAccumulatorTank.jpg?v=1772780702"},{"product_id":"oso-acc200-superstream-200l-cold-water-accumulator-tank","title":"OSO Acc200 SuperStream 200L Cold Water Accumulator Tank","description":"\u003cstyle\u003e\n  .dw-wrap{font-family:inherit;color:inherit;line-height:1.7;font-size:16px}\n  .dw-wrap p,.dw-wrap li,.dw-wrap td,.dw-wrap th{font-size:16px!important;line-height:1.7}\n  .dw-wrap h2{font-size:22px!important;font-weight:700;color:#1a3a5c;border-bottom:3px solid #008377;padding-bottom:6px;margin:2rem 0 1rem;line-height:1.3}\n  .dw-wrap h3{font-size:17px!important;font-weight:700;color:#1a3a5c;margin:1.2rem 0 0.4rem;line-height:1.4}\n  .dw-wrap p{margin:0 0 1rem}\n  .dw-wrap ul{padding-left:1.5rem;margin:0 0 1rem}\n  .dw-wrap ul li{margin-bottom:0.5rem}\n  .dw-badge{display:inline-block;font-size:13px!important;font-weight:700;border-radius:4px;padding:2px 10px;margin-right:5px;margin-bottom:4px;vertical-align:middle}\n  .dw-badge.blue{background:#008377;color:#fff}\n  .dw-badge.navy{background:#1a3a5c;color:#fff}\n  .dw-badge.teal{background:#0d9488;color:#fff}\n  .dw-badge.green{background:#1a7a3c;color:#fff}\n  .dw-badge.grey{background:#555;color:#fff}\n  .dw-intro-box{background:#e0f2fe;border-left:4px solid #008377CF;padding:1.1rem 1.4rem;border-radius:0 6px 6px 0;margin-bottom:1.5rem}\n  .dw-intro-box p{margin:0!important}\n  .dw-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:0.85rem;margin-bottom:1.2rem}\n  .dw-card{background:#e0f2fe;border:1px solid #90caf9;border-radius:6px;padding:1rem 1.1rem;line-height:1.6}\n  .dw-card strong{display:block;color:#1a3a5c;margin-bottom:0.35rem;font-size:16px!important}\n  .dw-info-box{background:#f0fdf4;border:1px solid #86efac;border-radius:6px;padding:1rem 1.2rem;margin:1.2rem 0}\n  .dw-info-box p{margin:0 0 0.5rem!important;color:#065f46;font-weight:700}\n  .dw-comp-box{background:#fff3cd;border:1px solid #ffc107;border-radius:5px;padding:0.9rem 1.1rem;margin:0.8rem 0}\n  .dw-spec-table{width:100%;border-collapse:collapse;margin-bottom:1.5rem}\n  .dw-spec-table th{background:#1a3a5c;color:#fff!important;text-align:left;padding:0.7rem 1rem;font-weight:700;font-size:16px!important}\n  .dw-spec-table td{padding:0.6rem 1rem;border-bottom:1px solid #bde0f5;vertical-align:top;font-size:16px!important}\n  .dw-spec-table tr:nth-child(even) td{background:#e0f2fe}\n  .dw-spec-table td:first-child{font-weight:600;color:#111;width:44%}\n  .dw-faq-item{border-bottom:1px solid #bde0f5;padding:0.9rem 0}\n  .dw-faq-item:last-child{border-bottom:none}\n  .dw-faq-item strong{color:#1a3a5c;font-size:16px!important;display:block;margin-bottom:0.3rem}\n  .dw-contents-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:0.6rem;margin-bottom:1.2rem}\n  .dw-contents-item{background:#f0f9ff;border:1px solid #bde0f5;border-radius:5px;padding:0.6rem 0.9rem;font-size:15px!important}\n\u003c\/style\u003e\n\n\u003cdiv class=\"dw-wrap\"\u003e\n\u003cdiv style=\"margin-bottom:1rem\"\u003e\n\u003cspan class=\"dw-badge blue\"\u003e11007351\u003c\/span\u003e\u003cspan class=\"dw-badge navy\"\u003eAcc200\u003c\/span\u003e\u003cspan class=\"dw-badge teal\"\u003eSuperStream\u003c\/span\u003e\u003cspan class=\"dw-badge green\"\u003e200 L\u003c\/span\u003e\u003cspan class=\"dw-badge grey\"\u003eCold Water Accumulator\u003c\/span\u003e\u003cspan class=\"dw-badge grey\"\u003ePower-Free Booster\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"dw-intro-box\"\u003e\u003cp\u003e\u003cstrong\u003eOSO Acc200 SuperStream 200 L Accumulator\u003c\/strong\u003e — Patented power-free cold Water Accumulator Tank booster with CAD2 diaphragm technology | Delivers up to ~80 l\/min extra flow | Silent, zero-energy, zero-maintenance solution for medium-demand homes | Lightweight composite tank | Horizontal or vertical install (horizontal requires cradle – sold separately) | WRAS-approved butyl membrane | 5-year warranty | Requires Upstream Kit 22\/28 mm (sold separately)\u003c\/p\u003e\u003c\/div\u003e\n\u003cdiv class=\"dw-comp-box\"\u003e\n\u003cstrong\u003e✅ Double the usable volume of the Acc130 – perfect for family homes or 2–3 bathroom properties\u003c\/strong\u003eProvides a larger “reserve” of boosted water for simultaneous use of multiple showers, baths, kitchen taps and appliances. No electricity = no running costs, no noise, no servicing. Expandable with additional units for even higher performance.\u003c\/div\u003e\n\u003cp\u003eThe OSO SuperStream Acc200 is the mid-range model in the acclaimed SuperStream series — designed specifically for properties where the Acc130’s 130 L capacity might be stretched during peak times (e.g. morning rush with 2 showers + kitchen running). It delivers the same revolutionary performance as the smaller unit but with double the total volume and approximately double the usable stored water (~100 L effective at 1.5 bar differential), giving noticeably longer high-flow periods before relying solely on incoming mains.\u003c\/p\u003e\n\u003cp\u003eLike all SuperStream accumulators, it uses the patented CAD2 (Controlled Action Diaphragm 2) technology: a food-grade butyl diaphragm separates stored potable water from a nitrogen-precharged air chamber. When demand exceeds supply, the diaphragm gently pushes stored water into the system — boosting flow and stabilising pressure without any pumps, electricity, noise or maintenance. The result is powerful, consistent performance across multiple outlets, even on weak or restricted mains supplies common in many UK homes.\u003c\/p\u003e\n\u003cp\u003eThe corrosion-proof composite fiberglass\/epoxy shell is exceptionally strong yet weighs only 22 kg empty — making it far easier to manoeuvre into lofts, cupboards or plant rooms than traditional steel vessels. A key advantage over the Acc130 is the option for horizontal mounting (using the dedicated Horizontal Cradle 11007329), which is invaluable in space-restricted installations.\u003c\/p\u003e\n\u003ch2\u003eWhat Makes the SuperStream Acc200 Special?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eZero Running Costs Forever\u003c\/strong\u003e — No electricity, no pump servicing, no filters — truly sustainable and budget-friendly long-term.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompletely Silent\u003c\/strong\u003e — 0 dB operation — perfect for bedrooms, quiet homes or night-time use (unlike booster pumps).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePatented CAD2 Diaphragm\u003c\/strong\u003e — Prevents waterlogging, delivers even pressure, maximises usable volume (~100 L effective).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHorizontal or Vertical Flexibility\u003c\/strong\u003e — Unique in the range — horizontal option saves valuable headroom in lofts\/cupboards (cradle required).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightweight \u0026amp; Corrosion-Proof\u003c\/strong\u003e — Composite construction outperforms steel tanks in longevity and ease of handling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExpandable to Any Size\u003c\/strong\u003e — Link multiple units in parallel for commercial-level flow without replacing the system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWRAS \u0026amp; Regulation Compliant\u003c\/strong\u003e — Butyl membrane (WRAS 1501305) safe for drinking water systems; fully meets UK water bylaws.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cdiv class=\"dw-grid\"\u003e\n\u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eHigh Flow Boost\u003c\/strong\u003eSupplements mains by up to ~80 l\/min — ideal for 2–3 simultaneous outlets.\u003c\/div\u003e\n\u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eZero Energy \u0026amp; Zero Noise\u003c\/strong\u003ePassive system — no power, no sound, performs in outages.\u003c\/div\u003e\n\u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eLarger Usable Reserve\u003c\/strong\u003e~100 L effective storage at typical differential — longer high-flow periods.\u003c\/div\u003e\n\u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eHorizontal Mounting Option\u003c\/strong\u003eUse with Cradle (11007329) for low-height spaces.\u003c\/div\u003e\n\u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eHygienic WRAS Membrane\u003c\/strong\u003eButyl rubber approved for potable water (ref 1501305).\u003c\/div\u003e\n\u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eComposite Construction\u003c\/strong\u003eFibreglass\/epoxy — 22 kg empty, corrosion-free, 5-year warranty.\u003c\/div\u003e\n\u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003ePre-Charge Adjustable\u003c\/strong\u003eFactory 1.4 bar — fine-tune on site for best results.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"dw-spec-table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e11007351\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Vessel Volume\u003c\/td\u003e\n\u003ctd\u003e200 litres\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUsable Water Volume\u003c\/td\u003e\n\u003ctd\u003e~100 litres (at 1.5 bar differential pressure)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (Ø × Height – vertical)\u003c\/td\u003e\n\u003ctd\u003e542 × 1098 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEmpty Weight\u003c\/td\u003e\n\u003ctd\u003e22 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFull Weight (approx.)\u003c\/td\u003e\n\u003ctd\u003e122 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnections\u003c\/td\u003e\n\u003ctd\u003e1¼\" BSP male × 28 mm compression\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Working Pressure\u003c\/td\u003e\n\u003ctd\u003e8.6 bar (860 kPa)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePre-charge Pressure\u003c\/td\u003e\n\u003ctd\u003e1.4 bar (factory — adjustable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Boost Head (closed valve)\u003c\/td\u003e\n\u003ctd\u003e4.3 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater Temperature Range\u003c\/td\u003e\n\u003ctd\u003e4 °C to 35 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAmbient Temperature Max\u003c\/td\u003e\n\u003ctd\u003e40 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMembrane Material\u003c\/td\u003e\n\u003ctd\u003eButyl rubber (WRAS 1501305)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTank Construction\u003c\/td\u003e\n\u003ctd\u003eContinuous strand fibreglass + epoxy resin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e5 years (vessel \u0026amp; diaphragm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cdiv class=\"dw-contents-grid\"\u003e\n\u003cdiv class=\"dw-contents-item\"\u003e✔ 1 × Acc200 SuperStream Accumulator Vessel\u003c\/div\u003e\n\u003cdiv class=\"dw-contents-item\"\u003e✔ 1¼\" BSP male to 28 mm compression fittings\u003c\/div\u003e\n\u003cdiv class=\"dw-contents-item\"\u003e✔ Pre-charge adjustment \u0026amp; orientation guide\u003c\/div\u003e\n\u003cdiv class=\"dw-contents-item\"\u003e✔ Full installation \u0026amp; commissioning manual\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"dw-info-box\"\u003e\u003cp\u003e✅ Essential companions: Upstream Kit 22\/28 mm (11007380) for the first unit + Add-on Kit (11007327) for each extra accumulator. For horizontal install use Horizontal Cradle (11007329). For very low incoming pressure add Charger Pump (11007348).\u003c\/p\u003e\u003c\/div\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"dw-faq-item\"\u003e\n\u003cstrong\u003eDoes the Acc200 require electricity or regular servicing?\u003c\/strong\u003eNo — 100% passive, silent (0 dB), zero power consumption and zero maintenance for the 5-year warranty period and beyond.\u003c\/div\u003e\n\u003cdiv class=\"dw-faq-item\"\u003e\n\u003cstrong\u003eHow much extra flow\/pressure does it provide?\u003c\/strong\u003eSupplements incoming mains by up to ~80 litres per minute (pipework dependent) — excellent for 2–3 simultaneous high-flow outlets without noticeable drop-off.\u003c\/div\u003e\n\u003cdiv class=\"dw-faq-item\"\u003e\n\u003cstrong\u003eIs it safe for drinking water systems?\u003c\/strong\u003eYes — WRAS-approved butyl membrane (ref 1501305) stores wholesome potable water with no treatment chemicals or risk of contamination.\u003c\/div\u003e\n\u003cdiv class=\"dw-faq-item\"\u003e\n\u003cstrong\u003eCan I install it horizontally?\u003c\/strong\u003eYes — unlike the Acc130, the Acc200 supports horizontal mounting when used with the dedicated Horizontal Cradle (11007329) — perfect for lofts or low-ceiling plant rooms.\u003c\/div\u003e\n\u003cdiv class=\"dw-faq-item\"\u003e\n\u003cstrong\u003eHow many units can I connect together?\u003c\/strong\u003eAs many as needed — parallel installation is straightforward. Use one Upstream Kit for the first accumulator and one Add-on Kit per additional unit.\u003c\/div\u003e\n\u003cdiv class=\"dw-faq-item\"\u003e\n\u003cstrong\u003eWill it help my combi boiler or unvented cylinder?\u003c\/strong\u003eAbsolutely — many customers fit the Acc200 to eliminate pressure\/fl ow complaints on weak mains, improving hot water delivery and recovery times.\u003c\/div\u003e\n\u003cdiv class=\"dw-faq-item\"\u003e\n\u003cstrong\u003eWhat if my mains pressure is below 1.5–2 bar?\u003c\/strong\u003eFor dynamic pressures consistently below ~2 bar, combine with the SuperStream Charger Pump (11007348) to raise incoming pressure — then let the accumulator handle peak demand boosting.\u003c\/div\u003e\n\u003cdiv class=\"dw-faq-item\"\u003e\n\u003cstrong\u003eHow long does the air pre-charge last?\u003c\/strong\u003eThe nitrogen pre-charge is sealed for the life of the vessel. Simple pressure checks\/adjustments are possible but rarely needed in normal use.\u003c\/div\u003e\n\u003cdiv class=\"dw-faq-item\"\u003e\n\u003cstrong\u003eIs the composite tank more durable than steel?\u003c\/strong\u003eYes — fibreglass\/epoxy construction is highly corrosion-resistant, lighter to handle, and less prone to internal rust or failure over time compared to traditional steel vessels.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":63733965979997,"sku":"Acc200","price":900.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OSOSuperStreamColdWaterAccumulatorTank.jpg?v=1772780702"},{"product_id":"oso-acc250-superstream-250l-cold-water-accumulator-tank","title":"OSO Acc250 SuperStream 250L Cold Water Accumulator Tank","description":"\u003cstyle\u003e\n  .dw-wrap{font-family:inherit;color:inherit;line-height:1.7;font-size:16px}\n  .dw-wrap p,.dw-wrap li,.dw-wrap td,.dw-wrap th{font-size:16px!important;line-height:1.7}\n  .dw-wrap h2{font-size:22px!important;font-weight:700;color:#1a3a5c;border-bottom:3px solid #008377;padding-bottom:6px;margin:2rem 0 1rem;line-height:1.3}\n  .dw-wrap h3{font-size:17px!important;font-weight:700;color:#1a3a5c;margin:1.2rem 0 0.4rem;line-height:1.4}\n  .dw-wrap p{margin:0 0 1rem}\n  .dw-wrap ul{padding-left:1.5rem;margin:0 0 1rem}\n  .dw-wrap ul li{margin-bottom:0.5rem}\n  .dw-badge{display:inline-block;font-size:13px!important;font-weight:700;border-radius:4px;padding:2px 10px;margin-right:5px;margin-bottom:4px;vertical-align:middle}\n  .dw-badge.blue{background:#008377;color:#fff}\n  .dw-badge.navy{background:#1a3a5c;color:#fff}\n  .dw-badge.teal{background:#0d9488;color:#fff}\n  .dw-badge.green{background:#1a7a3c;color:#fff}\n  .dw-badge.grey{background:#555;color:#fff}\n  .dw-intro-box{background:#e0f2fe;border-left:4px solid #008377CF;padding:1.1rem 1.4rem;border-radius:0 6px 6px 0;margin-bottom:1.5rem}\n  .dw-intro-box p{margin:0!important}\n  .dw-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:0.85rem;margin-bottom:1.2rem}\n  .dw-card{background:#e0f2fe;border:1px solid #90caf9;border-radius:6px;padding:1rem 1.1rem;line-height:1.6}\n  .dw-card strong{display:block;color:#1a3a5c;margin-bottom:0.35rem;font-size:16px!important}\n  .dw-info-box{background:#f0fdf4;border:1px solid #86efac;border-radius:6px;padding:1rem 1.2rem;margin:1.2rem 0}\n  .dw-info-box p{margin:0 0 0.5rem!important;color:#065f46;font-weight:700}\n  .dw-comp-box{background:#fff3cd;border:1px solid #ffc107;border-radius:5px;padding:0.9rem 1.1rem;margin:0.8rem 0}\n  .dw-spec-table{width:100%;border-collapse:collapse;margin-bottom:1.5rem}\n  .dw-spec-table th{background:#1a3a5c;color:#fff!important;text-align:left;padding:0.7rem 1rem;font-weight:700;font-size:16px!important}\n  .dw-spec-table td{padding:0.6rem 1rem;border-bottom:1px solid #bde0f5;vertical-align:top;font-size:16px!important}\n  .dw-spec-table tr:nth-child(even) td{background:#e0f2fe}\n  .dw-spec-table td:first-child{font-weight:600;color:#111;width:44%}\n  .dw-faq-item{border-bottom:1px solid #bde0f5;padding:0.9rem 0}\n  .dw-faq-item:last-child{border-bottom:none}\n  .dw-faq-item strong{color:#1a3a5c;font-size:16px!important;display:block;margin-bottom:0.3rem}\n  .dw-contents-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:0.6rem;margin-bottom:1.2rem}\n  .dw-contents-item{background:#f0f9ff;border:1px solid #bde0f5;border-radius:5px;padding:0.6rem 0.9rem;font-size:15px!important}\n\u003c\/style\u003e\n\n\u003cdiv class=\"dw-wrap\"\u003e\n\n  \u003cdiv style=\"margin-bottom:1rem\"\u003e\n    \u003cspan class=\"dw-badge blue\"\u003e11007352\u003c\/span\u003e\n    \u003cspan class=\"dw-badge navy\"\u003eAcc250\u003c\/span\u003e\n    \u003cspan class=\"dw-badge teal\"\u003eSuperStream\u003c\/span\u003e\n    \u003cspan class=\"dw-badge green\"\u003e250 L\u003c\/span\u003e\n    \u003cspan class=\"dw-badge grey\"\u003eCold Water Accumulator\u003c\/span\u003e\n    \u003cspan class=\"dw-badge grey\"\u003ePower-Free Booster\u003c\/span\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-intro-box\"\u003e\n    \u003cp\u003e\u003cstrong\u003eOSO Acc250 SuperStream 250 L Accumulator\u003c\/strong\u003e — High-capacity power-free cold water booster with patented CAD2 diaphragm | Up to ~80 l\/min extra flow | Silent, zero-energy, zero-maintenance | ~125 L usable volume | Horizontal or vertical install (cradle required for horizontal) | WRAS-approved butyl membrane | 5-year warranty | Ideal for 3+ bathroom homes or light commercial\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-comp-box\"\u003e\n    \u003cstrong style=\"color:#856404\"\u003e✅ Largest practical home size in the range – perfect for demanding households or small commercial\u003c\/strong\u003e\n    \u003cp style=\"margin:0.3rem 0 0;color:#5a3a00\"\u003eDelivers extended high-flow periods for multiple showers, baths, kitchen \u0026amp; utility use simultaneously. No electricity, no noise, no servicing. Expandable with add-on kits for even greater capacity.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cp\u003eThe OSO SuperStream Acc250 is the largest vertical\/horizontal accumulator designed for residential and light commercial applications where very high simultaneous demand is expected — think large family homes, guest houses, or small offices with multiple bathrooms and appliances. With 250 litres total volume and approximately 125 litres of usable stored water (at 1.5 bar differential), it provides significantly longer periods of boosted flow before falling back to incoming mains performance.\u003c\/p\u003e\n\n  \u003cp\u003ePowered entirely by incoming mains pressure and the patented CAD2 diaphragm system, it silently supplements flow by up to ~80 litres per minute with zero electricity, zero noise and zero maintenance requirements. The composite fiberglass\/epoxy construction is lightweight (27 kg empty), corrosion-proof and far more durable than traditional steel vessels. A standout feature is the ability to mount horizontally using the dedicated Horizontal Cradle (11007329), making it ideal for space-constrained lofts, plant rooms or under-stair cupboards.\u003c\/p\u003e\n\n  \u003ch2\u003eWhat Makes the SuperStream Acc250 Special?\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHighest Home Capacity\u003c\/strong\u003e — ~125 L usable reserve — longest high-flow duration in the domestic SuperStream range.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCompletely Passive \u0026amp; Green\u003c\/strong\u003e — No power, no CO₂, no bills — sustainable boosting that works during power cuts.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePatented CAD2 Technology\u003c\/strong\u003e — Prevents waterlogging, ensures consistent pressure delivery, maximises effective volume.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHorizontal or Vertical Flexibility\u003c\/strong\u003e — Horizontal option (with cradle) saves valuable vertical space in tight installations.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eUltra-Durable Composite\u003c\/strong\u003e — Fibreglass\/epoxy shell resists corrosion indefinitely — lighter and stronger than steel.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eScalable to Commercial Levels\u003c\/strong\u003e — Parallel multiple units easily for hotels, care homes or multi-let properties.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWRAS Hygienic Approval\u003c\/strong\u003e — Butyl membrane (WRAS 1501305) safe for drinking water systems.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eKey Features\u003c\/h2\u003e\n  \u003cdiv class=\"dw-grid\"\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eExtended Flow Boost\u003c\/strong\u003eUp to ~80 l\/min extra — supports 3+ simultaneous high-demand outlets.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eZero Energy \u0026amp; Silent\u003c\/strong\u003ePassive system — 0 W, 0 dB, reliable in blackouts.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eHigh Usable Volume\u003c\/strong\u003e~125 L effective storage — longer powerful performance.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eHorizontal Mounting\u003c\/strong\u003eSupported with Cradle (11007329) for low-height spaces.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eWRAS-Approved Membrane\u003c\/strong\u003eButyl rubber (ref 1501305) — safe \u0026amp; hygienic.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eComposite Shell\u003c\/strong\u003eLightweight (27 kg empty), corrosion-proof, 5-year warranty.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eAdjustable Pre-Charge\u003c\/strong\u003e1.4 bar factory — optimise on site.\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n  \u003ctable class=\"dw-spec-table\"\u003e\n    \u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e11007352\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTotal Vessel Volume\u003c\/td\u003e\n\u003ctd\u003e250 litres\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eUsable Water Volume\u003c\/td\u003e\n\u003ctd\u003e~125 litres (at 1.5 bar differential)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDimensions (Ø × Height – vertical)\u003c\/td\u003e\n\u003ctd\u003e542 × 1303 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eEmpty Weight\u003c\/td\u003e\n\u003ctd\u003e27 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eFull Weight (approx.)\u003c\/td\u003e\n\u003ctd\u003e152 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eConnections\u003c\/td\u003e\n\u003ctd\u003e1¼\" BSP male × 28 mm compression\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMax Working Pressure\u003c\/td\u003e\n\u003ctd\u003e8.6 bar (860 kPa)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePre-charge Pressure\u003c\/td\u003e\n\u003ctd\u003e1.4 bar (factory — adjustable)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMax Boost Head (closed valve)\u003c\/td\u003e\n\u003ctd\u003e4.3 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eWater Temperature Range\u003c\/td\u003e\n\u003ctd\u003e4 °C to 35 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAmbient Temperature Max\u003c\/td\u003e\n\u003ctd\u003e40 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMembrane Material\u003c\/td\u003e\n\u003ctd\u003eButyl rubber (WRAS 1501305)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTank Construction\u003c\/td\u003e\n\u003ctd\u003eContinuous strand fibreglass + epoxy resin\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e5 years (vessel \u0026amp; diaphragm)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\n  \u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n  \u003cdiv class=\"dw-contents-grid\"\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ 1 × Acc250 SuperStream Accumulator Vessel\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ 1¼\" BSP male to 28 mm compression fittings\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Orientation \u0026amp; pre-charge guide\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Full installation manual\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-info-box\"\u003e\n    \u003cp\u003e✅ Required accessories: Upstream Kit 22\/28 mm (11007380) for first unit + Add-on Kit (11007327) per extra accumulator. Horizontal install needs Horizontal Cradle (11007329). Low pressure? Add Charger Pump (11007348).\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eDoes it use electricity or need servicing?\u003c\/strong\u003e\n    No — fully passive, silent, zero power and zero maintenance for 5+ years.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eHow much boost can I expect?\u003c\/strong\u003e\n    Up to ~80 l\/min extra flow — excellent for 3+ simultaneous outlets (showers, baths, kitchen) without pressure drop.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eIs horizontal mounting possible?\u003c\/strong\u003e\n    Yes — use the Horizontal Cradle (11007329) to install horizontally in lofts or tight spaces.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eIs it drinking water safe?\u003c\/strong\u003e\n    Yes — WRAS-approved butyl membrane (1501305) stores clean potable water.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eCan I link multiple Acc250 units?\u003c\/strong\u003e\n    Yes — parallel connection is simple. One Upstream Kit + Add-on Kits for each additional unit.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eWill it improve my unvented cylinder or combi?\u003c\/strong\u003e\n    Yes — dramatically improves hot \u0026amp; cold delivery on weak mains supplies.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eWhat if pressure is very low?\u003c\/strong\u003e\n    Below ~2 bar dynamic — pair with Charger Pump (11007348) to pre-boost incoming supply.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eHow durable is the composite tank?\u003c\/strong\u003e\n    Extremely — fibreglass\/epoxy resists corrosion far better than steel; lightweight yet very strong.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":63733980299613,"sku":"Acc250","price":1030.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OSOSuperStreamColdWaterAccumulatorTank.jpg?v=1772780702"},{"product_id":"oso-acc350-superstream-350l-cold-water-accumulator-tank","title":"OSO Acc350 SuperStream 350L Cold Water Accumulator Tank","description":"\u003cstyle\u003e\n  .dw-wrap{font-family:inherit;color:inherit;line-height:1.7;font-size:16px}\n  .dw-wrap p,.dw-wrap li,.dw-wrap td,.dw-wrap th{font-size:16px!important;line-height:1.7}\n  .dw-wrap h2{font-size:22px!important;font-weight:700;color:#1a3a5c;border-bottom:3px solid #008377;padding-bottom:6px;margin:2rem 0 1rem;line-height:1.3}\n  .dw-wrap h3{font-size:17px!important;font-weight:700;color:#1a3a5c;margin:1.2rem 0 0.4rem;line-height:1.4}\n  .dw-wrap p{margin:0 0 1rem}\n  .dw-wrap ul{padding-left:1.5rem;margin:0 0 1rem}\n  .dw-wrap ul li{margin-bottom:0.5rem}\n  .dw-badge{display:inline-block;font-size:13px!important;font-weight:700;border-radius:4px;padding:2px 10px;margin-right:5px;margin-bottom:4px;vertical-align:middle}\n  .dw-badge.blue{background:#008377;color:#fff}\n  .dw-badge.navy{background:#1a3a5c;color:#fff}\n  .dw-badge.teal{background:#0d9488;color:#fff}\n  .dw-badge.green{background:#1a7a3c;color:#fff}\n  .dw-badge.grey{background:#555;color:#fff}\n  .dw-intro-box{background:#e0f2fe;border-left:4px solid #008377CF;padding:1.1rem 1.4rem;border-radius:0 6px 6px 0;margin-bottom:1.5rem}\n  .dw-intro-box p{margin:0!important}\n  .dw-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:0.85rem;margin-bottom:1.2rem}\n  .dw-card{background:#e0f2fe;border:1px solid #90caf9;border-radius:6px;padding:1rem 1.1rem;line-height:1.6}\n  .dw-card strong{display:block;color:#1a3a5c;margin-bottom:0.35rem;font-size:16px!important}\n  .dw-info-box{background:#f0fdf4;border:1px solid #86efac;border-radius:6px;padding:1rem 1.2rem;margin:1.2rem 0}\n  .dw-info-box p{margin:0 0 0.5rem!important;color:#065f46;font-weight:700}\n  .dw-comp-box{background:#fff3cd;border:1px solid #ffc107;border-radius:5px;padding:0.9rem 1.1rem;margin:0.8rem 0}\n  .dw-spec-table{width:100%;border-collapse:collapse;margin-bottom:1.5rem}\n  .dw-spec-table th{background:#1a3a5c;color:#fff!important;text-align:left;padding:0.7rem 1rem;font-weight:700;font-size:16px!important}\n  .dw-spec-table td{padding:0.6rem 1rem;border-bottom:1px solid #bde0f5;vertical-align:top;font-size:16px!important}\n  .dw-spec-table tr:nth-child(even) td{background:#e0f2fe}\n  .dw-spec-table td:first-child{font-weight:600;color:#111;width:44%}\n  .dw-faq-item{border-bottom:1px solid #bde0f5;padding:0.9rem 0}\n  .dw-faq-item:last-child{border-bottom:none}\n  .dw-faq-item strong{color:#1a3a5c;font-size:16px!important;display:block;margin-bottom:0.3rem}\n  .dw-contents-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:0.6rem;margin-bottom:1.2rem}\n  .dw-contents-item{background:#f0f9ff;border:1px solid #bde0f5;border-radius:5px;padding:0.6rem 0.9rem;font-size:15px!important}\n\u003c\/style\u003e\n\n\u003cdiv class=\"dw-wrap\"\u003e\n\u003cdiv style=\"margin-bottom:1rem\"\u003e\n\u003cspan class=\"dw-badge blue\"\u003e11007353\u003c\/span\u003e\u003cspan class=\"dw-badge navy\"\u003eAcc350\u003c\/span\u003e\u003cspan class=\"dw-badge teal\"\u003eSuperStream\u003c\/span\u003e\u003cspan class=\"dw-badge green\"\u003e350 L\u003c\/span\u003e\u003cspan class=\"dw-badge grey\"\u003eCold Water Accumulator\u003c\/span\u003e\u003cspan class=\"dw-badge grey\"\u003ePower-Free Booster\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"dw-intro-box\"\u003e\u003cp\u003e\u003cstrong\u003eOSO Acc350 SuperStream 350 L Accumulator\u003c\/strong\u003e — Extra-large power-free cold water accumulator tank booster with patented CAD2 diaphragm technology | Up to ~80 l\/min extra flow | Silent, zero-energy, zero-maintenance | ~175 L usable volume | Vertical install only | WRAS-approved butyl membrane | 5-year warranty | Ideal for large homes, guest houses or light commercial\u003c\/p\u003e\u003c\/div\u003e\n\u003cdiv class=\"dw-comp-box\"\u003e\n\u003cstrong\u003e✅ Serious capacity for high-demand properties – the biggest vertical-only model in the range\u003c\/strong\u003eProvides the longest sustained high-flow period of any domestic SuperStream unit. Perfect when multiple bathrooms, kitchen, utility and appliances run together. No electricity, no noise, no servicing. Easily expandable with add-on kits.\u003c\/div\u003e\n\u003cp\u003eThe OSO SuperStream Acc350 is the heavy-duty vertical accumulator built for properties with exceptional simultaneous demand — larger family homes, bed \u0026amp; breakfasts, small care facilities or light commercial setups where 3–5+ outlets may run at once. With 350 litres total volume and around 175 litres of usable stored water (at 1.5 bar differential), it offers the longest buffer of boosted performance before relying purely on incoming mains supply.\u003c\/p\u003e\n\u003cp\u003ePowered solely by mains pressure via the patented CAD2 diaphragm system, it delivers silent, maintenance-free flow supplementation of up to ~80 litres per minute with zero electricity consumption, zero noise and zero ongoing costs. The robust composite fiberglass\/epoxy shell is corrosion-resistant, weighs only 35 kg empty (much lighter than equivalent steel vessels), and is designed for long-term reliability in demanding environments.\u003c\/p\u003e\n\u003cp\u003eThis model is vertical-mount only (no horizontal cradle option), making it best suited to taller spaces such as plant rooms, garages or dedicated cupboards. Like all SuperStream units, it requires no annual servicing and continues to function perfectly during power outages — a true \"fit and forget\" solution.\u003c\/p\u003e\n\u003ch2\u003eWhat Makes the SuperStream Acc350 Special?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Domestic\/Commercial Reserve\u003c\/strong\u003e — ~175 L usable volume — sustains high flow far longer than smaller models.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e100% Passive \u0026amp; Zero Cost\u003c\/strong\u003e — No electricity, no pumps, no filters, no service bills — environmentally and financially sustainable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePatented CAD2 Diaphragm\u003c\/strong\u003e — Ensures even pressure delivery, prevents waterlogging, and maximises effective storage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrosion-Proof Composite\u003c\/strong\u003e — Fibreglass\/epoxy construction outperforms steel in longevity and weight (35 kg empty).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eScalable for Bigger Sites\u003c\/strong\u003e — Parallel multiple units for hotels, care homes or multi-occupancy buildings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWRAS Hygienic \u0026amp; Compliant\u003c\/strong\u003e — Butyl membrane (WRAS 1501305) safe for potable systems; meets UK water regulations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo Noise Ever\u003c\/strong\u003e — Completely silent (0 dB) — ideal for residential or noise-sensitive commercial settings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cdiv class=\"dw-grid\"\u003e\n\u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eHigh-Capacity Boost\u003c\/strong\u003eUp to ~80 l\/min extra flow — supports 4+ simultaneous high-demand outlets.\u003c\/div\u003e\n\u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eZero Energy \u0026amp; Silent\u003c\/strong\u003ePassive — 0 W, 0 dB, performs in power failures.\u003c\/div\u003e\n\u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eVery Large Usable Volume\u003c\/strong\u003e~175 L effective — extended powerful performance.\u003c\/div\u003e\n\u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eWRAS-Approved Membrane\u003c\/strong\u003eButyl rubber (ref 1501305) — hygienic \u0026amp; potable-safe.\u003c\/div\u003e\n\u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eComposite Construction\u003c\/strong\u003eLightweight (35 kg empty), corrosion-free, 5-year warranty.\u003c\/div\u003e\n\u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003ePre-Charge Adjustable\u003c\/strong\u003e1.4 bar factory — site-optimised for best results.\u003c\/div\u003e\n\u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eExpandable System\u003c\/strong\u003eLink multiple units with add-on kits for commercial-scale flow.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"dw-spec-table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e11007353\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTotal Vessel Volume\u003c\/td\u003e\n\u003ctd\u003e350 litres\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUsable Water Volume\u003c\/td\u003e\n\u003ctd\u003e~175 litres (at 1.5 bar differential)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (Ø × Height – vertical only)\u003c\/td\u003e\n\u003ctd\u003e614 × 1448 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEmpty Weight\u003c\/td\u003e\n\u003ctd\u003e35 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFull Weight (approx.)\u003c\/td\u003e\n\u003ctd\u003e210 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnections\u003c\/td\u003e\n\u003ctd\u003e1¼\" BSP male × 28 mm compression\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Working Pressure\u003c\/td\u003e\n\u003ctd\u003e8.6 bar (860 kPa)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePre-charge Pressure\u003c\/td\u003e\n\u003ctd\u003e1.4 bar (factory — adjustable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Boost Head (closed valve)\u003c\/td\u003e\n\u003ctd\u003e4.3 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater Temperature Range\u003c\/td\u003e\n\u003ctd\u003e4 °C to 35 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAmbient Temperature Max\u003c\/td\u003e\n\u003ctd\u003e40 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMembrane Material\u003c\/td\u003e\n\u003ctd\u003eButyl rubber (WRAS 1501305)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTank Construction\u003c\/td\u003e\n\u003ctd\u003eContinuous strand fibreglass + epoxy resin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e5 years (vessel \u0026amp; diaphragm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cdiv class=\"dw-contents-grid\"\u003e\n\u003cdiv class=\"dw-contents-item\"\u003e✔ 1 × Acc350 SuperStream Accumulator Vessel\u003c\/div\u003e\n\u003cdiv class=\"dw-contents-item\"\u003e✔ 1¼\" BSP male to 28 mm compression fittings\u003c\/div\u003e\n\u003cdiv class=\"dw-contents-item\"\u003e✔ Pre-charge adjustment guide\u003c\/div\u003e\n\u003cdiv class=\"dw-contents-item\"\u003e✔ Full installation \u0026amp; commissioning manual\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"dw-info-box\"\u003e\u003cp\u003e✅ Must-have accessories: Upstream Kit 22\/28 mm (11007380) for first unit + Add-on Kit (11007327) per extra accumulator. For very low incoming pressure add Charger Pump (11007348). Vertical mount only — no horizontal cradle available for this model.\u003c\/p\u003e\u003c\/div\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"dw-faq-item\"\u003e\n\u003cstrong\u003eDoes the Acc350 need power or annual servicing?\u003c\/strong\u003eNo — 100% passive, silent (0 dB), zero electricity and zero maintenance for the full 5-year warranty and beyond.\u003c\/div\u003e\n\u003cdiv class=\"dw-faq-item\"\u003e\n\u003cstrong\u003eHow much extra flow does it deliver?\u003c\/strong\u003eSupplements mains by up to ~80 litres per minute — ideal for 4+ simultaneous high-flow outlets without noticeable pressure loss.\u003c\/div\u003e\n\u003cdiv class=\"dw-faq-item\"\u003e\n\u003cstrong\u003eIs horizontal installation possible?\u003c\/strong\u003eNo — vertical mount only. For horizontal capability choose Acc200 or Acc250 with cradle.\u003c\/div\u003e\n\u003cdiv class=\"dw-faq-item\"\u003e\n\u003cstrong\u003eIs it safe for potable\/drinking water?\u003c\/strong\u003eYes — WRAS-approved butyl membrane (ref 1501305) ensures hygienic storage of wholesome water.\u003c\/div\u003e\n\u003cdiv class=\"dw-faq-item\"\u003e\n\u003cstrong\u003eCan I connect multiple Acc350 units?\u003c\/strong\u003eYes — parallel installation is straightforward. Use one Upstream Kit for the first + Add-on Kits for each additional accumulator.\u003c\/div\u003e\n\u003cdiv class=\"dw-faq-item\"\u003e\n\u003cstrong\u003eWill it benefit my unvented system or combi boiler?\u003c\/strong\u003eYes — dramatically improves hot \u0026amp; cold performance on restricted or low-pressure mains supplies.\u003c\/div\u003e\n\u003cdiv class=\"dw-faq-item\"\u003e\n\u003cstrong\u003eWhat if incoming pressure is consistently very low?\u003c\/strong\u003eFor dynamic pressure below ~2 bar, combine with the SuperStream Charger Pump (11007348) to raise supply pressure before the accumulator.\u003c\/div\u003e\n\u003cdiv class=\"dw-faq-item\"\u003e\n\u003cstrong\u003eHow durable is the composite construction?\u003c\/strong\u003eExtremely — fibreglass\/epoxy resists corrosion indefinitely and is much lighter\/stronger than traditional steel vessels.\u003c\/div\u003e\n\u003cdiv class=\"dw-faq-item\"\u003e\n\u003cstrong\u003eDoes the pre-charge need regular adjustment?\u003c\/strong\u003eFactory-set at 1.4 bar and sealed for life; simple checks possible but rarely necessary in normal operation.\u003c\/div\u003e\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":63734017524061,"sku":"Acc350","price":1350.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OSOSuperStreamColdWaterAccumulatorTank.jpg?v=1772780702"},{"product_id":"oso-acc450-superstream-450l-cold-water-accumulator-tank","title":"OSO Acc450 SuperStream 450L Cold Water Accumulator Tank","description":"\u003cstyle\u003e\n  .dw-wrap{font-family:inherit;color:inherit;line-height:1.7;font-size:16px}\n  .dw-wrap p,.dw-wrap li,.dw-wrap td,.dw-wrap th{font-size:16px!important;line-height:1.7}\n  .dw-wrap h2{font-size:22px!important;font-weight:700;color:#1a3a5c;border-bottom:3px solid #008377;padding-bottom:6px;margin:2rem 0 1rem;line-height:1.3}\n  .dw-wrap h3{font-size:17px!important;font-weight:700;color:#1a3a5c;margin:1.2rem 0 0.4rem;line-height:1.4}\n  .dw-wrap p{margin:0 0 1rem}\n  .dw-wrap ul{padding-left:1.5rem;margin:0 0 1rem}\n  .dw-wrap ul li{margin-bottom:0.5rem}\n  .dw-badge{display:inline-block;font-size:13px!important;font-weight:700;border-radius:4px;padding:2px 10px;margin-right:5px;margin-bottom:4px;vertical-align:middle}\n  .dw-badge.blue{background:#008377;color:#fff}\n  .dw-badge.navy{background:#1a3a5c;color:#fff}\n  .dw-badge.teal{background:#0d9488;color:#fff}\n  .dw-badge.green{background:#1a7a3c;color:#fff}\n  .dw-badge.grey{background:#555;color:#fff}\n  .dw-intro-box{background:#e0f2fe;border-left:4px solid #008377CF;padding:1.1rem 1.4rem;border-radius:0 6px 6px 0;margin-bottom:1.5rem}\n  .dw-intro-box p{margin:0!important}\n  .dw-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:0.85rem;margin-bottom:1.2rem}\n  .dw-card{background:#e0f2fe;border:1px solid #90caf9;border-radius:6px;padding:1rem 1.1rem;line-height:1.6}\n  .dw-card strong{display:block;color:#1a3a5c;margin-bottom:0.35rem;font-size:16px!important}\n  .dw-info-box{background:#f0fdf4;border:1px solid #86efac;border-radius:6px;padding:1rem 1.2rem;margin:1.2rem 0}\n  .dw-info-box p{margin:0 0 0.5rem!important;color:#065f46;font-weight:700}\n  .dw-comp-box{background:#fff3cd;border:1px solid #ffc107;border-radius:5px;padding:0.9rem 1.1rem;margin:0.8rem 0}\n  .dw-spec-table{width:100%;border-collapse:collapse;margin-bottom:1.5rem}\n  .dw-spec-table th{background:#1a3a5c;color:#fff!important;text-align:left;padding:0.7rem 1rem;font-weight:700;font-size:16px!important}\n  .dw-spec-table td{padding:0.6rem 1rem;border-bottom:1px solid #bde0f5;vertical-align:top;font-size:16px!important}\n  .dw-spec-table tr:nth-child(even) td{background:#e0f2fe}\n  .dw-spec-table td:first-child{font-weight:600;color:#111;width:44%}\n  .dw-faq-item{border-bottom:1px solid #bde0f5;padding:0.9rem 0}\n  .dw-faq-item:last-child{border-bottom:none}\n  .dw-faq-item strong{color:#1a3a5c;font-size:16px!important;display:block;margin-bottom:0.3rem}\n  .dw-contents-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:0.6rem;margin-bottom:1.2rem}\n  .dw-contents-item{background:#f0f9ff;border:1px solid #bde0f5;border-radius:5px;padding:0.6rem 0.9rem;font-size:15px!important}\n\u003c\/style\u003e\n\n\u003cdiv class=\"dw-wrap\"\u003e\n\n  \u003cdiv style=\"margin-bottom:1rem\"\u003e\n    \u003cspan class=\"dw-badge blue\"\u003e11007355\u003c\/span\u003e\n    \u003cspan class=\"dw-badge navy\"\u003eAcc450\u003c\/span\u003e\n    \u003cspan class=\"dw-badge teal\"\u003eSuperStream\u003c\/span\u003e\n    \u003cspan class=\"dw-badge green\"\u003e450 L\u003c\/span\u003e\n    \u003cspan class=\"dw-badge grey\"\u003eCold Water Accumulator\u003c\/span\u003e\n    \u003cspan class=\"dw-badge grey\"\u003ePower-Free Booster\u003c\/span\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-intro-box\"\u003e\n    \u003cp\u003e\u003cstrong\u003eOSO Acc450 SuperStream 450 L Accumulator\u003c\/strong\u003e — Largest power-free cold water booster in the SuperStream range with patented CAD2 diaphragm | Up to ~80 l\/min extra flow | Silent, zero-energy, zero-maintenance | ~225 L usable volume | Vertical install only | WRAS-approved butyl membrane | 5-year warranty | Designed for very large homes, guest houses, small hotels or commercial applications\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-comp-box\"\u003e\n    \u003cstrong style=\"color:#856404\"\u003e✅ The ultimate high-capacity solution – maximum reserve for the most demanding installations\u003c\/strong\u003e\n    \u003cp style=\"margin:0.3rem 0 0;color:#5a3a00\"\u003eProvides the longest possible sustained high-flow period before relying on incoming mains. Ideal when 5+ outlets or heavy simultaneous use is common. No electricity, no noise, no servicing. Scalable with multiple units for even larger systems.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cp\u003eThe OSO SuperStream Acc450 is the flagship model in the SuperStream accumulator family — engineered specifically for properties or light commercial sites with extreme simultaneous demand (large family homes, multiple occupancy buildings, small hotels, care facilities, or offices with many bathrooms and appliances). With an impressive 450 litres total volume and approximately 225 litres of usable stored water (at 1.5 bar differential), it delivers the longest buffer of boosted performance, ensuring powerful, consistent pressure across the entire system even during peak usage.\u003c\/p\u003e\n\n  \u003cp\u003eLike the entire SuperStream range, it operates entirely on incoming mains pressure via the patented CAD2 (Controlled Action Diaphragm 2) system — silently supplementing flow by up to ~80 litres per minute with absolutely no electricity, no moving parts, no noise and no maintenance requirements throughout its 5-year warranty period and beyond. The heavy-duty composite fiberglass\/epoxy shell is exceptionally corrosion-resistant, weighs only 46 kg empty (still far lighter than equivalent steel vessels), and is built for long-term reliability in high-demand environments.\u003c\/p\u003e\n\n  \u003cp\u003eThis model is vertical-mount only (no horizontal cradle available), making it suited to taller dedicated spaces such as plant rooms, garages, basements or utility cupboards. It requires no annual servicing and continues to boost performance flawlessly during power cuts — a true “install once and forget” solution for maximum reliability.\u003c\/p\u003e\n\n  \u003ch2\u003eWhat Makes the SuperStream Acc450 Special?\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMaximum Reserve Capacity\u003c\/strong\u003e — ~225 L usable volume — the longest high-flow sustainment of any SuperStream model.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCompletely Passive \u0026amp; Cost-Free\u003c\/strong\u003e — Zero electricity, zero running costs, zero CO₂ — the greenest way to achieve powerful flow.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePatented CAD2 Diaphragm\u003c\/strong\u003e — Prevents waterlogging, delivers stable pressure, maximises effective storage.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eUltra-Resilient Composite\u003c\/strong\u003e — Fibreglass\/epoxy shell resists corrosion indefinitely — lighter and more durable than steel.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCommercial-Grade Scalability\u003c\/strong\u003e — Easily parallel multiple units for hotels, care homes, multi-let properties or larger sites.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWRAS Hygienic Approval\u003c\/strong\u003e — Butyl membrane (WRAS 1501305) fully safe for potable\/drinking water systems.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAbsolute Silence\u003c\/strong\u003e — 0 dB operation — perfect for residential or noise-sensitive commercial environments.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eKey Features\u003c\/h2\u003e\n  \u003cdiv class=\"dw-grid\"\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eExtra-Large Boost\u003c\/strong\u003eUp to ~80 l\/min extra flow — supports 5+ simultaneous high-demand outlets.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eZero Energy \u0026amp; Zero Noise\u003c\/strong\u003ePassive system — 0 W, 0 dB, reliable during outages.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eHighest Usable Volume\u003c\/strong\u003e~225 L effective storage — maximum sustained performance.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eWRAS-Approved Membrane\u003c\/strong\u003eButyl rubber (ref 1501305) — hygienic \u0026amp; potable-safe.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eComposite Construction\u003c\/strong\u003eLightweight (46 kg empty), corrosion-proof, 5-year warranty.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eAdjustable Pre-Charge\u003c\/strong\u003e1.4 bar factory — optimise on-site for peak efficiency.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eHighly Scalable\u003c\/strong\u003eParallel multiple units with add-on kits for commercial-scale demand.\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n  \u003ctable class=\"dw-spec-table\"\u003e\n    \u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e11007355\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTotal Vessel Volume\u003c\/td\u003e\n\u003ctd\u003e450 litres\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eUsable Water Volume\u003c\/td\u003e\n\u003ctd\u003e~225 litres (at 1.5 bar differential)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDimensions (Ø × Height – vertical only)\u003c\/td\u003e\n\u003ctd\u003e614 × 1831 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eEmpty Weight\u003c\/td\u003e\n\u003ctd\u003e46 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eFull Weight (approx.)\u003c\/td\u003e\n\u003ctd\u003e271 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eConnections\u003c\/td\u003e\n\u003ctd\u003e1¼\" BSP male × 28 mm compression\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMax Working Pressure\u003c\/td\u003e\n\u003ctd\u003e8.6 bar (860 kPa)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePre-charge Pressure\u003c\/td\u003e\n\u003ctd\u003e1.4 bar (factory — adjustable)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMax Boost Head (closed valve)\u003c\/td\u003e\n\u003ctd\u003e4.3 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eWater Temperature Range\u003c\/td\u003e\n\u003ctd\u003e4 °C to 35 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAmbient Temperature Max\u003c\/td\u003e\n\u003ctd\u003e40 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMembrane Material\u003c\/td\u003e\n\u003ctd\u003eButyl rubber (WRAS 1501305)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTank Construction\u003c\/td\u003e\n\u003ctd\u003eContinuous strand fibreglass + epoxy resin\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e5 years (vessel \u0026amp; diaphragm)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\n  \u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n  \u003cdiv class=\"dw-contents-grid\"\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ 1 × Acc450 SuperStream Accumulator Vessel\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ 1¼\" BSP male to 28 mm compression fittings\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Pre-charge adjustment \u0026amp; vertical mounting guide\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Full installation \u0026amp; commissioning manual\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-info-box\"\u003e\n    \u003cp\u003e✅ Required accessories: Upstream Kit 22\/28 mm (11007380) for first unit + Add-on Kit (11007327) per extra accumulator. For very low incoming pressure add Charger Pump (11007348). Vertical mount only — no horizontal cradle available for this model.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eDoes the Acc450 require electricity or servicing?\u003c\/strong\u003e\n    No — completely passive, silent (0 dB), zero power draw and zero maintenance for 5+ years.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eHow much additional flow does it provide?\u003c\/strong\u003e\n    Supplements incoming mains by up to ~80 litres per minute — excellent for 5+ simultaneous high-flow outlets without pressure drop.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eCan it be installed horizontally?\u003c\/strong\u003e\n    No — vertical installation only. For horizontal mounting choose Acc200 or Acc250 with cradle.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eIs it suitable for drinking water systems?\u003c\/strong\u003e\n    Yes — WRAS-approved butyl membrane (ref 1501305) ensures safe, hygienic storage of potable water.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eCan multiple Acc450 units be connected?\u003c\/strong\u003e\n    Yes — parallel setup is simple and highly effective. One Upstream Kit for the first unit + Add-on Kits for each additional accumulator.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eWill it improve performance of unvented cylinders or combi boilers?\u003c\/strong\u003e\n    Yes — significantly enhances hot \u0026amp; cold delivery on weak or restricted mains supplies, improving recovery and pressure.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eWhat if incoming mains pressure is extremely low?\u003c\/strong\u003e\n    For dynamic pressure consistently below ~2 bar, pair with the SuperStream Charger Pump (11007348) to pre-boost supply before the accumulator.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eHow durable is the composite tank?\u003c\/strong\u003e\n    Extremely — fibreglass\/epoxy construction is highly corrosion-resistant and much lighter\/stronger than traditional steel vessels.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eDoes the air pre-charge need frequent adjustment?\u003c\/strong\u003e\n    Factory-set at 1.4 bar and sealed for the vessel life; occasional checks are simple but rarely required.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eIs this suitable for commercial use?\u003c\/strong\u003e\n    Yes — ideal for small hotels, care homes, multi-occupancy buildings or light commercial where high simultaneous demand occurs regularly.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":63734035087709,"sku":"Acc450","price":1630.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OSOSuperStreamColdWaterAccumulatorTank.jpg?v=1772780702"},{"product_id":"oso-upstream-kit-22-28-mm-fitting-kit-for-superstream-accumulators-prv-strainer-valves","title":"OSO Upstream Kit 22\/28 mm Fitting Kit For SuperStream Accumulators PRV Strainer Valves","description":"\u003cstyle\u003e\n  .dw-wrap{font-family:inherit;color:inherit;line-height:1.7;font-size:16px}\n  .dw-wrap p,.dw-wrap li,.dw-wrap td,.dw-wrap th{font-size:16px!important;line-height:1.7}\n  .dw-wrap h2{font-size:22px!important;font-weight:700;color:#1a3a5c;border-bottom:3px solid #008377;padding-bottom:6px;margin:2rem 0 1rem;line-height:1.3}\n  .dw-wrap h3{font-size:17px!important;font-weight:700;color:#1a3a5c;margin:1.2rem 0 0.4rem;line-height:1.4}\n  .dw-wrap p{margin:0 0 1rem}\n  .dw-wrap ul{padding-left:1.5rem;margin:0 0 1rem}\n  .dw-wrap ul li{margin-bottom:0.5rem}\n  .dw-badge{display:inline-block;font-size:13px!important;font-weight:700;border-radius:4px;padding:2px 10px;margin-right:5px;margin-bottom:4px;vertical-align:middle}\n  .dw-badge.blue{background:#008377;color:#fff}\n  .dw-badge.navy{background:#1a3a5c;color:#fff}\n  .dw-badge.teal{background:#0d9488;color:#fff}\n  .dw-badge.green{background:#1a7a3c;color:#fff}\n  .dw-badge.grey{background:#555;color:#fff}\n  .dw-intro-box{background:#e0f2fe;border-left:4px solid #008377CF;padding:1.1rem 1.4rem;border-radius:0 6px 6px 0;margin-bottom:1.5rem}\n  .dw-intro-box p{margin:0!important}\n  .dw-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:0.85rem;margin-bottom:1.2rem}\n  .dw-card{background:#e0f2fe;border:1px solid #90caf9;border-radius:6px;padding:1rem 1.1rem;line-height:1.6}\n  .dw-card strong{display:block;color:#1a3a5c;margin-bottom:0.35rem;font-size:16px!important}\n  .dw-info-box{background:#f0fdf4;border:1px solid #86efac;border-radius:6px;padding:1rem 1.2rem;margin:1.2rem 0}\n  .dw-info-box p{margin:0 0 0.5rem!important;color:#065f46;font-weight:700}\n  .dw-comp-box{background:#fff3cd;border:1px solid #ffc107;border-radius:5px;padding:0.9rem 1.1rem;margin:0.8rem 0}\n  .dw-spec-table{width:100%;border-collapse:collapse;margin-bottom:1.5rem}\n  .dw-spec-table th{background:#1a3a5c;color:#fff!important;text-align:left;padding:0.7rem 1rem;font-weight:700;font-size:16px!important}\n  .dw-spec-table td{padding:0.6rem 1rem;border-bottom:1px solid #bde0f5;vertical-align:top;font-size:16px!important}\n  .dw-spec-table tr:nth-child(even) td{background:#e0f2fe}\n  .dw-spec-table td:first-child{font-weight:600;color:#111;width:44%}\n  .dw-faq-item{border-bottom:1px solid #bde0f5;padding:0.9rem 0}\n  .dw-faq-item:last-child{border-bottom:none}\n  .dw-faq-item strong{color:#1a3a5c;font-size:16px!important;display:block;margin-bottom:0.3rem}\n  .dw-contents-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:0.6rem;margin-bottom:1.2rem}\n  .dw-contents-item{background:#f0f9ff;border:1px solid #bde0f5;border-radius:5px;padding:0.6rem 0.9rem;font-size:15px!important}\n\u003c\/style\u003e\n\n\u003cdiv class=\"dw-wrap\"\u003e\n\n  \u003cdiv style=\"margin-bottom:1rem\"\u003e\n    \u003cspan class=\"dw-badge blue\"\u003e11007380\u003c\/span\u003e\n    \u003cspan class=\"dw-badge navy\"\u003eUpstream Kit\u003c\/span\u003e\n    \u003cspan class=\"dw-badge teal\"\u003e22\/28 mm\u003c\/span\u003e\n    \u003cspan class=\"dw-badge green\"\u003eFitting Kit\u003c\/span\u003e\n    \u003cspan class=\"dw-badge grey\"\u003eFor SuperStream\u003c\/span\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-intro-box\"\u003e\n    \u003cp\u003e\u003cstrong\u003eOSO Upstream Kit 22\/28 mm\u003c\/strong\u003e — Complete fitting kit for safe and compliant installation of SuperStream accumulators | Includes pressure reducing valve (PRV), strainer, double check valve, isolation valve, pressure gauges \u0026amp; vessel connector | Available in 22 mm or 28 mm sizes | WRAS-compliant brass components | Essential for every SuperStream system (one kit per system, add-on kits for extra accumulators)\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-comp-box\"\u003e\n    \u003cstrong style=\"color:#856404\"\u003e✅ Mandatory for correct \u0026amp; regulation-compliant SuperStream installation\u003c\/strong\u003e\n    \u003cp style=\"margin:0.3rem 0 0;color:#5a3a00\"\u003eProtects the accumulator and downstream system with pressure control, backflow prevention and debris filtration. Choose size to match your incoming mains pipe (22 mm or 28 mm). One kit serves the entire system — use Add-on Kits (11007327) for additional accumulators.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cp\u003eThe OSO Upstream Kit 22\/28 mm is the official, purpose-designed connection and protection package required for every SuperStream accumulator installation. It ensures the system operates safely, efficiently and in full compliance with UK Water Regulations (Water Supply Regulations 1999 \u0026amp; subsequent amendments). The kit includes all critical upstream components: a 6 bar adjustable pressure reducing valve (PRV) with integral gauge, inline strainer to catch debris, double check valve to prevent backflow, full-bore isolation valve for servicing, additional pressure gauge, and brass vessel connector fittings.\u003c\/p\u003e\n\n  \u003cp\u003eMade from high-quality, WRAS-approved brass components, the kit is built to last and simplifies installation by providing everything needed in one box (no hunting for individual parts). It protects the accumulator from excessive pressure, reduces the risk of contamination or reverse flow, and allows easy monitoring\/adjustment of incoming pressure — critical for optimising accumulator performance and longevity.\u003c\/p\u003e\n\n  \u003cp\u003eChoose the correct size (22 mm or 28 mm) to match your property's incoming mains pipe diameter. This is a single-kit-per-system item — for systems with multiple accumulators, you only need one upstream kit plus the appropriate number of Add-on Kits (11007327 or 11007328 for Acc130-specific).\u003c\/p\u003e\n\n  \u003ch2\u003eWhat Makes the OSO Upstream Kit Special?\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eComplete \u0026amp; Regulation-Compliant\u003c\/strong\u003e — Contains every required upstream component for Water Regs approval in one convenient kit.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003e6 Bar PRV with Gauge\u003c\/strong\u003e — Limits inlet pressure to safe levels (adjustable down to 5 bar max) — protects accumulator \u0026amp; downstream plumbing.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDouble Check Valve\u003c\/strong\u003e — Prevents backflow\/contamination — mandatory for non-return protection.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eInline Strainer\u003c\/strong\u003e — Y-pattern filter catches debris before it reaches the accumulator — extends system life.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFull-Bore Isolation Valve\u003c\/strong\u003e — Easy servicing\/shutdown without draining the system.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWRAS-Approved Brass\u003c\/strong\u003e — All components compliant for potable water use — reliable \u0026amp; long-lasting.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eTwo Sizes Available\u003c\/strong\u003e — 22 mm or 28 mm to suit common UK mains pipe sizes — no adapters needed.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eKey Features\u003c\/h2\u003e\n  \u003cdiv class=\"dw-grid\"\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003ePressure Reducing Valve (PRV)\u003c\/strong\u003e6 bar preset (adjustable), with integral 0–10 bar gauge — safe \u0026amp; controllable inlet pressure.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eInline Strainer\u003c\/strong\u003eY-pattern filter protects accumulator from debris\/particles.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eDouble Check Valve\u003c\/strong\u003eNon-return protection — prevents backflow into mains supply.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eIsolation Ball Valve\u003c\/strong\u003eFull-bore lever handle — quick isolation for maintenance.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003ePressure Gauge\u003c\/strong\u003eAdditional 0–10 bar gauge for upstream monitoring.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eVessel Connector\u003c\/strong\u003eBrass fitting for secure accumulator connection.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eWRAS Compliant\u003c\/strong\u003eAll parts approved for potable water systems.\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n  \u003ctable class=\"dw-spec-table\"\u003e\n    \u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e11007380\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePipe Sizes Available\u003c\/td\u003e\n\u003ctd\u003e22 mm or 28 mm (choose at purchase)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePRV Setting\u003c\/td\u003e\n\u003ctd\u003e6 bar (adjustable to max 5 bar)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMax Working Pressure\u003c\/td\u003e\n\u003ctd\u003e10 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMaterials\u003c\/td\u003e\n\u003ctd\u003eHigh-quality brass (WRAS-approved)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eIncluded Components\u003c\/td\u003e\n\u003ctd\u003ePRV + gauge, strainer, double check valve, isolation valve, extra gauge, vessel connector, brass bush\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCompliance\u003c\/td\u003e\n\u003ctd\u003eWRAS, Water Supply Regulations (UK)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\n  \u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n  \u003cdiv class=\"dw-contents-grid\"\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Inline Strainer (Y-pattern)\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Pressure Reducing Valve 6 bar + integral gauge\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Double Check Valve (non-return)\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Full-bore Isolation Ball Valve\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Additional 0–10 bar Pressure Gauge\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Brass Vessel Connector \u0026amp; Bush (¼ × ½\" BSP)\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Installation \u0026amp; commissioning guide\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-info-box\"\u003e\n    \u003cp\u003e✅ One kit required per SuperStream system (regardless of number of accumulators). For additional accumulators use Add-on Kit (11007327) or Acc130-specific Add-on (11007328). Installation must be by a qualified plumber in accordance with Water Regulations.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eIs this kit mandatory for SuperStream installation?\u003c\/strong\u003e\n    Yes — it provides essential pressure control, backflow prevention, filtration and isolation required for compliance and safe operation.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eWhich size should I choose – 22 mm or 28 mm?\u003c\/strong\u003e\n    Match the kit to your incoming mains pipe diameter (most common UK sizes). If unsure, check your stopcock or incoming pipe.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eDo I need one kit per accumulator?\u003c\/strong\u003e\n    No — only one Upstream Kit per system. For extra accumulators use Add-on Kits (11007327 or 11007328 for Acc130).\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eCan I adjust the PRV pressure?\u003c\/strong\u003e\n    Yes — factory set at 6 bar but adjustable down to a maximum of 5 bar to suit site conditions or accumulator pre-charge.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eAre all components WRAS-approved?\u003c\/strong\u003e\n    Yes — every part is compliant for use in potable water systems under UK regulations.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eDoes the kit work with the Charger Pump?\u003c\/strong\u003e\n    Yes — fully compatible. Install the Charger Pump before the Upstream Kit if incoming pressure is very low.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eWho should install this kit?\u003c\/strong\u003e\n    A qualified plumber in accordance with Water Supply Regulations (WRAS\/BS 6700). Incorrect installation may void warranty or breach regulations.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eWhat if my mains pipe is a different size?\u003c\/strong\u003e\n    The kit is specifically for 22 mm or 28 mm. For other sizes, consult a plumber for appropriate reducers\/adapters (not included).\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"22mm","offer_id":63734075982173,"sku":"Upstream-Kit-22","price":330.0,"currency_code":"GBP","in_stock":true},{"title":"28mm","offer_id":63734076014941,"sku":"Upstream-Kit-28mm","price":330.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OSOUpstreamKit22-28mmFittingKitForSuperStreamAccumulatorsPRVStrainerValves.png?v=1772782293"},{"product_id":"oso-add-on-kit-fitting-kit-for-extra-superstream-accumulator-expansion-parallel-connection","title":"OSO Add On Kit Fitting Kit For Extra SuperStream Accumulator Expansion Parallel Connection","description":"\u003cstyle\u003e\n  .dw-wrap{font-family:inherit;color:inherit;line-height:1.7;font-size:16px}\n  .dw-wrap p,.dw-wrap li,.dw-wrap td,.dw-wrap th{font-size:16px!important;line-height:1.7}\n  .dw-wrap h2{font-size:22px!important;font-weight:700;color:#1a3a5c;border-bottom:3px solid #008377;padding-bottom:6px;margin:2rem 0 1rem;line-height:1.3}\n  .dw-wrap h3{font-size:17px!important;font-weight:700;color:#1a3a5c;margin:1.2rem 0 0.4rem;line-height:1.4}\n  .dw-wrap p{margin:0 0 1rem}\n  .dw-wrap ul{padding-left:1.5rem;margin:0 0 1rem}\n  .dw-wrap ul li{margin-bottom:0.5rem}\n  .dw-badge{display:inline-block;font-size:13px!important;font-weight:700;border-radius:4px;padding:2px 10px;margin-right:5px;margin-bottom:4px;vertical-align:middle}\n  .dw-badge.blue{background:#008377;color:#fff}\n  .dw-badge.navy{background:#1a3a5c;color:#fff}\n  .dw-badge.teal{background:#0d9488;color:#fff}\n  .dw-badge.green{background:#1a7a3c;color:#fff}\n  .dw-badge.grey{background:#555;color:#fff}\n  .dw-intro-box{background:#e0f2fe;border-left:4px solid #008377CF;padding:1.1rem 1.4rem;border-radius:0 6px 6px 0;margin-bottom:1.5rem}\n  .dw-intro-box p{margin:0!important}\n  .dw-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:0.85rem;margin-bottom:1.2rem}\n  .dw-card{background:#e0f2fe;border:1px solid #90caf9;border-radius:6px;padding:1rem 1.1rem;line-height:1.6}\n  .dw-card strong{display:block;color:#1a3a5c;margin-bottom:0.35rem;font-size:16px!important}\n  .dw-info-box{background:#f0fdf4;border:1px solid #86efac;border-radius:6px;padding:1rem 1.2rem;margin:1.2rem 0}\n  .dw-info-box p{margin:0 0 0.5rem!important;color:#065f46;font-weight:700}\n  .dw-comp-box{background:#fff3cd;border:1px solid #ffc107;border-radius:5px;padding:0.9rem 1.1rem;margin:0.8rem 0}\n  .dw-spec-table{width:100%;border-collapse:collapse;margin-bottom:1.5rem}\n  .dw-spec-table th{background:#1a3a5c;color:#fff!important;text-align:left;padding:0.7rem 1rem;font-weight:700;font-size:16px!important}\n  .dw-spec-table td{padding:0.6rem 1rem;border-bottom:1px solid #bde0f5;vertical-align:top;font-size:16px!important}\n  .dw-spec-table tr:nth-child(even) td{background:#e0f2fe}\n  .dw-spec-table td:first-child{font-weight:600;color:#111;width:44%}\n  .dw-faq-item{border-bottom:1px solid #bde0f5;padding:0.9rem 0}\n  .dw-faq-item:last-child{border-bottom:none}\n  .dw-faq-item strong{color:#1a3a5c;font-size:16px!important;display:block;margin-bottom:0.3rem}\n  .dw-contents-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:0.6rem;margin-bottom:1.2rem}\n  .dw-contents-item{background:#f0f9ff;border:1px solid #bde0f5;border-radius:5px;padding:0.6rem 0.9rem;font-size:15px!important}\n\u003c\/style\u003e\n\n\u003cdiv class=\"dw-wrap\"\u003e\n\n  \u003cdiv style=\"margin-bottom:1rem\"\u003e\n    \u003cspan class=\"dw-badge blue\"\u003e11007327\u003c\/span\u003e\n    \u003cspan class=\"dw-badge navy\"\u003eAdd On Kit\u003c\/span\u003e\n    \u003cspan class=\"dw-badge teal\"\u003eExpansion Fitting\u003c\/span\u003e\n    \u003cspan class=\"dw-badge green\"\u003eFor Extra Accumulator\u003c\/span\u003e\n    \u003cspan class=\"dw-badge grey\"\u003eSuperStream Compatible\u003c\/span\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-intro-box\"\u003e\n    \u003cp\u003e\u003cstrong\u003eOSO Add On Kit (11007327)\u003c\/strong\u003e — Essential expansion fitting kit for adding extra SuperStream accumulators in parallel | Includes vessel connector, isolation valve \u0026amp; brass fittings | Enables higher total flow \u0026amp; capacity | WRAS-compliant brass components | Use one kit per additional accumulator (beyond the first unit which uses Upstream Kit) | Compatible with all SuperStream models (Acc130, Acc200, Acc250, Acc350, Acc450)\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-comp-box\"\u003e\n    \u003cstrong style=\"color:#856404\"\u003e✅ Required for every extra accumulator – simple way to scale your system\u003c\/strong\u003e\n    \u003cp style=\"margin:0.3rem 0 0;color:#5a3a00\"\u003eOne Upstream Kit serves the whole system; add this Add On Kit for each additional accumulator to connect in parallel and boost overall flow\/volume. No need to replace or upgrade the original upstream components.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cp\u003eThe OSO Add On Kit (11007327) is the dedicated expansion accessory that allows you to increase the total storage capacity and flow-boosting capability of your SuperStream system. Once the first accumulator is installed with the mandatory Upstream Kit 22\/28 mm (11007380), each additional accumulator requires one of these Add On Kits to connect safely and efficiently in parallel — creating a modular, high-performance cold water boosting array.\u003c\/p\u003e\n\n  \u003cp\u003eThe kit includes high-quality brass fittings: a pressure vessel connector (for secure attachment to the accumulator inlet), a full-bore isolation ball valve (for individual unit isolation during servicing without shutting down the whole system), and necessary brass bushes\/adapters. All components are WRAS-approved for potable water use, ensuring full compliance with UK Water Regulations.\u003c\/p\u003e\n\n  \u003cp\u003eThis makes scaling straightforward and cost-effective: start with one accumulator and add more as your needs grow (e.g. larger family, additional bathrooms, or commercial upgrade) without redoing the upstream plumbing. Compatible across the entire SuperStream range — perfect for creating systems that deliver exceptional simultaneous flow far beyond what a single accumulator can achieve.\u003c\/p\u003e\n\n  \u003ch2\u003eWhat Makes the OSO Add On Kit Special?\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eModular Expansion Made Simple\u003c\/strong\u003e — One kit per extra accumulator — no complex re-plumbing required when increasing capacity.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFull Isolation Capability\u003c\/strong\u003e — Built-in full-bore ball valve lets you service or drain one accumulator without affecting others.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWRAS-Compliant Brass\u003c\/strong\u003e — All fittings approved for drinking water systems — safe, durable \u0026amp; regulation-compliant.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eUniversal Compatibility\u003c\/strong\u003e — Works with every SuperStream model (130 L to 450 L) — flexible for any system size.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCost-Effective Scaling\u003c\/strong\u003e — Add capacity incrementally without buying a second complete Upstream Kit — saves money on larger installs.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eQuick \u0026amp; Reliable Connection\u003c\/strong\u003e — Brass vessel connector \u0026amp; fittings ensure secure, leak-free parallel linking.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eKey Features\u003c\/h2\u003e\n  \u003cdiv class=\"dw-grid\"\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eVessel Connector\u003c\/strong\u003eBrass fitting for direct, secure connection to extra accumulator inlet.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eFull-Bore Isolation Valve\u003c\/strong\u003eLever-operated ball valve — isolate individual units easily for maintenance.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eBrass Bushes \u0026amp; Adapters\u003c\/strong\u003eIncludes ¼\" × ½\" BSP bush for optional gauge or future expansion.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eWRAS Approved\u003c\/strong\u003eAll components compliant for potable water use in UK systems.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eParallel System Ready\u003c\/strong\u003eEnables high-flow multi-accumulator arrays without upstream rework.\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n  \u003ctable class=\"dw-spec-table\"\u003e\n    \u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e11007327\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eAll SuperStream accumulators (Acc130–Acc450)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eQuantity Required\u003c\/td\u003e\n\u003ctd\u003eOne per additional accumulator (after first unit with Upstream Kit)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMaterials\u003c\/td\u003e\n\u003ctd\u003eHigh-quality brass (WRAS-approved)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eIncluded Components\u003c\/td\u003e\n\u003ctd\u003eVessel connector, isolation ball valve, brass bush\/adapters\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMax Pressure\u003c\/td\u003e\n\u003ctd\u003e10 bar (matches accumulator rating)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCompliance\u003c\/td\u003e\n\u003ctd\u003eWRAS, Water Supply Regulations (UK)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\n  \u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n  \u003cdiv class=\"dw-contents-grid\"\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Brass Pressure Vessel Connector\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Full-bore Isolation Ball Valve\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Brass Bush (¼\" × ½\" BSP)\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Installation \u0026amp; connection guide\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-info-box\"\u003e\n    \u003cp\u003e✅ Use with: One Upstream Kit 22\/28 mm (11007380) for the complete system + one Add On Kit per extra accumulator. For Acc130-specific add-on use dedicated kit (11007328). Installation by qualified plumber per Water Regulations.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eHow many Add On Kits do I need?\u003c\/strong\u003e\n    One for each additional accumulator beyond the first (which uses the Upstream Kit). Example: 3 accumulators = 1 Upstream + 2 Add On Kits.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eIs it compatible with all SuperStream sizes?\u003c\/strong\u003e\n    Yes — works with Acc130, Acc200, Acc250, Acc350 \u0026amp; Acc450 models for parallel connection.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eDo I still need the Upstream Kit?\u003c\/strong\u003e\n    Yes — the Upstream Kit is required for the first accumulator (pressure control, strainer, check valve etc.). Add On Kits are expansion only.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eAre the fittings WRAS-approved?\u003c\/strong\u003e\n    Yes — all brass components are approved for potable water systems under UK regulations.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eCan I install multiple accumulators without this kit?\u003c\/strong\u003e\n    No — proper parallel connection requires these fittings for safe isolation and secure linking.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eIs there a special kit for Acc130?\u003c\/strong\u003e\n    Yes — use the Acc130-specific Add On Kit (11007328) if adding only extra 130 L units; this general kit (11007327) suits all sizes including mixed.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eWho should install the Add On Kit?\u003c\/strong\u003e\n    A qualified plumber in accordance with Water Supply Regulations — ensures compliance and preserves warranty.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":63734077030749,"sku":"Upstream-Add-on-Kit","price":110.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OSOSuperStreamColdWaterAccumulatorSchematics.webp?v=1772783120"},{"product_id":"oso-add-on-130-kit-fitting-kit-for-extra-acc130-superstream-accumulator-expansion","title":"OSO Add On 130 Kit Fitting Kit For Extra Acc130 SuperStream Accumulator Expansion","description":"\u003cstyle\u003e\n  .dw-wrap{font-family:inherit;color:inherit;line-height:1.7;font-size:16px}\n  .dw-wrap p,.dw-wrap li,.dw-wrap td,.dw-wrap th{font-size:16px!important;line-height:1.7}\n  .dw-wrap h2{font-size:22px!important;font-weight:700;color:#1a3a5c;border-bottom:3px solid #008377;padding-bottom:6px;margin:2rem 0 1rem;line-height:1.3}\n  .dw-wrap h3{font-size:17px!important;font-weight:700;color:#1a3a5c;margin:1.2rem 0 0.4rem;line-height:1.4}\n  .dw-wrap p{margin:0 0 1rem}\n  .dw-wrap ul{padding-left:1.5rem;margin:0 0 1rem}\n  .dw-wrap ul li{margin-bottom:0.5rem}\n  .dw-badge{display:inline-block;font-size:13px!important;font-weight:700;border-radius:4px;padding:2px 10px;margin-right:5px;margin-bottom:4px;vertical-align:middle}\n  .dw-badge.blue{background:#008377;color:#fff}\n  .dw-badge.navy{background:#1a3a5c;color:#fff}\n  .dw-badge.teal{background:#0d9488;color:#fff}\n  .dw-badge.green{background:#1a7a3c;color:#fff}\n  .dw-badge.grey{background:#555;color:#fff}\n  .dw-intro-box{background:#e0f2fe;border-left:4px solid #008377CF;padding:1.1rem 1.4rem;border-radius:0 6px 6px 0;margin-bottom:1.5rem}\n  .dw-intro-box p{margin:0!important}\n  .dw-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:0.85rem;margin-bottom:1.2rem}\n  .dw-card{background:#e0f2fe;border:1px solid #90caf9;border-radius:6px;padding:1rem 1.1rem;line-height:1.6}\n  .dw-card strong{display:block;color:#1a3a5c;margin-bottom:0.35rem;font-size:16px!important}\n  .dw-info-box{background:#f0fdf4;border:1px solid #86efac;border-radius:6px;padding:1rem 1.2rem;margin:1.2rem 0}\n  .dw-info-box p{margin:0 0 0.5rem!important;color:#065f46;font-weight:700}\n  .dw-comp-box{background:#fff3cd;border:1px solid #ffc107;border-radius:5px;padding:0.9rem 1.1rem;margin:0.8rem 0}\n  .dw-spec-table{width:100%;border-collapse:collapse;margin-bottom:1.5rem}\n  .dw-spec-table th{background:#1a3a5c;color:#fff!important;text-align:left;padding:0.7rem 1rem;font-weight:700;font-size:16px!important}\n  .dw-spec-table td{padding:0.6rem 1rem;border-bottom:1px solid #bde0f5;vertical-align:top;font-size:16px!important}\n  .dw-spec-table tr:nth-child(even) td{background:#e0f2fe}\n  .dw-spec-table td:first-child{font-weight:600;color:#111;width:44%}\n  .dw-faq-item{border-bottom:1px solid #bde0f5;padding:0.9rem 0}\n  .dw-faq-item:last-child{border-bottom:none}\n  .dw-faq-item strong{color:#1a3a5c;font-size:16px!important;display:block;margin-bottom:0.3rem}\n  .dw-contents-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:0.6rem;margin-bottom:1.2rem}\n  .dw-contents-item{background:#f0f9ff;border:1px solid #bde0f5;border-radius:5px;padding:0.6rem 0.9rem;font-size:15px!important}\n\u003c\/style\u003e\n\n\u003cdiv class=\"dw-wrap\"\u003e\n\n  \u003cdiv style=\"margin-bottom:1rem\"\u003e\n    \u003cspan class=\"dw-badge blue\"\u003e11007328\u003c\/span\u003e\n    \u003cspan class=\"dw-badge navy\"\u003eAdd On 130 Kit\u003c\/span\u003e\n    \u003cspan class=\"dw-badge teal\"\u003eAcc130 Specific\u003c\/span\u003e\n    \u003cspan class=\"dw-badge green\"\u003eExpansion Fitting\u003c\/span\u003e\n    \u003cspan class=\"dw-badge grey\"\u003eFor Extra Acc130 Only\u003c\/span\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-intro-box\"\u003e\n    \u003cp\u003e\u003cstrong\u003eOSO Add On 130 Kit (11007328)\u003c\/strong\u003e — Dedicated expansion fitting kit for adding extra Acc130 SuperStream accumulators only | Includes size-specific vessel connector, isolation valve \u0026amp; brass fittings | Enables parallel connection \u0026amp; increased total flow\/volume | WRAS-compliant brass components | Use one kit per additional Acc130 (beyond the first unit which uses Upstream Kit) | Not compatible with larger Acc models\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-comp-box\"\u003e\n    \u003cstrong style=\"color:#856404\"\u003e✅ Acc130-specific expansion – perfect when building a multi-Acc130 system\u003c\/strong\u003e\n    \u003cp style=\"margin:0.3rem 0 0;color:#5a3a00\"\u003eIf you're scaling with multiple 130 L units (e.g. for very even distribution or space constraints), this kit ensures correct connection. For mixed sizes or larger models use the general Add On Kit (11007327).\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cp\u003eThe OSO Add On 130 Kit (11007328) is the specialised expansion accessory tailored exclusively for the Acc130 SuperStream accumulator. It allows you to add extra 130 L units in parallel to increase overall stored volume and flow-boosting capacity while keeping the system balanced and cost-effective.\u003c\/p\u003e\n\n  \u003cp\u003eAfter installing the first Acc130 with the mandatory Upstream Kit 22\/28 mm (11007380), each additional Acc130 requires one of these kits. It includes precisely sized brass fittings: a pressure vessel connector matched to the Acc130 inlet, a full-bore isolation ball valve (for individual unit servicing without system shutdown), and necessary brass bushes\/adapters. All parts are WRAS-approved for potable water use and fully compliant with UK Water Regulations.\u003c\/p\u003e\n\n  \u003cp\u003eThis kit is **not interchangeable** with the general Add On Kit (11007327) when adding only Acc130 units — the connector and valve sizing are optimised specifically for the 130 L model to ensure a perfect, leak-free fit. It makes expanding an Acc130-based system straightforward, ideal for properties where smaller individual units offer better placement flexibility (e.g. multiple lofts, cupboards or plant areas).\u003c\/p\u003e\n\n  \u003ch2\u003eWhat Makes the OSO Add On 130 Kit Special?\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAcc130-Optimised Design\u003c\/strong\u003e — Connector and fittings sized precisely for the 130 L model — guaranteed perfect fit \u0026amp; performance.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eIndividual Isolation\u003c\/strong\u003e — Full-bore ball valve allows servicing or draining one Acc130 without affecting others in the array.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWRAS-Compliant Brass\u003c\/strong\u003e — All components approved for drinking water — safe, reliable \u0026amp; regulation-compliant.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCost-Effective Acc130 Scaling\u003c\/strong\u003e — Add capacity in smaller 130 L increments without buying a second full Upstream Kit.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eParallel Array Ready\u003c\/strong\u003e — Enables high-flow multi-Acc130 systems (e.g. 2–4 units) for even distribution or space-limited installs.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSimple \u0026amp; Secure Connection\u003c\/strong\u003e — Brass fittings ensure durable, leak-free parallel linking every time.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eKey Features\u003c\/h2\u003e\n  \u003cdiv class=\"dw-grid\"\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eAcc130-Specific Vessel Connector\u003c\/strong\u003eBrass fitting tailored to Acc130 inlet for secure, exact connection.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eFull-Bore Isolation Valve\u003c\/strong\u003eLever ball valve — isolate individual Acc130 units easily.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eBrass Bushes \u0026amp; Adapters\u003c\/strong\u003eIncludes ¼\" × ½\" BSP bush for optional gauge or future use.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eWRAS Approved\u003c\/strong\u003eAll parts compliant for potable water systems in the UK.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eParallel Expansion\u003c\/strong\u003eBuild multi-Acc130 arrays without upstream rework.\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n  \u003ctable class=\"dw-spec-table\"\u003e\n    \u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e11007328\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eExtra Acc130 SuperStream accumulators only\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eQuantity Required\u003c\/td\u003e\n\u003ctd\u003eOne per additional Acc130 (after first with Upstream Kit)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMaterials\u003c\/td\u003e\n\u003ctd\u003eHigh-quality brass (WRAS-approved)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eIncluded Components\u003c\/td\u003e\n\u003ctd\u003eAcc130-specific vessel connector, isolation ball valve, brass bush\/adapters\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMax Pressure\u003c\/td\u003e\n\u003ctd\u003e10 bar (matches accumulator rating)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCompliance\u003c\/td\u003e\n\u003ctd\u003eWRAS, Water Supply Regulations (UK)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\n  \u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n  \u003cdiv class=\"dw-contents-grid\"\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Acc130-Specific Brass Pressure Vessel Connector\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Full-bore Isolation Ball Valve\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Brass Bush (¼\" × ½\" BSP)\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Installation \u0026amp; connection guide\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-info-box\"\u003e\n    \u003cp\u003e✅ Use with: One Upstream Kit 22\/28 mm (11007380) for the complete system + one Add On 130 Kit per extra Acc130. For larger models or mixed sizes use general Add On Kit (11007327). Installation by qualified plumber per Water Regulations.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eWhy is there a separate kit just for Acc130?\u003c\/strong\u003e\n    The connector and valve are sized specifically for the smaller 1\" BSP inlet on the Acc130 — ensures perfect, leak-free fit when expanding with 130 L units only.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eCan I use this kit with larger Acc models?\u003c\/strong\u003e\n    No — this is Acc130-only. For Acc200, Acc250, Acc350 or Acc450 use the general Add On Kit (11007327).\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eHow many kits do I need for multiple Acc130 units?\u003c\/strong\u003e\n    One Upstream Kit for the first Acc130 + one Add On 130 Kit per additional unit (e.g. 4 Acc130 = 1 Upstream + 3 Add On 130 Kits).\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eAre the fittings WRAS-approved?\u003c\/strong\u003e\n    Yes — all brass components are approved for potable water systems under UK regulations.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eDoes it include everything to connect an extra Acc130?\u003c\/strong\u003e\n    Yes — vessel connector, isolation valve and necessary bushes — ready for parallel plumbing.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eWho should install this kit?\u003c\/strong\u003e\n    A qualified plumber in accordance with Water Supply Regulations — ensures compliance and preserves warranty.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eWhat if I mix Acc130 and larger models?\u003c\/strong\u003e\n    Use the general Add On Kit (11007327) for the larger units — this 130-specific kit is only for additional Acc130 connections.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":63734087254365,"sku":"Upstream-Add-On-130-Kit","price":110.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OSOSuperStreamColdWaterAccumulatorSchematics.webp?v=1772783120"},{"product_id":"oso-superstream-charger-pump-pressure-booster-for-low-mains-with-superstream-accumulators","title":"OSO SuperStream Charger Pump Pressure Booster For Low Mains With SuperStream Accumulators","description":"\u003cstyle\u003e\n  .dw-wrap{font-family:inherit;color:inherit;line-height:1.7;font-size:16px}\n  .dw-wrap p,.dw-wrap li,.dw-wrap td,.dw-wrap th{font-size:16px!important;line-height:1.7}\n  .dw-wrap h2{font-size:22px!important;font-weight:700;color:#1a3a5c;border-bottom:3px solid #008377;padding-bottom:6px;margin:2rem 0 1rem;line-height:1.3}\n  .dw-wrap h3{font-size:17px!important;font-weight:700;color:#1a3a5c;margin:1.2rem 0 0.4rem;line-height:1.4}\n  .dw-wrap p{margin:0 0 1rem}\n  .dw-wrap ul{padding-left:1.5rem;margin:0 0 1rem}\n  .dw-wrap ul li{margin-bottom:0.5rem}\n  .dw-badge{display:inline-block;font-size:13px!important;font-weight:700;border-radius:4px;padding:2px 10px;margin-right:5px;margin-bottom:4px;vertical-align:middle}\n  .dw-badge.blue{background:#008377;color:#fff}\n  .dw-badge.navy{background:#1a3a5c;color:#fff}\n  .dw-badge.teal{background:#0d9488;color:#fff}\n  .dw-badge.green{background:#1a7a3c;color:#fff}\n  .dw-badge.grey{background:#555;color:#fff}\n  .dw-intro-box{background:#e0f2fe;border-left:4px solid #008377CF;padding:1.1rem 1.4rem;border-radius:0 6px 6px 0;margin-bottom:1.5rem}\n  .dw-intro-box p{margin:0!important}\n  .dw-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:0.85rem;margin-bottom:1.2rem}\n  .dw-card{background:#e0f2fe;border:1px solid #90caf9;border-radius:6px;padding:1rem 1.1rem;line-height:1.6}\n  .dw-card strong{display:block;color:#1a3a5c;margin-bottom:0.35rem;font-size:16px!important}\n  .dw-info-box{background:#f0fdf4;border:1px solid #86efac;border-radius:6px;padding:1rem 1.2rem;margin:1.2rem 0}\n  .dw-info-box p{margin:0 0 0.5rem!important;color:#065f46;font-weight:700}\n  .dw-comp-box{background:#fff3cd;border:1px solid #ffc107;border-radius:5px;padding:0.9rem 1.1rem;margin:0.8rem 0}\n  .dw-spec-table{width:100%;border-collapse:collapse;margin-bottom:1.5rem}\n  .dw-spec-table th{background:#1a3a5c;color:#fff!important;text-align:left;padding:0.7rem 1rem;font-weight:700;font-size:16px!important}\n  .dw-spec-table td{padding:0.6rem 1rem;border-bottom:1px solid #bde0f5;vertical-align:top;font-size:16px!important}\n  .dw-spec-table tr:nth-child(even) td{background:#e0f2fe}\n  .dw-spec-table td:first-child{font-weight:600;color:#111;width:44%}\n  .dw-faq-item{border-bottom:1px solid #bde0f5;padding:0.9rem 0}\n  .dw-faq-item:last-child{border-bottom:none}\n  .dw-faq-item strong{color:#1a3a5c;font-size:16px!important;display:block;margin-bottom:0.3rem}\n  .dw-contents-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:0.6rem;margin-bottom:1.2rem}\n  .dw-contents-item{background:#f0f9ff;border:1px solid #bde0f5;border-radius:5px;padding:0.6rem 0.9rem;font-size:15px!important}\n\u003c\/style\u003e\n\n\u003cdiv class=\"dw-wrap\"\u003e\n\n  \u003cdiv style=\"margin-bottom:1rem\"\u003e\n    \u003cspan class=\"dw-badge blue\"\u003e11007348\u003c\/span\u003e\n    \u003cspan class=\"dw-badge navy\"\u003eSuperStream Pump\u003c\/span\u003e\n    \u003cspan class=\"dw-badge teal\"\u003eCharger Pump\u003c\/span\u003e\n    \u003cspan class=\"dw-badge green\"\u003ePressure Booster\u003c\/span\u003e\n    \u003cspan class=\"dw-badge grey\"\u003eFor 22\/28 Upstream Kit\u003c\/span\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-intro-box\"\u003e\n    \u003cp\u003e\u003cstrong\u003eOSO SuperStream Charger Pump (11007348)\u003c\/strong\u003e — Quiet, intelligent pressure booster pump designed exclusively for SuperStream accumulator systems | Boosts incoming mains to ~3.5 bar | Activates only on demand (very low noise ~38 dB(A)) | Bronze construction for potable water | Wall-mounted, compact | Essential when dynamic mains pressure is consistently below ~2 bar | Works seamlessly with all SuperStream accumulators \u0026amp; Upstream Kit\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-comp-box\"\u003e\n    \u003cstrong style=\"color:#856404\"\u003e✅ The perfect partner for very low-pressure mains – turns weak supplies into powerful boosted systems\u003c\/strong\u003e\n    \u003cp style=\"margin:0.3rem 0 0;color:#5a3a00\"\u003eOnly needed when incoming dynamic pressure is below ~2 bar (common in rural areas, tall buildings or shared supplies). The accumulator still provides peak-demand boosting even if the pump is off (e.g. power cut). No noisy constant-running pump — intelligent on-demand operation.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cp\u003eThe OSO SuperStream Charger Pump is a specialised, low-noise booster pump created to pre-pressurise incoming mains water before it reaches the SuperStream accumulator(s) and Upstream Kit. It is **only required** in properties where the dynamic (flowing) mains pressure is consistently below approximately 2 bar — situations where even a single accumulator cannot fully compensate for very weak incoming supply (e.g. long rural runs, high-rise apartments, or properties at the end of a shared main).\u003c\/p\u003e\n\n  \u003cp\u003eUnlike traditional full-house booster pumps that run constantly and create significant noise\/vibration, the Charger Pump is intelligent: it activates **only** when flow is detected and pressure drops below a threshold, then shuts off when demand stops. This results in extremely quiet operation (~38 dB(A) maximum — quieter than a normal conversation) and very low energy use. The pump is bronze-bodied for full WRAS approval and potable water safety, wall-mounted for easy installation, and designed to work in harmony with the accumulator's passive boosting — the accumulator handles short, sharp peaks while the pump maintains base pressure during prolonged demand.\u003c\/p\u003e\n\n  \u003cp\u003eKey benefit: the entire SuperStream system remains functional during power failures — the accumulator alone will still boost flow using stored pressure, albeit without the pre-boost from the pump. This makes it far more reliable than conventional pumped systems.\u003c\/p\u003e\n\n  \u003ch2\u003eWhat Makes the SuperStream Charger Pump Special?\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eIntelligent On-Demand Operation\u003c\/strong\u003e — Only runs when needed (flow detected) — silent most of the time, huge energy savings vs constant-run pumps.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eVery Low Noise\u003c\/strong\u003e — Maximum ~38 dB(A) — can be installed near living areas without disturbance (much quieter than standard booster pumps at 50–70 dB).\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBronze Construction\u003c\/strong\u003e — WRAS-approved for direct potable water contact — safe, corrosion-resistant and long-lasting.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFail-Safe Design\u003c\/strong\u003e — Accumulator continues to boost during power cuts or pump downtime — no loss of basic functionality.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCompact Wall-Mount\u003c\/strong\u003e — Small footprint, easy retrofit alongside SuperStream accumulator and Upstream Kit.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePerfect System Match\u003c\/strong\u003e — Engineered specifically for SuperStream — no compatibility issues or over\/under-boosting.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eKey Features\u003c\/h2\u003e\n  \u003cdiv class=\"dw-grid\"\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003ePressure Boost\u003c\/strong\u003eRaises incoming mains to ~3.5 bar — ideal when dynamic pressure \u0026lt;2 bar.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eUltra-Quiet\u003c\/strong\u003eMax ~38 dB(A) — delayed start, runs only on demand.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eBronze Body\u003c\/strong\u003eWRAS-approved for potable water — durable \u0026amp; hygienic.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eEnergy Efficient\u003c\/strong\u003eProportional pumping — only boosts required portion of flow.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eWall-Mounted\u003c\/strong\u003eCompact design — easy install near accumulator\/Upstream Kit.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eFail-Safe\u003c\/strong\u003eAccumulator still boosts if pump is off (power cut or maintenance).\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n  \u003ctable class=\"dw-spec-table\"\u003e\n    \u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e11007348\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eSuperStream accumulators + 22\/28 mm Upstream Kit\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBoost Output\u003c\/td\u003e\n\u003ctd\u003eUp to ~3.5 bar (when incoming \u0026lt;2 bar)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eNoise Level\u003c\/td\u003e\n\u003ctd\u003eMaximum ~38 dB(A)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eBronze body (WRAS-approved)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePower Supply\u003c\/td\u003e\n\u003ctd\u003e230 V AC, single-phase\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003eWall-mounted (brackets included)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eActivation\u003c\/td\u003e\n\u003ctd\u003eOn-demand (flow\/pressure sensor triggered)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCompliance\u003c\/td\u003e\n\u003ctd\u003eWRAS, UK Water Regulations\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\n  \u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n  \u003cdiv class=\"dw-contents-grid\"\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ 1 × SuperStream Charger Pump unit\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Wall mounting brackets \u0026amp; fixings\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Connection fittings \u0026amp; seals\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Electrical \u0026amp; plumbing installation manual\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-info-box\"\u003e\n    \u003cp\u003e✅ Must be installed upstream of the Upstream Kit and accumulator(s). Required only when dynamic mains pressure is consistently below ~2 bar. Installation by qualified plumber\/electrician per regulations. Pair with any SuperStream accumulator model.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eWhen do I actually need the Charger Pump?\u003c\/strong\u003e\n    Only if your measured dynamic (flowing) mains pressure is consistently below ~2 bar. Above this, the accumulator alone usually provides excellent boosting.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eHow noisy is it really?\u003c\/strong\u003e\n    Maximum ~38 dB(A) — comparable to a quiet library or soft whisper. It only runs when water is flowing and stops immediately after — most users report it's barely noticeable.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eDoes the system still work if the pump fails or power is off?\u003c\/strong\u003e\n    Yes — the SuperStream accumulator continues to boost flow using stored pressure — you lose pre-boost but retain core functionality (unlike conventional pumped systems).\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eIs it WRAS-approved for drinking water?\u003c\/strong\u003e\n    Yes — bronze body is fully approved for potable water contact.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eCan it be used with multiple accumulators?\u003c\/strong\u003e\n    Yes — one Charger Pump serves the entire system (before the Upstream Kit). No need for one per accumulator.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003ePower consumption and wiring?\u003c\/strong\u003e\n    Low energy (runs only on demand). Requires standard 230 V fused spur by a qualified electrician — full wiring details in manual.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eWho installs it?\u003c\/strong\u003e\n    Qualified plumber for pipework + electrician for power — must comply with Water Regulations and Part P electrical safety.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":63734098461021,"sku":"SuperStream-Pump","price":1500.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OSOSuperStreamChargerPumpPressureBoosterForLowMainsWithSuperStreamAccumulators.jpg?v=1772783120"},{"product_id":"oso-horizontal-cradle-mounting-bracket-for-acc200-acc250-superstream-accumulators","title":"OSO Horizontal Cradle Mounting Bracket For Acc200 \u0026 Acc250 SuperStream Accumulators","description":"\u003cstyle\u003e\n  .dw-wrap{font-family:inherit;color:inherit;line-height:1.7;font-size:16px}\n  .dw-wrap p,.dw-wrap li,.dw-wrap td,.dw-wrap th{font-size:16px!important;line-height:1.7}\n  .dw-wrap h2{font-size:22px!important;font-weight:700;color:#1a3a5c;border-bottom:3px solid #008377;padding-bottom:6px;margin:2rem 0 1rem;line-height:1.3}\n  .dw-wrap h3{font-size:17px!important;font-weight:700;color:#1a3a5c;margin:1.2rem 0 0.4rem;line-height:1.4}\n  .dw-wrap p{margin:0 0 1rem}\n  .dw-wrap ul{padding-left:1.5rem;margin:0 0 1rem}\n  .dw-wrap ul li{margin-bottom:0.5rem}\n  .dw-badge{display:inline-block;font-size:13px!important;font-weight:700;border-radius:4px;padding:2px 10px;margin-right:5px;margin-bottom:4px;vertical-align:middle}\n  .dw-badge.blue{background:#008377;color:#fff}\n  .dw-badge.navy{background:#1a3a5c;color:#fff}\n  .dw-badge.teal{background:#0d9488;color:#fff}\n  .dw-badge.green{background:#1a7a3c;color:#fff}\n  .dw-badge.grey{background:#555;color:#fff}\n  .dw-intro-box{background:#e0f2fe;border-left:4px solid #008377CF;padding:1.1rem 1.4rem;border-radius:0 6px 6px 0;margin-bottom:1.5rem}\n  .dw-intro-box p{margin:0!important}\n  .dw-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:0.85rem;margin-bottom:1.2rem}\n  .dw-card{background:#e0f2fe;border:1px solid #90caf9;border-radius:6px;padding:1rem 1.1rem;line-height:1.6}\n  .dw-card strong{display:block;color:#1a3a5c;margin-bottom:0.35rem;font-size:16px!important}\n  .dw-info-box{background:#f0fdf4;border:1px solid #86efac;border-radius:6px;padding:1rem 1.2rem;margin:1.2rem 0}\n  .dw-info-box p{margin:0 0 0.5rem!important;color:#065f46;font-weight:700}\n  .dw-comp-box{background:#fff3cd;border:1px solid #ffc107;border-radius:5px;padding:0.9rem 1.1rem;margin:0.8rem 0}\n  .dw-spec-table{width:100%;border-collapse:collapse;margin-bottom:1.5rem}\n  .dw-spec-table th{background:#1a3a5c;color:#fff!important;text-align:left;padding:0.7rem 1rem;font-weight:700;font-size:16px!important}\n  .dw-spec-table td{padding:0.6rem 1rem;border-bottom:1px solid #bde0f5;vertical-align:top;font-size:16px!important}\n  .dw-spec-table tr:nth-child(even) td{background:#e0f2fe}\n  .dw-spec-table td:first-child{font-weight:600;color:#111;width:44%}\n  .dw-faq-item{border-bottom:1px solid #bde0f5;padding:0.9rem 0}\n  .dw-faq-item:last-child{border-bottom:none}\n  .dw-faq-item strong{color:#1a3a5c;font-size:16px!important;display:block;margin-bottom:0.3rem}\n  .dw-contents-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:0.6rem;margin-bottom:1.2rem}\n  .dw-contents-item{background:#f0f9ff;border:1px solid #bde0f5;border-radius:5px;padding:0.6rem 0.9rem;font-size:15px!important}\n\u003c\/style\u003e\n\n\u003cdiv class=\"dw-wrap\"\u003e\n\n  \u003cdiv style=\"margin-bottom:1rem\"\u003e\n    \u003cspan class=\"dw-badge blue\"\u003e11007329\u003c\/span\u003e\n    \u003cspan class=\"dw-badge navy\"\u003eHorizontal Cradle\u003c\/span\u003e\n    \u003cspan class=\"dw-badge teal\"\u003eMounting Bracket\u003c\/span\u003e\n    \u003cspan class=\"dw-badge green\"\u003eFor Acc200 \/ Acc250\u003c\/span\u003e\n    \u003cspan class=\"dw-badge grey\"\u003eSuperStream Accessory\u003c\/span\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-intro-box\"\u003e\n    \u003cp\u003e\u003cstrong\u003eOSO Horizontal Cradle (11007329)\u003c\/strong\u003e — Heavy-duty mounting bracket for horizontal installation of Acc200 \u0026amp; Acc250 SuperStream accumulators | Galvanised steel construction | Supports full tank weight when full (~122 kg for Acc200, ~152 kg for Acc250) | Ideal for lofts, low-ceiling plant rooms or space-restricted areas | Floor or wall fixings (not included) | Enables flexible placement where vertical height is limited\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-comp-box\"\u003e\n    \u003cstrong style=\"color:#856404\"\u003e✅ Essential for horizontal mounting of Acc200 \u0026amp; Acc250 – unlocks installation options in tight spaces\u003c\/strong\u003e\n    \u003cp style=\"margin:0.3rem 0 0;color:#5a3a00\"\u003eOnly compatible with Acc200 and Acc250 models. Provides secure, stable support for horizontal orientation. Fixings (bolts, screws, rawlplugs) chosen according to surface (concrete, timber joists etc.) – not supplied in box.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cp\u003eThe OSO Horizontal Cradle is a purpose-engineered accessory that allows the Acc200 (200 L) and Acc250 (250 L) SuperStream accumulators to be installed horizontally rather than vertically. This is a game-changer for many UK properties where loft spaces, under-stair cupboards, plant rooms or utility areas have restricted vertical clearance but sufficient horizontal room.\u003c\/p\u003e\n\n  \u003cp\u003eManufactured from galvanised steel for long-term corrosion resistance and structural strength, the cradle is designed to safely support the full weight of a water-filled accumulator (~122 kg for Acc200, ~152 kg for Acc250). It features a sturdy cradle frame with locating points to hold the vessel securely in horizontal position, preventing rolling or tipping. The design allows floor mounting (most common) or wall mounting (where floor space is extremely tight), giving installers maximum flexibility.\u003c\/p\u003e\n\n  \u003cp\u003eHorizontal installation does **not** affect performance — the patented CAD2 diaphragm and air pre-charge system function identically in either orientation. This cradle makes it possible to fit larger-capacity SuperStream units in locations previously only suitable for smaller vertical models like the Acc130.\u003c\/p\u003e\n\n  \u003ch2\u003eWhat Makes the OSO Horizontal Cradle Special?\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEnables Horizontal Install\u003c\/strong\u003e — Turns space-limited areas (low lofts, under stairs, shallow cupboards) into viable locations for Acc200\/Acc250.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHigh Load Capacity\u003c\/strong\u003e — Rated to safely hold full tank weight (up to ~152 kg for Acc250) with generous safety margin.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGalvanised Steel\u003c\/strong\u003e — Corrosion-resistant finish — long service life even in damp lofts or plant rooms.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFlexible Fixing Options\u003c\/strong\u003e — Floor or wall mountable — adapt to concrete, timber joists, blockwork etc. (fixings not included).\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSecure Vessel Location\u003c\/strong\u003e — Cradle design prevents movement or rolling — stable and safe installation.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eOfficial OSO Accessory\u003c\/strong\u003e — Engineered \u0026amp; tested specifically for Acc200 \u0026amp; Acc250 — no compatibility concerns.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eKey Features\u003c\/h2\u003e\n  \u003cdiv class=\"dw-grid\"\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eHeavy-Duty Support\u003c\/strong\u003eGalvanised steel frame — holds up to ~152 kg (Acc250 full) securely.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eHorizontal Orientation\u003c\/strong\u003eAllows Acc200\/Acc250 to fit where vertical height is restricted.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eFloor or Wall Mount\u003c\/strong\u003eMultiple fixing points — adapt to different surfaces \u0026amp; spaces.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eCorrosion Resistant\u003c\/strong\u003eGalvanised finish — ideal for lofts, garages, plant rooms.\u003c\/div\u003e\n    \u003cdiv class=\"dw-card\"\u003e\n\u003cstrong\u003eSimple Assembly\u003c\/strong\u003eEasy to position \u0026amp; secure accumulator — no specialist tools needed.\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n  \u003ctable class=\"dw-spec-table\"\u003e\n    \u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e11007329\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eAcc200 \u0026amp; Acc250 SuperStream only (not Acc130, Acc350 or Acc450)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eGalvanised steel\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMax Load Capacity\u003c\/td\u003e\n\u003ctd\u003e~152 kg (Acc250 full weight) with safety margin\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMounting Options\u003c\/td\u003e\n\u003ctd\u003eFloor or wall (fixings not included – select per surface)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eHot-dip galvanised (corrosion protection)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\n  \u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n  \u003cdiv class=\"dw-contents-grid\"\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ 1 × Horizontal Cradle Frame (galvanised steel)\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Mounting brackets \u0026amp; assembly hardware\u003c\/div\u003e\n    \u003cdiv class=\"dw-contents-item\"\u003e✔ Positioning \u0026amp; fixing guide\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-info-box\"\u003e\n    \u003cp\u003e✅ Compatible only with Acc200 (11007351) \u0026amp; Acc250 (11007352). Fixings (bolts, screws, rawlplugs, chemical anchors etc.) chosen \u0026amp; supplied by installer according to surface type (concrete, timber, blockwork). Not suitable for Acc130, Acc350 or Acc450 models.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eWhich models can use this cradle?\u003c\/strong\u003e\n    Only Acc200 and Acc250 SuperStream accumulators — not compatible with Acc130 (vertical only), Acc350 or Acc450.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eCan I wall-mount it instead of floor?\u003c\/strong\u003e\n    Yes — the cradle has fixing points for both floor and wall installation. Choose appropriate heavy-duty fixings for your wall type (e.g. masonry anchors for brick\/block).\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eAre fixings included?\u003c\/strong\u003e\n    No — cradle only. Installer selects \u0026amp; supplies fixings suitable for surface (concrete floor, timber joists, solid wall etc.) to ensure safe load-bearing.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eDoes horizontal mounting affect performance?\u003c\/strong\u003e\n    No — the CAD2 diaphragm \u0026amp; air pre-charge function identically in horizontal or vertical orientation. Full boosting capacity retained.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eHow much weight does it need to support?\u003c\/strong\u003e\n    Acc200 full ≈122 kg, Acc250 full ≈152 kg. Cradle is rated with safety margin above these weights.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eIs it easy to fit the accumulator into the cradle?\u003c\/strong\u003e\n    Yes — designed for straightforward placement. Two people recommended for lifting full or empty vessel into position safely.\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"dw-faq-item\"\u003e\n    \u003cstrong\u003eWho installs it?\u003c\/strong\u003e\n    Qualified plumber or competent installer — ensure secure fixing to load-bearing surface per building regs \u0026amp; manufacturer guidance.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":63734177956189,"sku":"superstream-horizontal-cradle","price":320.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OSOHorizontalCradleSuperstream.jpg?v=1772783322"},{"product_id":"oso-delta-a-rated-180l-pre-plumbed-indirect-unvented-hot-water-cylinder","title":"OSO Delta A-Rated 180L Pre-plumbed Indirect Unvented Hot Water Cylinder","description":"\u003cdiv style=\"font-size:16px;font-family:Arial,sans-serif;color:#1a1a1a;max-width:900px;margin:0 auto;line-height:1.6;\"\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eOSO Delta DC180PP\u003c\/strong\u003e is an \u003cstrong\u003eErP A-rated, pre-plumbed indirect unvented hot water cylinder\u003c\/strong\u003e — the most energy-efficient 180-litre cylinder available in the UK market. The award-winning Delta series achieves its Class A rating through a patented combination of \u003cstrong\u003eVacuum Insulation Panels (VIPs)\u003c\/strong\u003e and 4th-generation foam, reducing standing heat loss by approximately \u003cstrong\u003e1 kWh per day\u003c\/strong\u003e versus a comparable C-rated cylinder. The \u003cstrong\u003epre-plumbed (PP) configuration\u003c\/strong\u003e incorporates an integral expansion vessel and pre-fitted cold-feed assembly, cutting on-site installation time by up to 70%. At \u003cstrong\u003e595 mm diameter × 1165 mm height\u003c\/strong\u003e and weighing 42 kg empty, it fits within a standard UK airing cupboard. Rated for \u003cstrong\u003e10 bar pressure\u003c\/strong\u003e with a \u003cstrong\u003e22-minute recovery time\u003c\/strong\u003e at ErP A.\u003c\/p\u003e\n\n\u003cdiv style=\"display:flex;flex-wrap:wrap;gap:12px;margin:20px 0;\"\u003e\n  \u003cdiv style=\"flex:1;min-width:110px;background:#008377CF;color:#fff;border-radius:8px;padding:14px 10px;text-align:center;\"\u003e\n\u003cdiv style=\"font-size:22px;font-weight:700;\"\u003eErP A\u003c\/div\u003e\n\u003cdiv style=\"font-size:12px;margin-top:4px;\"\u003eEnergy rating\u003c\/div\u003e\n\u003c\/div\u003e\n  \u003cdiv style=\"flex:1;min-width:110px;background:#008377CF;color:#fff;border-radius:8px;padding:14px 10px;text-align:center;\"\u003e\n\u003cdiv style=\"font-size:22px;font-weight:700;\"\u003e180 L\u003c\/div\u003e\n\u003cdiv style=\"font-size:12px;margin-top:4px;\"\u003eCapacity\u003c\/div\u003e\n\u003c\/div\u003e\n  \u003cdiv style=\"flex:1;min-width:110px;background:#008377CF;color:#fff;border-radius:8px;padding:14px 10px;text-align:center;\"\u003e\n\u003cdiv style=\"font-size:22px;font-weight:700;\"\u003e22 min\u003c\/div\u003e\n\u003cdiv style=\"font-size:12px;margin-top:4px;\"\u003eRecovery time\u003c\/div\u003e\n\u003c\/div\u003e\n  \u003cdiv style=\"flex:1;min-width:110px;background:#008377CF;color:#fff;border-radius:8px;padding:14px 10px;text-align:center;\"\u003e\n\u003cdiv style=\"font-size:22px;font-weight:700;\"\u003e1165 mm\u003c\/div\u003e\n\u003cdiv style=\"font-size:12px;margin-top:4px;\"\u003eHeight\u003c\/div\u003e\n\u003c\/div\u003e\n  \u003cdiv style=\"flex:1;min-width:110px;background:#008377CF;color:#fff;border-radius:8px;padding:14px 10px;text-align:center;\"\u003e\n\u003cdiv style=\"font-size:22px;font-weight:700;\"\u003eVIP\u003c\/div\u003e\n\u003cdiv style=\"font-size:12px;margin-top:4px;\"\u003eVacuum Insulation Panels\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"background:#fff3f3;border-left:4px solid #cc0000;padding:14px 16px;border-radius:6px;margin:16px 0;\"\u003e\n  \u003cstrong style=\"color:#cc0000;\"\u003eInstaller requirement:\u003c\/strong\u003e Must be installed by a \u003cstrong\u003eG3-qualified engineer\u003c\/strong\u003e under Building Regulations Part G. Benchmark Commissioning Checklist must be completed and provided to the customer.\n\u003c\/div\u003e\n\n\u003cdiv style=\"background:#e6f4f3;border-left:4px solid #008377CF;padding:14px 16px;border-radius:6px;margin:16px 0;\"\u003e\n  \u003cstrong style=\"color:#005c54;\"\u003eShorter than competitors:\u003c\/strong\u003e OSO cylinders produce up to \u003cstrong\u003e20% more hot water per metre of height\u003c\/strong\u003e than comparable models. A 180 L OSO Delta at 1165 mm height fits where many 150 L alternatives won't.\n\u003c\/div\u003e\n\n\u003cdiv style=\"background:#008377CF;color:#fff;padding:12px 18px;border-radius:6px;margin:28px 0 16px;font-size:17px;font-weight:700;\"\u003eKey Features\u003c\/div\u003e\n\u003cdiv style=\"display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;margin-bottom:24px;\"\u003e\n\n  \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:16px;\"\u003e\n    \u003cdiv style=\"font-weight:700;color:#008377;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003eVacuum Insulation Panels — ErP A Rated\u003c\/div\u003e\n    \u003cp style=\"margin:0;font-size:15px;\"\u003eThe OSO Delta is unique in achieving \u003cstrong\u003eErP Class A across its full capacity range\u003c\/strong\u003e. This is made possible by combining \u003cstrong\u003eVacuum Insulation Panels (VIPs)\u003c\/strong\u003e — a technology borrowed from cryogenic engineering — with 4th-generation polyurethane foam. The result is dramatically lower standing heat loss than any C-rated competitor: saving approximately \u003cstrong\u003e1 kWh per day\u003c\/strong\u003e in the popular 210 L size versus a C-rated cylinder. Over a year, that is meaningful energy and cost saving for every household.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:16px;\"\u003e\n    \u003cdiv style=\"font-weight:700;color:#008377;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003eAward-Winning OSO Design\u003c\/div\u003e\n    \u003cp style=\"margin:0;font-size:15px;\"\u003eThe Delta series is \u003cstrong\u003eindustry award-winning\u003c\/strong\u003e and recognised as the most energy-efficient unvented hot water cylinder range available. OSO cylinders are \u003cstrong\u003eshorter than most competitors at equivalent volume\u003c\/strong\u003e — producing up to 20% more hot water per unit of height. This means you can often \u003cstrong\u003edownsize the floor plan footprint\u003c\/strong\u003e when switching to OSO without losing capacity.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:16px;\"\u003e\n    \u003cdiv style=\"font-weight:700;color:#008377;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003ePre-Plumbed — Up to 70% Labour Saving\u003c\/div\u003e\n    \u003cp style=\"margin:0;font-size:15px;\"\u003eThe DC pre-plumbed (PP) configuration includes an \u003cstrong\u003eintegral expansion vessel\u003c\/strong\u003e and pre-fitted cold-feed assembly — saving up to \u003cstrong\u003e70% of installation labour\u003c\/strong\u003e compared to an unplumbed cylinder requiring separate component fitting. This makes the DC PP particularly popular with \u003cstrong\u003ehousebuilders, developers and new-build programmes\u003c\/strong\u003e where installation speed and repeatability matter.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:16px;\"\u003e\n    \u003cdiv style=\"font-weight:700;color:#008377;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003eDigital Thermostat with Anti-Legionella and Holiday Modes\u003c\/div\u003e\n    \u003cp style=\"margin:0;font-size:15px;\"\u003eThe OSO Delta is supplied with a \u003cstrong\u003edigital adjustable thermostat\u003c\/strong\u003e (20–70 °C, preset 60 °C) with built-in \u003cstrong\u003eanti-legionella pasteurisation\u003c\/strong\u003e and \u003cstrong\u003eholiday mode\u003c\/strong\u003e. The anti-legionella cycle automatically heats the cylinder to above 60 °C at set intervals to suppress Legionella bacteria — a requirement under HSG274 guidance for commercial and multi-occupancy buildings.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:16px;\"\u003e\n    \u003cdiv style=\"font-weight:700;color:#008377;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003eHoneywell Motorised Valve Included\u003c\/div\u003e\n    \u003cp style=\"margin:0;font-size:15px;\"\u003eThe pre-plumbed kit includes a \u003cstrong\u003eHoneywell V4043H 2-port motorised valve\u003c\/strong\u003e — a market-standard, widely-stocked component that installers and service engineers are familiar with. If a valve ever needs replacement, sourcing is straightforward from any plumbing merchant. The full G3 kit is included: strainer, PRV, expansion relief valve, drain cock, tundish, T\u0026amp;P relief valve (10 bar \/ 90–95 °C).\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:16px;\"\u003e\n    \u003cdiv style=\"font-weight:700;color:#008377;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003eAdjustable Factory-Fitted Feet\u003c\/div\u003e\n    \u003cp style=\"margin:0;font-size:15px;\"\u003eThe cylinder sits on \u003cstrong\u003efactory-fitted adjustable feet\u003c\/strong\u003e, making it straightforward to level on uneven plant room floors without shimming. The feet also raise the cylinder slightly off the floor, helping to protect against damp and making inspection of the base easier during annual servicing.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003cdiv style=\"background:#008377CF;color:#fff;padding:12px 18px;border-radius:6px;margin:28px 0 16px;font-size:17px;font-weight:700;\"\u003eTechnical Specifications — DC180PP\u003c\/div\u003e\n\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:15px;margin-bottom:24px;\"\u003e\n  \u003cthead\u003e\u003ctr style=\"background:#005c54;color:#fff;\"\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;\"\u003eParameter\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;\"\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eModel \/ MPN\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003eDC180PP\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eCapacity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e180 L\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eErP energy rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003eA\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eDimensions (H × D)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e1165 mm × 595 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eWeight (empty)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e42 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eWeight (full)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e222 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eRecovery time\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e22 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eMax working pressure\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e10 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eT\u0026amp;P relief valve\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e10 bar \/ 90–95 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eThermostat\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003eDigital, adjustable 20–70 °C, preset 60 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eMotorised valve\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003eHoneywell V4043H1056C 2-port\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eExpansion vessel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e12–24 L (included, integral to pre-plumbed assembly)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eInsulation technology\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003eVacuum Insulation Panels + 4th-generation PU foam\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eConnections\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e28 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003ePre-plumbed\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003eYes — integral expansion vessel, cold-feed assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eFeet\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003eAdjustable — factory fitted\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv style=\"background:#008377CF;color:#fff;padding:12px 18px;border-radius:6px;margin:28px 0 16px;font-size:17px;font-weight:700;\"\u003eFrequently Asked Questions\u003c\/div\u003e\n\n\u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;\"\u003e\n  \u003csummary style=\"background:#008377CF;color:#fff;padding:12px 16px;border-radius:5px;cursor:pointer;font-weight:600;list-style:none;\"\u003eWhat makes the OSO Delta A-rated when most cylinders are C-rated?\u003c\/summary\u003e\n  \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eErP heat loss ratings for indirect hot water cylinders are primarily determined by \u003cstrong\u003estanding heat loss in kWh\/24h\u003c\/strong\u003e. The Delta achieves Class A by combining \u003cstrong\u003eVacuum Insulation Panels (VIPs)\u003c\/strong\u003e — panels containing near-vacuum cavities with a thermal conductivity far lower than any foam — with 4th-generation dense polyurethane foam. Together they reduce heat loss to a level that no foam-only design can match. OSO is the only brand offering A-rated cylinders across the full 150–300 L range.\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;\"\u003e\n  \u003csummary style=\"background:#008377CF;color:#fff;padding:12px 16px;border-radius:5px;cursor:pointer;font-weight:600;list-style:none;\"\u003eWhat is the difference between the pre-plumbed (PP) and standard (unplumbed) Delta?\u003c\/summary\u003e\n  \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eThe \u003cstrong\u003epre-plumbed (PP) version\u003c\/strong\u003e — this product — has the integral expansion vessel and cold-feed pre-plumbing factory-assembled. This saves installers from fitting the expansion vessel, hose and inlet group assembly on site, cutting installation time by up to 70%. The unplumbed version gives the installer more flexibility in component positioning but takes longer to install. For new-build programmes, the PP version is the natural choice.\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;\"\u003e\n  \u003csummary style=\"background:#008377CF;color:#fff;padding:12px 16px;border-radius:5px;cursor:pointer;font-weight:600;list-style:none;\"\u003eWho must install an unvented hot water cylinder?\u003c\/summary\u003e\n  \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eInstallation must be carried out by a \u003cstrong\u003eG3-qualified engineer\u003c\/strong\u003e registered under the Building Regulations Part G competent person scheme (or a suitably supervised engineer working under G3 oversight). The Benchmark Commissioning Checklist must be completed and handed to the customer at handover. Non-compliant installation invalidates the warranty and may breach building regulations.\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;\"\u003e\n  \u003csummary style=\"background:#008377CF;color:#fff;padding:12px 16px;border-radius:5px;cursor:pointer;font-weight:600;list-style:none;\"\u003eIs the OSO Delta compatible with heat pumps?\u003c\/summary\u003e\n  \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eYes — the OSO Delta Coil (DC) indirect range is designed to work with \u003cstrong\u003egas, oil and LPG boilers, electric boilers, and air source heat pumps\u003c\/strong\u003e via the single heating coil. For heat pump applications, the recovery time will depend on the heat pump output. If you are pairing with a heat pump, ask about the OSO Supercoil (SC) variant which has a larger coil surface area optimised for the lower flow temperatures typical of heat pumps.\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;\"\u003e\n  \u003csummary style=\"background:#008377CF;color:#fff;padding:12px 16px;border-radius:5px;cursor:pointer;font-weight:600;list-style:none;\"\u003eDoes the OSO Delta need annual servicing?\u003c\/summary\u003e\n  \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eYes — \u003cstrong\u003eannual servicing by a G3-qualified engineer\u003c\/strong\u003e is required. During the annual service, the engineer checks the T\u0026amp;P relief valve, expansion relief valve, PRV, strainer, motorised valve operation, expansion vessel pre-charge, and the digital thermostat settings. The anti-legionella function should also be verified as active.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":64644256956765,"sku":"DC180PP","price":999.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OSOHotWaterDeltaDC300PPPre-plumbedIndirectUnventedHotWaterCylinder.webp?v=1778251960"},{"product_id":"oso-delta-a-rated-300l-pre-plumbed-indirect-unvented-hot-water-cylinder-dc300pp","title":"OSO Delta A-Rated 300L Pre-plumbed Indirect Unvented Hot Water Cylinder DC300PP","description":"\u003cdiv style=\"font-size:16px;font-family:Arial,sans-serif;color:#1a1a1a;max-width:900px;margin:0 auto;line-height:1.6;\"\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eOSO Delta DC300PP\u003c\/strong\u003e is an \u003cstrong\u003eErP A-rated, pre-plumbed indirect unvented hot water cylinder\u003c\/strong\u003e at 300 litres — the largest capacity in OSO's award-winning Delta series. It achieves its Class A energy rating through a combination of \u003cstrong\u003eVacuum Insulation Panels (VIPs)\u003c\/strong\u003e and 4th-generation polyurethane foam — a world first across a full capacity range. The \u003cstrong\u003epre-plumbed (PP) configuration\u003c\/strong\u003e saves up to 70% of installation labour thanks to its factory-assembled integral expansion vessel and cold-feed assembly. At \u003cstrong\u003e595 mm diameter × 1745 mm height\u003c\/strong\u003e and 58 kg empty, it is significantly shorter than most 300-litre competitors, producing the same volume of hot water in a more airing-cupboard-friendly footprint. Suited to \u003cstrong\u003elarge family homes, HMOs, developer new-builds\u003c\/strong\u003e and any installation where hot water demand is high and energy efficiency is paramount.\u003c\/p\u003e\n\n\u003cdiv style=\"display:flex;flex-wrap:wrap;gap:12px;margin:20px 0;\"\u003e\n  \u003cdiv style=\"flex:1;min-width:110px;background:#008377CF;color:#fff;border-radius:8px;padding:14px 10px;text-align:center;\"\u003e\n\u003cdiv style=\"font-size:22px;font-weight:700;\"\u003eErP A\u003c\/div\u003e\n\u003cdiv style=\"font-size:12px;margin-top:4px;\"\u003eEnergy rating\u003c\/div\u003e\n\u003c\/div\u003e\n  \u003cdiv style=\"flex:1;min-width:110px;background:#008377CF;color:#fff;border-radius:8px;padding:14px 10px;text-align:center;\"\u003e\n\u003cdiv style=\"font-size:22px;font-weight:700;\"\u003e300 L\u003c\/div\u003e\n\u003cdiv style=\"font-size:12px;margin-top:4px;\"\u003eCapacity\u003c\/div\u003e\n\u003c\/div\u003e\n  \u003cdiv style=\"flex:1;min-width:110px;background:#008377CF;color:#fff;border-radius:8px;padding:14px 10px;text-align:center;\"\u003e\n\u003cdiv style=\"font-size:22px;font-weight:700;\"\u003e37 min\u003c\/div\u003e\n\u003cdiv style=\"font-size:12px;margin-top:4px;\"\u003eRecovery time\u003c\/div\u003e\n\u003c\/div\u003e\n  \u003cdiv style=\"flex:1;min-width:110px;background:#008377CF;color:#fff;border-radius:8px;padding:14px 10px;text-align:center;\"\u003e\n\u003cdiv style=\"font-size:22px;font-weight:700;\"\u003e1745 mm\u003c\/div\u003e\n\u003cdiv style=\"font-size:12px;margin-top:4px;\"\u003eHeight\u003c\/div\u003e\n\u003c\/div\u003e\n  \u003cdiv style=\"flex:1;min-width:110px;background:#008377CF;color:#fff;border-radius:8px;padding:14px 10px;text-align:center;\"\u003e\n\u003cdiv style=\"font-size:22px;font-weight:700;\"\u003eVIP\u003c\/div\u003e\n\u003cdiv style=\"font-size:12px;margin-top:4px;\"\u003eVacuum Insulation Panels\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"background:#fff3f3;border-left:4px solid #cc0000;padding:14px 16px;border-radius:6px;margin:16px 0;\"\u003e\n  \u003cstrong style=\"color:#cc0000;\"\u003eInstaller requirement:\u003c\/strong\u003e Must be installed by a \u003cstrong\u003eG3-qualified engineer\u003c\/strong\u003e under Building Regulations Part G. Benchmark Commissioning Checklist must be completed and provided to the customer.\n\u003c\/div\u003e\n\n\u003cdiv style=\"background:#fffbea;border-left:4px solid #e6a817;padding:14px 16px;border-radius:6px;margin:16px 0;\"\u003e\n  \u003cstrong style=\"color:#b07d00;\"\u003eStructural note:\u003c\/strong\u003e When full, a 300 L cylinder weighs approximately \u003cstrong\u003e358 kg\u003c\/strong\u003e. Confirm the floor or installation surface can bear this load before installation — particularly in upper-floor plant rooms or loft spaces. A structural assessment may be required.\n\u003c\/div\u003e\n\n\u003cdiv style=\"background:#e6f4f3;border-left:4px solid #008377CF;padding:14px 16px;border-radius:6px;margin:16px 0;\"\u003e\n  \u003cstrong style=\"color:#005c54;\"\u003eShorter than most 300 L competitors:\u003c\/strong\u003e OSO produces up to \u003cstrong\u003e20% more hot water per unit of height\u003c\/strong\u003e. The 300 L Delta at 1745 mm is compact enough for many standard airing cupboards that cannot accommodate taller rivals.\n\u003c\/div\u003e\n\n\u003cdiv style=\"background:#008377CF;color:#fff;padding:12px 18px;border-radius:6px;margin:28px 0 16px;font-size:17px;font-weight:700;\"\u003eKey Features\u003c\/div\u003e\n\u003cdiv style=\"display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;margin-bottom:24px;\"\u003e\n\n  \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:16px;\"\u003e\n    \u003cdiv style=\"font-weight:700;color:#008377;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003eVacuum Insulation Panels — ErP A Rated\u003c\/div\u003e\n    \u003cp style=\"margin:0;font-size:15px;\"\u003eThe OSO Delta is unique in achieving \u003cstrong\u003eErP Class A across its full capacity range\u003c\/strong\u003e. This is made possible by combining \u003cstrong\u003eVacuum Insulation Panels (VIPs)\u003c\/strong\u003e — a technology borrowed from cryogenic engineering — with 4th-generation polyurethane foam. The result is dramatically lower standing heat loss than any C-rated competitor: saving approximately \u003cstrong\u003e1 kWh per day\u003c\/strong\u003e in the popular 210 L size versus a C-rated cylinder. Over a year, that is meaningful energy and cost saving for every household.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:16px;\"\u003e\n    \u003cdiv style=\"font-weight:700;color:#008377;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003eAward-Winning OSO Design\u003c\/div\u003e\n    \u003cp style=\"margin:0;font-size:15px;\"\u003eThe Delta series is \u003cstrong\u003eindustry award-winning\u003c\/strong\u003e and recognised as the most energy-efficient unvented hot water cylinder range available. OSO cylinders are \u003cstrong\u003eshorter than most competitors at equivalent volume\u003c\/strong\u003e — producing up to 20% more hot water per unit of height. This means you can often \u003cstrong\u003edownsize the floor plan footprint\u003c\/strong\u003e when switching to OSO without losing capacity.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:16px;\"\u003e\n    \u003cdiv style=\"font-weight:700;color:#008377;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003ePre-Plumbed — Up to 70% Labour Saving\u003c\/div\u003e\n    \u003cp style=\"margin:0;font-size:15px;\"\u003eThe DC pre-plumbed (PP) configuration includes an \u003cstrong\u003eintegral expansion vessel\u003c\/strong\u003e and pre-fitted cold-feed assembly — saving up to \u003cstrong\u003e70% of installation labour\u003c\/strong\u003e compared to an unplumbed cylinder requiring separate component fitting. This makes the DC PP particularly popular with \u003cstrong\u003ehousebuilders, developers and new-build programmes\u003c\/strong\u003e where installation speed and repeatability matter.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:16px;\"\u003e\n    \u003cdiv style=\"font-weight:700;color:#008377;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003eDigital Thermostat with Anti-Legionella and Holiday Modes\u003c\/div\u003e\n    \u003cp style=\"margin:0;font-size:15px;\"\u003eThe OSO Delta is supplied with a \u003cstrong\u003edigital adjustable thermostat\u003c\/strong\u003e (20–70 °C, preset 60 °C) with built-in \u003cstrong\u003eanti-legionella pasteurisation\u003c\/strong\u003e and \u003cstrong\u003eholiday mode\u003c\/strong\u003e. The anti-legionella cycle automatically heats the cylinder to above 60 °C at set intervals to suppress Legionella bacteria — a requirement under HSG274 guidance for commercial and multi-occupancy buildings.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:16px;\"\u003e\n    \u003cdiv style=\"font-weight:700;color:#008377;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003eHoneywell Motorised Valve Included\u003c\/div\u003e\n    \u003cp style=\"margin:0;font-size:15px;\"\u003eThe pre-plumbed kit includes a \u003cstrong\u003eHoneywell V4043H 2-port motorised valve\u003c\/strong\u003e — a market-standard, widely-stocked component that installers and service engineers are familiar with. If a valve ever needs replacement, sourcing is straightforward from any plumbing merchant. The full G3 kit is included: strainer, PRV, expansion relief valve, drain cock, tundish, T\u0026amp;P relief valve (10 bar \/ 90–95 °C).\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:16px;\"\u003e\n    \u003cdiv style=\"font-weight:700;color:#008377;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003eAdjustable Factory-Fitted Feet\u003c\/div\u003e\n    \u003cp style=\"margin:0;font-size:15px;\"\u003eThe cylinder sits on \u003cstrong\u003efactory-fitted adjustable feet\u003c\/strong\u003e, making it straightforward to level on uneven plant room floors without shimming. The feet also raise the cylinder slightly off the floor, helping to protect against damp and making inspection of the base easier during annual servicing.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\u003cdiv style=\"background:#008377CF;color:#fff;padding:12px 18px;border-radius:6px;margin:28px 0 16px;font-size:17px;font-weight:700;\"\u003eTechnical Specifications — DC300PP\u003c\/div\u003e\n\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:15px;margin-bottom:24px;\"\u003e\n  \u003cthead\u003e\u003ctr style=\"background:#005c54;color:#fff;\"\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;\"\u003eParameter\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;text-align:left;\"\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eModel \/ MPN\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003eDC300PP\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eCapacity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e300 L\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eErP energy rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003eA\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eDimensions (H × D)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e1745 mm × 595 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eWeight (empty)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e58 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eWeight (full, approx)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e~358 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eRecovery time\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e37 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eMax working pressure\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e10 bar\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eT\u0026amp;P relief valve\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e10 bar \/ 90–95 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eThermostat\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003eDigital, adjustable 20–70 °C, preset 60 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eMotorised valve\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003eHoneywell V4043H1056C 2-port\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eExpansion vessel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e12–24 L (included, integral to pre-plumbed assembly)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eInsulation technology\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003eVacuum Insulation Panels + 4th-generation PU foam\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eConnections\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e28 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003ePre-plumbed\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003eYes — integral expansion vessel, cold-feed assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eFeet\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;\"\u003eAdjustable — factory fitted\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv style=\"background:#008377CF;color:#fff;padding:12px 18px;border-radius:6px;margin:28px 0 16px;font-size:17px;font-weight:700;\"\u003eFrequently Asked Questions\u003c\/div\u003e\n\n\u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;\"\u003e\n  \u003csummary style=\"background:#008377CF;color:#fff;padding:12px 16px;border-radius:5px;cursor:pointer;font-weight:600;list-style:none;\"\u003eWhat makes the OSO Delta A-rated when most cylinders are C-rated?\u003c\/summary\u003e\n  \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eErP heat loss ratings for indirect hot water cylinders are primarily determined by \u003cstrong\u003estanding heat loss in kWh\/24h\u003c\/strong\u003e. The Delta achieves Class A by combining \u003cstrong\u003eVacuum Insulation Panels (VIPs)\u003c\/strong\u003e — panels containing near-vacuum cavities with a thermal conductivity far lower than any foam — with 4th-generation dense polyurethane foam. Together they reduce heat loss to a level that no foam-only design can match. OSO is the only brand offering A-rated cylinders across the full 150–300 L range.\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;\"\u003e\n  \u003csummary style=\"background:#008377CF;color:#fff;padding:12px 16px;border-radius:5px;cursor:pointer;font-weight:600;list-style:none;\"\u003eWhat is the difference between the pre-plumbed (PP) and standard (unplumbed) Delta?\u003c\/summary\u003e\n  \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eThe \u003cstrong\u003epre-plumbed (PP) version\u003c\/strong\u003e — this product — has the integral expansion vessel and cold-feed pre-plumbing factory-assembled. This saves installers from fitting the expansion vessel, hose and inlet group assembly on site, cutting installation time by up to 70%. The unplumbed version gives the installer more flexibility in component positioning but takes longer to install. For new-build programmes, the PP version is the natural choice.\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;\"\u003e\n  \u003csummary style=\"background:#008377CF;color:#fff;padding:12px 16px;border-radius:5px;cursor:pointer;font-weight:600;list-style:none;\"\u003eWho must install an unvented hot water cylinder?\u003c\/summary\u003e\n  \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eInstallation must be carried out by a \u003cstrong\u003eG3-qualified engineer\u003c\/strong\u003e registered under the Building Regulations Part G competent person scheme (or a suitably supervised engineer working under G3 oversight). The Benchmark Commissioning Checklist must be completed and handed to the customer at handover. Non-compliant installation invalidates the warranty and may breach building regulations.\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;\"\u003e\n  \u003csummary style=\"background:#008377CF;color:#fff;padding:12px 16px;border-radius:5px;cursor:pointer;font-weight:600;list-style:none;\"\u003eIs the OSO Delta compatible with heat pumps?\u003c\/summary\u003e\n  \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eYes — the OSO Delta Coil (DC) indirect range is designed to work with \u003cstrong\u003egas, oil and LPG boilers, electric boilers, and air source heat pumps\u003c\/strong\u003e via the single heating coil. For heat pump applications, the recovery time will depend on the heat pump output. If you are pairing with a heat pump, ask about the OSO Supercoil (SC) variant which has a larger coil surface area optimised for the lower flow temperatures typical of heat pumps.\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;\"\u003e\n  \u003csummary style=\"background:#008377CF;color:#fff;padding:12px 16px;border-radius:5px;cursor:pointer;font-weight:600;list-style:none;\"\u003eDoes the OSO Delta need annual servicing?\u003c\/summary\u003e\n  \u003cdiv style=\"padding:14px 16px;background:#f9fefe;\"\u003eYes — \u003cstrong\u003eannual servicing by a G3-qualified engineer\u003c\/strong\u003e is required. During the annual service, the engineer checks the T\u0026amp;P relief valve, expansion relief valve, PRV, strainer, motorised valve operation, expansion vessel pre-charge, and the digital thermostat settings. The anti-legionella function should also be verified as active.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e","brand":"OSO Hotwater","offers":[{"title":"Default Title","offer_id":64644274913629,"sku":"DC300PP","price":1700.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/OSOHotWaterDeltaDC300PPPre-plumbedIndirectUnventedHotWaterCylinder.webp?v=1778251960"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/collections\/Oso-Logo.png?v=1769067411","url":"https:\/\/qualityheating.co.uk\/collections\/oso.oembed?page=2","provider":"AIZO Quality Heating","version":"1.0","type":"link"}