{"product_id":"vaillant-unistor-plus-heat-pump-cylinder-150l-300l-standard","title":"Vaillant uniSTOR PLUS Heat Pump Cylinder 150L–300L Standard","description":"\u003cdiv style=\"font-size:16px;font-family:Arial,Helvetica,sans-serif;color:#222;max-width:900px;margin:0 auto;line-height:1.6;\"\u003e\n\n  \u003c!-- INTRO --\u003e\n  \u003cp\u003eThe \u003cstrong\u003eVaillant uniSTOR PLUS Heat Pump Cylinder\u003c\/strong\u003e (standard, non-pre-plumbed) is the \u003cstrong\u003einternal-expansion variant\u003c\/strong\u003e of Vaillant's high-recovery standard cylinder range, available in \u003cstrong\u003e150, 175, 210, 250 and 300 litres\u003c\/strong\u003e. Its defining feature is the \u003cstrong\u003eintegrated internal \"bubble top\" expansion vessel\u003c\/strong\u003e — factory-incorporated within the cylinder body — which eliminates the need for a separate external expansion vessel entirely. The result is a \u003cstrong\u003ecleaner, more compact installation\u003c\/strong\u003e with fewer connections and a smaller plant room footprint: the preferred choice where space around the cylinder is at a premium.\u003c\/p\u003e\n  \u003cp\u003eThe installer connects the supplied tundish, three-way motorised valve, unvented cylinder kit and fittings on site to suit the specific layout. Built around Vaillant's \u003cstrong\u003elarge-diameter smooth-bore coil technology\u003c\/strong\u003e, the uniSTOR PLUS delivers standby losses \u003cstrong\u003eas low as 1.0 kWh\/24 h\u003c\/strong\u003e and coil ratings up to \u003cstrong\u003e52.5 kW\u003c\/strong\u003e. The \u003cstrong\u003e100% recyclable stainless steel inner tank\u003c\/strong\u003e carries a \u003cstrong\u003e25-year anti-corrosion guarantee\u003c\/strong\u003e with a 2-year parts and labour warranty on all other components.\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:140px;background:#008377CF;color:#fff;border-radius:8px;padding:16px 12px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e5\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eCapacities: 150–300 L\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:140px;background:#008377CF;color:#fff;border-radius:8px;padding:16px 12px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003eInternal\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eExpansion Vessel Integrated\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:140px;background:#008377CF;color:#fff;border-radius:8px;padding:16px 12px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e1.0\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003ekWh\/24h min. standby loss\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:140px;background:#008377CF;color:#fff;border-radius:8px;padding:16px 12px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e25yr\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eAnti-Corrosion Guarantee\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:140px;background:#008377CF;color:#fff;border-radius:8px;padding:16px 12px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e\u0026lt;5\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eGWP (Global Warming Potential)\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- CALLOUT: RED --\u003e\n  \u003cdiv style=\"background:#fff5f5;border-left:5px solid #cc0000;padding:14px 18px;border-radius:6px;margin:20px 0;\"\u003e\n    \u003cstrong style=\"color:#cc0000;\"\u003e⚠ Installer Requirement\u003c\/strong\u003e\u003cbr\u003e\n    This is an \u003cstrong\u003eunvented hot water cylinder\u003c\/strong\u003e. Installation, commissioning and servicing must only be carried out by a \u003cstrong\u003eG3-qualified competent person\u003c\/strong\u003e, in accordance with Building Regulations (England \u0026amp; Wales) Part G and the Benchmark Commissioning Checklist. The \u003cstrong\u003einternal expansion vessel pre-charge pressure must be verified and adjusted\u003c\/strong\u003e to match system design requirements during commissioning. All installations must be notified to Local Area Building Control or via a Competent Persons Scheme.\n  \u003c\/div\u003e\n\n  \u003c!-- CALLOUT: AMBER --\u003e\n  \u003cdiv style=\"background:#fffbea;border-left:5px solid #e6a817;padding:14px 18px;border-radius:6px;margin:20px 0;\"\u003e\n    \u003cstrong style=\"color:#b37d00;\"\u003e⚠ Compatibility \u0026amp; Transport Note\u003c\/strong\u003e\u003cbr\u003e\n    The uniSTOR PLUS standard is \u003cstrong\u003edesigned primarily for use with Vaillant heat pumps\u003c\/strong\u003e (aroTHERM plus, aroTHERM split, flexoTHERM). The \u003cstrong\u003e250 L and 300 L models include a secondary return T-piece connection\u003c\/strong\u003e and feature an enlarged coil for compatibility with higher-output ground-source systems. The cylinder must be installed in a \u003cstrong\u003edry, permanently frost-free room\u003c\/strong\u003e. Transport and storage must always be \u003cstrong\u003evertical\u003c\/strong\u003e — laying the cylinder horizontally may damage the internal expansion vessel.\n  \u003c\/div\u003e\n\n  \u003c!-- CALLOUT: TEAL --\u003e\n  \u003cdiv style=\"background:#e6f4f3;border-left:5px solid #008377CF;padding:14px 18px;border-radius:6px;margin:20px 0;\"\u003e\n    \u003cstrong style=\"color:#005c54;\"\u003eℹ PLUS vs PURE — and Standard vs Pre-Plumbed\u003c\/strong\u003e\u003cbr\u003e\n    The \u003cstrong\u003euniSTOR PLUS\u003c\/strong\u003e has an \u003cstrong\u003eintegrated internal \"bubble top\" expansion vessel\u003c\/strong\u003e — no external vessel required, giving the most compact installation footprint. The \u003cstrong\u003euniSTOR PURE\u003c\/strong\u003e uses an external expansion vessel (supplied), which allows flexible positioning but occupies more space. This \u003cstrong\u003estandard (non-pre-plumbed)\u003c\/strong\u003e version supplies the tundish, valve and kit as loose components for on-site connection — ideal where bespoke pipework routing is needed. For a factory-fitted, faster-install option, see the \u003cstrong\u003euniSTOR PLUS Pre-Plumbed\u003c\/strong\u003e.\n  \u003c\/div\u003e\n\n  \u003c!-- FEATURES GRID --\u003e\n  \u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px 6px 0 0;font-weight:700;font-size:16px;margin-top:28px;\"\u003eKey Features \u0026amp; Benefits\u003c\/div\u003e\n  \u003cdiv style=\"display:flex;flex-wrap:wrap;gap:14px;padding:16px 0;\"\u003e\n\n    \u003cdiv style=\"flex:1;min-width:260px;background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;font-size:15px;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003eIntegrated Internal Expansion Vessel\u003c\/div\u003e\n      \u003cp style=\"margin:0;\"\u003eThe uniSTOR PLUS incorporates a \u003cstrong\u003efactory-built internal \"bubble top\" expansion vessel\u003c\/strong\u003e within the cylinder body, completely removing the need for a separate external vessel and its pipe connections. This produces a \u003cstrong\u003esignificantly more compact and tidier installation\u003c\/strong\u003e — fewer components to site, fewer potential leak points, and a smaller overall footprint in the plant room or airing cupboard.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"flex:1;min-width:260px;background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;font-size:15px;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003eComplete System Kit — On-Site Connection\u003c\/div\u003e\n      \u003cp style=\"margin:0;\"\u003eSupplied with a \u003cstrong\u003etundish, three-way motorised valve (28mm), unvented cylinder kit and ¾\" × 28mm MI-copper compression fitting\u003c\/strong\u003e for the installer to connect on site. The \u003cstrong\u003e250 L and 300 L models also include a secondary return T-piece connection\u003c\/strong\u003e for secondary circulation systems. This standard configuration gives the installer full control over pipework routing.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"flex:1;min-width:260px;background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;font-size:15px;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003eLarge-Diameter Smooth-Bore Coil\u003c\/div\u003e\n      \u003cp style=\"margin:0;\"\u003eVaillant's \u003cstrong\u003esmooth-bore coil technology\u003c\/strong\u003e delivers heat exchanger surface areas up to 2.8 m² (300 L) with coil ratings up to 52.5 kW, enabling \u003cstrong\u003erapid re-heat and efficient heat transfer\u003c\/strong\u003e from the connected heat pump. The smooth bore actively resists limescale build-up and promotes \u003cstrong\u003eautomatic self-de-scaling\u003c\/strong\u003e, protecting long-term efficiency without chemical additives.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"flex:1;min-width:260px;background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;font-size:15px;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003eClass-Leading Insulation — from 1.0 kWh\/24h\u003c\/div\u003e\n      \u003cp style=\"margin:0;\"\u003e\u003cstrong\u003eThermal-injected polyurethane insulation combined with vacuum panels\u003c\/strong\u003e achieves standby losses as low as \u003cstrong\u003e1.0 kWh\/24 h\u003c\/strong\u003e on the 150 L model — the lowest in class for this cylinder type. Hot water stays at temperature throughout the day, reducing the frequency of heat pump re-heat cycles and cutting running costs for the homeowner.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"flex:1;min-width:260px;background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;font-size:15px;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003eFactory-Fitted 3 kW Immersion Heater\u003c\/div\u003e\n      \u003cp style=\"margin:0;\"\u003eA \u003cstrong\u003e3.0 kW factory-installed immersion heater\u003c\/strong\u003e (13 A, 1.5 mm² cable, 1¼\" BSP boss) provides emergency backup heating should the primary heat source be temporarily unavailable for servicing. The adjustable thermostat is set during commissioning and meets G3 unvented cylinder safety requirements.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"flex:1;min-width:260px;background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;font-size:15px;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003e25-Year Stainless Steel Guarantee\u003c\/div\u003e\n      \u003cp style=\"margin:0;\"\u003eThe inner cylinder is made from \u003cstrong\u003ehigh-grade 100% recyclable stainless steel\u003c\/strong\u003e with an ultra-hard-wearing outer shell, backed by Vaillant's \u003cstrong\u003e25-year anti-corrosion guarantee\u003c\/strong\u003e. All other components carry a \u003cstrong\u003e2-year parts and labour warranty\u003c\/strong\u003e, providing one of the most comprehensive coverage packages in the UK cylinder market.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"flex:1;min-width:260px;background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;font-size:15px;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003eLow GWP \u0026amp; 100% Recyclable\u003c\/div\u003e\n      \u003cp style=\"margin:0;\"\u003eA \u003cstrong\u003eGlobal Warming Potential (GWP) of less than 5 and zero ozone depletion\u003c\/strong\u003e from the thermal-injected insulation, combined with a fully recyclable stainless steel tank, makes the uniSTOR PLUS one of the most environmentally responsible cylinders available. Suitable for low-carbon heat pump system specifications and sustainability-focused projects.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"flex:1;min-width:260px;background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;font-size:15px;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003eAdjustable Feet \u0026amp; Drain Valve\u003c\/div\u003e\n      \u003cp style=\"margin:0;\"\u003e\u003cstrong\u003eAdjustable levelling feet\u003c\/strong\u003e allow the cylinder to be set plumb on uneven floors without shimming, reducing stress on pipework connections. A pre-fitted \u003cstrong\u003edrain valve\u003c\/strong\u003e enables safe draining during maintenance or when a property is unoccupied in cold weather, supporting the required annual service regime.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"flex:1;min-width:260px;background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;font-size:15px;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003eBenchmark Compliant \u0026amp; HWA Member\u003c\/div\u003e\n      \u003cp style=\"margin:0;\"\u003eThe uniSTOR PLUS meets \u003cstrong\u003eEN 12897:2016\u003c\/strong\u003e, carries \u003cstrong\u003eCE and UKCA marking\u003c\/strong\u003e, and Vaillant is a full member of the \u003cstrong\u003eHot Water Association\u003c\/strong\u003e and a licensed \u003cstrong\u003eBenchmark Scheme\u003c\/strong\u003e member. Suitable for use within \u003cstrong\u003eMCS-certified heat pump installations\u003c\/strong\u003e supporting BUS (Boiler Upgrade Scheme) grant-funded projects.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n  \u003c\/div\u003e\n\n  \u003c!-- VARIANT TABLE — MPN --\u003e\n  \u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px 6px 0 0;font-weight:700;font-size:16px;margin-top:28px;\"\u003eVariant Reference — uniSTOR PLUS Standard (Non-Pre-Plumbed)\u003c\/div\u003e\n  \u003cdiv style=\"overflow-x:auto;\"\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;font-size:14px;\"\u003e\n    \u003cthead\u003e\n      \u003ctr style=\"background:#005c54;color:#fff;text-align:left;\"\u003e\n        \u003cth style=\"padding:10px 12px;\"\u003eCapacity\u003c\/th\u003e\n        \u003cth style=\"padding:10px 12px;\"\u003eVaillant MPN\u003c\/th\u003e\n        \u003cth style=\"padding:10px 12px;\"\u003eModel Code\u003c\/th\u003e\n        \u003cth style=\"padding:10px 12px;\"\u003eEnergy Class\u003c\/th\u003e\n        \u003cth style=\"padding:10px 12px;\"\u003eOuter Diameter (mm)\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003e150 L\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003e8000012315\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eVIH RW 150\/5 B IAES\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eB\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e595\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003e175 L\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003e8000012316\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eVIH RW 175\/5 B IAES\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eB\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e595\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003e210 L\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003e8000012317\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eVIH RW 210\/5 B IAES\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eB\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e595\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003e250 L\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003e8000012318\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eVIH RW 250\/5 C IAES\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eC\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e595\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003e300 L\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003e8000012319\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eVIH RW 300\/5 C IAES\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eC\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e595\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n  \u003c\/div\u003e\n  \u003cp style=\"font-size:13px;color:#555;margin-top:6px;\"\u003eMPN source: Vaillant installation manual 8000014621-07 (July 2025). IAES = Internal expansion vessel (bubble top), Immersion heater, Stainless steel. Do not confuse with the pre-plumbed PLUS range (MPNs 8000012320–8000012324, suffix PPIAES) or the standard PURE range (MPNs 8000011512–8000011516, suffix ES).\u003c\/p\u003e\n\n  \u003c!-- SPEC TABLE --\u003e\n  \u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px 6px 0 0;font-weight:700;font-size:16px;margin-top:28px;\"\u003eTechnical Specifications — uniSTOR PLUS Standard Range\u003c\/div\u003e\n  \u003cdiv style=\"overflow-x:auto;\"\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;font-size:14px;\"\u003e\n    \u003cthead\u003e\n      \u003ctr style=\"background:#005c54;color:#fff;text-align:left;\"\u003e\n        \u003cth style=\"padding:10px 12px;\"\u003eSpecification\u003c\/th\u003e\n        \u003cth style=\"padding:10px 12px;\"\u003e150 L\u003c\/th\u003e\n        \u003cth style=\"padding:10px 12px;\"\u003e175 L\u003c\/th\u003e\n        \u003cth style=\"padding:10px 12px;\"\u003e210 L\u003c\/th\u003e\n        \u003cth style=\"padding:10px 12px;\"\u003e250 L\u003c\/th\u003e\n        \u003cth style=\"padding:10px 12px;\"\u003e300 L\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eTotal Tank Capacity (L)\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e148.6\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~175\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e198.4\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e249.2\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e288.7\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eHot Water Draw-Off (L)\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e127.0\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~152\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e172.5\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e211.0\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e230.9\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eStandby Losses (kWh\/24h)\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e1.0\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~1.1\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e1.2\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e1.4\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e1.6\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eReheat Time 70% (min)\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e13.8\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~14.2\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e14.6\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e10.6\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e7.5\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eCoil Rating (kW)\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e20.8\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~24\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e26.0\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e40.7\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e52.5\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eHeat Exchanger Surface (m²)\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e1.0\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~1.2\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e1.4\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e2.4\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e2.8\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003ePrimary Flow Rate (L\/h)\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e900\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e900\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e900\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e900\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e1,300\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eHeat Exchanger Pressure Drop (mbar)\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e44\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~70\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e100\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e170\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e200\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eExpansion Vessel Type\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd colspan=\"5\" style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eInternal \"bubble top\" — factory-integrated, no external vessel required\u003c\/strong\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eMax DHW Operating Temp (°C)\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd colspan=\"5\" style=\"padding:9px 12px;\"\u003e85\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eMax Heat Circuit Temp (°C)\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd colspan=\"5\" style=\"padding:9px 12px;\"\u003e95\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eImmersion Heater Rating (kW)\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd colspan=\"5\" style=\"padding:9px 12px;\"\u003e3.0 (boss: 1¼\" BSP female)\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eOuter Diameter with Insulation (mm)\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd colspan=\"5\" style=\"padding:9px 12px;\"\u003e595\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eCold \/ Hot Water Connection\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd colspan=\"5\" style=\"padding:9px 12px;\"\u003e¾\" BSP female\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eNet Weight Empty (kg)\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~38\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~42\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~46\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~61\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~68\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eHeight with Insulation (mm)\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e1,000\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~1,100\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e1,265\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e1,535\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e1,745\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eInsulation Thickness (mm)\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd colspan=\"5\" style=\"padding:9px 12px;\"\u003e50\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eStandard Compliance\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd colspan=\"5\" style=\"padding:9px 12px;\"\u003eEN 12897:2016 | CE \u0026amp; UKCA Marked | Benchmark Compliant | HWA Member\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n  \u003c\/div\u003e\n  \u003cp style=\"font-size:13px;color:#555;margin-top:6px;\"\u003e* 175 L values are indicative, interpolated from verified 150 L and 210 L data. Height for PLUS standard is the same as the PURE standard equivalent as both share the same cylinder body; the internal expansion vessel is housed within the overall height. Always confirm specifications with the current Vaillant uniSTOR PLUS technical documentation for your specific model before specification.\u003c\/p\u003e\n\n  \u003c!-- FAQ --\u003e\n  \u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px 6px 0 0;font-weight:700;font-size:16px;margin-top:28px;\"\u003eFrequently Asked Questions\u003c\/div\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-top:none;padding:14px 16px;background:#fff;\"\u003e\n    \u003csummary style=\"font-weight:700;cursor:pointer;color:#005c54;\"\u003eWhat is the key difference between the uniSTOR PLUS and uniSTOR PURE standard cylinders?\u003c\/summary\u003e\n    \u003cp style=\"margin:10px 0 0;\"\u003eThe \u003cstrong\u003euniSTOR PLUS has an integrated internal \"bubble top\" expansion vessel\u003c\/strong\u003e built into the cylinder body, so \u003cstrong\u003eno separate external expansion vessel is needed\u003c\/strong\u003e — fewer components, fewer connections, smaller footprint. The \u003cstrong\u003euniSTOR PURE uses an external expansion vessel\u003c\/strong\u003e (supplied) connected on site, which allows the installer to position it wherever best suits the plant room but requires more space and one additional connection. Both share the same stainless steel cylinder, coil technology, insulation and guarantee terms.\u003c\/p\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-top:none;padding:14px 16px;background:#f0faf9;\"\u003e\n    \u003csummary style=\"font-weight:700;cursor:pointer;color:#005c54;\"\u003eWhat is supplied in the box, and what does the installer connect on site?\u003c\/summary\u003e\n    \u003cp style=\"margin:10px 0 0;\"\u003eThe standard uniSTOR PLUS is supplied with a \u003cstrong\u003etundish, 28mm three-way motorised valve, G3 unvented cylinder kit, and ¾\" × 28mm MI-copper compression fitting\u003c\/strong\u003e for the installer to connect on site. The 250 L and 300 L models also include a \u003cstrong\u003esecondary return T-piece connection\u003c\/strong\u003e. The \u003cstrong\u003einternal expansion vessel, 3.0 kW immersion heater, T\u0026amp;P relief valve and drain valve are all factory-fitted\u003c\/strong\u003e to the cylinder. The installer routes and connects all supplied components to match the specific plant room layout.\u003c\/p\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-top:none;padding:14px 16px;background:#fff;\"\u003e\n    \u003csummary style=\"font-weight:700;cursor:pointer;color:#005c54;\"\u003eWhich Vaillant heat pumps is the uniSTOR PLUS standard compatible with?\u003c\/summary\u003e\n    \u003cp style=\"margin:10px 0 0;\"\u003eThe uniSTOR PLUS standard is \u003cstrong\u003edesigned to work with Vaillant heat pumps\u003c\/strong\u003e, including the \u003cstrong\u003earoTHERM plus\u003c\/strong\u003e (3.5–12 kW), \u003cstrong\u003earoTHERM split\u003c\/strong\u003e (3.5–12 kW) and \u003cstrong\u003eflexoTHERM\u003c\/strong\u003e ground-source heat pump (5–19 kW). The \u003cstrong\u003e250 L and 300 L models feature an enlarged coil\u003c\/strong\u003e for compatibility with the higher outputs of ground-source systems. Always use the Vaillant cylinder compatibility matrix to match the cylinder size to the specific heat pump output and system design.\u003c\/p\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-top:none;padding:14px 16px;background:#f0faf9;\"\u003e\n    \u003csummary style=\"font-weight:700;cursor:pointer;color:#005c54;\"\u003eWhy choose the standard PLUS over the PLUS Pre-Plumbed?\u003c\/summary\u003e\n    \u003cp style=\"margin:10px 0 0;\"\u003eThe \u003cstrong\u003estandard uniSTOR PLUS\u003c\/strong\u003e is preferred when the installer needs \u003cstrong\u003efull flexibility over pipework routing\u003c\/strong\u003e — for example, where the pre-plumbed connection positions do not suit the plant room layout, or where a bespoke system design is required. The \u003cstrong\u003ePLUS Pre-Plumbed\u003c\/strong\u003e is faster to install and better suited to straightforward, standard layouts where saving time on site is the priority.\u003c\/p\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-top:none;padding:14px 16px;background:#fff;\"\u003e\n    \u003csummary style=\"font-weight:700;cursor:pointer;color:#005c54;\"\u003eWhat guarantee does the standard uniSTOR PLUS carry?\u003c\/summary\u003e\n    \u003cp style=\"margin:10px 0 0;\"\u003eVaillant provides a \u003cstrong\u003e25-year anti-corrosion guarantee on the stainless steel inner tank\u003c\/strong\u003e and a \u003cstrong\u003e2-year parts and labour warranty on all other components\u003c\/strong\u003e, including the internal expansion vessel. Full warranty coverage requires installation by a G3-qualified competent person, commissioning in line with the Benchmark Checklist, and annual inspection by a competent person. The completed Benchmark Checklist must be retained by the homeowner.\u003c\/p\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails style=\"border:1px solid #c8e6e3;border-top:none;padding:14px 16px;background:#f0faf9;border-radius:0 0 6px 6px;\"\u003e\n    \u003csummary style=\"font-weight:700;cursor:pointer;color:#005c54;\"\u003eHow do I choose the right capacity uniSTOR PLUS for my property?\u003c\/summary\u003e\n    \u003cp style=\"margin:10px 0 0;\"\u003eAs a general guide: \u003cstrong\u003e150 L\u003c\/strong\u003e suits 1–2 bedroom homes with one bathroom; \u003cstrong\u003e175–210 L\u003c\/strong\u003e suits 3-bedroom homes with 1–2 bathrooms; \u003cstrong\u003e250 L\u003c\/strong\u003e suits larger 3–4 bedroom properties; \u003cstrong\u003e300 L\u003c\/strong\u003e is recommended for 4+ bedroom homes or properties with higher daily hot-water demand. Always cross-reference with the connected heat pump output and the number of occupants and bathrooms using the Vaillant cylinder compatibility matrix.\u003c\/p\u003e\n  \u003c\/details\u003e\n\n\u003c\/div\u003e","brand":"Vaillant","offers":[{"title":"150L PLUS","offer_id":64701634085213,"sku":"8000012315","price":1470.0,"currency_code":"GBP","in_stock":true},{"title":"175L PLUS","offer_id":64701634117981,"sku":"8000012316","price":1550.0,"currency_code":"GBP","in_stock":true},{"title":"210L PLUS","offer_id":64701634150749,"sku":"8000012317","price":1495.0,"currency_code":"GBP","in_stock":true},{"title":"250L PLUS","offer_id":64701634183517,"sku":"8000012318","price":1795.0,"currency_code":"GBP","in_stock":true},{"title":"300L PLUS","offer_id":64701634216285,"sku":"8000012319","price":1895.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/Vaillant-uniSTOR-Pure-HP-150-Litre-Cylinder.webp?v=1778843411","url":"https:\/\/qualityheating.co.uk\/products\/vaillant-unistor-plus-heat-pump-cylinder-150l-300l-standard","provider":"AIZO Quality Heating","version":"1.0","type":"link"}