{"product_id":"ultraflow-horizontal-indirect-unvented-hot-water-cylinder-120l-500l","title":"Ultraflow Horizontal Indirect Unvented Hot Water Cylinder 120L–500L","description":"\u003cdiv style=\"font-size:16px;line-height:1.6;color:#1a1a1a;font-family:Arial,sans-serif;max-width:900px;margin:0 auto;\"\u003e\n\n  \u003c!-- Intro --\u003e\n  \u003cp style=\"font-size:1.05em;margin-bottom:20px;\"\u003e\n    The \u003cstrong\u003eUltraflow Horizontal Indirect Unvented Hot Water Cylinder\u003c\/strong\u003e is a UK-manufactured, duplex stainless steel hot water storage solution built specifically for installations where headroom is limited or a conventional upright cylinder simply will not fit. Available in capacities from \u003cstrong\u003e120 to 500 litres\u003c\/strong\u003e, the range covers everything from a compact two-bedroom flat to a large family home. Every cylinder is supplied complete with a \u003cstrong\u003efull G3-compliant unvented kit\u003c\/strong\u003e, mounting cradles, and a highly efficient indirect coil — and is backed by an industry-leading \u003cstrong\u003e25-year cylinder warranty\u003c\/strong\u003e.\n  \u003c\/p\u003e\n\n  \u003c!-- Badge strip --\u003e\n  \u003cdiv style=\"display:flex;flex-wrap:wrap;gap:8px;margin-bottom:24px;\"\u003e\n    \u003cspan style=\"background:#008377CF;color:#fff;padding:5px 14px;border-radius:20px;font-size:0.82em;font-weight:600;\"\u003e120L–500L\u003c\/span\u003e\n    \u003cspan style=\"background:#008377CF;color:#fff;padding:5px 14px;border-radius:20px;font-size:0.82em;font-weight:600;\"\u003eDuplex Stainless Steel\u003c\/span\u003e\n    \u003cspan style=\"background:#008377CF;color:#fff;padding:5px 14px;border-radius:20px;font-size:0.82em;font-weight:600;\"\u003e25-Year Cylinder Warranty\u003c\/span\u003e\n    \u003cspan style=\"background:#008377CF;color:#fff;padding:5px 14px;border-radius:20px;font-size:0.82em;font-weight:600;\"\u003eWRAS Approved\u003c\/span\u003e\n    \u003cspan style=\"background:#008377CF;color:#fff;padding:5px 14px;border-radius:20px;font-size:0.82em;font-weight:600;\"\u003eErP Compliant\u003c\/span\u003e\n    \u003cspan style=\"background:#008377CF;color:#fff;padding:5px 14px;border-radius:20px;font-size:0.82em;font-weight:600;\"\u003eG3 Unvented Kit Included\u003c\/span\u003e\n    \u003cspan style=\"background:#008377CF;color:#fff;padding:5px 14px;border-radius:20px;font-size:0.82em;font-weight:600;\"\u003eMade in the UK\u003c\/span\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Stat tiles --\u003e\n  \u003cdiv style=\"display:flex;flex-wrap:wrap;gap:12px;margin-bottom:30px;\"\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:6px;padding:16px 10px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:1.7em;font-weight:700;line-height:1.1;\"\u003e120–500L\u003c\/div\u003e\n      \u003cdiv style=\"font-size:0.8em;margin-top:5px;opacity:0.9;\"\u003eCapacity Range\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:6px;padding:16px 10px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:1.7em;font-weight:700;line-height:1.1;\"\u003e25 Yrs\u003c\/div\u003e\n      \u003cdiv style=\"font-size:0.8em;margin-top:5px;opacity:0.9;\"\u003eCylinder Warranty\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:6px;padding:16px 10px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:1.7em;font-weight:700;line-height:1.1;\"\u003e50mm\u003c\/div\u003e\n      \u003cdiv style=\"font-size:0.8em;margin-top:5px;opacity:0.9;\"\u003eFoam Insulation\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:6px;padding:16px 10px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:1.7em;font-weight:700;line-height:1.1;\"\u003e3kW\u003c\/div\u003e\n      \u003cdiv style=\"font-size:0.8em;margin-top:5px;opacity:0.9;\"\u003eIncoloy Immersion\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:120px;background:#008377CF;color:#fff;border-radius:6px;padding:16px 10px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:1.7em;font-weight:700;line-height:1.1;\"\u003eG3\u003c\/div\u003e\n      \u003cdiv style=\"font-size:0.8em;margin-top:5px;opacity:0.9;\"\u003eBuilding Regs Compliant\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Why horizontal --\u003e\n  \u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px 6px 0 0;\"\u003e\n    \u003cstrong style=\"font-size:1.05em;\"\u003eWhy Choose a Horizontal Cylinder?\u003c\/strong\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"border:1px solid #008377CF;border-top:none;border-radius:0 0 6px 6px;padding:20px;margin-bottom:26px;\"\u003e\n    \u003cp style=\"margin:0 0 12px;\"\u003e\n      Horizontal cylinders solve a very specific problem: \u003cstrong\u003elimited vertical headroom\u003c\/strong\u003e. Loft conversions, plant rooms with low ceiling joists, cupboards beneath stairs, and boiler-adjacent utility spaces often cannot accommodate a tall upright cylinder. The Ultraflow horizontal range is mounted on its side using \u003cstrong\u003esupplied cradles\u003c\/strong\u003e — positioned wherever the available horizontal run allows — without sacrificing any of the performance expected from a high-quality unvented system.\n    \u003c\/p\u003e\n    \u003cp style=\"margin:0;\"\u003e\n      Manufactured from \u003cstrong\u003eduplex stainless steel\u003c\/strong\u003e and insulated with \u003cstrong\u003e50mm closed-cell foam\u003c\/strong\u003e, these cylinders deliver the same excellent heat retention, corrosion resistance, and reheat performance as Ultraflow's upright counterparts. The \u003cstrong\u003ehighly efficient indirect coil\u003c\/strong\u003e ensures rapid heat transfer from any boiler or primary heat source, while the complete G3 kit means the installer arrives with everything needed to commission a compliant unvented installation.\n    \u003c\/p\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;\"\u003e\n    \u003cstrong style=\"font-size:1.05em;\"\u003eKey Features \u0026amp; Benefits\u003c\/strong\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"border:1px solid #008377CF;border-top:none;border-radius:0 0 6px 6px;padding:18px;margin-bottom:26px;\"\u003e\n    \u003cdiv style=\"display:flex;flex-wrap:wrap;gap:12px;\"\u003e\n\n      \u003cdiv style=\"flex:1;min-width:220px;background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:16px;\"\u003e\n        \u003cdiv style=\"font-weight:700;color:#005c54;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:8px;\"\u003eDuplex Stainless Steel Construction\u003c\/div\u003e\n        \u003cp style=\"margin:0;font-size:0.93em;\"\u003e\u003cstrong\u003eDuplex stainless steel offers superior corrosion resistance\u003c\/strong\u003e compared with standard 316L grades — a significant advantage in hard-water areas and wherever aggressive water chemistry could compromise a conventional cylinder over time. The material is specified for longevity, not just compliance, which is why Ultraflow can back it with a \u003cstrong\u003e25-year cylinder guarantee\u003c\/strong\u003e.\u003c\/p\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv style=\"flex:1;min-width:220px;background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:16px;\"\u003e\n        \u003cdiv style=\"font-weight:700;color:#005c54;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:8px;\"\u003eHorizontal Orientation with Mounting Cradles\u003c\/div\u003e\n        \u003cp style=\"margin:0;font-size:0.93em;\"\u003eAll horizontal cylinders are \u003cstrong\u003esupplied with mounting cradles as standard\u003c\/strong\u003e. The cradles add 105mm to the installed height (i.e. the cylinder diameter plus cradle depth) and allow the cylinder to be secured safely on its side without the need for bespoke fabrication on site.\u003c\/p\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv style=\"flex:1;min-width:220px;background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:16px;\"\u003e\n        \u003cdiv style=\"font-weight:700;color:#005c54;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:8px;\"\u003eComplete G3 Unvented Kit Supplied\u003c\/div\u003e\n        \u003cp style=\"margin:0;font-size:0.93em;\"\u003eEvery cylinder ships with a \u003cstrong\u003efull high-quality unvented kit\u003c\/strong\u003e — including the pressure reducing valve, expansion vessel, inlet control set, tundish, T\u0026amp;P relief valve, and associated fittings — so the installer has everything needed to commission a G3-compliant installation straight from the box.\u003c\/p\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv style=\"flex:1;min-width:220px;background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:16px;\"\u003e\n        \u003cdiv style=\"font-weight:700;color:#005c54;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:8px;\"\u003eHighly Efficient Indirect Coil\u003c\/div\u003e\n        \u003cp style=\"margin:0;font-size:0.93em;\"\u003eThe \u003cstrong\u003elarge-surface-area primary coil\u003c\/strong\u003e ensures fast heat transfer from the boiler into stored water, \u003cstrong\u003eminimising reheat time and reducing fuel consumption\u003c\/strong\u003e. Coil ratings range from 15.8kW (120L) up to 28.49kW (500L), delivering rapid recovery even during periods of high demand.\u003c\/p\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv style=\"flex:1;min-width:220px;background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:16px;\"\u003e\n        \u003cdiv style=\"font-weight:700;color:#005c54;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:8px;\"\u003e50mm Closed-Cell Foam Insulation\u003c\/div\u003e\n        \u003cp style=\"margin:0;font-size:0.93em;\"\u003e\u003cstrong\u003e50mm of premium closed-cell foam insulation\u003c\/strong\u003e wraps the full body of every cylinder, minimising standing heat losses and keeping stored water at temperature for longer — translating directly into \u003cstrong\u003elower energy bills\u003c\/strong\u003e across the life of the product.\u003c\/p\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv style=\"flex:1;min-width:220px;background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:16px;\"\u003e\n        \u003cdiv style=\"font-weight:700;color:#005c54;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:8px;\"\u003e3kW Incoloy Immersion Heater\u003c\/div\u003e\n        \u003cp style=\"margin:0;font-size:0.93em;\"\u003eA \u003cstrong\u003ehigh-quality 3kW Incoloy immersion heater\u003c\/strong\u003e is fitted as standard, providing a direct electric backup heat source independent of the boiler. \u003cstrong\u003eCylinders 150L and above are supplied with two immersion heaters\u003c\/strong\u003e for top-and-bottom flexibility and legionella control compliance.\u003c\/p\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv style=\"flex:1;min-width:220px;background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:16px;\"\u003e\n        \u003cdiv style=\"font-weight:700;color:#005c54;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:8px;\"\u003eMechanical Cylinder Thermostat\u003c\/div\u003e\n        \u003cp style=\"margin:0;font-size:0.93em;\"\u003eA \u003cstrong\u003emechanical cylinder thermostat is included\u003c\/strong\u003e as standard, giving accurate temperature monitoring and control of the immersion heating circuit. This supports compliance with HSE legionella guidance on maintaining stored water at 60°C.\u003c\/p\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv style=\"flex:1;min-width:220px;background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:16px;\"\u003e\n        \u003cdiv style=\"font-weight:700;color:#005c54;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:8px;\"\u003eSecondary Return — 200L and Above\u003c\/div\u003e\n        \u003cp style=\"margin:0;font-size:0.93em;\"\u003e\u003cstrong\u003eA secondary return connection is fitted as standard on 200L and above\u003c\/strong\u003e, enabling a secondary circulation loop for instant-hot-water performance across larger properties without the need for a modified cylinder or additional fitting.\u003c\/p\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv style=\"flex:1;min-width:220px;background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:16px;\"\u003e\n        \u003cdiv style=\"font-weight:700;color:#005c54;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:8px;\"\u003eWRAS Approved \u0026amp; ErP Compliant\u003c\/div\u003e\n        \u003cp style=\"margin:0;font-size:0.93em;\"\u003eAll cylinders carry \u003cstrong\u003eWRAS approval\u003c\/strong\u003e and are manufactured to \u003cstrong\u003eBS EN 12897:2006 and 12897:2016\u003c\/strong\u003e, with full ErP energy labelling. Building Regulations compliance (Part L and G3) is verified by NSF Labs, making specification and sign-off straightforward for both installer and Building Control.\u003c\/p\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv style=\"flex:1;min-width:220px;background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:16px;\"\u003e\n        \u003cdiv style=\"font-weight:700;color:#005c54;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:8px;\"\u003eUK Manufactured \u0026amp; UK Stocked\u003c\/div\u003e\n        \u003cp style=\"margin:0;font-size:0.93em;\"\u003eUltraflow cylinders are \u003cstrong\u003emanufactured in the UK\u003c\/strong\u003e and held in significant stock at distribution centres in Enfield and Northampton. \u003cstrong\u003eSame-day or next-day despatch\u003c\/strong\u003e is available on most lines, minimising downtime on site and supporting fast-turnaround jobs.\u003c\/p\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv style=\"flex:1;min-width:220px;background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:16px;\"\u003e\n        \u003cdiv style=\"font-weight:700;color:#005c54;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:8px;\"\u003eUpgrade Options Available\u003c\/div\u003e\n        \u003cp style=\"margin:0;font-size:0.93em;\"\u003eCylinders can be specified with optional upgrades on request: \u003cstrong\u003eHighflow 1\" hot and cold connections with 28mm inlet group\u003c\/strong\u003e, 6kW Incoloy immersion, 3kW or 6kW Titanium immersion elements, additional immersion heaters, and a \u003cstrong\u003elarger capacity expansion vessel\u003c\/strong\u003e for high-volume systems.\u003c\/p\u003e\n      \u003c\/div\u003e\n\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Installer callout --\u003e\n  \u003cdiv style=\"background:#fff0f0;border-left:4px solid #cc0000;padding:14px 18px;border-radius:4px;margin-bottom:18px;\"\u003e\n    \u003cstrong style=\"color:#cc0000;\"\u003eInstaller Notice\u003c\/strong\u003e\u003cbr\u003e\n    \u003cspan style=\"font-size:0.93em;\"\u003eUnvented hot water cylinders \u003cstrong\u003emust be installed by a qualified unvented cylinder engineer\u003c\/strong\u003e holding a current G3 competency certificate (e.g. CIPHE, BPEC, City \u0026amp; Guilds 6089 or equivalent). Installation must comply with \u003cstrong\u003ePart G of the Building Regulations\u003c\/strong\u003e and the Water Supply (Water Fittings) Regulations 1999. All dimensions in the specification table are to be used as guidelines only.\u003c\/span\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Dimension note --\u003e\n  \u003cdiv style=\"background:#fff8e1;border-left:4px solid #f59e0b;padding:14px 18px;border-radius:4px;margin-bottom:26px;\"\u003e\n    \u003cstrong style=\"color:#b45309;\"\u003eImportant: Installed Height\u003c\/strong\u003e\u003cbr\u003e\n    \u003cspan style=\"font-size:0.93em;\"\u003eAll horizontal cylinders are supplied with mounting cradles. \u003cstrong\u003eAdd 105mm to the cylinder diameter to calculate the installed footprint height\u003c\/strong\u003e — a 545mm diameter cylinder on its cradles occupies approximately 650mm of vertical clearance; the 690mm diameter models (400L and 500L) require approximately 795mm. Confirm headroom before ordering.\u003c\/span\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Spec table --\u003e\n  \u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px 6px 0 0;\"\u003e\n    \u003cstrong style=\"font-size:1.05em;\"\u003eTechnical Specification — Standard Horizontal Indirect Unvented\u003c\/strong\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"border:1px solid #008377CF;border-top:none;border-radius:0 0 6px 6px;overflow:auto;margin-bottom:26px;\"\u003e\n    \u003ctable style=\"width:100%;border-collapse:collapse;font-size:0.88em;min-width:700px;\"\u003e\n      \u003cthead\u003e\n        \u003ctr style=\"background:#005c54;color:#fff;\"\u003e\n          \u003cth style=\"padding:9px 12px;text-align:left;white-space:nowrap;\"\u003eCapacity\u003c\/th\u003e\n          \u003cth style=\"padding:9px 12px;text-align:left;white-space:nowrap;\"\u003eCode\u003c\/th\u003e\n          \u003cth style=\"padding:9px 12px;text-align:left;white-space:nowrap;\"\u003eDiameter (mm)\u003c\/th\u003e\n          \u003cth style=\"padding:9px 12px;text-align:left;white-space:nowrap;\"\u003eLength (mm)\u003c\/th\u003e\n          \u003cth style=\"padding:9px 12px;text-align:left;white-space:nowrap;\"\u003eCoil Rating (kW)\u003c\/th\u003e\n          \u003cth style=\"padding:9px 12px;text-align:left;white-space:nowrap;\"\u003eReheat (mins)\u003c\/th\u003e\n          \u003cth style=\"padding:9px 12px;text-align:left;white-space:nowrap;\"\u003eImmersions\u003c\/th\u003e\n          \u003cth style=\"padding:9px 12px;text-align:left;white-space:nowrap;\"\u003eHeat Loss (kWh\/24h)\u003c\/th\u003e\n          \u003cth style=\"padding:9px 12px;text-align:left;white-space:nowrap;\"\u003eErP\u003c\/th\u003e\n          \u003cth style=\"padding:9px 12px;text-align:left;white-space:nowrap;\"\u003eWeight (kg)\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;font-weight:600;\"\u003e120L\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003eUIH120\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e545\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e915\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e15.80\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e17\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e1\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e1.30\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003eC\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e27\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#ffffff;\"\u003e\n          \u003ctd style=\"padding:9px 12px;font-weight:600;\"\u003e150L\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003eUIH150\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e545\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e1100\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e16.50\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e22\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003e2\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e1.56\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003eC\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e33\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#f0faf9;\"\u003e\n          \u003ctd style=\"padding:9px 12px;font-weight:600;\"\u003e180L\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003eUIH180\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e545\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e1284\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e18.00\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e22\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003e2\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e1.66\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003eC\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e39\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#ffffff;\"\u003e\n          \u003ctd style=\"padding:9px 12px;font-weight:600;\"\u003e200L\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003eUIH200\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e545\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e1414\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e19.94\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e25\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003e2\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e1.87\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003eC\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e40\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#f0faf9;\"\u003e\n          \u003ctd style=\"padding:9px 12px;font-weight:600;\"\u003e250L\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003eUIH250\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e545\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e1722\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e20.68\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e28\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003e2\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e2.11\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003eC\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e46\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#ffffff;\"\u003e\n          \u003ctd style=\"padding:9px 12px;font-weight:600;\"\u003e300L\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003eUIH300\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e545\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e1975\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e23.57\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e32\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003e2\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e2.30\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003eC\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e50\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#f0faf9;\"\u003e\n          \u003ctd style=\"padding:9px 12px;font-weight:600;\"\u003e400L \u003cspan style=\"font-size:0.82em;color:#005c54;\"\u003e(1\" connections)\u003c\/span\u003e\n\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003eUIH400\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003e690\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e1580\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e27.58\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e52\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003e2\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e2.42\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003eC\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e76\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#ffffff;\"\u003e\n          \u003ctd style=\"padding:9px 12px;font-weight:600;\"\u003e500L \u003cspan style=\"font-size:0.82em;color:#005c54;\"\u003e(1\" connections)\u003c\/span\u003e\n\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003eUIH500\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003e690\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e1910\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e28.49\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e54\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003e2\u003c\/strong\u003e\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e2.56\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003eC\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 12px;\"\u003e92\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Common spec block --\u003e\n  \u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px 6px 0 0;\"\u003e\n    \u003cstrong style=\"font-size:1.05em;\"\u003eCommon Specifications\u003c\/strong\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"border:1px solid #008377CF;border-top:none;border-radius:0 0 6px 6px;overflow:hidden;margin-bottom:26px;\"\u003e\n    \u003ctable style=\"width:100%;border-collapse:collapse;font-size:0.93em;\"\u003e\n      \u003ctbody\u003e\n        \u003ctr style=\"background:#f0faf9;\"\u003e\n          \u003ctd style=\"padding:9px 16px;font-weight:600;width:55%;\"\u003eConstruction Material\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 16px;\"\u003e\u003cstrong\u003eDuplex Stainless Steel\u003c\/strong\u003e\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#ffffff;\"\u003e\n          \u003ctd style=\"padding:9px 16px;font-weight:600;\"\u003eCylinder Warranty\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 16px;\"\u003e\u003cstrong\u003e25 Years\u003c\/strong\u003e\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#f0faf9;\"\u003e\n          \u003ctd style=\"padding:9px 16px;font-weight:600;\"\u003eParts Warranty\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 16px;\"\u003e2 Years\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#ffffff;\"\u003e\n          \u003ctd style=\"padding:9px 16px;font-weight:600;\"\u003eInsulation Thickness\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 16px;\"\u003e\u003cstrong\u003e50mm closed-cell foam\u003c\/strong\u003e\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#f0faf9;\"\u003e\n          \u003ctd style=\"padding:9px 16px;font-weight:600;\"\u003eImmersion Heater\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 16px;\"\u003e3kW Incoloy (1x on 120L; 2x on 150L–500L)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#ffffff;\"\u003e\n          \u003ctd style=\"padding:9px 16px;font-weight:600;\"\u003eHot Draw \u0026amp; Cold Feed (120L–300L)\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 16px;\"\u003e¾\" compression\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#f0faf9;\"\u003e\n          \u003ctd style=\"padding:9px 16px;font-weight:600;\"\u003eHot Draw \u0026amp; Cold Feed (400L–500L)\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 16px;\"\u003e\u003cstrong\u003e1\" (1\" hot outlet and cold feed as standard)\u003c\/strong\u003e\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#ffffff;\"\u003e\n          \u003ctd style=\"padding:9px 16px;font-weight:600;\"\u003eSecondary Return \u0026amp; Coil Connections\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 16px;\"\u003e¾\" compression\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#f0faf9;\"\u003e\n          \u003ctd style=\"padding:9px 16px;font-weight:600;\"\u003eImmersion Heater Boss\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 16px;\"\u003e1¾\" female\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#ffffff;\"\u003e\n          \u003ctd style=\"padding:9px 16px;font-weight:600;\"\u003eT\u0026amp;P Relief Valve Connection\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 16px;\"\u003e½\" female\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#f0faf9;\"\u003e\n          \u003ctd style=\"padding:9px 16px;font-weight:600;\"\u003eSecondary Return\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 16px;\"\u003eStandard on 200L and above\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#ffffff;\"\u003e\n          \u003ctd style=\"padding:9px 16px;font-weight:600;\"\u003eMounting Cradles\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 16px;\"\u003e\n\u003cstrong\u003eSupplied as standard\u003c\/strong\u003e (add 105mm to diameter for installed height)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#f0faf9;\"\u003e\n          \u003ctd style=\"padding:9px 16px;font-weight:600;\"\u003eUnvented Kit\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 16px;\"\u003e\n\u003cstrong\u003eSupplied complete\u003c\/strong\u003e — G3 Building Regulations compliant\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#ffffff;\"\u003e\n          \u003ctd style=\"padding:9px 16px;font-weight:600;\"\u003eMechanical Cylinder Thermostat\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 16px;\"\u003eIncluded\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#f0faf9;\"\u003e\n          \u003ctd style=\"padding:9px 16px;font-weight:600;\"\u003eManufacturing Standard\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 16px;\"\u003eBS EN 12897:2006 \u0026amp; 12897:2016\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#ffffff;\"\u003e\n          \u003ctd style=\"padding:9px 16px;font-weight:600;\"\u003eApprovals\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 16px;\"\u003eWRAS Approved; ErP Compliant; NSF Labs Building Regs Certified\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#f0faf9;\"\u003e\n          \u003ctd style=\"padding:9px 16px;font-weight:600;\"\u003eCountry of Manufacture\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 16px;\"\u003eUnited Kingdom\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr style=\"background:#ffffff;\"\u003e\n          \u003ctd style=\"padding:9px 16px;font-weight:600;\"\u003eAvailable Upgrades\u003c\/td\u003e\n          \u003ctd style=\"padding:9px 16px;\"\u003eHighflow 1\" connections \u0026amp; 28mm inlet group; 6kW Incoloy immersion; 3kW or 6kW Titanium immersion; extra immersion(s); larger expansion vessel\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- FAQ --\u003e\n  \u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px 6px 0 0;\"\u003e\n    \u003cstrong style=\"font-size:1.05em;\"\u003eFrequently Asked Questions\u003c\/strong\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"border:1px solid #008377CF;border-top:none;border-radius:0 0 6px 6px;padding:8px 16px;margin-bottom:26px;\"\u003e\n\n    \u003cdetails style=\"border-bottom:1px solid #c8e6e3;padding:12px 0;\"\u003e\n      \u003csummary style=\"cursor:pointer;font-weight:600;color:#005c54;\"\u003eWhat is the main advantage of a horizontal cylinder over an upright?\u003c\/summary\u003e\n      \u003cp style=\"margin:10px 0 0 0;font-size:0.93em;\"\u003eA horizontal cylinder is specified when \u003cstrong\u003evertical headroom is insufficient for an upright model\u003c\/strong\u003e. Loft conversions, cupboards beneath sloping rooflines, and plant rooms with low ceilings are the most common applications. The cylinder lays on its side in mounting cradles, requiring only enough headroom to accommodate its diameter plus the 105mm cradle depth. \u003cstrong\u003ePerformance is equivalent to an upright indirect cylinder of the same capacity.\u003c\/strong\u003e\u003c\/p\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails style=\"border-bottom:1px solid #c8e6e3;padding:12px 0;\"\u003e\n      \u003csummary style=\"cursor:pointer;font-weight:600;color:#005c54;\"\u003eDo the mounting cradles add to the installed height?\u003c\/summary\u003e\n      \u003cp style=\"margin:10px 0 0 0;font-size:0.93em;\"\u003eYes. \u003cstrong\u003eThe supplied cradles add 105mm to the installed height\u003c\/strong\u003e — which for a horizontal cylinder is its diameter. A 545mm diameter cylinder therefore requires approximately 650mm of vertical clearance; the 690mm diameter models (400L and 500L) require approximately 795mm. Always measure carefully before ordering.\u003c\/p\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails style=\"border-bottom:1px solid #c8e6e3;padding:12px 0;\"\u003e\n      \u003csummary style=\"cursor:pointer;font-weight:600;color:#005c54;\"\u003eWhat size cylinder do I need?\u003c\/summary\u003e\n      \u003cp style=\"margin:10px 0 0 0;font-size:0.93em;\"\u003eA common rule of thumb is to allow \u003cstrong\u003e45–50 litres of stored hot water per person\u003c\/strong\u003e. A two-person property typically suits 120L; a family of four, 200–250L; larger households or properties with multiple bathrooms should consider 300L or above. For commercial or HMO applications, our team can assist with a detailed sizing calculation.\u003c\/p\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails style=\"border-bottom:1px solid #c8e6e3;padding:12px 0;\"\u003e\n      \u003csummary style=\"cursor:pointer;font-weight:600;color:#005c54;\"\u003eWhy is duplex stainless steel better than standard stainless?\u003c\/summary\u003e\n      \u003cp style=\"margin:10px 0 0 0;font-size:0.93em;\"\u003eDuplex stainless steel has a \u003cstrong\u003emixed austenitic-ferritic microstructure that gives it approximately twice the tensile strength and significantly better resistance to chloride corrosion\u003c\/strong\u003e compared with standard 316L austenitic stainless. This makes it particularly well suited to UK hard-water areas and coastal environments, and is a key reason Ultraflow can offer a 25-year cylinder warranty.\u003c\/p\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails style=\"border-bottom:1px solid #c8e6e3;padding:12px 0;\"\u003e\n      \u003csummary style=\"cursor:pointer;font-weight:600;color:#005c54;\"\u003eIs everything I need for a G3 installation included?\u003c\/summary\u003e\n      \u003cp style=\"margin:10px 0 0 0;font-size:0.93em;\"\u003e\u003cstrong\u003eYes — the complete unvented kit is supplied with every cylinder.\u003c\/strong\u003e This includes the inlet control set, pressure reducing valve, expansion vessel, tundish, temperature and pressure relief valve, and associated fittings required to comply with Part G of the Building Regulations. The installer does not need to source these components separately.\u003c\/p\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails style=\"border-bottom:1px solid #c8e6e3;padding:12px 0;\"\u003e\n      \u003csummary style=\"cursor:pointer;font-weight:600;color:#005c54;\"\u003eCan I upgrade the immersion heater?\u003c\/summary\u003e\n      \u003cp style=\"margin:10px 0 0 0;font-size:0.93em;\"\u003eYes. \u003cstrong\u003eUpgrades are available on request\u003c\/strong\u003e, including 6kW Incoloy, 3kW Titanium, and 6kW Titanium elements. Titanium immersion heaters offer extended service life in particularly aggressive water conditions. Additional immersion heater ports can also be specified for certain configurations.\u003c\/p\u003e\n    \u003c\/details\u003e\n\n    \u003cdetails style=\"padding:12px 0;\"\u003e\n      \u003csummary style=\"cursor:pointer;font-weight:600;color:#005c54;\"\u003eAre the dimensions guaranteed?\u003c\/summary\u003e\n      \u003cp style=\"margin:10px 0 0 0;font-size:0.93em;\"\u003eUltraflow state that all dimensions are \u003cstrong\u003eto be used as guidelines only\u003c\/strong\u003e. Minor variation can occur between production batches. \u003cstrong\u003eAlways confirm final dimensions with Ultraflow before committing to a particularly tight installation\u003c\/strong\u003e, especially where clearances are critical.\u003c\/p\u003e\n    \u003c\/details\u003e\n\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Ultraflow","offers":[{"title":"120L","offer_id":64257129513309,"sku":"UIH120","price":770.0,"currency_code":"GBP","in_stock":true},{"title":"150L","offer_id":64257129546077,"sku":"UIH150","price":795.0,"currency_code":"GBP","in_stock":true},{"title":"180L","offer_id":64257129578845,"sku":"UIH180","price":830.0,"currency_code":"GBP","in_stock":true},{"title":"200L","offer_id":64257129611613,"sku":"UIH200","price":870.0,"currency_code":"GBP","in_stock":true},{"title":"250L","offer_id":64257129644381,"sku":"UIH250","price":990.0,"currency_code":"GBP","in_stock":true},{"title":"300L","offer_id":64257129677149,"sku":"UIH300","price":1050.0,"currency_code":"GBP","in_stock":true},{"title":"400L","offer_id":64257129709917,"sku":"UIH400","price":1900.0,"currency_code":"GBP","in_stock":true},{"title":"500L","offer_id":64257129742685,"sku":"UIH500","price":2100.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/UltraflowHorizontalIndirectUnventedHotWaterCylinder120L_500L.webp?v=1776667340","url":"https:\/\/qualityheating.co.uk\/products\/ultraflow-horizontal-indirect-unvented-hot-water-cylinder-120l-500l","provider":"AIZO Quality Heating","version":"1.0","type":"link"}