{"product_id":"vaillant-unistor-pure-heat-pump-cylinder-150l-300l-standard","title":"Vaillant uniSTOR PURE 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 PURE Heat Pump Cylinder\u003c\/strong\u003e (standard, non-pre-plumbed) is a \u003cstrong\u003ehigh-recovery, stainless steel unvented hot water cylinder\u003c\/strong\u003e that gives installers the freedom to connect and configure pipework to their own design. Available in \u003cstrong\u003e150, 175, 210, 250 and 300 litres\u003c\/strong\u003e, every standard uniSTOR PURE arrives complete with a tundish, three-way motorised valve, unvented cylinder kit, expansion vessel and a ¾\" × 28mm MI-copper compression fitting. The \u003cstrong\u003e250 L and 300 L models also include a secondary return T-piece connection\u003c\/strong\u003e for properties with a secondary circulation loop.\u003c\/p\u003e\n  \u003cp\u003eBuilt around the same \u003cstrong\u003elarge-diameter smooth-bore coil technology\u003c\/strong\u003e as the pre-plumbed range, the standard uniSTOR PURE achieves 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, ensuring rapid re-heat and consistently high hot-water output when connected to a Vaillant air-source or ground-source heat pump. The \u003cstrong\u003e100% recyclable stainless steel inner tank\u003c\/strong\u003e carries a \u003cstrong\u003e25-year anti-corrosion guarantee\u003c\/strong\u003e, and the \u003cstrong\u003eexternal expansion vessel\u003c\/strong\u003e (supplied) is connected during on-site installation to best suit the available space.\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;\"\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    \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;\"\u003eB\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eEnergy Efficiency Class (A+–F)\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- CALLOUT: RED - INSTALLER REQUIREMENT --\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 be carried out exclusively by a \u003cstrong\u003eG3-qualified competent person\u003c\/strong\u003e, in full compliance with Building Regulations (England \u0026amp; Wales) Part G and the Benchmark Commissioning Checklist. All installations must be notified to Local Area Building Control or via a Competent Persons Scheme. Annual inspection is required to maintain safety and warranty validity.\n  \u003c\/div\u003e\n\n  \u003c!-- CALLOUT: AMBER - COMPATIBILITY NOTE --\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; Sizing Note\u003c\/strong\u003e\u003cbr\u003e\n    The standard uniSTOR PURE is \u003cstrong\u003eoptimised for use with Vaillant heat pumps\u003c\/strong\u003e. The \u003cstrong\u003e250 L and 300 L models include a secondary return T-piece connection\u003c\/strong\u003e and have an enlarged coil for compatibility with ground-source systems with higher output. The cylinder must be installed in a \u003cstrong\u003edry, permanently frost-free location\u003c\/strong\u003e and must always be transported and stored \u003cstrong\u003evertically\u003c\/strong\u003e — never on its side.\n  \u003c\/div\u003e\n\n  \u003c!-- CALLOUT: TEAL - STANDARD vs PRE-PLUMBED --\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 Standard vs Pre-Plumbed\u003c\/strong\u003e\u003cbr\u003e\n    The standard (non-pre-plumbed) uniSTOR PURE is supplied with the \u003cstrong\u003etundish, three-way motorised valve, unvented cylinder kit, expansion vessel and compression fitting included\u003c\/strong\u003e but \u003cstrong\u003enot factory-assembled\u003c\/strong\u003e. The installer connects and routes pipework during installation to suit the specific plant room layout. This approach is preferred where \u003cstrong\u003ebespoke pipework routing\u003c\/strong\u003e is needed or where the pre-plumbed configuration does not suit the site layout. For a factory-fitted, faster-install option, see the \u003cstrong\u003euniSTOR PURE 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;\"\u003eComplete System Kit Supplied\u003c\/div\u003e\n      \u003cp style=\"margin:0;\"\u003eThe standard uniSTOR PURE is supplied with a \u003cstrong\u003etundish, three-way motorised valve, unvented cylinder kit, expansion vessel and ¾\" × 28mm MI-copper compression fitting\u003c\/strong\u003e as standard. The 250 L and 300 L models additionally include a \u003cstrong\u003esecondary return T-piece connection\u003c\/strong\u003e, supporting properties with a secondary circulation loop for instant hot water at all outlets.\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 design\u003c\/strong\u003e maximises heat exchanger surface area (1.0 m² on 150 L, up to 2.8 m² on 300 L) for \u003cstrong\u003efast re-heat and efficient heat transfer\u003c\/strong\u003e from the connected heat pump. The smooth bore inhibits limescale formation and promotes \u003cstrong\u003eautomatic self-de-scaling\u003c\/strong\u003e, maintaining coil efficiency over the cylinder's full service life.\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 Standby Losses from 1.0 kWh\/24 h\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. This means stored hot water stays at temperature throughout the day, reducing unnecessary re-heat cycles and lowering the homeowner's energy bills.\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;\"\u003eExternal Expansion Vessel (PURE)\u003c\/div\u003e\n      \u003cp style=\"margin:0;\"\u003eThe PURE variant uses an \u003cstrong\u003eexternal expansion vessel supplied with the cylinder\u003c\/strong\u003e. The installer connects and positions the vessel during installation to suit the site layout, with flexibility over whether it is mounted above or below the cylinder. Supplied expansion vessel sizes range from \u003cstrong\u003e12 L (150 L cylinder) to 25 L (250–300 L cylinders)\u003c\/strong\u003e.\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-fitted immersion heater\u003c\/strong\u003e (13 A, 1.5 mm² cable, 1¼\" BSP boss) provides emergency backup heating in case the primary heat source is unavailable. The immersion thermostat is adjustable 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;\"\u003eRecyclable Stainless Steel — 25-Year Guarantee\u003c\/div\u003e\n      \u003cp style=\"margin:0;\"\u003eThe inner cylinder is manufactured from \u003cstrong\u003ehigh-grade 100% recyclable stainless steel\u003c\/strong\u003e with an ultra-hard-wearing outer shell. Vaillant backs this with a \u003cstrong\u003e25-year anti-corrosion guarantee\u003c\/strong\u003e on the tank and a \u003cstrong\u003e2-year parts and labour warranty\u003c\/strong\u003e on all other components, providing one of the most comprehensive guarantees available in the 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;\"\u003eAdjustable Feet for Flexible Siting\u003c\/div\u003e\n      \u003cp style=\"margin:0;\"\u003e\u003cstrong\u003eAdjustable levelling feet\u003c\/strong\u003e ensure the cylinder can be set plumb on uneven or sloped floors, avoiding stress on pipework connections. A pre-fitted \u003cstrong\u003edrain valve\u003c\/strong\u003e on the cylinder body facilitates safe draining during servicing or when the property is left unoccupied in freezing conditions.\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 Environmental Impact\u003c\/div\u003e\n      \u003cp style=\"margin:0;\"\u003eA \u003cstrong\u003eGWP of less than 5 and zero ozone depletion\u003c\/strong\u003e from the thermal-injected insulation formulation, combined with a recyclable stainless steel body, makes the uniSTOR PURE one of the most environmentally conscious cylinders in the UK market. Suitable for specifiers targeting low-carbon heat pump system designs.\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 PURE 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. It is suitable for \u003cstrong\u003eMCS-certified heat pump installations\u003c\/strong\u003e and BUS 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 PURE 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 Article No. (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;\"\u003eDiameter (mm)\u003c\/th\u003e\n        \u003cth style=\"padding:10px 12px;\"\u003eHeight (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;\"\u003e8000011512\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eVIH RW 150\/5 B ES\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eB\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e595\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e1,000\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;\"\u003e8000011513\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eVIH RW 175\/5 B ES\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eB\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e595\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~1,100\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;\"\u003e8000011514\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eVIH RW 210\/5 C ES\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eC\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e595\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e1,265\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;\"\u003e8000011515\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eVIH RW 250\/5 C ES\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eC\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e595\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e1,535\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;\"\u003e8000011516\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eVIH RW 300\/5 C ES\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eC\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e595\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e1,745\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\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;font-weight:700;font-size:16px;margin-top:28px;\"\u003eTechnical Specifications — Standard PURE Range (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;\"\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\u003eActual Capacity (no coil) (L)\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e143.8\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~168\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e190.7\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e236.3\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e273.5\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\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:#fff;\"\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:#f0faf9;\"\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:#fff;\"\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:#f0faf9;\"\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:#fff;\"\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:#f0faf9;\"\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:#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\u003eExpansion Vessel (L, supplied)\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e12\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e12–18\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e18\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e25\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e25\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\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:#fff;\"\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:#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;\"\u003e38.0\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~42\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e46.0\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e61.0\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e67.6\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\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:#f0faf9;\"\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 specifications are approximate, interpolated from the 150 L and 210 L verified data. Always confirm specifications with the current Vaillant 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 difference between the standard uniSTOR PURE and the pre-plumbed version?\u003c\/summary\u003e\n    \u003cp style=\"margin:10px 0 0;\"\u003eThe \u003cstrong\u003estandard uniSTOR PURE\u003c\/strong\u003e is supplied with the tundish, three-way motorised valve, unvented cylinder kit and expansion vessel as loose components for the installer to connect and route on site. The \u003cstrong\u003epre-plumbed version\u003c\/strong\u003e has these components factory-fitted, with a pre-assembled connection panel that reduces installation time and the risk of errors. The standard model is preferred where bespoke pipework routing is required or where the pre-plumbed configuration does not suit the installation layout.\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;\"\u003eIs the standard uniSTOR PURE compatible with Vaillant heat pumps?\u003c\/summary\u003e\n    \u003cp style=\"margin:10px 0 0;\"\u003eYes. The standard uniSTOR PURE is \u003cstrong\u003especifically engineered to work with Vaillant heat pumps\u003c\/strong\u003e, including the aroTHERM plus, aroTHERM split and flexoTHERM ranges. The 250 L and 300 L models feature an \u003cstrong\u003eenlarged coil for ground-source heat pump compatibility\u003c\/strong\u003e. Consult the Vaillant cylinder compatibility matrix to match the cylinder capacity to the heat pump output for optimum system performance.\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 is included in the box with the standard uniSTOR PURE?\u003c\/summary\u003e\n    \u003cp style=\"margin:10px 0 0;\"\u003eThe standard uniSTOR PURE is supplied with: a \u003cstrong\u003etundish\u003c\/strong\u003e, a \u003cstrong\u003e28mm three-way motorised valve\u003c\/strong\u003e, a \u003cstrong\u003eG3 unvented cylinder kit\u003c\/strong\u003e, an \u003cstrong\u003eexpansion vessel\u003c\/strong\u003e (sized to the cylinder capacity), and a \u003cstrong\u003e¾\" × 28mm MI-copper compression fitting\u003c\/strong\u003e. The 250 L and 300 L models also include a \u003cstrong\u003esecondary return T-piece connection\u003c\/strong\u003e. The cylinder's factory-fitted components include the immersion heater, T\u0026amp;P relief valve and drain valve.\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 guarantee does the standard uniSTOR PURE 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. To retain full warranty coverage, the cylinder must be installed by a G3-qualified competent person, commissioned in accordance with the Benchmark Checklist, and inspected annually by a competent person.\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;\"\u003eCan the standard uniSTOR PURE be used with a secondary circulation loop?\u003c\/summary\u003e\n    \u003cp style=\"margin:10px 0 0;\"\u003eYes. The \u003cstrong\u003e250 L and 300 L models include a dedicated secondary return T-piece connection\u003c\/strong\u003e, making them suited to properties with a secondary circulation (seconday return) system for instant hot water at multiple outlets. The 150 L, 175 L and 210 L models do not include this connection as standard — an appropriate tee piece would need to be added during installation if required.\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;\"\u003eWhich capacity uniSTOR PURE should I choose for my property?\u003c\/summary\u003e\n    \u003cp style=\"margin:10px 0 0;\"\u003eAs a general guide: \u003cstrong\u003e150 L\u003c\/strong\u003e is appropriate for 1–2 bedroom homes with one bathroom; \u003cstrong\u003e175–210 L\u003c\/strong\u003e suits 3-bedroom properties; \u003cstrong\u003e250 L\u003c\/strong\u003e is recommended for larger 3–4 bedroom homes; and \u003cstrong\u003e300 L\u003c\/strong\u003e suits 4+ bedroom properties or those with higher daily hot-water usage. Always cross-reference with the heat pump output, the number of occupants and the number of bathrooms, using the Vaillant compatibility matrix.\u003c\/p\u003e\n  \u003c\/details\u003e\n\n\u003c\/div\u003e","brand":"Vaillant","offers":[{"title":"150L PURE","offer_id":64701593583965,"sku":"8000011512","price":1370.0,"currency_code":"GBP","in_stock":true},{"title":"175L PURE","offer_id":64701593616733,"sku":"8000011513","price":1450.0,"currency_code":"GBP","in_stock":true},{"title":"210L PURE","offer_id":64701593649501,"sku":"8000011514","price":1495.0,"currency_code":"GBP","in_stock":true},{"title":"250L PURE","offer_id":64701593682269,"sku":"8000011515","price":1695.0,"currency_code":"GBP","in_stock":true},{"title":"300L PURE","offer_id":64701593715037,"sku":"8000011516","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-pure-heat-pump-cylinder-150l-300l-standard","provider":"AIZO Quality Heating","version":"1.0","type":"link"}