{"product_id":"vaillant-unistor-pure-pre-plumbed-heat-pump-cylinder-150l-300l","title":"Vaillant uniSTOR PURE Pre-Plumbed Heat Pump Cylinder 150L–300L","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 Pre-Plumbed Heat Pump Cylinder\u003c\/strong\u003e is a \u003cstrong\u003ehigh-recovery, stainless steel unvented hot water cylinder\u003c\/strong\u003e engineered to work in harmony with Vaillant air-source and ground-source heat pumps. Available in \u003cstrong\u003e150, 175, 210, 250 and 300 litres\u003c\/strong\u003e, every uniSTOR PURE Pre-Plumbed model arrives with \u003cstrong\u003efactory-installed pipework\u003c\/strong\u003e, a tundish, a three-way motorised valve and an unvented cylinder kit already fitted — dramatically reducing on-site labour time and removing the risk of incorrect assembly. The \u003cstrong\u003eexternal expansion vessel\u003c\/strong\u003e is supplied and connects to the clearly labelled, front-facing connection panel, giving installers maximum flexibility when positioning the vessel to suit the plant room layout.\u003c\/p\u003e\n  \u003cp\u003eBuilt around Vaillant's \u003cstrong\u003elarge-diameter smooth-bore coil technology\u003c\/strong\u003e, the uniSTOR PURE delivers \u003cstrong\u003ecoil ratings from 21.7 kW (150 L) up to 52.5 kW (300 L)\u003c\/strong\u003e, maximising heat transfer from the connected heat pump for faster re-heat and consistently high hot-water performance. \u003cstrong\u003eThermal-injected polyurethane insulation combined with vacuum panels\u003c\/strong\u003e keeps standby losses as low as 1.8 kWh\/24 h, whilst the \u003cstrong\u003e100% recyclable stainless steel tank\u003c\/strong\u003e carries a \u003cstrong\u003e25-year anti-corrosion guarantee\u003c\/strong\u003e backed by 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;\"\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    \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;\"\u003e85°C\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eMax DHW Operating Temp\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    Installation, commissioning and servicing must be carried out by a \u003cstrong\u003eG3-qualified competent person\u003c\/strong\u003e in accordance with Building Regulations (England \u0026amp; Wales) and the Benchmark Commissioning Checklist. All installations must be notified to Local Area Building Control or via a Competent Persons Scheme. Annual inspection is recommended to maintain safety, efficiency 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 uniSTOR PURE Pre-Plumbed range 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 feature an increased coil size\u003c\/strong\u003e for compatibility with a wider range of ground-source heat pump systems. Always verify cylinder sizing against the connected heat pump output using the Vaillant compatibility matrix before specification. This cylinder must be installed in a \u003cstrong\u003edry, permanently frost-free room\u003c\/strong\u003e and must never be transported horizontally.\n  \u003c\/div\u003e\n\n  \u003c!-- CALLOUT: TEAL - PRE-PLUMBED INFO --\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 What \"Pre-Plumbed\" Means\u003c\/strong\u003e\u003cbr\u003e\n    The uniSTOR PURE Pre-Plumbed model ships with the \u003cstrong\u003etundish, three-way motorised valve and unvented cylinder kit factory-fitted\u003c\/strong\u003e. The \u003cstrong\u003eexpansion vessel is supplied separately\u003c\/strong\u003e and connects to the external port (the PURE version uses an external expansion vessel — see uniSTOR PLUS for the internal \"bubble top\" alternative). Labelled, \u003cstrong\u003efront-facing connections\u003c\/strong\u003e and a mounting plate for controls simplify installation in tight plant rooms and reduce commissioning time.\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;\"\u003ePre-Plumbed Factory Assembly\u003c\/div\u003e\n      \u003cp style=\"margin:0;\"\u003eThe \u003cstrong\u003etundish, three-way motorised valve and unvented cylinder kit are pre-installed at the factory\u003c\/strong\u003e, saving significant on-site time. Front-facing, clearly labelled connections and a dedicated controls mounting plate ensure a neat, professional installation even in restricted plant rooms.\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 maximises heat exchange surface area (up to 2.8 m² on the 300 L model) for \u003cstrong\u003efaster re-heat times and quieter operation\u003c\/strong\u003e. The smooth bore design inhibits limescale build-up and promotes automatic de-scaling, protecting long-term efficiency without chemical treatment.\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;\"\u003eThermal-Injected PU + Vacuum Insulation\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 1.8 kWh\/24 h — among the lowest in class. This superior insulation keeps stored water hot throughout the day, reducing the frequency of 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;\"\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 (12–25 L depending on model). This configuration allows the installer to position the vessel above or below the cylinder to best suit the available space, offering greater flexibility during system design.\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 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) provides emergency backup hot water if the primary heat source is temporarily unavailable. The immersion is accessible via a ¾\" BSP boss and includes an adjustable thermostat, meeting G3 unvented 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;\"\u003e100% Recyclable Stainless Steel Tank\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 and carries Vaillant's \u003cstrong\u003e25-year anti-corrosion guarantee\u003c\/strong\u003e. A 2-year parts and labour warranty covers all other components, making this one of the most comprehensively guaranteed cylinders available.\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;\"\u003euniSTOR PURE cylinders carry a \u003cstrong\u003eGlobal Warming Potential (GWP) of less than 5 and zero ozone depletion potential\u003c\/strong\u003e, thanks to the thermal-injected insulation formulation. Combined with the recyclable stainless steel tank, this makes the uniSTOR one of the most environmentally responsible cylinders in its class.\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; Automatic Air Vent\u003c\/div\u003e\n      \u003cp style=\"margin:0;\"\u003e\u003cstrong\u003eAdjustable levelling feet\u003c\/strong\u003e simplify installation on uneven floors, while the \u003cstrong\u003efactory-fitted automatic air vent\u003c\/strong\u003e eliminates the need for a separate manual vent during commissioning. A drain valve is also pre-fitted on the cylinder body, contributing to a clean and complete installation.\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;\"\u003eMCS-Compatible \u0026amp; Benchmark Compliant\u003c\/div\u003e\n      \u003cp style=\"margin:0;\"\u003eVaillant is a \u003cstrong\u003elicensed Benchmark Scheme member\u003c\/strong\u003e and a full member of the \u003cstrong\u003eHot Water Association (HWA)\u003c\/strong\u003e. The uniSTOR PURE is CE and UKCA marked and meets the requirements of \u003cstrong\u003eEN 12897:2016\u003c\/strong\u003e. It is compatible with MCS-certified heat pump installations and suitable for 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 PURE 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;\"\u003e8000011517\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;\"\u003e580\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~1,000\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;\"\u003e8000011518\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;\"\u003e580\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~1,265\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;\"\u003e8000011519\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;\"\u003e580\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~1,535\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;\"\u003e8000011520\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;\"\u003e580\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~1,535\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;\"\u003e8000011521\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;\"\u003e580\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~1,745\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 — Pre-Plumbed PURE 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;\"\u003e~148\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~175\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~210\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~249\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~289\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;\"\u003e~127\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~155\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~173\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~211\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~231\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;\"\u003e1.8\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~1.0–1.2\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\u003eCoil Rating (kW)\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e21.7\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\u003eMax DHW Operating Temp (°C)\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e85\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e85\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e85\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e85\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e85\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eMax Heat Circuit Temp (°C)\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e95\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e95\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e95\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e95\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e95\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 style=\"padding:9px 12px;\"\u003e3.0\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e3.0\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e3.0\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e3.0\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e3.0\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\u003eOuter Diameter with Insulation (mm)\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e580\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e580\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e580\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e580\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e580\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 style=\"padding:9px 12px;\"\u003e¾\" BSP female\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e¾\" BSP female\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e¾\" BSP female\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e¾\" BSP female\u003c\/td\u003e\n        \u003ctd 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\u003eInsulation Thickness (mm)\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e40–50\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e50\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e50\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e50\u003c\/td\u003e\n        \u003ctd 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* Approximate values for 175L based on comparable range data. Full specifications for 150L derived from slimline pre-plumbed variant data. Always consult the current Vaillant technical brochure 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 uniSTOR PURE and uniSTOR PLUS?\u003c\/summary\u003e\n    \u003cp style=\"margin:10px 0 0;\"\u003eThe key difference is the expansion vessel arrangement. The \u003cstrong\u003euniSTOR PURE uses an external expansion vessel\u003c\/strong\u003e that is supplied with the cylinder and connected to the externally accessible port — offering flexibility in vessel positioning. The \u003cstrong\u003euniSTOR PLUS incorporates an internal \"bubble top\" expansion vessel\u003c\/strong\u003e, which creates a neater and more compact installation particularly suited to tight plant rooms or airing cupboards. Both are available in pre-plumbed and standard (non-pre-plumbed) variants and share the same core stainless steel cylinder, coil technology 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 does pre-plumbed mean, and what comes already fitted?\u003c\/summary\u003e\n    \u003cp style=\"margin:10px 0 0;\"\u003ePre-plumbed means the cylinder ships with key components \u003cstrong\u003efactory-installed to save installation time and reduce on-site errors\u003c\/strong\u003e. On the uniSTOR PURE Pre-Plumbed, the following are pre-fitted: the \u003cstrong\u003etundish\u003c\/strong\u003e, \u003cstrong\u003ethree-way motorised valve\u003c\/strong\u003e, \u003cstrong\u003eunvented cylinder kit\u003c\/strong\u003e, and all labelled front-facing pipe connections. The \u003cstrong\u003eexpansion vessel is supplied separately\u003c\/strong\u003e for external connection. A mounting plate for heat pump controls is also included.\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 PURE Pre-Plumbed compatible with?\u003c\/summary\u003e\n    \u003cp style=\"margin:10px 0 0;\"\u003eThe uniSTOR PURE Pre-Plumbed is \u003cstrong\u003edesigned to work with the full Vaillant domestic heat pump range\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 250 L and 300 L models have an enlarged coil specifically to support the higher output of \u003cstrong\u003eground-source heat pump systems\u003c\/strong\u003e. Consult the Vaillant cylinder compatibility matrix to match the correct cylinder capacity to the heat pump output.\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 uniSTOR PURE Pre-Plumbed eligible for the Boiler Upgrade Scheme (BUS) grant?\u003c\/summary\u003e\n    \u003cp style=\"margin:10px 0 0;\"\u003eThe Boiler Upgrade Scheme grant is awarded for the installation of a qualifying heat pump, not the cylinder itself. However, the \u003cstrong\u003euniSTOR PURE Pre-Plumbed is compatible with Vaillant MCS-certified heat pumps\u003c\/strong\u003e used in BUS grant applications. The cylinder must be installed as part of a complete, G3-compliant unvented system by a qualified installer. Always verify BUS eligibility requirements with the Ofgem guidance current at the time of application.\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 uniSTOR PURE Pre-Plumbed 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 maintain the full warranty, the cylinder must be installed by a competent, G3-qualified person, commissioned in accordance with the Benchmark Checklist, and serviced annually. The Benchmark Checklist must be completed and signed at commissioning and 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;\"\u003eWhich capacity uniSTOR PURE Pre-Plumbed should I choose?\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 1 bathroom; \u003cstrong\u003e175–210 L\u003c\/strong\u003e is suitable for 3-bedroom homes with 1–2 bathrooms; \u003cstrong\u003e250 L\u003c\/strong\u003e suits larger 3–4 bedroom properties; and \u003cstrong\u003e300 L\u003c\/strong\u003e is recommended for properties with 4+ bedrooms, multiple bathrooms or higher hot-water demand. Always use the Vaillant compatibility matrix alongside your specific heat pump model to confirm the optimum cylinder size for your project.\u003c\/p\u003e\n  \u003c\/details\u003e\n\n\u003c\/div\u003e","brand":"Vaillant","offers":[{"title":"150L PURE Pre-Plumbed","offer_id":64701087220061,"sku":"8000011517","price":1695.0,"currency_code":"GBP","in_stock":true},{"title":"175L PURE Pre-Plumbed","offer_id":64701087252829,"sku":"8000011518","price":1795.0,"currency_code":"GBP","in_stock":true},{"title":"210L PURE Pre-Plumbed","offer_id":64701087285597,"sku":"8000011519","price":1895.0,"currency_code":"GBP","in_stock":true},{"title":"250L PURE Pre-Plumbed","offer_id":64701087318365,"sku":"8000011520","price":1995.0,"currency_code":"GBP","in_stock":true},{"title":"300L PURE Pre-Plumbed","offer_id":64701087416669,"sku":"8000011521","price":2100.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/Vaillant-uniSTOR-PURE-HP-Pre-Plumbed-150-Litre-Cylinder-8000011517.jpg?v=1778839858","url":"https:\/\/qualityheating.co.uk\/products\/vaillant-unistor-pure-pre-plumbed-heat-pump-cylinder-150l-300l","provider":"AIZO Quality Heating","version":"1.0","type":"link"}