{"product_id":"vaillant-unistor-plus-pre-plumbed-heat-pump-cylinder-150l-300l","title":"Vaillant uniSTOR PLUS 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 PLUS Pre-Plumbed Heat Pump Cylinder\u003c\/strong\u003e is the \u003cstrong\u003einternal-expansion, factory pre-plumbed variant\u003c\/strong\u003e of Vaillant's premium high-recovery cylinder range. Available in \u003cstrong\u003e150, 175, 210, 250 and 300 litres\u003c\/strong\u003e, every uniSTOR PLUS Pre-Plumbed model combines a \u003cstrong\u003efactory-integrated internal \"bubble top\" expansion vessel\u003c\/strong\u003e with a pre-assembled connection panel — the \u003cstrong\u003etundish, three-way motorised valve and unvented cylinder kit are all factory-fitted\u003c\/strong\u003e — delivering the fastest and neatest possible installation. The internal vessel eliminates the need for a separate external expansion vessel entirely, making this the ideal choice for airing cupboards, utility rooms and compact plant rooms where every centimetre counts.\u003c\/p\u003e\n  \u003cp\u003eBuilt around Vaillant's \u003cstrong\u003elarge-diameter smooth-bore coil technology\u003c\/strong\u003e, the uniSTOR PLUS Pre-Plumbed delivers \u003cstrong\u003ecoil ratings up to 52.5 kW\u003c\/strong\u003e, with all connections front-facing and clearly labelled. \u003cstrong\u003eThermal-injected polyurethane insulation combined with vacuum panels\u003c\/strong\u003e keeps standby losses as low as 1.0 kWh\/24 h, while the \u003cstrong\u003e100% recyclable stainless steel inner 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;\"\u003eInternal\u003c\/div\u003e\n      \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eExpansion Vessel (Bubble Top)\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;\"\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    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. The \u003cstrong\u003einternal expansion vessel pre-charge pressure must be checked and set\u003c\/strong\u003e to system design requirements during commissioning. All installations must be notified to Local Area Building Control or via a Competent Persons Scheme.\n  \u003c\/div\u003e\n\n  \u003c!-- CALLOUT: AMBER - 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, Sizing \u0026amp; Transport\u003c\/strong\u003e\u003cbr\u003e\n    The uniSTOR PLUS Pre-Plumbed is \u003cstrong\u003eoptimised for use with Vaillant heat pumps\u003c\/strong\u003e (aroTHERM plus, aroTHERM split, flexoTHERM). The \u003cstrong\u003e250 L and 300 L models feature an enlarged coil\u003c\/strong\u003e for compatibility with higher-output ground-source systems. Always verify sizing using the Vaillant cylinder compatibility matrix before specification. The cylinder must be installed in a \u003cstrong\u003edry, permanently frost-free room\u003c\/strong\u003e and must always be transported and stored \u003cstrong\u003evertically\u003c\/strong\u003e — laying the cylinder on its side risks damage to the internal expansion vessel.\n  \u003c\/div\u003e\n\n  \u003c!-- CALLOUT: TEAL - PLUS vs PURE --\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 uniSTOR PLUS vs uniSTOR PURE — Key Difference\u003c\/strong\u003e\u003cbr\u003e\n    The \u003cstrong\u003euniSTOR PLUS\u003c\/strong\u003e incorporates an \u003cstrong\u003einternal \"bubble top\" expansion vessel\u003c\/strong\u003e, making the installation more compact with no external vessel or extra pipe connections required. The \u003cstrong\u003euniSTOR PURE\u003c\/strong\u003e uses an external expansion vessel (supplied) connected to an external port, offering flexibility in vessel positioning when plant room space allows. Both are available in pre-plumbed and standard (non-pre-plumbed) configurations. For installations where space is limited, the PLUS Pre-Plumbed delivers the smallest combined installation footprint of any cylinder in the range.\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;\"\u003eInternal Expansion Vessel — Maximum Space Saving\u003c\/div\u003e\n      \u003cp style=\"margin:0;\"\u003eThe defining feature of the PLUS range is the \u003cstrong\u003epatented, factory-integrated internal \"bubble top\" expansion vessel\u003c\/strong\u003e. By housing the vessel within the cylinder body, there is \u003cstrong\u003eno requirement for a separate external expansion vessel\u003c\/strong\u003e or additional pipe connections, producing the neatest possible installation footprint — essential for airing cupboards, utility rooms and confined 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;\"\u003eFactory Pre-Plumbed — Faster On-Site Installation\u003c\/div\u003e\n      \u003cp style=\"margin:0;\"\u003eThe \u003cstrong\u003etundish, three-way motorised valve and unvented cylinder kit are factory-installed\u003c\/strong\u003e before despatch. Front-facing, clearly labelled connections and a dedicated \u003cstrong\u003econtrols mounting plate\u003c\/strong\u003e are included as standard, allowing the installer to complete pipework connections quickly and confidently — saving hours on site and reducing the risk of commissioning errors.\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 exchanger surface area — up to 2.8 m² on the 300 L model — achieving \u003cstrong\u003ecoil ratings up to 52.5 kW\u003c\/strong\u003e for fast re-heat and efficient heat pump operation. The smooth-bore design inhibits limescale accumulation and promotes \u003cstrong\u003eautomatic de-scaling\u003c\/strong\u003e, maintaining efficiency over the full service life without chemical intervention.\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 Panel 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 1.0 kWh\/24 h — among the lowest in class. This superior insulation performance keeps stored water hot throughout the day, reducing unnecessary re-heat cycles and cutting running costs for the homeowner across 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;\"\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) provides emergency backup hot water should the primary heat source be temporarily unavailable. The adjustable thermostat meets G3 unvented cylinder safety requirements and is set by the installer during commissioning. The element is accessible via the immersion heater boss on the cylinder body.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"flex:1;min-width:260px;background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;font-size:15px;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003e25-Year Guaranteed 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. Vaillant backs this with a \u003cstrong\u003e25-year anti-corrosion guarantee on the tank\u003c\/strong\u003e and a \u003cstrong\u003e2-year parts and labour warranty on all other components\u003c\/strong\u003e, giving installers and homeowners comprehensive long-term protection.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"flex:1;min-width:260px;background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n      \u003cdiv style=\"font-weight:700;font-size:15px;border-bottom:2px solid #008377CF;padding-bottom:6px;margin-bottom:10px;\"\u003eLow GWP \u0026amp; Sustainable Design\u003c\/div\u003e\n      \u003cp style=\"margin:0;\"\u003eA \u003cstrong\u003eGlobal Warming Potential of less than 5 and zero ozone depletion\u003c\/strong\u003e from the thermal-injected insulation, combined with a \u003cstrong\u003e100% recyclable stainless steel tank\u003c\/strong\u003e, makes the uniSTOR PLUS Pre-Plumbed one of the most environmentally responsible hot water cylinders available in the UK 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 \u0026amp; Automatic Air Vent\u003c\/div\u003e\n      \u003cp style=\"margin:0;\"\u003e\u003cstrong\u003eAdjustable levelling feet\u003c\/strong\u003e simplify installation on uneven surfaces, while the \u003cstrong\u003efactory-fitted automatic air vent\u003c\/strong\u003e eliminates trapped air during commissioning without manual intervention. A \u003cstrong\u003epre-fitted drain valve\u003c\/strong\u003e is also included on the cylinder body, simplifying maintenance and annual servicing 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;\"\u003eBenchmark Compliant \u0026amp; HWA Member\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 PLUS Pre-Plumbed carries \u003cstrong\u003eCE and UKCA marking\u003c\/strong\u003e and meets \u003cstrong\u003eEN 12897:2016\u003c\/strong\u003e. It is compatible with \u003cstrong\u003eMCS-certified heat pump installations\u003c\/strong\u003e, supporting BUS grant-funded projects and Building Regulations compliance.\u003c\/p\u003e\n    \u003c\/div\u003e\n\n  \u003c\/div\u003e\n\n  \u003c!-- VARIANT TABLE — MPN --\u003e\n  \u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px 6px 0 0;font-weight:700;font-size:16px;margin-top:28px;\"\u003eVariant Reference — uniSTOR PLUS Pre-Plumbed\u003c\/div\u003e\n  \u003cdiv style=\"overflow-x:auto;\"\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;font-size:14px;\"\u003e\n    \u003cthead\u003e\n      \u003ctr style=\"background:#005c54;color:#fff;text-align:left;\"\u003e\n        \u003cth style=\"padding:10px 12px;\"\u003eCapacity\u003c\/th\u003e\n        \u003cth style=\"padding:10px 12px;\"\u003eVaillant MPN\u003c\/th\u003e\n        \u003cth style=\"padding:10px 12px;\"\u003eModel Code\u003c\/th\u003e\n        \u003cth style=\"padding:10px 12px;\"\u003eEnergy Class\u003c\/th\u003e\n        \u003cth style=\"padding:10px 12px;\"\u003eDiameter (mm)\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003e150 L\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003e8000012320\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eVIH RW 150\/5 B PPIAES\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eB\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\u003e175 L\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003e8000012321\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eVIH RW 175\/5 B PPIAES\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eB\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e580\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003e210 L\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003e8000012322\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eVIH RW 210\/5 B PPIAES\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eB\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\u003e250 L\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003e8000012323\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eVIH RW 250\/5 C PPIAES\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eC\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e580\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003e300 L\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003e8000012324\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eVIH RW 300\/5 C PPIAES\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003eC\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e580\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n  \u003c\/div\u003e\n  \u003cp style=\"font-size:13px;color:#555;margin-top:6px;\"\u003eMPN source: Vaillant installation manual 8000014609-07 (July 2025). PPIAES = Pre-Plumbed, Internal (bubble top) expansion vessel, Immersion heater, Stainless steel. Note: MPNs 8000012315–8000012319 are the \u003cem\u003estandard (non-pre-plumbed) PLUS\u003c\/em\u003e cylinders — do not confuse with this pre-plumbed range.\u003c\/p\u003e\n\n  \u003c!-- SPEC TABLE --\u003e\n  \u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px 6px 0 0;font-weight:700;font-size:16px;margin-top:28px;\"\u003eTechnical Specifications — PLUS Pre-Plumbed 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\u003eStandby Losses (kWh\/24h)\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~1.0\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~1.1\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~1.2\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~1.4\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~1.6\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eCoil Rating (kW)\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~20.8\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~24\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~26\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~40.7\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~52.5\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eHeat Exchanger Surface (m²)\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~1.0\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~1.2\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~1.4\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~2.4\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e~2.8\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003ePrimary Flow Rate (L\/h)\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e900\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e900\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e900\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e900\u003c\/td\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e1,300\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eExpansion Vessel Type\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd colspan=\"5\" style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eInternal \"bubble top\" — factory-integrated, no external vessel required\u003c\/strong\u003e\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\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:#fff;\"\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:#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 (13 A, 1.5 mm² cable)\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;\"\u003e580\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n        \u003ctd style=\"padding:9px 12px;\"\u003e\u003cstrong\u003eCold \/ Hot Water Connection\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd colspan=\"5\" style=\"padding:9px 12px;\"\u003e¾\" BSP female\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr style=\"background:#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* Capacities and coil ratings are indicative, based on equivalent PURE pre-plumbed and standard uniSTOR data. Always confirm final specifications with the current Vaillant uniSTOR PLUS technical documentation for your specific model prior to 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 PLUS and uniSTOR PURE Pre-Plumbed?\u003c\/summary\u003e\n    \u003cp style=\"margin:10px 0 0;\"\u003eThe key difference is the expansion vessel arrangement. The \u003cstrong\u003euniSTOR PLUS Pre-Plumbed has a factory-integrated internal \"bubble top\" expansion vessel\u003c\/strong\u003e — no external vessel is needed, producing the most compact installation possible. The \u003cstrong\u003euniSTOR PURE Pre-Plumbed has an external expansion vessel\u003c\/strong\u003e (supplied) that is connected on site, offering more flexibility in vessel positioning but requiring a slightly larger installation footprint. Both are factory pre-plumbed with the tundish, three-way valve and unvented kit, and share the same stainless steel cylinder, coil technology and guarantee.\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 PLUS Pre-Plumbed suitable for tight spaces such as airing cupboards?\u003c\/summary\u003e\n    \u003cp style=\"margin:10px 0 0;\"\u003eYes — this is specifically where the PLUS Pre-Plumbed excels. The \u003cstrong\u003eintegrated internal expansion vessel removes the need for any external vessel in the plant room\u003c\/strong\u003e, minimising the installation footprint. The pre-plumbed connection panel with front-facing ports further simplifies installation in confined spaces. All five capacities share the same \u003cstrong\u003e580 mm outer diameter\u003c\/strong\u003e; confirm the required height against available headroom for your chosen capacity.\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 are compatible with the uniSTOR PLUS Pre-Plumbed?\u003c\/summary\u003e\n    \u003cp style=\"margin:10px 0 0;\"\u003eThe uniSTOR PLUS 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 \u003cstrong\u003e250 L and 300 L models have an enlarged coil\u003c\/strong\u003e to support higher-output ground-source applications. Always consult the Vaillant cylinder compatibility matrix to confirm the correct model for the connected 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;\"\u003eWhat components are factory-fitted on the uniSTOR PLUS Pre-Plumbed?\u003c\/summary\u003e\n    \u003cp style=\"margin:10px 0 0;\"\u003eThe following are factory-installed before despatch: \u003cstrong\u003einternal expansion vessel\u003c\/strong\u003e (\"bubble top\"), \u003cstrong\u003etundish\u003c\/strong\u003e, \u003cstrong\u003ethree-way motorised valve\u003c\/strong\u003e, \u003cstrong\u003eunvented cylinder kit\u003c\/strong\u003e, \u003cstrong\u003eautomatic air vent\u003c\/strong\u003e, \u003cstrong\u003edrain valve\u003c\/strong\u003e and \u003cstrong\u003e3.0 kW immersion heater\u003c\/strong\u003e. All connections are labelled and face forwards. A \u003cstrong\u003econtrols mounting plate\u003c\/strong\u003e is also included. The installer simply connects the heat pump pipework and domestic water supply to the clearly identified, pre-labelled ports.\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 PLUS 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, including the pre-plumbed assembly and internal expansion vessel. Full warranty coverage requires installation by a G3-qualified competent person, commissioning in line with the Benchmark Checklist, and annual inspection by a competent person. The Benchmark Checklist must be completed, signed 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;\"\u003eHow do I select the right capacity uniSTOR PLUS Pre-Plumbed?\u003c\/summary\u003e\n    \u003cp style=\"margin:10px 0 0;\"\u003eAs a general guide: \u003cstrong\u003e150 L\u003c\/strong\u003e suits 1–2 bedroom homes with one bathroom; \u003cstrong\u003e175–210 L\u003c\/strong\u003e suits 3-bedroom homes with 1–2 bathrooms; \u003cstrong\u003e250 L\u003c\/strong\u003e suits larger 3–4 bedroom properties; \u003cstrong\u003e300 L\u003c\/strong\u003e is recommended for 4+ bedroom homes or high hot-water-demand properties. Always cross-reference with the connected heat pump output and number of occupants using the Vaillant cylinder compatibility matrix for your specific project.\u003c\/p\u003e\n  \u003c\/details\u003e\n\n\u003c\/div\u003e","brand":"Vaillant","offers":[{"title":"150L PLUS Pre-Plumbed","offer_id":64701262856541,"sku":"8000012320","price":1895.0,"currency_code":"GBP","in_stock":true},{"title":"175L PLUS Pre-Plumbed","offer_id":64701262889309,"sku":"8000012321","price":1995.0,"currency_code":"GBP","in_stock":true},{"title":"210L PLUS Pre-Plumbed","offer_id":64701262922077,"sku":"8000012322","price":2095.0,"currency_code":"GBP","in_stock":true},{"title":"250L PLUS Pre-Plumbed","offer_id":64701262954845,"sku":"8000012323","price":2195.0,"currency_code":"GBP","in_stock":true},{"title":"300L PLUS Pre-Plumbed","offer_id":64701262987613,"sku":"8000012324","price":2395.0,"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_a3d316e7-e136-438a-a7c2-c1a225f2a8ea.jpg?v=1778842441","url":"https:\/\/qualityheating.co.uk\/products\/vaillant-unistor-plus-pre-plumbed-heat-pump-cylinder-150l-300l","provider":"AIZO Quality Heating","version":"1.0","type":"link"}