{"product_id":"harlequin-heatstream-150-indirect-electric-plus-thermal-store","title":"Harlequin HeatStream 150 Indirect Electric PLUS Thermal Store","description":"\u003cdiv style=\"font-family:Arial,sans-serif;font-size:16px;color:#1a1a1a;max-width:900px;margin:0 auto;line-height:1.6;\"\u003e\n\n\u003cp style=\"font-size:17px;margin-bottom:20px;\"\u003e\nThe \u003cstrong\u003eHarlequin HeatStream 150 Indirect\u003c\/strong\u003e — sold as the \u003cstrong\u003eHeatStream 150 Electric PLUS\u003c\/strong\u003e (model \u003cstrong\u003eHS150EPLUS\u003c\/strong\u003e) — is a \u003cstrong\u003e150-litre open-vented thermal store\u003c\/strong\u003e engineered for properties where \u003cstrong\u003eboth electricity and a traditional primary heat source\u003c\/strong\u003e (such as a gas, oil or LPG boiler, or district heating) are available. It builds on the award-winning HeatStream Electric platform by adding a \u003cstrong\u003estainless steel primary coil rated to 14 bar\u003c\/strong\u003e, enabling pre-heating of the store from a central heating circuit in as little as \u003cstrong\u003e10 minutes\u003c\/strong\u003e. Like all HeatStream models, it is \u003cstrong\u003enot subject to Part G of the Building Regulations\u003c\/strong\u003e, requires \u003cstrong\u003eno G3 qualification\u003c\/strong\u003e and delivers \u003cstrong\u003emains-pressurised hot water\u003c\/strong\u003e with minimal maintenance — making it the definitive upgrade for flats, apartments and houses moving towards a hybrid or multi-source heating strategy.\n\u003c\/p\u003e\n\n\u003c!-- Stat strip --\u003e\n\u003cdiv style=\"display:flex;flex-wrap:wrap;gap:12px;margin-bottom:28px;\"\u003e\n  \u003cdiv style=\"flex:1;min-width:130px;background:#008377CF;color:#fff;border-radius:8px;padding:16px 12px;text-align:center;\"\u003e\n    \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e150 L\u003c\/div\u003e\n    \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eStorage Capacity\u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"flex:1;min-width:130px;background:#008377CF;color:#fff;border-radius:8px;padding:16px 12px;text-align:center;\"\u003e\n    \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003eErP B\u003c\/div\u003e\n    \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eEnergy Rating\u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"flex:1;min-width:130px;background:#008377CF;color:#fff;border-radius:8px;padding:16px 12px;text-align:center;\"\u003e\n    \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e14 bar\u003c\/div\u003e\n    \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003ePrimary Coil Rating\u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"flex:1;min-width:130px;background:#008377CF;color:#fff;border-radius:8px;padding:16px 12px;text-align:center;\"\u003e\n    \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e10 min\u003c\/div\u003e\n    \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003ePre-Heat via Boiler\u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv style=\"flex:1;min-width:130px;background:#008377CF;color:#fff;border-radius:8px;padding:16px 12px;text-align:center;\"\u003e\n    \u003cdiv style=\"font-size:26px;font-weight:700;\"\u003e1.12 kWh\u003c\/div\u003e\n    \u003cdiv style=\"font-size:13px;margin-top:4px;\"\u003eStanding Heat Loss\/Day\u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c!-- Teal info callout --\u003e\n\u003cdiv style=\"background:#e6f4f3;border-left:4px solid #008377CF;padding:14px 18px;border-radius:6px;margin-bottom:24px;\"\u003e\n  \u003cstrong style=\"color:#005c54;\"\u003eWhat Makes the PLUS Different?\u003c\/strong\u003e The HeatStream Electric PLUS adds a \u003cstrong\u003efactory-fitted primary heat source coil\u003c\/strong\u003e to the standard Electric model. This coil connects to any external heat source — gas boiler, oil boiler, LPG, district heating or heat pump — and rapidly pre-heats the store. The immersion heaters remain available as backup or boost heating, giving total flexibility across changing energy strategies.\n\u003c\/div\u003e\n\n\u003c!-- Section heading --\u003e\n\u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px;margin-bottom:18px;\"\u003e\n  \u003cstrong style=\"font-size:16px;\"\u003eKey Features\u003c\/strong\u003e\n\u003c\/div\u003e\n\n\u003cdiv style=\"display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;margin-bottom:28px;\"\u003e\n\n  \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n    \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:8px;\"\u003e🔵 No Part G \/ No G3 Qualification\u003c\/div\u003e\n    \u003cp style=\"margin:0;font-size:15px;\"\u003eOpen-vented design means the HS150EPLUS is \u003cstrong\u003eexempt from Part G of the Building Regulations\u003c\/strong\u003e and requires no G3-qualified engineer, no expansion vessel and no T\u0026amp;P relief valve — significantly reducing installation complexity and cost.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n    \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:8px;\"\u003e🔥 Dual Heat Source — Primary Coil + Immersion\u003c\/div\u003e\n    \u003cp style=\"margin:0;font-size:15px;\"\u003eThe \u003cstrong\u003eprimary stainless steel coil\u003c\/strong\u003e connects to a gas, oil, LPG or district heating circuit and pre-heats the full 150-litre store in as little as \u003cstrong\u003e20 minutes\u003c\/strong\u003e. The \u003cstrong\u003e3 kW + 3 kW immersion heater\u003c\/strong\u003e provides independent backup and boost heating.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n    \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:8px;\"\u003e🏗️ 14-Bar Primary Coil — District Heating Ready\u003c\/div\u003e\n    \u003cp style=\"margin:0;font-size:15px;\"\u003eThe \u003cstrong\u003eprimary coil is rated to 14 bar\u003c\/strong\u003e, making it fully compatible with high-pressure district heating networks in addition to conventional domestic boiler circuits. Pressure drop at 15 l\/min is just 107 mbar.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n    \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:8px;\"\u003e☀️ Solar PV \u0026amp; Off-Peak Tariff Compatible\u003c\/div\u003e\n    \u003cp style=\"margin:0;font-size:15px;\"\u003eUse cheap overnight electricity or solar PV surplus via the immersion heaters, and top up with the boiler during peak demand. The \u003cstrong\u003e150-litre thermal mass buffers energy efficiently\u003c\/strong\u003e regardless of which source provides the heat.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n    \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:8px;\"\u003e📐 Compact 520 × 520 mm Square Footprint\u003c\/div\u003e\n    \u003cp style=\"margin:0;font-size:15px;\"\u003e\u003cstrong\u003e1,315 mm tall with a 520 × 520 mm base\u003c\/strong\u003e — the PLUS model is only marginally heavier than the standard Electric at 39 kg empty (191 kg filled), and fits through a standard doorway or into a small airing cupboard without difficulty.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n    \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:8px;\"\u003e🛡️ Durable Non-Corrosive Construction\u003c\/div\u003e\n    \u003cp style=\"margin:0;font-size:15px;\"\u003e\u003cstrong\u003ePolyethylene outer shell\u003c\/strong\u003e, \u003cstrong\u003epolypropylene inner tank\u003c\/strong\u003e and \u003cstrong\u003estainless steel corrugated coils\u003c\/strong\u003e combine to deliver a corrosion-resistant, long-life product suitable for all UK water quality conditions including hard water and chloride-rich supplies.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n    \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:8px;\"\u003e🔧 Simple Installation — All Connections on Top\u003c\/div\u003e\n    \u003cp style=\"margin:0;font-size:15px;\"\u003e\u003cstrong\u003eAll domestic hot water and primary circuit connections are on top\u003c\/strong\u003e of the unit. The primary coil connects via 22 mm compression fittings. The integrated heat source coil thermostat (pre-set 65°C, adjustable 45–75°C) controls primary circuit flow automatically.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:8px;padding:18px;\"\u003e\n    \u003cdiv style=\"font-weight:700;color:#005c54;margin-bottom:8px;\"\u003e🦠 Reduced Legionella Risk\u003c\/div\u003e\n    \u003cp style=\"margin:0;font-size:15px;\"\u003eA \u003cstrong\u003ethermostatic mixing valve\u003c\/strong\u003e is supplied and pre-set to 45°C. Both heat sources can drive the store well above pasteurisation temperature, significantly \u003cstrong\u003ereducing the risk of Legionella proliferation\u003c\/strong\u003e. No annual safety inspection is required.\u003c\/p\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n\n\u003c!-- Spec table --\u003e\n\u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px;margin-bottom:18px;\"\u003e\n  \u003cstrong style=\"font-size:16px;\"\u003eTechnical Specifications\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;margin-bottom:28px;font-size:15px;\"\u003e\n  \u003ctbody\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;font-weight:600;width:50%;\"\u003eModel Code\u003c\/td\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;\"\u003eHS150EPLUS\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;font-weight:600;\"\u003eStorage Volume\u003c\/td\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;\"\u003e152 litres (nominal)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;font-weight:600;\"\u003eDimensions (L × W × H)\u003c\/td\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;\"\u003e520 × 520 × 1,315 mm\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;font-weight:600;\"\u003eEmpty Weight\u003c\/td\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;\"\u003e39 kg\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;font-weight:600;\"\u003eFilled Weight\u003c\/td\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;\"\u003e191 kg\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;font-weight:600;\"\u003eErP Energy Rating\u003c\/td\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;\"\u003eB\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;font-weight:600;\"\u003eStanding Heat Loss\u003c\/td\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;\"\u003e1.12 kWh\/24h\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;font-weight:600;\"\u003eImmersion Heaters\u003c\/td\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;\"\u003eDual element: 3 kW (short\/boost) + 3 kW (long)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;font-weight:600;\"\u003eHeat-Up via Primary Coil (15–60°C at 15 l\/min)\u003c\/td\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;\"\u003e20 minutes\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;font-weight:600;\"\u003eFull Heat-Up via Long Immersion (15–60°C)\u003c\/td\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;\"\u003e156 minutes\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;font-weight:600;\"\u003eFull Heat-Up via Both Immersions (15–60°C)\u003c\/td\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;\"\u003e78 minutes\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;font-weight:600;\"\u003eBoost Reheat (45–60°C, short element)\u003c\/td\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;\"\u003e20 minutes (50 litres)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;font-weight:600;\"\u003eHot Water at 15 l\/min (60°C store)\u003c\/td\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;\"\u003e113 litres (no reheat)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;font-weight:600;\"\u003eHot Water at 15 l\/min (70°C store)\u003c\/td\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;\"\u003e180 litres\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;font-weight:600;\"\u003eDHW Coil Max Operating Pressure\u003c\/td\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;\"\u003e3 bar\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;font-weight:600;\"\u003ePrimary Coil Max Operating Pressure\u003c\/td\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;\"\u003e14 bar\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;font-weight:600;\"\u003ePrimary Coil Pressure Drop at 15 l\/min\u003c\/td\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;\"\u003e107 mbar\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;font-weight:600;\"\u003ePrimary Coil Connections\u003c\/td\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;\"\u003e22 mm compression\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;font-weight:600;\"\u003ePrimary Coil Thermostat (pre-set \/ range)\u003c\/td\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;\"\u003e65°C pre-set \/ adjustable 45–75°C\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;font-weight:600;\"\u003eMax Storage Temperature\u003c\/td\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;\"\u003e85°C\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;font-weight:600;\"\u003ePipe Connections (DHW)\u003c\/td\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;\"\u003e22 mm (all on top)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;font-weight:600;\"\u003eOverfill Connection\u003c\/td\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;\"\u003eG ¾\"\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;font-weight:600;\"\u003eCompatible Heat Sources\u003c\/td\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;\"\u003eGas boiler, oil boiler, LPG, district heating, heat pump\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;font-weight:600;\"\u003eOuter Tank Material\u003c\/td\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;\"\u003ePolyethylene\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;font-weight:600;\"\u003eInner Tank Material\u003c\/td\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;\"\u003ePolypropylene\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#fff;\"\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;font-weight:600;\"\u003eCoil Material\u003c\/td\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;\"\u003eStainless steel corrugated\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background:#f0faf9;\"\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;font-weight:600;\"\u003eMPN\u003c\/td\u003e\n      \u003ctd style=\"padding:10px 14px;border:1px solid #c8e6e3;\"\u003eHS150EPLUS\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003c!-- Amber warning callout --\u003e\n\u003cdiv style=\"background:#fff8e1;border-left:4px solid #f59e0b;padding:14px 18px;border-radius:6px;margin-bottom:28px;\"\u003e\n  \u003cstrong style=\"color:#92400e;\"\u003ePrimary Circuit Requirement:\u003c\/strong\u003e The primary heating circuit supplying heat to the PLUS model must be \u003cstrong\u003efully pumped\u003c\/strong\u003e — gravity circulation is not suitable. The primary coil thermostat is factory pre-set to 65°C and should be adjusted only by a competent engineer. Isolate the power supply before removing any protective covers.\n\u003c\/div\u003e\n\n\u003c!-- FAQ --\u003e\n\u003cdiv style=\"background:#008377CF;color:#fff;padding:10px 16px;border-radius:6px;margin-bottom:18px;\"\u003e\n  \u003cstrong style=\"font-size:16px;\"\u003eFrequently Asked Questions\u003c\/strong\u003e\n\u003c\/div\u003e\n\n\u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n  \u003csummary style=\"background:#008377CF;color:#fff;padding:12px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eWhat is the difference between the HeatStream Electric and the HeatStream Electric PLUS?\u003c\/summary\u003e\n  \u003cdiv style=\"padding:14px 16px;background:#f0faf9;\"\u003e\n    The core difference is a \u003cstrong\u003efactory-fitted primary heating coil\u003c\/strong\u003e. The standard Electric model uses electric immersion heaters only. The Electric PLUS adds a \u003cstrong\u003estainless steel primary coil\u003c\/strong\u003e connected to a boiler or other external heat source, enabling much faster heat-up (20 minutes vs 78–156 minutes electrically) and compatibility with gas, oil, LPG, district heating or heat pump circuits.\n  \u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n  \u003csummary style=\"background:#008377CF;color:#fff;padding:12px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eIs the HeatStream 150 Indirect compatible with a heat pump?\u003c\/summary\u003e\n  \u003cdiv style=\"padding:14px 16px;background:#f0faf9;\"\u003e\n    Yes. The primary coil operates with any \u003cstrong\u003efully pumped heat source\u003c\/strong\u003e, including air source and ground source heat pumps. The coil's large stainless steel surface area and low pressure drop (107 mbar at 15 l\/min) are well matched to the lower flow temperatures and higher flow rates typical of heat pump systems.\n  \u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n  \u003csummary style=\"background:#008377CF;color:#fff;padding:12px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eWhy is the primary coil rated to 14 bar?\u003c\/summary\u003e\n  \u003cdiv style=\"padding:14px 16px;background:#f0faf9;\"\u003e\n    The \u003cstrong\u003e14-bar primary coil rating\u003c\/strong\u003e makes the HS150EPLUS fully compatible with high-pressure \u003cstrong\u003edistrict heating networks\u003c\/strong\u003e, which can operate at significantly higher pressures than domestic boilers. This makes it suitable for apartment blocks and mixed-use developments connected to communal or district systems.\n  \u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n  \u003csummary style=\"background:#008377CF;color:#fff;padding:12px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eDoes the HeatStream 150 Indirect need a G3-qualified engineer?\u003c\/summary\u003e\n  \u003cdiv style=\"padding:14px 16px;background:#f0faf9;\"\u003e\n    No. As an \u003cstrong\u003eopen-vented thermal store\u003c\/strong\u003e, the HS150EPLUS does not fall under the unvented Part G regulations and no G3 qualification is required. Any competent heating engineer can install it. Building regulations applicable are Northern Ireland Technical Booklet P3, Republic of Ireland TGD L, and England \u0026amp; Wales Approved Document G3 (as an open-vented exempt product).\n  \u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n  \u003csummary style=\"background:#008377CF;color:#fff;padding:12px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eHow does the primary coil thermostat work?\u003c\/summary\u003e\n  \u003cdiv style=\"padding:14px 16px;background:#f0faf9;\"\u003e\n    The factory-fitted \u003cstrong\u003eprimary coil thermostat is pre-set to 65°C\u003c\/strong\u003e and is adjustable between 45°C and 75°C to suit different heat sources and desired store temperatures. An integrated high-limit safety stat cuts power to the circuit if the store overheats, requiring a manual reset once the water has cooled.\n  \u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003cdetails style=\"border:1px solid #c8e6e3;border-radius:6px;margin-bottom:10px;overflow:hidden;\"\u003e\n  \u003csummary style=\"background:#008377CF;color:#fff;padding:12px 16px;cursor:pointer;font-weight:600;list-style:none;\"\u003eWhat maintenance does the HeatStream 150 Indirect require?\u003c\/summary\u003e\n  \u003cdiv style=\"padding:14px 16px;background:#f0faf9;\"\u003e\n    Maintenance requirements are deliberately minimal: the \u003cstrong\u003einternal water level should be topped up every 6 months\u003c\/strong\u003e via the filling loop. No annual safety inspection is required. It is also recommended that a \u003cstrong\u003ecentral heating filter\u003c\/strong\u003e is fitted on the primary heat supply circuit to protect internal coil components.\n  \u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003c\/div\u003e","brand":"Harlequin","offers":[{"title":"Default Title","offer_id":64634142228829,"sku":"HS150EPLUS","price":1595.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/HarlequinHeatStream150DirectElectricThermalStore.webp?v=1778136433","url":"https:\/\/qualityheating.co.uk\/products\/harlequin-heatstream-150-indirect-electric-plus-thermal-store","provider":"AIZO Quality Heating","version":"1.0","type":"link"}