{"product_id":"harlequin-heatstream-150-direct-electric-thermal-store","title":"Harlequin HeatStream 150L Direct Electric 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\u003c!-- Intro --\u003e\n\u003cp style=\"font-size: 17px; margin-bottom: 20px;\"\u003eThe \u003cstrong\u003eHarlequin HeatStream 150 Direct\u003c\/strong\u003e (model \u003cstrong\u003eHS150E\u003c\/strong\u003e) is a \u003cstrong\u003e150-litre open-vented thermal store\u003c\/strong\u003e designed to deliver \u003cstrong\u003emains-pressurised hot water\u003c\/strong\u003e in flats, apartments and electrically heated properties — without the complexity or regulatory burden of a traditional unvented cylinder. Because it operates on the open-vented thermal store principle, it is \u003cstrong\u003enot subject to Part G of the Building Regulations\u003c\/strong\u003e in the UK and requires \u003cstrong\u003eno G3 qualification\u003c\/strong\u003e for installation. With an \u003cstrong\u003eErP 'B' energy rating\u003c\/strong\u003e and a compact \u003cstrong\u003e520 mm × 520 mm square footprint\u003c\/strong\u003e, it is the ideal upgrade for modern airing cupboards and new-build apartments alike.\u003c\/p\u003e\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: bold;\"\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: bold;\"\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: bold;\"\u003e520 mm²\u003c\/div\u003e\n\u003cdiv style=\"font-size: 13px; margin-top: 4px;\"\u003eSquare Footprint\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: bold;\"\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\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: bold;\"\u003e3 kW + 3 kW\u003c\/div\u003e\n\u003cdiv style=\"font-size: 13px; margin-top: 4px;\"\u003eDual Immersion Heaters\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\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;\"\u003eOpen-Vented Design — No Part G Compliance Required:\u003c\/strong\u003e Unlike traditional unvented hot water cylinders, the HeatStream 150 Direct is open-vented. This means there is no requirement for an expansion vessel, T\u0026amp;P relief valve or mandatory annual safety inspection — dramatically simplifying installation and ongoing ownership.\u003c\/div\u003e\n\u003c!-- Section heading --\u003e\n\u003cdiv style=\"background: #008377CF; color: #fff; padding: 10px 16px; border-radius: 6px; margin-bottom: 18px;\"\u003e\u003cstrong style=\"font-size: 16px;\"\u003eKey Features\u003c\/strong\u003e\u003c\/div\u003e\n\u003c!-- Feature grid --\u003e\n\u003cdiv style=\"display: grid; grid-template-columns: repeat(auto-fill,minmax(260px,1fr)); gap: 16px; margin-bottom: 28px;\"\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 18px;\"\u003e\n\u003cdiv style=\"font-weight: bold; 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 operation means the unit \u003cstrong\u003ebypasses Part G of the Building Regulations\u003c\/strong\u003e. Any competent heating engineer can install it — no G3 qualification, no expansion vessel, no T\u0026amp;P relief valve needed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 18px;\"\u003e\n\u003cdiv style=\"font-weight: bold; color: #005c54; margin-bottom: 8px;\"\u003e⚡ Dual Immersion Heater — Fast Boost\u003c\/div\u003e\n\u003cp style=\"margin: 0; font-size: 15px;\"\u003eSupplied with a \u003cstrong\u003e3 kW + 3 kW dual-element immersion heater\u003c\/strong\u003e. The \u003cstrong\u003eshort boost element delivers 50 litres of hot water in just 20 minutes\u003c\/strong\u003e, perfect for morning demand peaks or off-peak tariff charging strategies.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 18px;\"\u003e\n\u003cdiv style=\"font-weight: bold; color: #005c54; margin-bottom: 8px;\"\u003e☀️ Solar PV \u0026amp; Off-Peak Tariff Ready\u003c\/div\u003e\n\u003cp style=\"margin: 0; font-size: 15px;\"\u003eDesigned to \u003cstrong\u003emaximise off-peak electricity tariffs and solar PV surplus energy\u003c\/strong\u003e. The large thermal mass stores cheap-rate energy efficiently, reducing running costs over time.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 18px;\"\u003e\n\u003cdiv style=\"font-weight: bold; color: #005c54; margin-bottom: 8px;\"\u003e📐 Compact 520 × 520 mm Footprint\u003c\/div\u003e\n\u003cp style=\"margin: 0; font-size: 15px;\"\u003eThe \u003cstrong\u003esquare 520 × 520 mm base fits through a standard doorway\u003c\/strong\u003e and sits comfortably in a small airing cupboard. At \u003cstrong\u003e1,315 mm tall\u003c\/strong\u003e, it stores significantly more hot water within a smaller footprint than equivalent cylinders.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 18px;\"\u003e\n\u003cdiv style=\"font-weight: bold; color: #005c54; margin-bottom: 8px;\"\u003e🛡️ Durable Non-Corrosive Construction\u003c\/div\u003e\n\u003cp style=\"margin: 0; font-size: 15px;\"\u003e\u003cstrong\u003eOuter shell in tough polyethylene\u003c\/strong\u003e resists transport damage; the \u003cstrong\u003einner tank is non-corrosive polypropylene\u003c\/strong\u003e, making it suitable even in hard or poor-quality water areas. \u003cstrong\u003eStainless steel corrugated coils\u003c\/strong\u003e deliver fast heat transfer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 18px;\"\u003e\n\u003cdiv style=\"font-weight: bold; color: #005c54; margin-bottom: 8px;\"\u003e🔧 Minimal Maintenance\u003c\/div\u003e\n\u003cp style=\"margin: 0; font-size: 15px;\"\u003eMaintenance consists of a \u003cstrong\u003e6-monthly water top-up via the filling loop\u003c\/strong\u003e — no annual safety inspection is required. \u003cstrong\u003eAll connections are on top\u003c\/strong\u003e of the unit, simplifying installation and any future servicing visits.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 18px;\"\u003e\n\u003cdiv style=\"font-weight: bold; color: #005c54; margin-bottom: 8px;\"\u003e🦠 Reduced Legionella Risk\u003c\/div\u003e\n\u003cp style=\"margin: 0; font-size: 15px;\"\u003eThe thermostatic mixing valve (supplied) is \u003cstrong\u003eset nominally to 45°C for safe delivery\u003c\/strong\u003e, while the long immersion heater can raise store temperatures to pasteurise against Legionella risk when required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #f0faf9; border: 1px solid #c8e6e3; border-radius: 8px; padding: 18px;\"\u003e\n\u003cdiv style=\"font-weight: bold; color: #005c54; margin-bottom: 8px;\"\u003e🏗️ Ideal for New Builds \u0026amp; Flats\u003c\/div\u003e\n\u003cp style=\"margin: 0; font-size: 15px;\"\u003eSpecifically engineered for \u003cstrong\u003eapartments, flats, houses and bungalows\u003c\/strong\u003e. The simple overfill pipe can run externally or to an internal low-temperature waste — no specialist discharge arrangement required.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Spec table --\u003e\n\u003cdiv style=\"background: #008377CF; color: #fff; padding: 10px 16px; border-radius: 6px; margin-bottom: 18px;\"\u003e\u003cstrong style=\"font-size: 16px;\"\u003eTechnical Specifications\u003c\/strong\u003e\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;\"\u003eHS150E\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;\"\u003e36 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;\"\u003e188 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), 27\" + full-depth\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;\"\u003eThermostat Pre-Set\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #c8e6e3;\"\u003eNominally 70°C (adjustable)\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 (15–60°C, long element)\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 (15–60°C, both elements)\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\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 Available at 15 l\/min (60°C store)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #c8e6e3;\"\u003e113 litres (no reheat) \/ 50 litres (with boost 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 Available 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;\"\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\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;\"\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: #fff;\"\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: #f0faf9;\"\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: #fff;\"\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #c8e6e3; font-weight: 600;\"\u003eMinimum Mains Flow (recommended)\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #c8e6e3;\"\u003e12 l\/min at 1 bar dynamic pressure\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;\"\u003eMax Inlet Pressure\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #c8e6e3;\"\u003e3 bar (PRV recommended above this)\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;\"\u003eTypical Building Type\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 14px; border: 1px solid #c8e6e3;\"\u003eFlats, Apartments, Houses, Bungalows\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;\"\u003eHS150E\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\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;\"\u003eInstallation Note:\u003c\/strong\u003e The HeatStream 150 Direct requires an overfill connection — either to an external pipe or to a low-temperature internal waste pipe. Models with an internal overfill (SOJ variants) require no external connection. A minimum mains supply of \u003cstrong\u003e12 l\/min at 1 bar dynamic pressure\u003c\/strong\u003e is recommended for optimum performance. Incoming supply pressure must not exceed \u003cstrong\u003e3 bar\u003c\/strong\u003e without a pressure reducing valve.\u003c\/div\u003e\n\u003c!-- FAQ --\u003e\n\u003cdiv style=\"background: #008377CF; color: #fff; padding: 10px 16px; border-radius: 6px; margin-bottom: 18px;\"\u003e\u003cstrong style=\"font-size: 16px;\"\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/div\u003e\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 Direct require a G3-qualified installer?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 16px; background: #f0faf9;\"\u003eNo. Because the HeatStream 150 Direct is an \u003cstrong\u003eopen-vented thermal store\u003c\/strong\u003e rather than a traditional unvented cylinder, it does \u003cstrong\u003enot require a G3-qualified engineer\u003c\/strong\u003e and is exempt from the unvented discharge requirements of Part G of the Building Regulations. Any competent heating technician can install it.\u003c\/div\u003e\n\u003c\/details\u003e\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 much hot water can the HS150E deliver before it needs to reheat?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 16px; background: #f0faf9;\"\u003eAt a draw-off rate of 15 l\/min with a store temperature of 60°C, the HS150E delivers \u003cstrong\u003e113 litres of usable hot water\u003c\/strong\u003e without reheating. At 70°C store temperature this rises to \u003cstrong\u003e180 litres\u003c\/strong\u003e. The boost immersion element can provide an additional \u003cstrong\u003e50 litres within 20 minutes\u003c\/strong\u003e.\u003c\/div\u003e\n\u003c\/details\u003e\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;\"\u003eCan the HeatStream 150 Direct use solar PV or an off-peak electricity tariff?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 16px; background: #f0faf9;\"\u003eYes — this is one of its key strengths. The large thermal mass is ideal for storing energy from \u003cstrong\u003esolar PV surplus\u003c\/strong\u003e or overnight \u003cstrong\u003eoff-peak electricity tariffs\u003c\/strong\u003e (such as Agile or Economy 7), reducing the cost of heating hot water significantly over time.\u003c\/div\u003e\n\u003c\/details\u003e\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 require?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 16px; background: #f0faf9;\"\u003eMaintenance is minimal: the internal water level should be topped up via the \u003cstrong\u003efilling loop every 6 months\u003c\/strong\u003e. No annual safety inspection is required. There are very few spare parts and no expansion vessel or T\u0026amp;P valve to service.\u003c\/div\u003e\n\u003c\/details\u003e\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;\"\u003eWill the HeatStream 150 Direct fit in a standard airing cupboard?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 16px; background: #f0faf9;\"\u003eYes. The \u003cstrong\u003e520 × 520 mm square footprint\u003c\/strong\u003e is specifically designed to fit through a standard door opening and into the smaller airing cupboards common in new-build flats and apartments. At 1,315 mm tall, it is a practical choice where ceiling height is not restricted.\u003c\/div\u003e\n\u003c\/details\u003e\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 Direct suitable for hard water areas?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 16px; background: #f0faf9;\"\u003eYes. The \u003cstrong\u003enon-corrosive polypropylene inner tank\u003c\/strong\u003e and \u003cstrong\u003estainless steel coils\u003c\/strong\u003e are well-suited to challenging water quality. The installation manual specifies a maximum total hardness of 200 mg\/litre and chloride content below 300 mg\/litre; where water exceeds this, appropriate treatment should be installed upstream.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e","brand":"Harlequin","offers":[{"title":"Default Title","offer_id":64634066010461,"sku":"HS150E","price":1395.0,"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-direct-electric-thermal-store","provider":"AIZO Quality Heating","version":"1.0","type":"link"}