{"product_id":"ehs-flex-heat-only-electric-boiler-12kw-range-rateable-2-12kw","title":"EHS Flex Heat Only Electric Boiler 12kW (Range-Rateable 2–12kW)","description":"\u003cdiv style=\"font-size: 16px; max-width: 900px; margin: 0 auto; font-family: Arial, Helvetica, sans-serif; color: #222; line-height: 1.55;\"\u003e\n\u003cp\u003eThe \u003cstrong\u003eEHS Flex Heat Only Electric Boiler\u003c\/strong\u003e is a \u003cstrong\u003erange-rateable\u003c\/strong\u003e electric boiler that can be configured anywhere from \u003cstrong\u003e2kW up to a full 12kW output\u003c\/strong\u003e, letting a single unit be specified across a wide range of property sizes instead of stocking multiple fixed-output models. Designed to work alongside a \u003cstrong\u003eseparate hot water cylinder\u003c\/strong\u003e (vented or unvented), it is built for homes without mains gas, off-grid properties, and retrofits where a \u003cstrong\u003eflue-free\u003c\/strong\u003e, low-maintenance heat source is needed. The boiler is \u003cstrong\u003epre-wired\u003c\/strong\u003e with an \u003cstrong\u003eintegrated pump\u003c\/strong\u003e and internal expansion vessel, and produces \u003cstrong\u003ezero carbon monoxide or combustion emissions\u003c\/strong\u003e at the point of use.\u003c\/p\u003e\n\u003c!-- Stat strip --\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 24px 0;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 16.6%; background: #008377CF; color: #fff; text-align: center; padding: 14px 6px; border-right: 2px solid #fff;\"\u003e\n\u003cdiv style=\"font-size: 20px; font-weight: bold;\"\u003e12kW\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px;\"\u003eHeat Output\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 16.6%; background: #008377CF; color: #fff; text-align: center; padding: 14px 6px; border-right: 2px solid #fff;\"\u003e\n\u003cdiv style=\"font-size: 20px; font-weight: bold;\"\u003e2–12kW\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px;\"\u003eRange-Rateable\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 16.6%; background: #008377CF; color: #fff; text-align: center; padding: 14px 6px; border-right: 2px solid #fff;\"\u003e\n\u003cdiv style=\"font-size: 20px; font-weight: bold;\"\u003e100%\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px;\"\u003eEfficient at Point of Use\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 16.6%; background: #008377CF; color: #fff; text-align: center; padding: 14px 6px; border-right: 2px solid #fff;\"\u003e\n\u003cdiv style=\"font-size: 20px; font-weight: bold;\"\u003eNo Flue\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px;\"\u003eRequired\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 16.6%; background: #008377CF; color: #fff; text-align: center; padding: 14px 6px; border-right: 2px solid #fff;\"\u003e\n\u003cdiv style=\"font-size: 20px; font-weight: bold;\"\u003eHeat Only\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px;\"\u003eRegular Boiler\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 16.6%; background: #008377CF; color: #fff; text-align: center; padding: 14px 6px;\"\u003e\n\u003cdiv style=\"font-size: 20px; font-weight: bold;\"\u003e5 Years\u003c\/div\u003e\n\u003cdiv style=\"font-size: 12px;\"\u003eManufacturer Guarantee\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c!-- Red safety callout --\u003e\n\u003cdiv style=\"background: #FDECEA; border-left: 5px solid #D93025; padding: 14px 18px; margin: 18px 0; border-radius: 4px;\"\u003e\n\u003cstrong\u003e🔴 Electrical Installation:\u003c\/strong\u003e This boiler must be installed and commissioned by a \u003cstrong\u003equalified heating engineer and a qualified electrician\u003c\/strong\u003e in accordance with current \u003cstrong\u003eBS7671 IEE Wiring Regulations\u003c\/strong\u003e and Building Regulations. The unit must never be opened for servicing or wiring access without first isolating the electrical supply.\u003c\/div\u003e\n\u003c!-- Amber callout - mandatory ancillary --\u003e\n\u003cdiv style=\"background: #FFF4E5; border-left: 5px solid #E8A317; padding: 14px 18px; margin: 18px 0; border-radius: 4px;\"\u003e\n\u003cstrong\u003e🟡 Automatic Bypass Valve Required:\u003c\/strong\u003e An \u003cstrong\u003eAutomatic Bypass Valve (ABV)\u003c\/strong\u003e is not built into this unit and must be fitted as part of the heating circuit, opening as soon as the first radiator valve or actuator closes. This is a mandatory installation requirement, not an optional extra.\u003c\/div\u003e\n\u003c!-- Amber callout - data gap transparency --\u003e\u003c!-- Teal informational callout --\u003e\n\u003cdiv style=\"background: #E6F5F3; border-left: 5px solid #008377CF; padding: 14px 18px; margin: 18px 0; border-radius: 4px;\"\u003e\n\u003cstrong\u003e🟢 Built for Off-Gas and Solar-Ready Homes:\u003c\/strong\u003e With no flue, no annual gas safety certification, and full compatibility with \u003cstrong\u003esolar PV systems\u003c\/strong\u003e and \u003cstrong\u003eoff-peak electricity tariffs\u003c\/strong\u003e, this boiler suits properties transitioning away from gas as well as new-build off-gas heating strategies.\u003c\/div\u003e\n\u003c!-- Feature grid --\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 24px 0;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 50%; vertical-align: top; padding: 14px; border: 1px solid #ddd;\"\u003e\n\u003cdiv style=\"color: #008377cf; font-weight: bold; margin-bottom: 6px;\"\u003eRange-Rated Output\u003c\/div\u003e\n\u003cdiv\u003eBecause a single unit modulates from 2kW to 12kW, installers spec one boiler across a range of heat-loss calculations rather than stocking multiple fixed-output models — reducing oversizing and the energy waste that comes with it.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 50%; vertical-align: top; padding: 14px; border: 1px solid #ddd;\"\u003e\n\u003cdiv style=\"color: #008377cf; font-weight: bold; margin-bottom: 6px;\"\u003eIntegrated Pump \u0026amp; Expansion Vessel\u003c\/div\u003e\n\u003cdiv\u003eThe circulating pump and expansion vessel are built into the casing, cutting down on the ancillary parts and pipework an installer needs to source and fit on site.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 50%; vertical-align: top; padding: 14px; border: 1px solid #ddd;\"\u003e\n\u003cdiv style=\"color: #008377cf; font-weight: bold; margin-bottom: 6px;\"\u003eNo Flue, No Combustion\u003c\/div\u003e\n\u003cdiv\u003eWith no burner or flue, there's no carbon monoxide risk and no annual gas safety inspection to schedule — simplifying both the installation location and the ongoing compliance burden for the homeowner.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 50%; vertical-align: top; padding: 14px; border: 1px solid #ddd;\"\u003e\n\u003cdiv style=\"color: #008377cf; font-weight: bold; margin-bottom: 6px;\"\u003ePre-Wired Electronics\u003c\/div\u003e\n\u003cdiv\u003eInternal wiring is completed at the factory, reducing the electrician's time on site to making the final mains and control connections rather than building up the control circuit from scratch.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 50%; vertical-align: top; padding: 14px; border: 1px solid #ddd;\"\u003e\n\u003cdiv style=\"color: #008377cf; font-weight: bold; margin-bottom: 6px;\"\u003eWorks With Existing Cylinders\u003c\/div\u003e\n\u003cdiv\u003eAs a heat-only unit, it's designed to pair with a separate vented or unvented cylinder already on-site, making it a straightforward swap for a gas regular boiler without redesigning the hot water side of the system.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003ctd style=\"width: 50%; vertical-align: top; padding: 14px; border: 1px solid #ddd;\"\u003e\n\u003cdiv style=\"color: #008377cf; font-weight: bold; margin-bottom: 6px;\"\u003eTariff and Solar Flexibility\u003c\/div\u003e\n\u003cdiv\u003eBecause output is electric and modulating, the boiler can be timed around off-peak tariff windows or paired with solar PV generation to shift running costs to cheaper or self-generated electricity.\u003c\/div\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c!-- Spec table --\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 24px 0;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" style=\"background: #008377CF; color: #fff; font-weight: bold; padding: 10px 14px;\"\u003eGeneral\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f7f7f7;\"\u003e\n\u003ctd style=\"padding: 8px 14px; border-bottom: 1px solid #eee;\"\u003eBoiler Type\u003c\/td\u003e\n\u003ctd style=\"padding: 8px 14px; border-bottom: 1px solid #eee;\"\u003eHeat Only (Regular) Electric Boiler\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px 14px; border-bottom: 1px solid #eee;\"\u003eFuel Type\u003c\/td\u003e\n\u003ctd style=\"padding: 8px 14px; border-bottom: 1px solid #eee;\"\u003eElectric\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f7f7f7;\"\u003e\n\u003ctd style=\"padding: 8px 14px; border-bottom: 1px solid #eee;\"\u003eHeat Output\u003c\/td\u003e\n\u003ctd style=\"padding: 8px 14px; border-bottom: 1px solid #eee;\"\u003e12kW (range-rateable 2–12kW)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px 14px; border-bottom: 1px solid #eee;\"\u003eFlow Temperature Range\u003c\/td\u003e\n\u003ctd style=\"padding: 8px 14px; border-bottom: 1px solid #eee;\"\u003e20°C – 80°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f7f7f7;\"\u003e\n\u003ctd style=\"padding: 8px 14px; border-bottom: 1px solid #eee;\"\u003eColour\u003c\/td\u003e\n\u003ctd style=\"padding: 8px 14px; border-bottom: 1px solid #eee;\"\u003eWhite\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" style=\"background: #008377CF; color: #fff; font-weight: bold; padding: 10px 14px;\"\u003eSystem \u0026amp; Compatibility\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f7f7f7;\"\u003e\n\u003ctd style=\"padding: 8px 14px; border-bottom: 1px solid #eee;\"\u003eHot Water Cylinder Compatibility\u003c\/td\u003e\n\u003ctd style=\"padding: 8px 14px; border-bottom: 1px solid #eee;\"\u003eVented and unvented cylinders\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px 14px; border-bottom: 1px solid #eee;\"\u003ePump\u003c\/td\u003e\n\u003ctd style=\"padding: 8px 14px; border-bottom: 1px solid #eee;\"\u003eIntegrated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f7f7f7;\"\u003e\n\u003ctd style=\"padding: 8px 14px; border-bottom: 1px solid #eee;\"\u003eExpansion Vessel\u003c\/td\u003e\n\u003ctd style=\"padding: 8px 14px; border-bottom: 1px solid #eee;\"\u003eInternal, 5 litres\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px 14px; border-bottom: 1px solid #eee;\"\u003eFlue\u003c\/td\u003e\n\u003ctd style=\"padding: 8px 14px; border-bottom: 1px solid #eee;\"\u003eNot required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f7f7f7;\"\u003e\n\u003ctd style=\"padding: 8px 14px; border-bottom: 1px solid #eee;\"\u003eAutomatic Bypass Valve\u003c\/td\u003e\n\u003ctd style=\"padding: 8px 14px; border-bottom: 1px solid #eee;\"\u003eRequired on installation — not included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px 14px; border-bottom: 1px solid #eee;\"\u003eSolar PV \/ Off-Peak Tariff Compatible\u003c\/td\u003e\n\u003ctd style=\"padding: 8px 14px; border-bottom: 1px solid #eee;\"\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" style=\"background: #008377CF; color: #fff; font-weight: bold; padding: 10px 14px;\"\u003eCompliance \u0026amp; Identification\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f7f7f7;\"\u003e\n\u003ctd style=\"padding: 8px 14px; border-bottom: 1px solid #eee;\"\u003eWiring Standard\u003c\/td\u003e\n\u003ctd style=\"padding: 8px 14px; border-bottom: 1px solid #eee;\"\u003eBS7671 IEE Wiring Regulations\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px 14px; border-bottom: 1px solid #eee;\"\u003eManufacturer Guarantee\u003c\/td\u003e\n\u003ctd style=\"padding: 8px 14px; border-bottom: 1px solid #eee;\"\u003e5 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background: #f7f7f7;\"\u003e\n\u003ctd style=\"padding: 8px 14px; border-bottom: 1px solid #eee;\"\u003eMPN\u003c\/td\u003e\n\u003ctd style=\"padding: 8px 14px; border-bottom: 1px solid #eee;\"\u003eALS1-1PHO-12F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px 14px;\"\u003eEAN\u003c\/td\u003e\n\u003ctd style=\"padding: 8px 14px;\"\u003e5065008142300\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c!-- FAQs --\u003e\n\u003cdiv style=\"margin: 24px 0;\"\u003e\n\u003cdetails style=\"margin-bottom: 8px; border: 1px solid #ddd; border-radius: 4px;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #fff; padding: 10px 14px; cursor: pointer; font-weight: bold;\"\u003eWhat's the difference between this and an electric combi boiler?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 12px 14px;\"\u003eThis is a \u003cstrong\u003eheat-only (regular) boiler\u003c\/strong\u003e — it provides central heating but relies on a separate hot water cylinder for domestic hot water, rather than heating water on demand like a combi.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 8px; border: 1px solid #ddd; border-radius: 4px;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #fff; padding: 10px 14px; cursor: pointer; font-weight: bold;\"\u003eDo I need a hot water cylinder to use this boiler?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 12px 14px;\"\u003eYes. It is designed to work alongside a separate \u003cstrong\u003evented or unvented cylinder\u003c\/strong\u003e already installed, or specified as part of the wider heating system.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 8px; border: 1px solid #ddd; border-radius: 4px;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #fff; padding: 10px 14px; cursor: pointer; font-weight: bold;\"\u003eDoes this boiler need a flue?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 12px 14px;\"\u003eNo. As a fully electric boiler with no combustion process, no flue is required, which gives more flexibility over where it can be sited.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 8px; border: 1px solid #ddd; border-radius: 4px;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #fff; padding: 10px 14px; cursor: pointer; font-weight: bold;\"\u003eCan the output be set below 12kW?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 12px 14px;\"\u003eYes. The boiler is \u003cstrong\u003erange-rateable from 2kW up to its full 12kW output\u003c\/strong\u003e, so it can be configured on installation to match the specific heat loss of the property.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 8px; border: 1px solid #ddd; border-radius: 4px;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #fff; padding: 10px 14px; cursor: pointer; font-weight: bold;\"\u003eDoes it need annual servicing like a gas boiler?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 12px 14px;\"\u003eThere's no requirement for an annual gas safety certificate since there's no gas supply or flue involved, though routine checks by a qualified electrician are still good practice for any fixed electrical appliance.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom: 8px; border: 1px solid #ddd; border-radius: 4px;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #fff; padding: 10px 14px; cursor: pointer; font-weight: bold;\"\u003eCan this boiler be paired with solar PV or an off-peak electricity tariff?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 12px 14px;\"\u003eYes. The boiler's electric, modulating output is compatible with \u003cstrong\u003esolar PV systems\u003c\/strong\u003e and can be scheduled around \u003cstrong\u003eoff-peak tariff\u003c\/strong\u003e windows to help reduce running costs.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"AIZO Quality Heating","offers":[{"title":"Default Title","offer_id":65245085827421,"sku":"ALS1-1PHO-12F","price":670.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/EHSFlexHeatOnlyElectricBoilerRange-Rateable2_12kW.jpg?v=1783961840","url":"https:\/\/qualityheating.co.uk\/products\/ehs-flex-heat-only-electric-boiler-12kw-range-rateable-2-12kw","provider":"AIZO Quality Heating","version":"1.0","type":"link"}