{"product_id":"thermosphere-electric-heat-only-boiler-4-5kw-15kw","title":"ThermoSphere Electric Heat Only Boiler (4.5kW-15kW)","description":"\u003c!-- SEO Product Name: ThermoSphere Electric Heat Only Boiler (4.5kW-15kW) | AIZO Quality Heating --\u003e\n\u003cdiv style=\"font-size: 16px; max-width: 900px; margin: 0 auto; color: #2b2b2b; line-height: 1.6; font-family: Arial, Helvetica, sans-serif;\"\u003e\n\u003cp style=\"font-size: 16px; line-height: 1.7; color: #2b2b2b; margin: 0 0 16px 0;\"\u003eThe \u003cstrong\u003eThermoSphere Electric Heat Only Boiler\u003c\/strong\u003e is a wall-mounted electric boiler designed to heat water for central heating radiators, wet underfloor heating circuits, and domestic hot water via an indirect cylinder coil. Built around a cluster of resistive heating elements housed in an insulated steel cylinder, it delivers a \u003cstrong\u003e99.8% efficient\u003c\/strong\u003e heat source with \u003cstrong\u003eno flue gas emissions\u003c\/strong\u003e and no fossil fuel burned on site.\u003c\/p\u003e\n\u003cp style=\"font-size: 16px; line-height: 1.7; color: #2b2b2b; margin: 0 0 16px 0;\"\u003eIt is the natural alternative to a gas or oil boiler for properties without a gas supply, or where flue routing and space are at a premium. The range spans \u003cstrong\u003e4.5kW to 15kW\u003c\/strong\u003e across five models, all sharing the same compact wall-mounted casing, plumbing layout and control logic — so sizing is simply a matter of matching output to heating\/hot water demand.\u003c\/p\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; border-radius: 8px; overflow: hidden; margin: 0 0 24px 0; border: 1px solid #008377CF;\"\u003e\n\u003cdiv style=\"flex: 1; min-width: 120px; text-align: center; padding: 14px 8px; background: #008377CF; border-right: 1px solid rgba(255,255,255,0.25);\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #fff; line-height: 1.2;\"\u003e4.5-15kW\u003c\/div\u003e\n\u003cdiv style=\"font-size: 11.5px; color: #e6f4f3; text-transform: uppercase; letter-spacing: 0.04em; margin-top: 4px;\"\u003eOutput Range\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; min-width: 120px; text-align: center; padding: 14px 8px; background: #008377CF; border-right: 1px solid rgba(255,255,255,0.25);\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #fff; line-height: 1.2;\"\u003e99.8%\u003c\/div\u003e\n\u003cdiv style=\"font-size: 11.5px; color: #e6f4f3; text-transform: uppercase; letter-spacing: 0.04em; margin-top: 4px;\"\u003eEfficiency\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; min-width: 120px; text-align: center; padding: 14px 8px; background: #008377CF; border-right: 1px solid rgba(255,255,255,0.25);\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #fff; line-height: 1.2;\"\u003e230\/400V\u003c\/div\u003e\n\u003cdiv style=\"font-size: 11.5px; color: #e6f4f3; text-transform: uppercase; letter-spacing: 0.04em; margin-top: 4px;\"\u003eSupply Options\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; min-width: 120px; text-align: center; padding: 14px 8px; background: #008377CF; border-right: 1px solid rgba(255,255,255,0.25);\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #fff; line-height: 1.2;\"\u003e65°C\u003c\/div\u003e\n\u003cdiv style=\"font-size: 11.5px; color: #e6f4f3; text-transform: uppercase; letter-spacing: 0.04em; margin-top: 4px;\"\u003eMax Temperature\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; min-width: 120px; text-align: center; padding: 14px 8px; background: #008377CF; border-right: 1px solid rgba(255,255,255,0.25);\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #fff; line-height: 1.2;\"\u003eIP22\u003c\/div\u003e\n\u003cdiv style=\"font-size: 11.5px; color: #e6f4f3; text-transform: uppercase; letter-spacing: 0.04em; margin-top: 4px;\"\u003eProtection Rating\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1; min-width: 120px; text-align: center; padding: 14px 8px; background: #008377CF; border-right: 1px solid rgba(255,255,255,0.25);\"\u003e\n\u003cdiv style=\"font-size: 19px; font-weight: bold; color: #fff; line-height: 1.2;\"\u003e5 Years\u003c\/div\u003e\n\u003cdiv style=\"font-size: 11.5px; color: #e6f4f3; text-transform: uppercase; letter-spacing: 0.04em; margin-top: 4px;\"\u003eWarranty\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #E6F4F3; border-left: 4px solid #008377CF; border-radius: 0 6px 6px 0; padding: 14px 18px; margin: 0 0 20px 0;\"\u003e\n\u003cdiv style=\"font-size: 12.5px; font-weight: bold; text-transform: uppercase; letter-spacing: 0.05em; color: #008377cf; margin-bottom: 6px;\"\u003eGood to Know\u003c\/div\u003e\n\u003cdiv style=\"font-size: 15px; line-height: 1.65; color: #2b2b2b;\"\u003eWorks with \u003cstrong\u003estandard radiators, programmers, thermostats and thermostatic radiator valves\u003c\/strong\u003e, and can be plumbed into an indirect hot water cylinder to provide domestic hot water alongside space heating — making it a straightforward drop-in for existing wet heating systems.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #FDECEC; border-left: 4px solid #D32F2F; border-radius: 0 6px 6px 0; padding: 14px 18px; margin: 0 0 20px 0;\"\u003e\n\u003cdiv style=\"font-size: 12.5px; font-weight: bold; text-transform: uppercase; letter-spacing: 0.05em; color: #d32f2f; margin-bottom: 6px;\"\u003eImportant Safety Information\u003c\/div\u003e\n\u003cdiv style=\"font-size: 15px; line-height: 1.65; color: #2b2b2b;\"\u003eThis appliance must only be \u003cstrong\u003einstalled and maintained by a qualified, competent professional\u003c\/strong\u003e. It must be safely earthed at all times, fed from a dedicated, suitably rated supply circuit with provision for safe electrical isolation, and the boiler must never be energised before the plumbing circuit is filled and pressurised. Models up to and including 12kW can run on single-phase (230V) or three-phase (400V) supply; the \u003cstrong\u003e15kW model is three-phase (400V) only\u003c\/strong\u003e.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display: flex; flex-wrap: wrap; gap: 14px; margin: 0 0 24px 0;\"\u003e\n\u003cdiv style=\"flex: 1 1 260px; background: #fff; border: 1px solid #D9EDEA; border-radius: 8px; padding: 16px 18px;\"\u003e\n\u003cdiv style=\"font-size: 15px; font-weight: bold; color: #008377cf; margin-bottom: 8px;\"\u003eZero On-Site Emissions\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14.5px; line-height: 1.6; color: #2b2b2b;\"\u003eWith \u003cstrong\u003e99.8% efficiency and no flue gas emissions\u003c\/strong\u003e, the boiler removes the need for any flue routing, making it ideal for flats, outbuildings or renovations where running a flue is impractical or impossible.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 260px; background: #fff; border: 1px solid #D9EDEA; border-radius: 8px; padding: 16px 18px;\"\u003e\n\u003cdiv style=\"font-size: 15px; font-weight: bold; color: #008377cf; margin-bottom: 8px;\"\u003eResistive Element Cluster Design\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14.5px; line-height: 1.6; color: #2b2b2b;\"\u003eHeat is generated by a cluster of \u003cstrong\u003eresistive heating elements\u003c\/strong\u003e housed inside an insulated steel cylinder, with cold water entering at the base and heated water leaving via the top flow connection.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 260px; background: #fff; border: 1px solid #D9EDEA; border-radius: 8px; padding: 16px 18px;\"\u003e\n\u003cdiv style=\"font-size: 15px; font-weight: bold; color: #008377cf; margin-bottom: 8px;\"\u003eSingle or Three-Phase Flexibility\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14.5px; line-height: 1.6; color: #2b2b2b;\"\u003eModels from 4.5kW to 12kW can be wired for \u003cstrong\u003esingle-phase (230V) or three-phase (400V) supply\u003c\/strong\u003e by removing a jumper clip on the live terminals, giving installers flexibility based on the property's existing supply.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 260px; background: #fff; border: 1px solid #D9EDEA; border-radius: 8px; padding: 16px 18px;\"\u003e\n\u003cdiv style=\"font-size: 15px; font-weight: bold; color: #008377cf; margin-bottom: 8px;\"\u003eBuilt-In Control Circuit Supply\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14.5px; line-height: 1.6; color: #2b2b2b;\"\u003eA \u003cstrong\u003e3 Amp fused control circuit supply\u003c\/strong\u003e is built into the boiler, removing the need for a separate fused spur when wiring in external thermostats or programmers.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 260px; background: #fff; border: 1px solid #D9EDEA; border-radius: 8px; padding: 16px 18px;\"\u003e\n\u003cdiv style=\"font-size: 15px; font-weight: bold; color: #008377cf; margin-bottom: 8px;\"\u003eDual Safety Cut-Out Protection\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14.5px; line-height: 1.6; color: #2b2b2b;\"\u003eA \u003cstrong\u003ethermal cut-out switch isolates the heating elements above 80°C\u003c\/strong\u003e, while the internal 3 Amp control circuit fuse protects the low-voltage control wiring.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex: 1 1 260px; background: #fff; border: 1px solid #D9EDEA; border-radius: 8px; padding: 16px 18px;\"\u003e\n\u003cdiv style=\"font-size: 15px; font-weight: bold; color: #008377cf; margin-bottom: 8px;\"\u003eCompact Wall-Mounted Footprint\u003c\/div\u003e\n\u003cdiv style=\"font-size: 14.5px; line-height: 1.6; color: #2b2b2b;\"\u003eAt just \u003cstrong\u003e220mm × 575mm × 115mm\u003c\/strong\u003e, the boiler mounts directly to a load-bearing wall with 500mm clearance recommended on all sides for safe access and servicing.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"overflow-x: auto; margin: 0 0 24px 0;\"\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 14.5px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" style=\"background: #008377CF; color: #fff; font-weight: bold; padding: 9px 14px; font-size: 12.5px; letter-spacing: 0.05em; text-transform: uppercase;\"\u003eGeneral\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 14px; font-weight: 600; color: #00625d; width: 42%; border-bottom: 1px solid #D9EDEA;\"\u003eDimensions (W×H×D)\u003c\/td\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 14px; color: #2b2b2b; border-bottom: 1px solid #D9EDEA;\"\u003e220mm × 575mm × 115mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #00625d; width: 42%; border-bottom: 1px solid #D9EDEA;\"\u003eMax working temperature\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #2b2b2b; border-bottom: 1px solid #D9EDEA;\"\u003e65°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 14px; font-weight: 600; color: #00625d; width: 42%; border-bottom: 1px solid #D9EDEA;\"\u003eMax working pressure\u003c\/td\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 14px; color: #2b2b2b; border-bottom: 1px solid #D9EDEA;\"\u003e2.0 BAR (rated system pressure 0.5-2 BAR; 1.5 BAR recommended)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #00625d; width: 42%; border-bottom: 1px solid #D9EDEA;\"\u003eProtection rating\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #2b2b2b; border-bottom: 1px solid #D9EDEA;\"\u003eIP22\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 14px; font-weight: 600; color: #00625d; width: 42%; border-bottom: 1px solid #D9EDEA;\"\u003eIEC protection\u003c\/td\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 14px; color: #2b2b2b; border-bottom: 1px solid #D9EDEA;\"\u003eClass I\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #00625d; width: 42%; border-bottom: 1px solid #D9EDEA;\"\u003eEfficiency\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #2b2b2b; border-bottom: 1px solid #D9EDEA;\"\u003e99.8%, zero flue gas emissions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 14px; font-weight: 600; color: #00625d; width: 42%; border-bottom: 1px solid #D9EDEA;\"\u003eWarranty\u003c\/td\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 14px; color: #2b2b2b; border-bottom: 1px solid #D9EDEA;\"\u003e5 years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd colspan=\"2\" style=\"background: #008377CF; color: #fff; font-weight: bold; padding: 9px 14px; font-size: 12.5px; letter-spacing: 0.05em; text-transform: uppercase;\"\u003eSafety \u0026amp; Control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 14px; font-weight: 600; color: #00625d; width: 42%; border-bottom: 1px solid #D9EDEA;\"\u003eThermal cut-out\u003c\/td\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 14px; color: #2b2b2b; border-bottom: 1px solid #D9EDEA;\"\u003eIsolates elements above 80°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #00625d; width: 42%; border-bottom: 1px solid #D9EDEA;\"\u003eControl circuit fuse\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #2b2b2b; border-bottom: 1px solid #D9EDEA;\"\u003eInternal 3 Amp fuse\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 14px; font-weight: 600; color: #00625d; width: 42%; border-bottom: 1px solid #D9EDEA;\"\u003eControl circuit supply\u003c\/td\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 14px; color: #2b2b2b; border-bottom: 1px solid #D9EDEA;\"\u003e3 Amp, built-in (no separate fused spur required)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #00625d; width: 42%; border-bottom: 1px solid #D9EDEA;\"\u003eCompatible controls\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #2b2b2b; border-bottom: 1px solid #D9EDEA;\"\u003eExternal room\/cylinder thermostats, programmers, TRVs, S Plan\/Y Plan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 14px; font-weight: 600; color: #00625d; width: 42%; border-bottom: 1px solid #D9EDEA;\"\u003ePlumbing connections\u003c\/td\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 14px; color: #2b2b2b; border-bottom: 1px solid #D9EDEA;\"\u003e3\/4\" BSP flow and return\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; font-weight: 600; color: #00625d; width: 42%; border-bottom: 1px solid #D9EDEA;\"\u003eEarthing\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 14px; color: #2b2b2b; border-bottom: 1px solid #D9EDEA;\"\u003eMust be permanently earthed to mains earth\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"overflow-x: auto; margin: 0 0 24px 0;\"\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 14px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"background: #008377CF; color: #fff; font-weight: bold; padding: 9px 12px; font-size: 12.5px; text-transform: uppercase; letter-spacing: 0.04em; text-align: left;\"\u003eCode\u003c\/th\u003e\n\u003cth style=\"background: #008377CF; color: #fff; font-weight: bold; padding: 9px 12px; font-size: 12.5px; text-transform: uppercase; letter-spacing: 0.04em; text-align: left;\"\u003eOutput\u003c\/th\u003e\n\u003cth style=\"background: #008377CF; color: #fff; font-weight: bold; padding: 9px 12px; font-size: 12.5px; text-transform: uppercase; letter-spacing: 0.04em; text-align: left;\"\u003eOutput per Element\u003c\/th\u003e\n\u003cth style=\"background: #008377CF; color: #fff; font-weight: bold; padding: 9px 12px; font-size: 12.5px; text-transform: uppercase; letter-spacing: 0.04em; text-align: left;\"\u003eVoltage\u003c\/th\u003e\n\u003cth style=\"background: #008377CF; color: #fff; font-weight: bold; padding: 9px 12px; font-size: 12.5px; text-transform: uppercase; letter-spacing: 0.04em; text-align: left;\"\u003eCurrent\u003c\/th\u003e\n\u003cth style=\"background: #008377CF; color: #fff; font-weight: bold; padding: 9px 12px; font-size: 12.5px; text-transform: uppercase; letter-spacing: 0.04em; text-align: left;\"\u003eWeight\u003c\/th\u003e\n\u003cth style=\"background: #008377CF; color: #fff; font-weight: bold; padding: 9px 12px; font-size: 12.5px; text-transform: uppercase; letter-spacing: 0.04em; text-align: left;\"\u003eEAN\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e\u003cstrong\u003eTSEFB-4.5\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e4.5kW\u003c\/td\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e1.5kW\u003c\/td\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e230\/400V\u003c\/td\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e21A\u003c\/td\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e13kg\u003c\/td\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e5056257307954\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e\u003cstrong\u003eTSEFB-6\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e6.0kW\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e2.0kW\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e230\/400V\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e27A\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e13kg\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e5056257307961\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e\u003cstrong\u003eTSEFB-9\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e9.0kW\u003c\/td\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e3.0kW\u003c\/td\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e230\/400V\u003c\/td\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e40A\u003c\/td\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e13kg\u003c\/td\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e5056257307978\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e\u003cstrong\u003eTSEFB-12\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e12.0kW\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e4.0kW\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e230\/400V\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e53A\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e13kg\u003c\/td\u003e\n\u003ctd style=\"background: #ffffff; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e5056257307985\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e\u003cstrong\u003eTSEFB-15\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e15.0kW\u003c\/td\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e5.0kW\u003c\/td\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e400V\u003c\/td\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e22A\u003c\/td\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e13kg\u003c\/td\u003e\n\u003ctd style=\"background: #E6F4F3; padding: 9px 12px; border-bottom: 1px solid #D9EDEA; color: #2b2b2b;\"\u003e5056257307992\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background: #FFF6E5; border-left: 4px solid #E0942A; border-radius: 0 6px 6px 0; padding: 14px 18px; margin: 0 0 20px 0;\"\u003e\n\u003cdiv style=\"font-size: 15px; line-height: 1.65; color: #2b2b2b;\"\u003eThe manufacturer's data sheet lists maximum working pressure as \u003cstrong\u003e2.0 BAR\u003c\/strong\u003e, while the installation manual states the safe operating range as \u003cstrong\u003e0.5-2 BAR\u003c\/strong\u003e, with 1.5 BAR recommended.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin: 0 0 20px 0;\"\u003e\n\u003cdetails style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #fff; font-weight: bold; padding: 12px 16px; cursor: pointer; font-size: 14.5px; list-style: none;\"\u003eCan this boiler provide domestic hot water as well as heating?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 16px; font-size: 14.5px; line-height: 1.65; color: #2b2b2b; background: #fff;\"\u003eYes. When plumbed into an \u003cstrong\u003eindirect hot water storage cylinder\u003c\/strong\u003e, the boiler can provide both central heating and domestic hot water from the same unit.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #fff; font-weight: bold; padding: 12px 16px; cursor: pointer; font-size: 14.5px; list-style: none;\"\u003eDoes the 15kW model work on a single-phase supply?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 16px; font-size: 14.5px; line-height: 1.65; color: #2b2b2b; background: #fff;\"\u003eNo. The \u003cstrong\u003eTSEFB-15 is 400V three-phase only\u003c\/strong\u003e. Models from 4.5kW to 12kW can run on either single-phase (230V) or three-phase (400V) supply.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #fff; font-weight: bold; padding: 12px 16px; cursor: pointer; font-size: 14.5px; list-style: none;\"\u003eDo I need a separate fused spur for room thermostats or programmers?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 16px; font-size: 14.5px; line-height: 1.65; color: #2b2b2b; background: #fff;\"\u003eNo. The boiler includes a \u003cstrong\u003ebuilt-in 3 Amp fused control circuit supply\u003c\/strong\u003e, so external controls can be powered directly from the boiler.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #fff; font-weight: bold; padding: 12px 16px; cursor: pointer; font-size: 14.5px; list-style: none;\"\u003eWhat size circuit breaker do I need?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 16px; font-size: 14.5px; line-height: 1.65; color: #2b2b2b; background: #fff;\"\u003eThe circuit breaker must be rated \u003cstrong\u003ehigher than the maximum current draw\u003c\/strong\u003e of the chosen model — for example, a boiler drawing 21A should be protected by at minimum a 25A MCB. Always confirm sizing with a qualified electrician.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #fff; font-weight: bold; padding: 12px 16px; cursor: pointer; font-size: 14.5px; list-style: none;\"\u003eCan this boiler be installed without a flue?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 16px; font-size: 14.5px; line-height: 1.65; color: #2b2b2b; background: #fff;\"\u003eYes. As an \u003cstrong\u003eelectric resistive-element boiler\u003c\/strong\u003e, it produces no flue gases and requires no flue, making it suitable for properties without gas or where flue routing isn't possible.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"border: 1px solid #D9EDEA; border-radius: 8px; margin-bottom: 10px; overflow: hidden;\"\u003e\n\u003csummary style=\"background: #008377CF; color: #fff; font-weight: bold; padding: 12px 16px; cursor: pointer; font-size: 14.5px; list-style: none;\"\u003eWhat is the warranty on this boiler?\u003c\/summary\u003e\n\u003cdiv style=\"padding: 14px 16px; font-size: 14.5px; line-height: 1.65; color: #2b2b2b; background: #fff;\"\u003eEach unit carries a \u003cstrong\u003e5-year warranty\u003c\/strong\u003e from Thermogroup Ltd, subject to installation by a qualified professional in accordance with the ThermoSphere instructions.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"ThermoSphere","offers":[{"title":"4.5KW 230\/400V","offer_id":65412014899549,"sku":"TSEFB-4.5","price":730.0,"currency_code":"GBP","in_stock":true},{"title":"6KW 230\/400V","offer_id":65412014932317,"sku":"TSEFB-6","price":750.0,"currency_code":"GBP","in_stock":true},{"title":"9KW 230\/400V","offer_id":65412014965085,"sku":"TSEFB-9","price":995.0,"currency_code":"GBP","in_stock":true},{"title":"12KW 230\/400V","offer_id":65412014997853,"sku":"TSEFB-12","price":1070.0,"currency_code":"GBP","in_stock":true},{"title":"15KW 400V","offer_id":65412015030621,"sku":"TSEFB-15","price":1100.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/ThermoSphereElectricHeatOnlyBoiler.jpg?v=1785396591","url":"https:\/\/qualityheating.co.uk\/products\/thermosphere-electric-heat-only-boiler-4-5kw-15kw","provider":"AIZO Quality Heating","version":"1.0","type":"link"}