{"product_id":"viessmann-vitodens-100-w-25kw-b1ga-heat-only-boiler-7098664","title":"Viessmann Vitodens 100-W 25kW B1GA Heat Only Boiler | 7098664","description":"\u003c!-- SEO Product Name: Viessmann Vitodens 100-W 25kW B1GA Heat Only Boiler | 7098664 --\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\u003eViessmann Vitodens 100-W B1GA\u003c\/strong\u003e is a heat-only (regular) gas condensing boiler, purpose-built for existing \u003cstrong\u003eopen vented or sealed heating systems\u003c\/strong\u003e where the property already has a separate hot water cylinder and feed\/expansion arrangement in place.\u003c\/p\u003e\n\u003cp style=\"font-size:16px; line-height:1.7; color:#2B2B2B; margin:0 0 16px 0;\"\u003eWith its \u003cstrong\u003ecompact 375mm-wide, 285mm-deep casing\u003c\/strong\u003e and light weight, this 25kW model is well suited to bungalow replacements and other properties where the existing cylinder and pipework are being retained rather than upgraded to a system boiler.\u003c\/p\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; margin:20px -4px 24px -4px;\"\u003e\n\u003cdiv style=\"flex:1 1 140px; min-width:120px; background:#F7FAFA; border:1px solid #D9EDEA; border-top:3px solid #008377CF; border-radius:6px; padding:14px 10px; text-align:center; margin:4px;\"\u003e\n\u003cdiv style=\"font-size:20px; font-weight:800; color:#00625D;\"\u003e25kW\u003c\/div\u003e\n\u003cdiv style=\"font-size:12px; color:#5A5A5A; margin-top:4px; line-height:1.3;\"\u003eHeat only output\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 140px; min-width:120px; background:#F7FAFA; border:1px solid #D9EDEA; border-top:3px solid #008377CF; border-radius:6px; padding:14px 10px; text-align:center; margin:4px;\"\u003e\n\u003cdiv style=\"font-size:20px; font-weight:800; color:#00625D;\"\u003e92%\u003c\/div\u003e\n\u003cdiv style=\"font-size:12px; color:#5A5A5A; margin-top:4px; line-height:1.3;\"\u003eErP efficiency (Hs)\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 140px; min-width:120px; background:#F7FAFA; border:1px solid #D9EDEA; border-top:3px solid #008377CF; border-radius:6px; padding:14px 10px; text-align:center; margin:4px;\"\u003e\n\u003cdiv style=\"font-size:20px; font-weight:800; color:#00625D;\"\u003eClass A\u003c\/div\u003e\n\u003cdiv style=\"font-size:12px; color:#5A5A5A; margin-top:4px; line-height:1.3;\"\u003eEnergy efficiency\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 140px; min-width:120px; background:#F7FAFA; border:1px solid #D9EDEA; border-top:3px solid #008377CF; border-radius:6px; padding:14px 10px; text-align:center; margin:4px;\"\u003e\n\u003cdiv style=\"font-size:20px; font-weight:800; color:#00625D;\"\u003e23kg\u003c\/div\u003e\n\u003cdiv style=\"font-size:12px; color:#5A5A5A; margin-top:4px; line-height:1.3;\"\u003eWeight\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 140px; min-width:120px; background:#F7FAFA; border:1px solid #D9EDEA; border-top:3px solid #008377CF; border-radius:6px; padding:14px 10px; text-align:center; margin:4px;\"\u003e\n\u003cdiv style=\"font-size:20px; font-weight:800; color:#00625D;\"\u003e285mm\u003c\/div\u003e\n\u003cdiv style=\"font-size:12px; color:#5A5A5A; margin-top:4px; line-height:1.3;\"\u003eDepth\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 140px; min-width:120px; background:#F7FAFA; border:1px solid #D9EDEA; border-top:3px solid #008377CF; border-radius:6px; padding:14px 10px; text-align:center; margin:4px;\"\u003e\n\u003cdiv style=\"font-size:20px; font-weight:800; color:#00625D;\"\u003e\u003cspan style=\"color:#008377CF;\"\u003eLambda Pro\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv style=\"font-size:12px; color:#5A5A5A; margin-top:4px; line-height:1.3;\"\u003eCombustion control\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#FFF6E5; border-left:4px solid #E0942A; border-radius:4px; padding:14px 16px; margin:0 0 20px 0; display:flex; align-items:flex-start; gap:10px;\"\u003e\n\u003cspan style=\"font-size:18px; line-height:1;\"\u003e🛈\u003c\/span\u003e\u003cdiv style=\"font-size:15px; color:#2B2B2B; line-height:1.55;\"\u003e\n\u003cstrong style=\"color:#E0942A;\"\u003ePlease Note:\u003c\/strong\u003e This boiler must be connected using the Viessmann 60\/100mm concentric flue system, tested and CE-designated as one structural unit with the boiler in accordance with DVGW-VP 113. Only this flue system may be used, with maximum flue lengths varying by model — check the installation manual for the exact figure.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#FFF6E5; border-left:4px solid #E0942A; border-radius:4px; padding:14px 16px; margin:0 0 20px 0; display:flex; align-items:flex-start; gap:10px;\"\u003e\n\u003cspan style=\"font-size:18px; line-height:1;\"\u003e🛈\u003c\/span\u003e\u003cdiv style=\"font-size:15px; color:#2B2B2B; line-height:1.55;\"\u003e\n\u003cstrong style=\"color:#E0942A;\"\u003ePlease Note:\u003c\/strong\u003e This is a heat-only appliance — it provides central heating output only and does not include a hot water cylinder or DHW heating function. It's compatible with any existing cylinder, open vented or sealed, but is \u003cstrong\u003enot compatible with solar thermal panels\u003c\/strong\u003e feeding the cylinder.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; flex-wrap:wrap; margin:0 -6px 24px -6px;\"\u003e\n\u003cdiv style=\"flex:1 1 260px; min-width:240px; background:#FFFFFF; border:1px solid #D9EDEA; border-radius:8px; padding:16px; margin:6px;\"\u003e\n\u003cdiv style=\"font-size:15.5px; font-weight:700; color:#00625D; margin-bottom:6px;\"\u003eIdeal for open vent or sealed system upgrades\u003c\/div\u003e\n\u003cdiv style=\"font-size:14.5px; color:#3A3A3A; line-height:1.55;\"\u003ePurpose-designed for \u003cstrong\u003eexisting heating systems\u003c\/strong\u003e where the cylinder and pipework are being retained during a boiler swap.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 260px; min-width:240px; background:#FFFFFF; border:1px solid #D9EDEA; border-radius:8px; padding:16px; margin:6px;\"\u003e\n\u003cdiv style=\"font-size:15.5px; font-weight:700; color:#00625D; margin-bottom:6px;\"\u003eLambda Pro combustion control\u003c\/div\u003e\n\u003cdiv style=\"font-size:14.5px; color:#3A3A3A; line-height:1.55;\"\u003eProvides \u003cstrong\u003eexceptional performance, high efficiency and low emissions\u003c\/strong\u003e across the boiler's modulation range.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 260px; min-width:240px; background:#FFFFFF; border:1px solid #D9EDEA; border-radius:8px; padding:16px; margin:6px;\"\u003e\n\u003cdiv style=\"font-size:15.5px; font-weight:700; color:#00625D; margin-bottom:6px;\"\u003eCompact, lightweight casing\u003c\/div\u003e\n\u003cdiv style=\"font-size:14.5px; color:#3A3A3A; line-height:1.55;\"\u003eAt just \u003cstrong\u003e23kg\u003c\/strong\u003e and a slim 375mm width, it suits tight cupboard spaces and bungalow-style installations.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 260px; min-width:240px; background:#FFFFFF; border:1px solid #D9EDEA; border-radius:8px; padding:16px; margin:6px;\"\u003e\n\u003cdiv style=\"font-size:15.5px; font-weight:700; color:#00625D; margin-bottom:6px;\"\u003eInox-Radial stainless steel heat exchanger\u003c\/div\u003e\n\u003cdiv style=\"font-size:14.5px; color:#3A3A3A; line-height:1.55;\"\u003eDelivers \u003cstrong\u003ecorrosion resistance\u003c\/strong\u003e and a long operational life on a compact footprint.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 260px; min-width:240px; background:#FFFFFF; border:1px solid #D9EDEA; border-radius:8px; padding:16px; margin:6px;\"\u003e\n\u003cdiv style=\"font-size:15.5px; font-weight:700; color:#00625D; margin-bottom:6px;\"\u003eTouchscreen control unit\u003c\/div\u003e\n\u003cdiv style=\"font-size:14.5px; color:#3A3A3A; line-height:1.55;\"\u003eOperating status, temperature and heating settings are all managed via the \u003cstrong\u003eLCD touch screen display\u003c\/strong\u003e.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"flex:1 1 260px; min-width:240px; background:#FFFFFF; border:1px solid #D9EDEA; border-radius:8px; padding:16px; margin:6px;\"\u003e\n\u003cdiv style=\"font-size:15.5px; font-weight:700; color:#00625D; margin-bottom:6px;\"\u003eWiFi ready with optional modem\u003c\/div\u003e\n\u003cdiv style=\"font-size:14.5px; color:#3A3A3A; line-height:1.55;\"\u003eInternet capability for the \u003cstrong\u003eViCare app\u003c\/strong\u003e is available via an optional WiFi modem accessory.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"font-size:19px; font-weight:700; color:#00625D; margin:32px 0 14px 0; padding-bottom:8px; border-bottom:2px solid #008377CF;\"\u003eSpecification\u003c\/div\u003e\n\u003cdiv style=\"background:#008377CF; color:#FFFFFF; font-weight:700; font-size:13.5px; letter-spacing:.04em; text-transform:uppercase; padding:9px 14px; border-radius:6px 6px 0 0; margin-top:14px;\"\u003ePerformance\u003c\/div\u003e\n\u003cdiv style=\"border:1px solid #D9EDEA; border-top:none; border-radius:0 0 6px 6px; overflow:hidden; margin-bottom:6px;\"\u003e\n\u003cdiv style=\"display:flex; background:#FFFFFF; border-bottom:1px solid #D9EDEA;\"\u003e\n\u003cdiv style=\"flex:0 0 46%; padding:9px 14px; font-weight:600; font-size:14px; color:#333333;\"\u003eBoiler type\u003c\/div\u003e\n\u003cdiv style=\"flex:1; padding:9px 14px; font-size:14px; color:#222222;\"\u003eGas condensing heat only boiler (Type B1GA)\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; background:#F7FAFA; border-bottom:1px solid #D9EDEA;\"\u003e\n\u003cdiv style=\"flex:0 0 46%; padding:9px 14px; font-weight:600; font-size:14px; color:#333333;\"\u003eRated heat output (50\/30°C)\u003c\/div\u003e\n\u003cdiv style=\"flex:1; padding:9px 14px; font-size:14px; color:#222222;\"\u003e3.2 – 25.0 kW\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; background:#FFFFFF; border-bottom:1px solid #D9EDEA;\"\u003e\n\u003cdiv style=\"flex:0 0 46%; padding:9px 14px; font-weight:600; font-size:14px; color:#333333;\"\u003eRated heat output (80\/60°C)\u003c\/div\u003e\n\u003cdiv style=\"flex:1; padding:9px 14px; font-size:14px; color:#222222;\"\u003e2.9 – 22.5 kW\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; background:#F7FAFA; border-bottom:1px solid #D9EDEA;\"\u003e\n\u003cdiv style=\"flex:0 0 46%; padding:9px 14px; font-weight:600; font-size:14px; color:#333333;\"\u003eErP efficiency (Hs)\u003c\/div\u003e\n\u003cdiv style=\"flex:1; padding:9px 14px; font-size:14px; color:#222222;\"\u003e92%\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; background:#FFFFFF; border-bottom:1px solid #D9EDEA;\"\u003e\n\u003cdiv style=\"flex:0 0 46%; padding:9px 14px; font-weight:600; font-size:14px; color:#333333;\"\u003eEnergy efficiency class\u003c\/div\u003e\n\u003cdiv style=\"flex:1; padding:9px 14px; font-size:14px; color:#222222;\"\u003eA\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#008377CF; color:#FFFFFF; font-weight:700; font-size:13.5px; letter-spacing:.04em; text-transform:uppercase; padding:9px 14px; border-radius:6px 6px 0 0; margin-top:14px;\"\u003eDimensions \u0026amp; Connections\u003c\/div\u003e\n\u003cdiv style=\"border:1px solid #D9EDEA; border-top:none; border-radius:0 0 6px 6px; overflow:hidden; margin-bottom:6px;\"\u003e\n\u003cdiv style=\"display:flex; background:#FFFFFF; border-bottom:1px solid #D9EDEA;\"\u003e\n\u003cdiv style=\"flex:0 0 46%; padding:9px 14px; font-weight:600; font-size:14px; color:#333333;\"\u003eHeight\u003c\/div\u003e\n\u003cdiv style=\"flex:1; padding:9px 14px; font-size:14px; color:#222222;\"\u003e600mm\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; background:#F7FAFA; border-bottom:1px solid #D9EDEA;\"\u003e\n\u003cdiv style=\"flex:0 0 46%; padding:9px 14px; font-weight:600; font-size:14px; color:#333333;\"\u003eWidth\u003c\/div\u003e\n\u003cdiv style=\"flex:1; padding:9px 14px; font-size:14px; color:#222222;\"\u003e375mm\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; background:#FFFFFF; border-bottom:1px solid #D9EDEA;\"\u003e\n\u003cdiv style=\"flex:0 0 46%; padding:9px 14px; font-weight:600; font-size:14px; color:#333333;\"\u003eDepth\u003c\/div\u003e\n\u003cdiv style=\"flex:1; padding:9px 14px; font-size:14px; color:#222222;\"\u003e285mm\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; background:#F7FAFA; border-bottom:1px solid #D9EDEA;\"\u003e\n\u003cdiv style=\"flex:0 0 46%; padding:9px 14px; font-weight:600; font-size:14px; color:#333333;\"\u003eWeight\u003c\/div\u003e\n\u003cdiv style=\"flex:1; padding:9px 14px; font-size:14px; color:#222222;\"\u003e23kg\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; background:#FFFFFF; border-bottom:1px solid #D9EDEA;\"\u003e\n\u003cdiv style=\"flex:0 0 46%; padding:9px 14px; font-weight:600; font-size:14px; color:#333333;\"\u003eFlue gas connection\u003c\/div\u003e\n\u003cdiv style=\"flex:1; padding:9px 14px; font-size:14px; color:#222222;\"\u003e60mm\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; background:#F7FAFA; border-bottom:1px solid #D9EDEA;\"\u003e\n\u003cdiv style=\"flex:0 0 46%; padding:9px 14px; font-weight:600; font-size:14px; color:#333333;\"\u003eVentilation air connection\u003c\/div\u003e\n\u003cdiv style=\"flex:1; padding:9px 14px; font-size:14px; color:#222222;\"\u003e100mm\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"background:#008377CF; color:#FFFFFF; font-weight:700; font-size:13.5px; letter-spacing:.04em; text-transform:uppercase; padding:9px 14px; border-radius:6px 6px 0 0; margin-top:14px;\"\u003eStandard Delivery\u003c\/div\u003e\n\u003cdiv style=\"border:1px solid #D9EDEA; border-top:none; border-radius:0 0 6px 6px; overflow:hidden; margin-bottom:6px;\"\u003e\n\u003cdiv style=\"display:flex; background:#FFFFFF; border-bottom:1px solid #D9EDEA;\"\u003e\n\u003cdiv style=\"flex:0 0 46%; padding:9px 14px; font-weight:600; font-size:14px; color:#333333;\"\u003eBurner\u003c\/div\u003e\n\u003cdiv style=\"flex:1; padding:9px 14px; font-size:14px; color:#222222;\"\u003eModulating and fan-assisted MatriX-Plus burner\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; background:#F7FAFA; border-bottom:1px solid #D9EDEA;\"\u003e\n\u003cdiv style=\"flex:0 0 46%; padding:9px 14px; font-weight:600; font-size:14px; color:#333333;\"\u003eControl\u003c\/div\u003e\n\u003cdiv style=\"flex:1; padding:9px 14px; font-size:14px; color:#222222;\"\u003eConstant temperature and weather-compensated control unit\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; background:#FFFFFF; border-bottom:1px solid #D9EDEA;\"\u003e\n\u003cdiv style=\"flex:0 0 46%; padding:9px 14px; font-weight:600; font-size:14px; color:#333333;\"\u003eGas isolation\u003c\/div\u003e\n\u003cdiv style=\"flex:1; padding:9px 14px; font-size:14px; color:#222222;\"\u003eGas shut-off valve included\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"display:flex; background:#F7FAFA; border-bottom:1px solid #D9EDEA;\"\u003e\n\u003cdiv style=\"flex:0 0 46%; padding:9px 14px; font-weight:600; font-size:14px; color:#333333;\"\u003eMounting\u003c\/div\u003e\n\u003cdiv style=\"flex:1; padding:9px 14px; font-size:14px; color:#222222;\"\u003eWall mounting bracket, fully plumbed and wired\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdetails style=\"border:1px solid #D9EDEA; border-radius:6px; margin-bottom:8px; overflow:hidden;\"\u003e\u003csummary style=\"padding:13px 16px; font-size:15px; font-weight:700; color:#00625D; cursor:pointer; list-style:none; display:flex; align-items:center; justify-content:space-between; background:#E6F4F3;\"\u003e\u003cspan\u003eWhat does 'heat only' mean for this boiler?\u003c\/span\u003e\u003csvg width=\"16\" height=\"16\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#008377CF\" stroke-width=\"2.5\"\u003e\u003cpolyline points=\"6 9 12 15 18 9\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e\u003c\/summary\u003e\u003cdiv style=\"padding:13px 16px 15px 16px; font-size:14.5px; color:#3A3A3A; line-height:1.6; border-top:1px solid #D9EDEA; background:#FFFFFF;\"\u003eA heat-only (regular) boiler provides central heating output alone — it does not generate hot water directly and relies on an existing separate hot water cylinder for DHW.\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #D9EDEA; border-radius:6px; margin-bottom:8px; overflow:hidden;\"\u003e\u003csummary style=\"padding:13px 16px; font-size:15px; font-weight:700; color:#00625D; cursor:pointer; list-style:none; display:flex; align-items:center; justify-content:space-between; background:#E6F4F3;\"\u003e\u003cspan\u003eHow does the 25kW compare to the 32kW heat-only model?\u003c\/span\u003e\u003csvg width=\"16\" height=\"16\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#008377CF\" stroke-width=\"2.5\"\u003e\u003cpolyline points=\"6 9 12 15 18 9\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e\u003c\/summary\u003e\u003cdiv style=\"padding:13px 16px 15px 16px; font-size:14.5px; color:#3A3A3A; line-height:1.6; border-top:1px solid #D9EDEA; background:#FFFFFF;\"\u003eBoth share the same control platform and heat exchanger technology; the 25kW model is slightly slimmer at 285mm deep versus 340mm on the 32kW, and delivers a lower maximum heat output suited to smaller heating circuits.\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #D9EDEA; border-radius:6px; margin-bottom:8px; overflow:hidden;\"\u003e\u003csummary style=\"padding:13px 16px; font-size:15px; font-weight:700; color:#00625D; cursor:pointer; list-style:none; display:flex; align-items:center; justify-content:space-between; background:#E6F4F3;\"\u003e\u003cspan\u003eIs a WiFi modem included as standard?\u003c\/span\u003e\u003csvg width=\"16\" height=\"16\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#008377CF\" stroke-width=\"2.5\"\u003e\u003cpolyline points=\"6 9 12 15 18 9\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e\u003c\/summary\u003e\u003cdiv style=\"padding:13px 16px 15px 16px; font-size:14.5px; color:#3A3A3A; line-height:1.6; border-top:1px solid #D9EDEA; background:#FFFFFF;\"\u003eNo, WiFi\/ViCare app connectivity requires an optional modem accessory on this heat-only model.\u003c\/div\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #D9EDEA; border-radius:6px; margin-bottom:8px; overflow:hidden;\"\u003e\u003csummary style=\"padding:13px 16px; font-size:15px; font-weight:700; color:#00625D; cursor:pointer; list-style:none; display:flex; align-items:center; justify-content:space-between; background:#E6F4F3;\"\u003e\u003cspan\u003eWill this boiler work with my existing open vented system?\u003c\/span\u003e\u003csvg width=\"16\" height=\"16\" viewbox=\"0 0 24 24\" fill=\"none\" stroke=\"#008377CF\" stroke-width=\"2.5\"\u003e\u003cpolyline points=\"6 9 12 15 18 9\"\u003e\u003c\/polyline\u003e\u003c\/svg\u003e\u003c\/summary\u003e\u003cdiv style=\"padding:13px 16px 15px 16px; font-size:14.5px; color:#3A3A3A; line-height:1.6; border-top:1px solid #D9EDEA; background:#FFFFFF;\"\u003eYes, the Vitodens 100-W B1GA is designed to be compatible with existing open vented or sealed heating systems and any compatible cylinder type, except solar-fed cylinders.\u003c\/div\u003e\u003c\/details\u003e\n\u003c\/div\u003e","brand":"Viessmann","offers":[{"title":"Default Title","offer_id":65942129344861,"sku":"7098664","price":1670.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/ViessmannVitodens100-W25kWB1GAHeatOnlyBoiler.jpg?v=1789625065","url":"https:\/\/qualityheating.co.uk\/products\/viessmann-vitodens-100-w-25kw-b1ga-heat-only-boiler-7098664","provider":"AIZO Quality Heating","version":"1.0","type":"link"}