Heat Only Boilers

The Viessmann Vitodens 100-W B1GA 25kW Heat Gas Boiler is a condensing heat only boiler for medium to large homes with up to 15 radiators, requiring a hot water cylinder and feed/expansion tank. It provides a 25kW central heating output and a 94% seasonal efficiency rating (ErP A-rated). Measuring 700x400x350mm and weighing 33kg, it fits in a cupboard with no side clearance. It features the Inox-Radial stainless steel heat exchanger, a MatriX-Plus burner with Lambda Pro Control (natural gas, LPG, or 20% hydrogen blends), and an LCD touchscreen for intuitive control. Quiet Mark approved, it supports flexible flueing, weather compensation, and OpenTherm compatibility. It offers a 10-year warranty, extendable to 12 years with a Viessmann-accredited installer, suitable for homes with higher heating demands.

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