The Aarrow Stratford Eco Boiler 25 High Efficiency Multi-fuel / Wood-burning Boiler Stove is the largest model in the range, it has been designed specifically for its role as a boiler stove and stands head and shoulders above the competition. With high performance, efficiency and ease of use in mind the the Aarrow Eco Boiler 25 is a truly economical and reliable alternative to the more traditional central heating system. The Eco boiler range are a sustainable option as well as an attractive and stylish focal point for any living area. The Stratford Eco Boiler 25 gives 3.5-12kW output to room, 25kW (85,350Btu) to water which heats around 15-17* single radiators