The Druid 12kw multi-fuel boiler is the middle child of the Druid family range. It is capable of heating up to 6 radiators. The Druid range starts at 5kw and increases all the way to a 30kw boiler. It is constructed of high-grade steel with a heavy cast iron door. It also has a double combustion system and cool to touch handle. It boasts an efficiency of 78%.