This case study provides details of a domestic scale biomass boiler in a low energy building used for educational visits, training and conferences. Wills Barn, which is owned by Yeo Valley Organic, is a 250 year old limestone building that was renovated between 2006 and 2008. It is not connected to the national grid or serviced with mains gas. Instead the building is energy self sufficient, with all the heating provided by a 22 kW Idro Extraflame Italian wood pellet stove with back boiler installed by Devon based Wood Energy Ltd. This case study was produced on behalf of Mendip Hills Area of Outstanding Natural Beauty.