HETAS are the official body recognised by the Government to approve biomass and solid fuel domestic heating appliances, fuels and services including the registration of competent installers such as McDermott Renewables. HETAS is the only government approved competent persons scheme specialising in solid fuel, wood & biomass. All registered installers are trained and regularly assessed as competent. The HETAS scheme covers a range of installations that an installer may carry out: dry appliances, appliances with boilers, solid mineral, wood & biomass appliances, hot water and heating systems along with re-lining chimneys. HETAS is the official body for testing and approval of appliances and publishes lists of approved appliances, fuels and equipment to help consumers choose the correct heating system for their property.