Domestic gas fired central heating/hot water boilers and circulators, combination boilers, storage water heaters and instantaneous water heaters of heat input ≤ 70 kW net.
Open flue and balanced-flue (natural-draught and fan -assisted) for all appliance types and flueless instantaneous water heaters
including: Stirling engine micro-generation appliances. Appliances designed to be installed to BS 6798 that are providing
heating to swimming pools by means of an indirect heat exchanger.