This standard specifies the terms and definitions, classification and parameter, material, construction and safety requirements, operational requirements, test methods, inspection rules, marking, cautions and instructions, packing, transport and storage of gas-fired heating and hot water combi-boilers of closed combustion (hereinafter referred to as "boiler").
This standard is applicable to the combination boilers for heating and hot water, with nominal heat input not exceeding 70kW, maximum heating operating water pressure not exceeding 0.3MPa, operating water temperature not greater than 95℃, adopting atmospheric burner or fan assisted burner or full premix burner, also to single heating boilers.
This standard is not applicable to the following boilers:
——Natural draught flue type and outdoor boilers;
——Condensing boilers;
——Volumetric boilers;
——Boilers adopting two sets of independent combustion systems respectively for heating and hot water in the same enclosure, including the boilers with common duct.
