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See Chinese contents: GB 20665-2015 GB 20665-2015: Minimum allowable values of energy efficiency and energy efficiency grades for domestic gas instantaneous water heaters and gas fired heating and hot water combi-boilers
This Standard specifies the minimum allowable values of energy efficiency, energyconservation evaluating value, energy efficiency grades, test methods and inspection rules for domestic gas instantaneous water heater (including condensing domestic gas instantaneous water heate), and gas fired heating and hot water combi-boilers. This Standard is applicable to the water heater and heating furnace with gas as the only energy and heat load no greater than 70kW.
