GB 24500-2020

This standard specifies the minimum allowable energy efficiency values and energy efficiency grades for industrial boilers, covering both steam and hot water boilers used in industrial production and heating applications. It applies to the design, manufacturing, and procurement of boilers with a rated capacity between 0.5 t/h and 35 t/h for steam boilers or 0.35 MW and 24.5 MW for hot water boilers, ensuring compliance with national energy conservation regulations. The standard is used by manufacturers, testing laboratories, and regulatory bodies to classify boiler efficiency into grades 1, 2, and 3, with grade 3 representing the mandatory minimum threshold for market access.