Guide: There are four levels of boilers, namely: Class A boiler, Class B boiler, Class C boiler, Class D boiler. The classification standards according to the manufacturing license level are as follows: ①A-level boiler manufacturer Boiler manufacturing scope: unlimited

　　There are four levels of boilers, namely: Class A boiler, Class B boiler, Class C boiler, and Class D boiler.

　　According to the manufacturing license level classification standards are as follows:

　　①A-level boiler manufacturer Boiler manufacturing scope: unlimited, the highest level of boiler manufacturing license.

　　②Class B boiler manufacturers The boiler manufacturing license level is lower than that of Class A boiler manufacturers. The scope of boiler manufacturing: steam boilers (gauge pressure) with a rated steam pressure less than or equal to 2.5MPa.

　　③The boiler manufacturing license level of C-grade boiler manufacturers is lower than that of B-grade boiler manufacturers. The scope of boiler manufacturing: steam boilers with rated steam pressure less than or equal to 0.8MPa and rated evaporation less than or equal to 1t/h; hot water with rated outlet temperature less than 120℃ Boiler (gauge pressure).

　　④Boiler manufacturing license level for Class D boiler manufacturers is lower than Class C boiler manufacturers. Boiler manufacturing scope: steam boilers with rated steam pressure less than or equal to 0.1MPa; hot water boilers with rated outlet temperature less than 120℃ and rated thermal power less than or equal to 2.8MW (Gauge).