In the decades since the wall-hung furnace was born and entered the commodity era, various types of wall-hung furnaces have emerged in the HVAC product markets of various countries including China. The types of these boilers are roughly as follows:
1. According to the heating method, it can be divided into instant heating boiler and volumetric boiler;
2. According to usage, it can be divided into single-function and heating and bathing dual-use types, of which heating and bathing dual-use type can be divided into casing-type wall-hung boilers and plate-changing wall-hung boilers;
3. According to the characteristics of the gas valve body, it can be divided into on-off type wall-hung boiler and proportional wall-hung boiler;
4. According to the pressure characteristics of the combustion chamber, it can be divided into positive pressure combustion type wall-hung furnace and negative pressure combustion type wall-hung furnace;
5. From the form of heat exchanger, it can be divided into internal combustion wall-hung boiler and external combustion wall-hung boiler;
6. According to the characteristics of the circulation system, it can be divided into open wall furnace and closed wall furnace;
7. According to the characteristics of whether waste heat can be recovered, it can be divided into ordinary wall-hung boilers and condensing wall-hung boilers.