According to their different properties, with a variety of classification methods. According to fuel, fuel burning machine, gas burner and dual fuel burner, as well as biomass burning machine. Including: in the specific application, the fuel burner will divide the for light oil burning machine, heavy oil combustion machine; gas burner, gas burner, city gas burner. According to the combustion control method of combustion machine: single stage fire engine, double section of fire burning machine, proportional regulating unit.