In the first frame of the fuel through the combustion temperature. Through the heat exchanger to heat the air through the heat exchanger after the air temperature drops below 250 degrees Celsius, and then discharged. Heating of the air blowing fan for distribution to the stove, the air absorbs the heat to the nominal value, will be hot air from the exhaust vent. When the air temperature limit is reached when the burner can be stopped or turned into a small fire. When the air temperature down to the rated limit, when the burner is automatically turned to the fire.