Abstract: A cooking appliance using a gas fuel as a heat source and having an appliance body includes comprising a temperature sensor installed in a heating chamber, a control circuit adapted to be actuated by the output from the temperature sensor and to operate according to three working temperatures, namely, a preset temperature, an upper limit temperature and a lower limit temperature, the arrangement being such that when the temperature in the heating chamber being detected by the temperature sensor reaches the upper limit temperature, the main burners are completely closed; when it reaches the preset temperature, the firing of the main burners is reduced by half; and when it reaches the lower limit temperature, the main burners are fully opened, thereby effecting fine temperature control, the firing rate being automatically adjusted according to variations in external conditions affecting the heating chamber temperature, thereby maintaining the preset temperature throughout the heating operation to provide a sati

Abstract: A conventional gas oven having exhaust holes in the high air pressure region of a heating chamber has a drawback that when a circulation fan is rotating, hot air is constantly discharged to cause a great heat loss. According to the present invention, exhaust holes are provided in or adjacent a region where the pressure becomes negative owing to the suction of a circulation fan when the gas combustion is off, with the result that there is no possibility of hot air being unnecessarily discharged in the gas combustion-off period and that in the gas combustion-on period the amount of discharge is automatically controlled according to the combustion rate. Thus, the invention is characterized by quick temperature rise and the saving of energy, consuming less fuel.