PURPOSE: To make the efficiency of a fan better by increasing the temperature difference of a thermo-electric element by a method in which a part to be heated at the tip of a thermo-electric generation element is positioned in the burning part, a cooling part at the basal end of the element is supported by one end of a radiator, and the other end is positioned in the low-temperature region of the outside.

CONSTITUTION: When combustion is started, the part to be heated 18... of thermo-electric generation elements 14... are heated, and the difference in temperature between the part to be heated 18 and the parts to be cooled brings about a thermoelectromotive force, by which a motor 23 is actuated to turn a fan 6. The parts to be cooled 19 in the elements 14 are supported by one end of a radiator 12 of the other end of which is introduced from the back side outside or low-temperature region of the stove 1, and therefore, heat in the parts to be cooled 19 is dissipated through the radiator 12, the temperature rise of the parts to be cooled 19 is suppressed, and a great temperature difference is produced between the parts to be heated 18 and the parts to be cooled 19 to generate a great electromotive force by which the fan 6 is effectively driven.