PURPOSE: To provide a heating apparatus capable of operating a pump for circulating heating medium without using a commercial power, by providing a thermoelectric generator which generates an electromotive force with a temperature difference caused by the heat of a heat source.
CONSTITUTION: When a heat source 1 is heated, heat-collecting fins 15 are heated by radiant heat from a heat source 1 or a stream of high-temperature vapor from a flame. Heat transferred to the heat-collecting fins 15 is given to semiconductor elements 10a, 10b through an electric insulating layer 14 and an electrode plate 12. In such a way, a positive electromotive force is generated on the higher temperature side of N-type semiconductor elements 10a and negative electromotive force on the lower temperature side thereof, whereas electromotive forces reverse to those on said elements 10a are generated on P-type semiconductor elements 10b, so that total electromotive force generated in both the semiconductor elements 10a, 10b connected in series occurs between lead wires 13. Electromotive force taken out of the lead wires 13 is applied to a heating medium circulating pump 3 as an electric source for driving, so that heating medium 7 is circulated. Said heating medium 7 is heated in a heat exchanger 4 by the heat of the heat source 1 transferred through a thermoelectric generator 2 and is supplied to a radiating member 6 through a heating medium circulating pipe 5.