PURPOSE: To eliminate the need for a blower which consumes a large quantity of electric power, by installing a burner to the tip of a fuel gas pipe so as to freely rotate, forming flame ports on said burner so as to eject combustion gas in a peripheral direction and obtain rotary force, and providing a discharge impellers made in one piece with said burner.

CONSTITUTION: Air discharge impellers 6 are made in one piece with a burner 4. Therefore, when said burner 4 is rotated, said air discharge impellers 6 are rotated similarly. When the air discharge impellers 6 are rotated in an opposite direction to an ejection direction of combustion gas from flame ports 5, it is contrived that the air flow from an air blow pipe 2 should be directed at an opening 7b on the lower stream side of the air blow pipe 2, thereby forming an air stream which is directed from an opening 7a on the upper stream side to the opening 7b on the lower stream side. Therefore, the rotation of the air discharge impellers 6 blows out combustion air smoothly into the air blow pipe 2 from the opening 7a on the upper stream side, which generates high temperature combustion in the air blow pipe 2 as a result and ejects hot air from the opening 7b on the lower stream side of the air blow pipe 2. It is, therefore, possible to use the ejected hot air for drying and heating service.