PROBLEM TO BE SOLVED: To reduce the volume of a mixture gas chamber for miniaturization of an apparatus, and ensure complete combustion by ensuring mixture gas with good conditions. ;SOLUTION: Second mixture gas chamber 3L and 3R are provided in a crane wing shape from left and right opposite ends of a first mixture gas chamber 3, and for each chamber combustion plates 4.4L.4R are provided, and further a fan 1 is mounted on the back side of the first mixture gas chamber 3. Air taken in from an air suction inlet 1A is supplied to the first mixture gas chamber 3 through an orifice 1B. Further, a fuel supply hole 2A is opened in the circumference of a first mixture gas chamber 3 side opening end of the orifice 1B, which opening is connected with a fuel gas supply pipe 2.;COPYRIGHT: (C)1998,JPO
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