| 摘要 |
Hot water boiler body(3) established compatibly by fuel tank body(2) was characterized by having the inner and the outer bending pipe. The inner bending pipe(20) which is equipped with between hot boiler body and fuel tank body, extending to the upside of combuster(5) out of lateral wall of boiler body, shapes the passageway of combustion gas. And passage way of second air is formed between inner and outer bending pipes.
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