| 摘要 |
PROBLEM TO BE SOLVED: To prevent residual water in a heat transfer pipe from being boiled in single operation. SOLUTION: In the one-can two-circuit type heat source device, a dual-purpose combustion part 28 is provided while being sandwiched between a first combustion part 29 and a second combustion part 30, a first heat transfer pipe 32 is provided at each downstream side of the double-purpose combustion part 28 and the first combustion part 29 through a can body 21, and similarly a second heat transfer pipe 33 is provided at each downstream side of the double- purpose combustion part 28 and the second combustion part 30 through the can body 21. In a heat reception fin 24, a surface area near the first and second heat transfer pipes 22 and 23 that are provided in contact each other is reduced. Then, when the second combustion part is operated separately, residual water in the first heat transfer pipe 32A suppresses the scale clogging of the first heat transfer pipe 22 due to the suppression of the amount of received heat and the radiation to the first heat transfer pipe 22A where water passes and reduces combustion load by the amount where the double-purpose combustion part 28 is burnt and hence also reduces noise.
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