| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem wherein a hot-water supply compound system such as a hot-water supply heating bath system gets large and a problem of hot-water temperature control performance and a running cost in heating and reheating for a bath, in a combustion device. SOLUTION: A pressure pump 20 as a conveying means is provided in the first circulation circuit 19 for circulating hot water, the first double tube heat-exchanger 23 is provided as a forced convection type heat exchanger for the heating, in an upstream, and the second double tube heat-exchanger 24 is provided as a forced convection type heat exchanger for the reheating for the bath, in a downstream. The system is thereby downsized remarkably since the pressure pump 20 is reduced in its size and since the first and second double tube heat-exchangers 23, 24 are also able to be downsized, because a route of the first circulation circuit 19 is able to be shortened. A heat loss is also restrained when circulating a high temperature of hot water, so as to realize the low running cost as its effect. COPYRIGHT: (C)2005,JPO&NCIPI
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