| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat source machine for hot-water heating of an one-can and two kinds of water type unaffecting the hot-water supply characteristic of a hot water supply piping system even while only a heating system is in operation. SOLUTION: The heat source machine 1 for hot-water heating supplies heat to a hot water supply system 3 and a heating system 5 using the same combustion part 9 and the same heat exchanger 11, and supplies heat to a bath water reheating system 7 using a water-water heat exchanger 49. A temperature sensor 23 is provided in a hot/cold water supply pipe 19 near the heat exchanger 11. During heating operation, ON-OFF combustion or proportional combustion is effected in the combustion part 9 in such a way that the temperature of water in the hot/cold water supply pipe 19, detected by the temperature sensor 23, does not exceed a predetermined threshold, to avoid a sudden rise in the temperature within the hot water supply system 3 and a change in water pressure.
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