| 摘要 |
PROBLEM TO BE SOLVED: To suppress wasting of water by preventing hot water whose temperature is much lower than set temperature from hot water supply destination.SOLUTION: Hot water is generated by hot water supply heat exchangers 4 and 6 in a heat source unit 2, and is supplied to one or more hot water supply destinations through a hot water supply path 9. A tip end side of a connection path 36 connected, through the header 24, to a position on a hot water supply side of the hot water supply path 9 installed outside from the heat source unit 2, is connected to a reheating circulation path 15 connected to a bath tub 14 through switching valves 62 and 63. There is provided a sacrificial water guiding-out control means by which, upon receiving sacrificial water supply preventing command for preventing supplying of sacrificial water, from a hot water supply destination, whose temperature is lower than a set temperature for hot water supply by exceeding a predetermined tolerable range, with the sacrificial water held in the hot water supply path 9 running from the heat source unit 2 to the header 24, the sacrificial water is guided-out to a bath tub 14 from the hot water supply path 9 through the connection path 36, the switching valves 62 and 63, and the reheating circulation path 15, and upon receiving a guiding-out stop command of the sacrificial water to the bath tub 14, guiding-out of water from the hot water supply path 9 to the bath tub 14 is stopped. |
