| 摘要 |
PROBLEM TO BE SOLVED: To eliminate the temperature rise of hot water of a circulating channel for reheating of a bathtub water by heat exchange with warm water circulation channel and to supply hot water of suitable temperature to the bathtub by stopping the circulation of the warm water of the channel in the case of supplying hot water or water to the bathtub when the warm water is circulated through the channel. SOLUTION: A heat exchanger 32 for reheating bathtub water is provided at a circulation channel 41 for reheating bathtub water. The channel 41 has a bath return tube 42 from the bathtub 11 to the exchanger 32 and a bath forward tube 43 from the exchanger 32 to the bathtub 11. A circulating pump 44 for the bath to circulate the hot water of the bathtub 11 via the channel 41 is installed at the tube 42. At the time of supplying hot water or water to the bathtub 11 during low temperature heating operation, a burner 23 for heating and a circulating pump 31 for heating are stopped until a thermal valve 38 for heating is closed. Thus, it can prevent the rising of the temperature of the hot water to the bathtub 11 by the heat exchange of the heat exchanger 32 for reheating the bathtub water. |
