| 摘要 |
PROBLEM TO BE SOLVED: To reduce wasteful use of thermal energy in a reheating operation of bathtub hot water.SOLUTION: An air-heating liquid circulation passage to circulate a liquid in a heating device is thermally connected to a reheating circulation passage connected to a bathtub, liquid in the air-heating liquid circulation passage is circulated while heated by a heat exchanger for air heating, also the bathtub hot water is circulated through the reheating circulation passage, and thus reheating operation of the bathtub hot water is performed. Upon reheating the bathtub hot water during an operation of a low-temperature liquid circulation mode in which the liquid to be heated by the heat exchanger for air heating is circulated at a low setting temperature, a reheating liquid circulation mode control means 64 controls reheating of the bathtub hot water while continuing the low-temperature liquid circulation mode; and upon reheating the bathtub hot water during an operation other than the functions of the low-temperature liquid circulation mode, the control means controls reheating of the bathtub hot water in a high-temperature liquid circulation mode in which the liquid is heated to a high setting temperature that is higher than the low setting temperature, and circulated. |
