| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent run-out of hot water while reducing time required for increasing a temperature of bathtub water up to a set temperature when performing a hot water supply operation from a state with hot water in a bathtub. <P>SOLUTION: A storage type water heater 1 can perform a boiling-up operation, a hot water supply operation for supplying hot water of a set temperature and a set amount in a bathtub 2, and a reheating operation in which a bath circulation heat source pump 20 installed on the way of a tank circulation circuit 18 is operated and hot water in a hot water storage tank 4 and hot water in a bathtub 2 are subjected to mutual heat exchange. When performing a hot water supply operation with water, the reheating operation is performed for heating bathtub water and then hot water in the hot water storage tank 4 is supplied to the bathtub 2 until hot water in the bathtub 2 reaches a set temperature and a set amount. When the storage of heat in the hot water storage tank 4 is larger than a predetermined amount at the time of the reheating operation, the pump 20 is controlled at a predetermined rotation speed for the reheating operation. When the storage of heat is equal to or smaller than a predetermined amount, the pump 20 is controlled at a rotation speed lower than the predetermined rotation speed for the boiling-up operation as well as reheating operation. <P>COPYRIGHT: (C)2013,JPO&INPIT |
