| 摘要 |
PROBLEM TO BE SOLVED: To appropriately control a hot water supply temperature when using bathtub water containing air bubbles in a configuration having an air bubble supply function to a bathtub and a bathtub water reheating function.SOLUTION: A hot water storage water heater includes a use-side heat exchanger 22, a bathtub 50, a bathtub water circulation circuit 51, a bathtub water circulation pump 54, a water flow sensor 55 and a microbubble generating device 80. In a state where a bather selects air bubble bathing, when the bathtub water circulation pump is operated but a water flow is not detected, the amount of the bathtub water is small. Therefore, reheating by the use-side heat exchanger is not executed and the microbubble generating device is operated, so as to prevent supply of overheated high-temperature water into the bathtub during next hot water supply. On the other hand, when a water flow by operation of the bathtub water circulation pump is detected, the sufficient amount of bathtub water is present. Therefore, reheating is executed while air bubbles are generated, so as to prevent lowering of temperature of the bathtub water caused by inclusion of the air bubbles. |
