| 摘要 |
PROBLEM TO BE SOLVED: To effectively use heat collected by a heat collector.SOLUTION: Heat of sunlight is collected by a heat collector, and a temperature of liquid in which the heat is collected is detected by heat collector interior liquid temperature detection means 5. A liquid circulation passage connected to the heat collector 1 is thermally connected to a hot water storage tank and a hot water circulation passage. Water filling to a bathtub is performed at designated timing, and then, after a detection temperature obtained by the heat collector interior liquid temperature detection means 5 is determined to be a prescribed heat collection using bathtub water heating set temperature or higher and inside of the hot water storage tank 2 is determined to be filled with hot water having a prescribed full storage determination set temperature or higher, heat collection using bathtub water heating control means drives a liquid circulation pump 4 in the liquid circulation passage to circulate liquid within the liquid circulation passage, and drives a bathtub hot water circulation pump 8 to circulate bathtub hot water within the hot water circulation passage. By performing heat exchange between the liquid passing within the liquid circulation passage and the bathtub hot water passing within the hot water circulation passage, water in the bathtub is heated by using the heat collected by the heat collector. |
