| 摘要 |
PROBLEM TO BE SOLVED: To accurately compute a remaining water amount through computing a quantity of heat, in a one-drum two-water passage system bath hot water supplying device to have a function to compute a remaining water quantity through a quantity of heat computing system. SOLUTION: In a controller 31 of a bath hot water supply device 1, a table is provided to indicate a relation between the temperature of hot water in a bath tub detected by a bath tub hot water temperature detecting sensor 21, the temperature of hot water in the water wall of a heat-exchanger 2 for hot water supply detected by a drum body thermistor 9, and bath capacity. When operation to compute a quantity of heat is started, the temperature of hot water in a bath tub during starting is detected, and the temperature of hot water in a bath tub and the temperature of hot water in the water wall are also detected during completion. Bath capacity during starting and bath capacity during completion are determined according to the respective hot water temperatures, and a remaining water amount is determined through computation of a quantity of heat by using an average value of two kinds of bath capacity.
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