| 摘要 |
PURPOSE:To make it possible to shorten the time of additional burning to a great extent and automatically lower the temperature of the hot water in a bath tub by adding hot water even if the temperature of the residual hot water in the bath tub is high by controlling the combustion of a burner for the supply hot water in a supply hot water circuit according to the hot water temperature in a bath tub and adjusting the temperature of the supply hot water. CONSTITUTION:If, during a bath tub 1 is being filled or replenished with water, the water level in the bath tub 1 is over a certain level, the water in the bath tub 1 is circulated into an additional burning circuit 4 with a certain interval of time. During this water circulation the hot water temperature is detected by a hot water temperature sensor 6 provided in the additional burning circuit 4 and a sensed temperature is compared with a set temperature for the finish of water heating. If a detected temperature is lower than the set temperature by a set temperature, the temperature of the hot water from a supply hot water circuit 2 is raised through control means 8, and when a detected temperature is higher than the set temperature for the finish of water heating, the temperature of the supply hot water is lowered. When the amount of hot water reached a specified amount and a water level sensor 5 is activated, a circulation pump 7 is started, and the temperature of the hot water and the set temperature are compared. If the hot water temperature is lower, a burner 9 for additional burning is activated. If the hot water temperature is equal or higher than the set temperature, the burner 9 for additional burning and the circulation pump 7 stop. |
