| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a heater capable of smoothly supplying hot water without caring about the shortage of hot water by automatically storing hot water necessary for supplying the hot water in a hot water storage tank until the supply of hot water is started even when a large amount of hot water is used. SOLUTION: When the quantity of heat Qz of remaining hot water becomes the quantity of heat Qf necessary for supplying hot water or lower (step S13), if current time counted by a clock counter 201 becomes boiling time, the supply of electric current to the upper heater 34 is started (step S17). The upper heater 34 is energized (step S18) until the detected temperature of a third tank temperature sensor 39 reaches target boiling-up temperature Tsj to ensure the insufficient quantity of heat Qyf for supplying hot water immediately before the start of supply of hot water. Thus, the hot water can be smoothly supplied without caring about the shortage of hot water.</p> |
