| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an automatic hot water filling for a bathtub capable of saving the cost of keeping warm by utilizing midnight power also for keeping warm the bath water in the bathtub. SOLUTION: The predetermined amount of bath water is drained by opening a motor-operated valve 12, opening a three-way valve 60 towards a draining pipe 61 and driving a circulation pump 11 when the temperature of bathwater in the bathtub is lower than a set up temperature. Then, the same amount of hot water with the amount of the drained hot water which is the mixture of high temperature hot water in a hot water storage tank 30 heated by the midnight power and city water by a temperature control valve 34 is fed into the bathtub by switching the three-way valve towards a circulation circuit 10, stopping the circulation pump 11 and opening a solenoid valve 22. Therefore, the cost of keeping warm the bathwater can be saved by keeping warm the bathwater in the bathtub 1 by feeding the hot water heated by utilizing the midnight power compared to keeping warm the bathwater by energizing an electric heater.</p> |
