| 摘要 |
<p>PURPOSE:To keep a required amount of hot water having a temperature corresponding to the purpose of use in the vicinity of a hot water feeding location by a method wherein each of hot water storing tanks is disposed near a plurality of locations requiring hot water feeding and the temperature of water in each of the hot water storing tanks is increased up to a set temperature through an electrical heater. CONSTITUTION:A control device 6 drives an electrical heater 4 and a pump 5 in a time zone of a mid-night electrical fee (from 11PM to 7AM). In this operation, water in a hot water storing tank 1 is guided to an electrical hot water heater 4 through a return pipe 8 and then the water is heated. The hot water after heating flows again into the hot water storing tank 1 through a going pipe 7. Temperature of water in the hot water storing tank 1 is increased during this repetition of circulation and reaches its set temperature (a boiling-up temperature). Water in each of the hot water storing tanks 2, 3 is also heated through its similar circulation and operations of the electrical heater 4 and the pump 5 are stopped at the time when the reaching of each of the water temperatures in all the hot water storing tanks 1, 2 and 3 to their boiling-up temperature is confirmed in response to outputs of sensors 11, 21 and 31.</p> |
