| 摘要 |
<p>PURPOSE:To enable automatic variation of a boiling-up set temperature, by a method wherein, when water fed through a water feed piping is heated and hot water is fed through a hot water piping, a lower-most detecting value of temperatures under a water feed state detected at intervals of a given time is outputted as a representative hot water temperature. CONSTITUTION:In a hot water feeding device, the temperature of a water feed piping 33 or the internal temperature thereof is detected by a feed water temperature state detecting means 38. During a time except a water feed time, the device is brought into a state in which water stays in the water feed piping 33. Under the staying state, temperature escaping from a water flow state resulting from heat exchange with ambient atmosphere is detected. In this case, an interval of a given time, for example, a period of 24hr, is determined, and a lowermost detecting value during the period is outputted as a representative hot water temperature value by a water temperature deciding means 51. Thus, when a detecting spot by the feed water temperature state detecting means 38 is a place, e.g. the interior of a building, where an ambient atmosphere temperature is maintained at a value higher than a flow water temperature, the representative water temperature detects a minimum flow water temperature value at each day. This constitution enables facilitation of automatic variation of a boiling-up set temperature.</p> |
