| 摘要 |
PROBLEM TO BE SOLVED: To stabilize a hot water supply temperature during an initial reheating operation for reheating hot water supplied from a hot water storage tank at a time of hot water supply cold start time or the like.SOLUTION: A heat source device controls a flow volume of hot water flowing from a hot water outflow path of the hot water storage tank to a joint portion and a flow volume of water flowing from a water supply path to the joint portion so as to produce mixture hot water at a mixture set temperature. During the initial reheating operation for reheating the mixture hot water by a water heater at a time of the hot water supply cold start time or the like, mixture set temperature setting means 36 sets a mixture set temperature so that the temperature of the mixture hot water when a set period passes since the start of supplying the hot water is increased at a preset first set temperature gradient to be lower than a minimum combustion-class number inflow temperature necessary to produce the hot water at the temperature set corresponding to the minimum combustion-class number of the water heater, and is increased at a preset second set temperature gradient greater than the first set temperature gradient until the temperature reaches the inflow temperature corresponding to the minimum combustion-class number after passage of the set period. |
