| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat pump hot water feeding system which can be used without any obstacle even when water containing a hardness materials is utilized in feed hot water to effect heating. SOLUTION: The hot water feeding system is provided with an upper limit temperature varying means 14 to vary the upper limit temperature of feed hot water capable of being heated by a feed hot water heat exchanger 5. Since the upper limit temperature varying means 14 varies an upper limit temperature to an upper limit temperature not to deposit a hardness material or an upper limit temperature not to corrode the heat exchanger when an upper limit temperature is varied to an upper limit temperature at which a hardness material capable of being decided from water quality of utilizing feed hot water is not deposited, or increased to a value exceeding an upper limit temperature, even when water in which a hardness material is dissolved, acid water, and alkaline water are heated as feed hot water, fixing of a hardness component to a feed hot water heat exchanger and corrosion thereof can be suppressed. |
