| 摘要 |
PROBLEM TO BE SOLVED: To appropriately detect abnormality in the temperature of mixture hot water produced by hot water flowing out from a hot water storage tank and water from a water supply path.SOLUTION: A flow volume of hot water flowing from an outflow path of a hot water storage tank to a joint portion and that of water flowing from a water supply path to the joint portion are controlled so as to produce mixture hot water at a set mixture temperature in the joint portion. Mixture hot water temperature abnormality detection means 34 detects a high temperature side abnormality of the temperature of the mixture hot water and mixture hot water temperature high-temperature-side abnormality notifying means 44 makes a notification of the high temperature-side abnormality if the mixture set temperature is equal to or higher than a reference temperature preset to a value except for an upper limit value and a lower limit value in a set temperature range of the mixture set temperature and a detected temperature of the mixture hot water is continuously in a state of being higher than the mixture set temperature by a first high temperature-side allowable value or higher for allowable time or longer or if the mixture set temperature is lower than the reference temperature and the detected temperature of the mixture hot water is continuously in a state of being higher than the mixture set temperature by a second high temperature-side allowable value or higher for allowable time or longer, where the second high temperature-side allowable value being larger than the first high temperature-side allowable value. |
