| 摘要 |
PURPOSE:To improve hot water feeding characteristic and improve convenience in use by a method wherein a hot water set temperature is made as a function of a set temperature and a water feeding temperature and the hot water feeding temperature is controlled under a feed-forward control in such a way as a mixing ratio of hot water and cold water is made constant even if a set temperature or a feeding cold water temperature is varied. CONSTITUTION:Water to be fed is divided into a heating passage 3 and a bypass passage 4. A cold water feeding temperature TC is detected by a cold water temperature sensor at the heating passage 3, a flow rate QH is detected by a flow rate detector 9 and then a signal is sent to a calorie control part 13. An amount of gas G to be ignited by a heating device 5 is calculated it a calorie control part 13 in response to a signal from a temperature setting unit 8 and these data and then a signal is sent to a capacity control device 6. Water flowing through the heating passage 3 is heated by a heat exchanger 2, set to a fed-out hot water temperature TH slightly higher than a set temperature TS in view of a cold water mixed part. That is, the water is heated under a feed-forward control. Then, it is mixed with cold water and a hot water temperature TM after mixing is detected by a hot water temperature detector 8 and the degree of opening of an amount of water adjusting valve 10 is calculated in such a way as a relation of TM=TS can be attained.
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