| 摘要 |
PROBLEM TO BE SOLVED: To provide an instantaneous hot water system capable of preventing degradation of the heat efficiency during the boil-up in a heat pump when executing the hot water circulating operation for instantaneous hot water supply.SOLUTION: The instantaneous hot water system 1 includes a circulating pipe 8 which is branched from a hot water feeding pipe 7 and returns to a hot water storage tank 2, and performs the instantaneous hot water circulating operation by using a circulation pump 4 installed in the circulating pipe 8. In the middle of the circulating pipe 8, a medium temperature hot water using apparatus 3 for using the calorie of the hot water passing through the circulating pipe 8 is provided. In this constitution, the water of low temperature can be returned to the hot water storage tank 2 by using the calorie of the medium temperature hot water using apparatus 3, and degradation of the heat efficiency during the boil-up in the heat pump 9 can be prevented. |
