| 摘要 |
<P>PROBLEM TO BE SOLVED: To realize a hot-water storage type hot-water supply device capable of accurately predicting boil-up time by performing boil-up operation to obtain a specified heating efficiency even in a heat pump type hot-water supply means. <P>SOLUTION: This hot-water supply device comprises a heat pump unit 2 capable of providing optimum heating capacity by varying a boil-up flow according to the temperature of stored hot water taken from a hot-water storage tank 1 and a control device 200 having a boil-up time calculation means 240 and a boil-up start time calculation means 250 and controlling the boil-up operation. The boil-up time calculation means 240 classifies stored hot-water temperature in the hot-water storage tank 1 into at least two temperature layers, and obtains and adds a boil-up time in each temperature layer from the boil-up flow rate according to the stored hot-water temperature in each temperature layer. Thus, the boil-up time can be accurately predicted. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
