| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide storage hot water supply unit capable of avoiding stopping of hot water reserving operation due to increase in pressure loss of a circulation circuit. <P>SOLUTION: A control device 100 operates/controls a display part 210 and displays the necessity of pipe cleaning when the device detects a sign of increase in pressure loss of the circulation circuit 20 according to the divergence degree between the actual engine speed of a circulation pump 50 and the ideal engine speed of the circulation pump 50 defined according to the temperature of feed water flowing into a hot water supply heat exchanger 22 and the aimed boiling temperature. Accordingly, the device can urge a user to perform maintenance before occurrence of failure such as stopping of hot water supply operation due to anomaly in the boiling temperature. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
