| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a hot-water heater with high usability that is adaptive to a case when heating circulation water decreases only by having only one system of a water electrode circuit. <P>SOLUTION: The hot-water heater includes a circulation pump 8 which circulates hot water heated by a heat exchanger 1 through circulation piping connected to respective heating terminals (27a, 27b), a water tank 7 arranged on the circulation piping, a water electrode 13 which detects the water storage state of the water tank 7, and a control part 23, and notifies the user of the fact that the water electrode 13 detects no water in the water tank 7 for a predetermined time from the detection of such a state; and stops the operation when the predetermined time elapses or when the rotating speed of the circulation pump 8 reaches a predetermined value or higher within the predetermined time. <P>COPYRIGHT: (C)2013,JPO&INPIT |
