| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive drop-in type water heater 100 capable of announcing a reliable water filling completion. SOLUTION: The integrated value of a flow rate measured by a flowmeter 3 is compared with a predetermined hot water quantity, or a counted hot water supply time is compared with a predetermined time, and it is confirmed that the flow rate of the flowmeter 3 is zero. When it is zero, a control device 2 announces it by announcement means 94 and 95. Otherwise, when supply of hot water in a predetermined flow rate is confirmed by a fixed quantity stop cock 5, or when a predetermined hot water supply time passed, the effect is transmitted to the control device 2, and the control device 2 announces it by the announcement means 94 and 95, whereby completion of hot water filling can be reported with high reliability. At this time, a valve element 57 is opened and closed in a specified opening and closing pattern to use the hot water in a hot water pipe 4 as a signal transmitting medium, whereby the arrangement of electric connection of the stop cock 5 to the control device 2 is dispensed with, and the cost of the drop-in type water heater 100 can be reduced. COPYRIGHT: (C)2005,JPO&NCIPI
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