| 摘要 |
PROBLEM TO BE SOLVED: To eliminate special parts for simply monitoring the operating state of a pump and to decrease the number of parts by disposing a temperature sensor on the downstream side from the junction of an extra firing circulation circuit and a stirring acceleration circuit. SOLUTION: An ejection opening 13 located at the downstream end of a stirring acceleration circuit 12, i.e., at the junction of an extra firing circulation circuit and the stirring acceleration circuit 12, is opened downstream in a delivery pipe 28 projecting from the outer side wall of a water jacket 22 and the interior of the delivery pipe 28 serves as the outlet 280 of a heat exchanger 20. A temperature sensor 31 is disposed closely to the ejection opening 13 located at the downstream end of a stirring acceleration circuit 12 while facing the ejection opening 13 from the downstream side and connected electrically with a controller 46. When a pump P gets out of order and does not work, bathing water in a bathtub 10 can be prevented from being overheated by a detection signal of the temperature sensor 31.
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