| 摘要 |
<p>A circulating-type hotaater supply device (1) is provided with a heat exchangger abnonnality detennining unit (62). which inhibits execution of a suitable temperature maintaining operation when the suitable temperature maintaining operation continued for 5 a predetermined time or more and stops a circulating pump (25), and when a temperature rise range of a detected temperature of a heat exchanger outlet temperature sensor (2) after stopping the circulating pump (25) becomes equal to or more than a temperature rise threshold value detennined according to a selected state of bumer blocks (3a),(3b) in a combusted state immediately before stopping the circulating pump (25), determines that a 10 heat exchanger is in an abnormal state. F,- WATER1111 -,4 5- 3a- 24 Fin32 34 _J ET 60 J, I n 61 14 Ts 18 10 23-63 X, I 1 X2 WATER</p> |
