| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem that temperature of circulating fluid decreases in a latent heat secondary heat exchanger when a hot water supply function and a reheating function are simultaneously used, in a water heater having a conventional hot water supply function and a conventional reheating function. <P>SOLUTION: The water heater 1 includes a latent-heat heat exchanger 30, a sensible-heat heat exchanger 20, a combustor 9, a first heat exchanging flow passage in which a first heated fluid passes through the latent-heat heat exchanger 30 and goes into the sensible-heat heat exchanger 20, a latent heat secondary heat exchanger 35 indirectly heated inside the latent-heat heat exchanger 30, a sensible heat secondary heat exchanger 25 indirectly heated inside the sensible-heat heat exchanger 20, a second heat exchanging flow passage in which a second heated fluid passes through the latent heat secondary heat exchanger 35 and goes into the sensible heat secondary heat exchanger 25, a bypass flow passage 41 bypassing the latent heat secondary heat exchanger 35, a switching means 40 for switching flow passages of the bypass flow passage 41 and the latent heat secondary heat exchanger 35, and a switching control means 71 for determining a switching condition of the switching means 40. <P>COPYRIGHT: (C)2012,JPO&INPIT |
