| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a reverse combustion type water heating system capable of properly preventing freezing of the inside of water pipes of a heat exchanger and residual drain while reducing the number of heaters used for preventing freezing. <P>SOLUTION: In this reverse combustion type water heating system A comprising a combustor 1 for burning fuel downward, the heat exchanger HT mounted at lower portion of the combustor 1 and having the water pipes 22, 23 recovering the heat from a combustion gas generated from the combustor, a bottom casing 3 for U-turning the combustion gas moving and passing through the heat exchanger HT downward, upward and moving the same toward a discharge opening 19a, and the heater 4 for preventing freezing, the heater 4 for preventing freezing is mounted on the bottom casing 3. <P>COPYRIGHT: (C)2007,JPO&INPIT |
