| 摘要 |
In a liquid heating apparatus according to the present invention, an internal drum is arranged at a space from and in an external drum, a combustion gas descending chamber is provided therebetween, an outer water chamber having a hot water outlet port and a water supply port in the upper and lower sections thereof is provided outside the combustion gas descending chamber, an inner water chamber communicating with communicating tubes in the upper and lower sections to the outer water chamber is provided inside the combustion gas descending chamber, a combustion chamber communicating to the combustion gas descending chamber in the upper section is provided inside the internal drum, and exhaust port is provid- ed under the combustion gas descending chamber, a smoke col- lecting chamber having a larger cross-sectional area than that of said exhaust port is provided under the exhaust port, and a smoke exhaust port is provided in this smoke collecting cham- ber.
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