| 摘要 |
In a liquid heating apparatus according to the present apparatus, an external drum comprising a dual wall is provided in a water tank, the external drum has a combus- tion gas distribution chamber formed in the dual form, an internal chamber having a combustion chamber is provided therein and a partitioned water chamber is formed therebe- tween, an upper communicating tube penetrating the exter- nal drum and communicating to inside of the water tank and a lower communicating tube communicating the lower section of the partitioned water chamber to the base of the water tank are provided in the upper and lower sec- tions of the partitioned water chamber respectively, a draft tube communicating a combustion chamber to a combus- tion gas distribution chamber is provided in the upper section of the partitioned water chamber, an exhaust tube opened to the outside of the water tank is provided in the lower section of the external drum, and a combustor sup- port cylinder penetrating the external drum and the parti- tioned water chamber and thrusting from the side wall of the internal drum to outside of the water tank is provid- ed.
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