| 摘要 |
The heating boiler consists of a water-bearing housing, in which a cylindrical pipe is arranged, which projects beyond the front wall of the housing. The pipe contains the combustion chamber and the heating-gas flues and is closed with a door. In order to be able to keep this door small in relation to the diameter of the pipe, the pipe (1) is, in the region of extension through the front wall (2), reduced in diameter, pushed through a correspondingly reduced opening (3) of the front wall (2) and welded together from the outside with the opening edge (4) in a liquid-proof manner. <IMAGE>
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