| 摘要 |
Central heating boiler with an internal combustion chamber which is heated by a downdraught burner and which is surrounded by a water jacket which is formed from two annular coaxial water chambers, connected to a forward run and a return run and passed through by smoke-gas flues, in which cavity-forming elements of ribbed-profile pipes are provided, which are fastened with the ribbed side on the associated wall.
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