| 摘要 |
In the pipe 10 for returning cold water to the boiler of the main patent, a bypass 11, 14 is provided which opens out to free air above the combustion products. A layer of Raschig rings 19 is arranged in the path of the combustion products. The outlet of the bypass 11, 14 pours cold water onto the layer of Raschig rings 19. Between the outlet pipe 7 and the return pipe 10 is provided circuit supplies a secondary heating installation. On the bypass 11, 14, the primary circuit of a second heat exchanger 13 is provided whose secondary circuit supplies a low-temperature water heating installation, such as for domestic water. <IMAGE>
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