Hello With the amount of open holes in the rear part of the combustion chamber, we regulate the descent of part of the high-temperature flue gases from the first draft directly into the chimney, thereby raising the temperature of the flue gases to prevent condensation in the chimney. The other flue gases are turned in the combustion chamber and, after turning again at the boiler door, travel along the boiler exchanger into the chimney. By shortening the combustion chamber, it is possible to turn almost the entire amount of flue gases and maintain the flue gas temperature above condensation. Considering this, I think that you can replace the combustion chamber without any problems, but of course it is necessary to check the combustion with a flue gas analyzer and, if necessary (by opening the holes of the combustion chamber), set the temperature of the flue gases. Greetings
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