Central heating boiler has hearth with heat exchanger having water flow tubes and fume pipe for hearth

摘要

The central heating boiler has a hearth (2) with a heat exchanger having water flow tubes (3) and a pipe (4) connecting the fume outlet (24) to the inlet (31). The pipe is surrounded by a jacket (41) connecting the hearth jacket to the heat exchanger circuit. The heating circuit return section connecting the heat exchanger inlet (3) and the outlet (23) passes through the water jacket collector. The flume output is through the heat exchanger. An insulating gap encloses the hearth, the heat exchanger and the connecting pipe.