Condensing boiler

摘要

The condensing boiler has a gas- and oil burner in a combustion chamber (1), which is limited to large part of its periphery by a heat-exchanger passing through with water. The combustion chamber is arranged horizontally. The combustion chamber is limited in the lower- and in the lateral areas of multiple heat exchanger pipes (7,7') of a heat exchanger step (A). The heat exchanger step forms an axially running gap for a passage of hot gases in radial direction in an exhaust collecting chamber (8) between two adjacent heat exchanger pipes.