FIRED HEAT EXCHANGER

The fired heat exchanger, having an outer shell (1), water inlet pipe (4) at the bottom and water outlet pipe (3) at the top part, with a combustion chamber (7) enclosed at the bottom with a bonnet (8) with a burner hole (9), connected with tubes (10) for combustion gas flow, through a flue duct (12), to the stack, whereby the tubes (10) for combustion gas flow are arranged in the water tank (14) around the combustion chamber (7) side wall and are connected with the flue duct (12) to the stack with the tube sheet (13) of the water tank (14), according to the invention, is characterised in that the tubes (10) for combustion gas flow are connected to the combustion chamber (7) through holes (11) made in the upper part of the combustion chamber (7) side wall. The tubes (10) for combustion gas flow are conveniently close in shape to an inverse letter "L", with its shorter arm connected to the combustion chamber (7) and having embossed ribs (15).