LIQUID OR GAS HEATER

FIELD: fluid heaters. ^ SUBSTANCE: heater comprises housing made of base and heat insulating wall provided with a burner, heat exchanging module made of axially aligned inner and outer pipes with plug from the side of the burner, combustion passage, inlet and outlet collectors, and chimney. The heat exchanging module has baffles interposed between the inner and outer pipes from both sides of the plug. The baffles form passages for the flow of fluid to be heated. The passages are interconnected. The combustion passage is mounted inside the heat exchanging module. The air duct is defined by the space between the heat exchanging module and heat insulating wall. The valve is mounted from the side of the burner and made for permitting rotation around its axis. The inlet and outlet collectors are connected with the passages of the heat exchanging module from the side of the burner. The passages for fluid to be heated can be in communication through both the opening in the baffles and through additional heat exchanging members mounted in the space of the inner pipe of the heat exchanging module. The outer side of the inner pipe of the heat exchanger is stiffened. The sides of the housing and additional heat exchanging members can be detachable. ^ EFFECT: enhanced efficiency. ^ 7 cl, 5 dwg