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Gas fired air heater for a central heating system comprising a heat exchanger in which are arranged a series of parallel rows of vertical heat exchange tubes, the lower ends of which are connected to a joint burner compartment and the upper ends of which are connected to a joint flue compartment. Tw

Gas fired air heater for a central heating system comprising a heat exchanger in which are arranged a series of parallel rows of vertical heat exchange tubes, the lower ends of which are connected to a joint burner compartment and the upper ends of which are connected to a joint flue compartment. Two opposite lateral sides of the heat exchanger are connected to air supply and discharge compartments respectively for feeding the air to be heated transversely through the heat exchanger. The lateral air supply and discharge compartments have air inlet and outlet connections at their top and bottom walls only. One of said lateral air compartments is closed at one end and is connected to a fan at the opposite end, whereas at least one end of the other lateral air compartment is connected to a main duct for discharge of the heated air. The heat exchange tubes are grouped in three sections, each of which extends transversely to the direction of flow of the air to be heated and each of which is heated by an individual ribbon type burner. Each section is individually controlled, to which end the individual sections may be connected to the successive stages of a multistage room thermostat set at staggered temperatures.

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Air heater comprising a heat exchanger compartment, in which are arranged a series of parallel rows of vertical heat exchange tubes, the lower ends of which are connected to a joint burner compartment and the upper ends of which are connnected to a joint flue compartment whereas two opposite lateral

Air heater comprising a heat exchanger compartment, in which are arranged a series of parallel rows of vertical heat exchange tubes, the lower ends of which are connected to a joint burner compartment and the upper ends of which are connnected to a joint flue compartment whereas two opposite lateral sides of the heat exchanger compartment are connected to air supply and discharge compartments respectively for feeding the air to be heated transversely through said heat exchanger compartment, said rows of heat exchange tubes fixed by a first, a second and a third burner respectively, each burner comprising a casing having a series of outlet apertures in its upper wall, said outlet apertures being partially closed by a series of suspended corrugated strips in conical configuration alternating with straight strips defining the conical configuration, all of the outlet apertures of a burner being mutually connected by a narrow slot partially closed in the same way as the outlet apertures themselves, said burner casings enclosing an open ended horizontal tube in which are centrally mounted two oppositely directed gas nozzles, and multistage thermostat means controlling the individual burners by successive stages set at staggered temperatures.