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A heat exchanger furnace includes a firebox, a heat exchanger housing in communication with the firebox for receiving combustion gases therefrom, and a plenum housing surrounding the heat exchanger housing so as to define a plenum chamber therebetween. A plurality of baffles are supported in vertica

A heat exchanger furnace includes a firebox, a heat exchanger housing in communication with the firebox for receiving combustion gases therefrom, and a plenum housing surrounding the heat exchanger housing so as to define a plenum chamber therebetween. A plurality of baffles are supported in vertically spaced apart relation within the heat exchanger housing, which baffles include peripheral edges disposed in clearance relation from the housing sidewalls whereby hot combustion gases rising within the heat exchanger housing are directed outwardly adjacent the heat exchanger sidewall for increased heat transfer to the plenum chamber. Exhaust tubes at the top of the heat exchanger housing may be directed through the plenum chamber for providing additional heat transfer surfaces therein. The firebox may have a frusto conical shaped sidewall whereby the combustion surface area may be adjusted with the level of fuel in the firebox. A forced air supply to the firebox may include a transfer tube in communication with the fuel inlet passage to prevent the escape of combustion gases from the firebox through the fuel inlet passage.

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A heat exchanger furnace, comprising, a firebox including a bottom wall and an upwardly and outwardly flaring sidewall enclosure, an air inlet passage in communication at one end with said firebox, means for supplying air under pressure to said firebox through said air inlet passage, a fuel inlet op

A heat exchanger furnace, comprising, a firebox including a bottom wall and an upwardly and outwardly flaring sidewall enclosure, an air inlet passage in communication at one end with said firebox, means for supplying air under pressure to said firebox through said air inlet passage, a fuel inlet opening in communication at one end with said firebox, means for supplying fuel to said firebox through said fuel inlet opening thereby to adjust the level of fuel in said firebox and a top wall adjacent said upper edge of said sidewall, said top wall having an outlet opening in communication with said heat exchanger housing for exhausting combustion gases thereto, and said sidewall enclosure having a frusto conical shape with a lower edge and an upper edge of larger diameter than said lower edge; a heat exchanger housing in communication with said firebox for receiving combustion gases therefrom and being at least partially defined by at least one upright sidewall, and including a plurality of baffles therein, and means for supporting said baffles in vertically spaced-apart and generally horizontally extended relation therein, said baffles being continuous across said heat exchanger housing and terminating in peripheral edges disposed in clearance relation from said sidewall thereby to define a peripheral clearance opening therebetween; a plenum housing surrounding said heat exchanger housing and spaced therefrom to define a plenum chamber therebetween; means for separately controlling the rate of fuel and air supply to said firebox; a fuel inlet passage in communication with said fuel inlet opening for conveying fuel thereto; and a transfer tube in communication at one end with said air inlet passage and in communication at the other end with said fuel inlet passage whereby air introduced into said fuel inlet passage from said air inlet passage is operative to prevent the escape of combusion gases from said firebox through said fuel inlet passage, said air inlet passage having a reduced diameter portion adjacent said firebox and said transfer tube communicating with said air inlet passage upstream of said reduced diameter portion.