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A pulse combustion burner and heat exchanger for immersion in a deep fat fryer vessel. The geometry and juxtaposition of the burner and heat exchanger afford a compact assembly of exceptionally high efficiency. The burner is in the form of a horizontal tube and the heat exchanger for the combustion

A pulse combustion burner and heat exchanger for immersion in a deep fat fryer vessel. The geometry and juxtaposition of the burner and heat exchanger afford a compact assembly of exceptionally high efficiency. The burner is in the form of a horizontal tube and the heat exchanger for the combustion products is in the form of a bottomless, topless rectangular box surrounding the burner.

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1. A deep fat fryer comprising an open top vessel for containing a quantity of cooking oil and a heater unit disposed within the vessel and adapted to be substantially immersed in the oil, said heater unit including a pulse combustion burner and a heat exchanger arranged to receive combustion produc

1. A deep fat fryer comprising an open top vessel for containing a quantity of cooking oil and a heater unit disposed within the vessel and adapted to be substantially immersed in the oil, said heater unit including a pulse combustion burner and a heat exchanger arranged to receive combustion products from the burner and deliver such products to an exhaust, the heat exchanger including a plurality of pairs of substantially flat plates extending substantially vertically in the vessel and forming relatively narrow passages having a height substantially greater than their narrow width dimension, said narrow passages being adapted to receive the combustion products of the burner, said pairs of plates being adapted to be in thermal contact with the surrounding oil and providing heat exchange between the combustion products and the oil, said plates being adapted to induce relatively strong convection currents in the oil to improve the efficiency of the heater unit. 2. A deep fat fryer as set forth in claim 1 wherein said heat exchanger includes an exhaust decoupler/muffler chamber connected by conduit means to said narrow passages for receiving the combustion products of said burner and said narrow passages have a total cross-sectional area substantially equal to that of said conduit means. 3. A deep fat fryer as set forth in claim 2 wherein said relatively narrow passages have a width dimension in the range of from 1/4 to 3/4 inch. 4. A deep fat fryer comprising a rectangular open top vessel for containing a quantity of cooking oil and a heater unit disposed within the vessel, the heater unit including a pulse combustion burner and a heat exchanger both being adapted to be substantially submerged in the oil, the heat exchanger having the configuration of a four sided rectangular, bottomless, topless box, each of the sides of the box forming a hollow chamber by virtue of having a double wall construction, the double walls of at least each of two opposite sides of the box being relatively closely spaced to define narrow passages, the hollow chamber of one and side of the box being interconnected to the hollow chamber of the opposite end side of the box through the hollow chamber of the adjacent sides of the box, the burner having its combustion chamber connected to discharge combustion products into said one end side of the box, the hollow chamber of said opposite end side of the box being connected to an exhaust, said heat exchanger being adapted to conduct combustion products received from said combustion chamber at said one end side hollow chamber successively through the one end side hollow chamber, the adjacent side hollow chambers, and the opposite end side hollow chamber to the exhaust, said double walls of each of the sides of the box being in thermal contact with the surrounding oil and providing heat exchange between the combustion products and the oil. 5. A deep fat fryer set forth in claim 4 wherein said opposite end side chamber is connected to said exhaust through conduit means having substantially the same cross-sectional area as said narrow passages. 6. A deep fat fryer as set forth in claim 4 wherein the spacing of the closely spaced double walls is less than one tenth the width of the box. 7. A deep fat fryer as set forth in claim 4 including an exhaust decoupler/muffler chamber beneath said vessel, said exhaust decoupler/muffler chamber and said vessel including a common wall, the heat exchanger being connected to exhaust into said exhaust decoupler/muffler chamber. 8. A deep fat fryer set forth in claim 4 wherein said combustion chamber is a generally cylindrical tube extending horizontally between said end sides of said heat exchanger box.