Abstract: A deep fat fryer includes three horizontally aligned heat tubes surrounded by cooking oil in a cooking vessel. An infrared type combustion burner is in each of the two outer tubes and combustion products therefrom are directed along separate paths back and forth through the center tube. The center tube includes a divider, having a zig-zag metal baffle mounted on each side, that forms an upper and lower passage in the tube. A blower forces air to the burners and combustion products from the outer tubes flow over the baffles in the passages of the center tube and out a flue via a divided, insulated plenum.