Abstract: A recirculating oven in which air and oxidized gases from a burner tube are directed to evaporation zone outlets at the bottom of the oven and curing zone outlets at the top and fed into a pair of wire work chambers, the gas streams mixing between the zones and return with volatile substances through a return duct to a burner mounted in the upper portion of the burner tube. The burner tube is mounted within a burner tube housing partitioned so that the volatile fumes returning to the burner are maintained separately from the oxidized gases and air exiting from the burner tube. The burner is electrically energized and has a cylindrical housing supporting a number of radial vanes supported between spaced baffle plates, the vanes imparting a vortex pattern to the gases entering holes in the housing periphery. A support plate on the top of the housing carries two high temperature ceramic igniter heater elements surrounded by a multiplicity of resistance type electrical heating elements.