The AutoRecupe Ultra burner incorporates components of a tube firing burner system in a compact package. It is a nozzle mixing burner and recuperator coaxially mounted inside a single-ended radiant tube. Combustion air entering the burner is preheated in the recuperative section by exhaust gases providing higher efficiencies than stand-alone burners. The units are available in sizes of 6 and 7.5 (152 and 190 mm) OD.