Abstract: Disclosed is a burner for liquid fuels which includes a combustion tube having an inner surface defining a combustion chamber, an end bell which mounts a nozzle for introducing the liquid fuel into the combustion chamber in the form of a fine spray, and an auxiliary air introduction means, also mounted to the end bell, which produces an auxiliary vortex flow of air around and concentric with the nozzle so as to entrain the fine spray of liquid fuel and form a fuel-air mixture. Means are provided for igniting the fuel-air mixture, and a main air introduction means is provided for producing a main vortex flow of air which serves to separate the fuel-air mixture from the inner surface of the combustion tube and to provide additional air for combustion of the fuel-air mixture. A collar means, preferably of a refractory material, is provided concentric with the nozzle.