Abstract: An atomizing burner with a nozzle tube having a mouth opening edge, for feeding liquid fuel to a firing chamber, is to be improved in that, for the purposes of combustion of heavy oil the nozzle tube 33 is surrounded by a jacket tube (14) which projects beyond the mouth opening edge (34) of the nozzle tube and with same forms an annular space (50) for secondary air (z) which can be supplied to the heavy oil downstream of a primary air flow (y) in the flow direction. In addition the jacket tube (14) is to be provided with lateral openings (51) for the secondary air (Z) to be introduced into the annular space (50).