Fuel burner forfuel oil and the like is comprised of a pair of plenum type atomizers (26,26'), each having a convex surface onto which the fuel is flowed for atomization, the atomizers (26,26') being disposed atthe end of a flametube (3) which in turn is located within ablasttube (1), said atomizers (26,26') further being disposed symmetrically with respect to the axis of both the flame tube (3) and the blast tube (1) whereby the spray output from the atomizers is discharged into the flame tube (3) to create a stable flame front that can be readily ignited by a spark type of ignitor (18). The atomizers are provided with one or more apertures (29') through which atomizing gas is passed to generate the spray, and air access ports (12,12',13) are located along the flame tube to provide the necessary air to complete the combustion process.