Abstract: This invention refers to a burner for fluid fuels comprising an essentially cylindrical burner housing having an open end and a closed end, the open end being connectable to an exhaust pipe, a fuel supply means in the closed end in the longitudinal center axis of the housing, a combustion air supply passage in the peripheral wall of the housing, a tubular combustion chamber arranged co-axially within the housing, an annular space between said combustion chamber and the inner peripheral wall of the housing an annular space, said space being closed towards the open end of the housing, said air supply passage opening into said annular space.