Gas burner (1) comprising a mixing chamber (5); a burner head (19) provided with a plurality of openings (22) in fluidic communication with the outside, the burner head (19) constituting part of the wall of the mixing chamber (5), the burner head (19) comprises: a central hole (18); a first zone (23) comprising openings of a dimension of between 0.8 and 1 mm; a second zone (25) surrounding the first zone (23) and comprising openings of a dimension of between 0.8 and 1.5 mm; a solid annular intermediate zone (31) situated between the first and the second zone (25); the burner head further comprising an annular shoulder (21).