Gas burner

A multi-crown gas burner comprising an injector holder module, attachable to a cooking hob, and a flame-spreader module positioned above said injector holder module, said flame-spreader module comprising a circular internal portion which is separated from an external annular portion by a substantially annular cavity, said injector holder module comprises:

• at least one first venturi duct substantially horizontal to which at least one first injector faces, said at least one first venturi duct being in fluid communication with a corresponding first chamber which is in fluidic communication with a first set of doors provided in said external annular portion, so as to generate at least one first crown of main flames,
• a second substantially horizontal venturi duct to which a second injector faces, said second venturi duct being in fluid communication with a zone communicating fluidly with at least one passage provided in said circular internal portion for the generation of at least one simmering flame,
• said at least one first chamber, which is fed by said at least one first venturi duct, communicates fluidly with a second set of doors provided in said circular internal portion of the flame-spreader module, so as to generate a second crown of main flames.