Gas premixing system which is configured to feed a burner, in particular a burner of a condensing boiler, comprising: a premixing body (11) which delimits a premixing chamber (12), the premixing chamber (12) having an inlet (13) for an air / gas mixture wherein the premixing chamber (12) is configured for supplying the air / gas mixture to the burner (9), and segmentation means (14; 14 '; 14 ";14"') which divide the premixing chamber (12) into at least a first sector (A) and a second sector (B) segmented, wherein the first sector (A) is configured to feed a first area (C) of the burner (9) and the second sector (B) is configured to feed a second area (D) of the Burner (9) is configured, wherein the segmentation means (14; 14 '; 14 ";14"') comprises a closure means (17; 17 '; 17 ";17"') to prevent the passage of the air / gas mixture between configured in both sectors (A, B) of the premixing chamber (12), characterized in that d as the segmentation means (14; 14 '; 14 ";14"') has a segmentation element (15) which delimits a closed contour inside the premixing chamber (12), the closed contour being the second sector (B), the first sector (A) the segmentation element (15) outside surrounds, wherein the segmentation element (15) has an opening (20) which connects both sectors (A, B) of the premixing chamber (12), wherein the closure means (17; 17 '; 17 ";17"') the opening (20 ) closes in a closed position so that the gas / air mixture only reaches the first sector (A) in the closed position.
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