A premixed gas heating system comprises: a fan assembly (2) configured to supply a premixed air-gas flow required for combustion, wherein a combustible gas of the premixed air-gas flow contains at least 20% by volume of hydrogen; a burner (5) comprising a plurality of holes, wherein the plurality of holes provides a free passage area defined as an area that allows the outflow of the premixed air-gas flow from an area upstream of the burner (5) to an area where flames of combustion are generated; a load controller, configured to regulate an output load of the burner (5) such that the heating system modulates between a minimum load and a maximum load, wherein a ratio between the minimum load and the maximum load is at least 4, wherein the minimum load of the heating system is set such that a combustion index, defined as the ratio between the minimum load and the free passage area of the burner, is between 4 E06 and 6 E07.

A gas burner assembly for a cooking hob, in particular for a domestic cooking hob, includes at least two burner bases arranged side-by-side-and a burner crown element arranged or arrangeable above the burner bases. At least one burner cap is arranged or arrangeable above the burner crown element. The burner bases are adjustable separately. The burner crown element includes a bottom plate subdivided into at least two portions arranged side-by-side. Each portion of the bottom plate is arranged or arrangeable above one of the burner bases. The burner crown element includes at least two side walls. Each side wall encloses one of the portions of the bottom plate. The burner crown element includes flame ports formed in the side walls. The flame ports are arranged in those sections of the side walls arranged opposite to the adjacent portion or portions of the bottom plate.

A fuel-burning cooking burner includes a base defining an outer periphery and an inner open area. The burner further includes a cap coupled with the base around the outer periphery thereof and extending over the open area to define a distribution cavity on an interior side of the cap. The cap further defines a convex outer surface extending opposite the distribution cavity and a plurality of outlets extending through the cap from the distribution cavity to the exterior surface. The outlets are distributed over the entire exterior surface.