Abstract: A burner-heat exchanger assembly (100) includes a burner (1) with a tubular diffuser wall (9), a combustion chamber (13) formed inside the diffuser wall (9), a heat exchanger (14) arranged in the combustion chamber (13) and having one or more heat exchange surfaces (31) exposed in the combustion chamber (13). A minimal diffuser-exchanger distance (C) between the diffuser wall (9) and the corresponding heat exchange surface (31) in the combustion chamber (13) ranges from 20 mm to 40 mm.

Abstract: A burner comprises a tubular diffuser wall and an inlet passage of a gas mixture in the diffuser wall, as well as a distribution diaphragm having a distribution opening which forms a central passage section and a plurality of peripheral passage sections, in the shape of rays or branches, extending from the central passage section towards the diffuser wall, and in which the peripheral passage sections and the central passage section are connected together to form a single hole.

Abstract: A burner-heat exchanger assembly (100) includes a burner (1) with a tubular diffuser wall (9), a combustion chamber (13) formed inside the diffuser wall (9), a heat exchanger (14) arranged in the combustion chamber (13) and having one or more heat exchange surfaces (31) exposed in the combustion chamber (13). A minimal diffuser-exchanger distance (C) between the diffuser wall (9) and the corresponding heat exchange surface (31) in the combustion chamber (13) ranges from 20 mm to 40 mm.

Abstract: A burner comprises a tubular diffuser wall and an inlet passage for a gas mixture into the diffuser wall, as well as a first diaphragm with one or more first through openings and a second diaphragm with one or more second through openings of different shape and distribution from those of the first through openings, said first and second diaphragms being substantially concentric and arranged in sequence in the inlet passage.

Abstract: A burner (1) comprises a front wall (2) with an exchanger opening (4) for the passage of a heat exchanger (14), a rear wall (5) with a fume discharge opening (7), a tubular side wall (8), a tubular diffuser wall (9) within the side wall (8), an annular distribution chamber (12) formed between the side wall (8), a combustion chamber (13) formed within the diffuser wall (9) and suitable for the insertion of the heat exchanger (14), wherein the rear wall (5) comprises a cooling interspace in flow communication with the gas supply line of the burner.

Abstract: A burner comprises a tubular diffuser wall and an inlet passage of a gas mixture in the diffuser wall, as well as a distribution diaphragm having a distribution opening which forms a central passage section and a plurality of peripheral passage sections, in the shape of rays or branches, extending from the central passage section towards the diffuser wall, and in which the peripheral passage sections and the central passage section are connected together to form a single hole.

Abstract: A burner (1) comprises a front wall (2) with an exchanger opening (4) for the passage of a heat exchanger (14), a rear wall (5) with a fume discharge opening (7), a tubular side wall (8), a tubular diffuser wall (9) within the side wall (8), an annular distribution chamber (12) formed between the side wall (8), a combustion chamber (13) formed within the diffuser wall (9) and suitable for the insertion of the heat exchanger (14), wherein the rear wall (5) comprises a cooling interspace in flow communication with the gas supply line of the burner.

Abstract: A burner comprises a tubular diffuser wall and an inlet passage for a gas mixture into the diffuser wall, as well as a first diaphragm with one or more first through openings and a second diaphragm with one or more second through openings of different shape and distribution from those of the first through openings, said first and second diaphragms being substantially concentric and arranged in sequence in the inlet passage.

Abstract: Herein a gas boiler burner (1) is described comprising a diffuser, suitable for diffusing premixed fuel gases in a combustion chamber, in which the diffuser comprises a diffuser central portion (10) and two diffuser longitudinally peripheral portions (5), the two diffuser longitudinally peripheral portions (5) being connected together through the- central diffuser portion (10), the central diffuser portion (10) extending longitudinally in a direction perpendicular to the flow of the fuel gases over a length l greater than zero and having transversal cross- sections shaped as a circumference arc having a uniform radius of curvature r, each of the diffuser longitudinally peripheral portions (5) being shaped as a portion of a sphere having radius r.

Abstract: Burners for gas boilers are provided. Such burners include those having a diffuser, suitable for diffusing pre-mixed fuel gases in a combustion chamber, the diffuser having a wall provided with a plurality of diffusion openings; and a distributor, suitable for distributing the combustion gases towards the diffuser, the distributer having a wall provided with a plurality of distribution openings; wherein the diffusion openings are positioned at a diffuser portion and the distribution openings are positioned at a distributor portion, in which the diffuser portion and the distributor portion are laterally offset to each other relative to the direction of the fuel gas flow through said distribution openings and diffusion openings.