Abstract: The atmospheric gas burner for a decorative fire has a mixing chamber (1) closed on an upper side thereof by a burner mat (2) providing a flame-bearing surface and a pre-mixing burner gas/air supply system (4) connected with the mixing chamber (1) on a bottom side thereof. The pre-mixing burner gas/air supply system has a combustion gas injection nozzle (5) and at least one opening (6) for supplying primary air. In order to provide a gas burner which is compact, creates a realistic flame impression with high flames and has a small input gas energy as well as a low pressure drop, a small blower (8) is arranged in the mixing chamber and has a rotor blade or blades (8) that rotate substantially horizontally in operation.

Abstract: The water heater has an upright water tank (1), an exhaust flue (3) extending through the water tank, a combustion chamber (2) arranged under the water tank, an atmospheric gas burner (5) in the combustion chamber and a complete pre-mixing gas/air supply system with outside gas and air intakes. The gas burner has a burner mat (7) with a pressure drop less than 5 to up to 45 Pa. The combustion chamber (2) is provided with an opening (2b), which is not sealed, but enclosed in a flame-blocking manner. The gas burner (5) is attached to a wall section (2a), which is mounted releasably on the: combustion chamber wall (W) over opening (2b) so that a gap of predetermined width is formed between the wall section and wall (W), which prevents backfire of flames into the surroundings but admits secondary air.

Abstract: The gas-fired heater, especially a water heater, has an atmospheric gas burner (5) arranged within a nearly or completely closed combustion chamber (2) and associated with a premixing gas/air supply system (8) with a fuel gas feed nozzle (10). In order to avoid oscillations, which lead to sound waves and combustion instabilities, an oscillation-damping air supply chamber (11, 11?, 11?) is connected to the entrance (8a) of the gas/air supply system (8) for combustion air, within which the fuel gas feed nozzle is arranged. The air supply chamber (11, 11?, 11?) is provided with at least one air entrance (12, 12?, 12?). The air supply chamber can be box-like, duct-like embracing or extending around the combustion chamber or it can be a pipe with different diameter pipe sections.