Patent ID: 7708555

Claim:
A gas-fired heating unit comprising at least one atmospheric gas burner, each of said at least one atmospheric gas burner including a mixing chamber and a burner medium covering the mixing chamber; a combustion chamber inside of which the at least one atmospheric gas burner is arranged; a fuel gas/air supply system for supplying fuel gas and air to the mixing chamber of each of said at least one atmospheric gas burner, said fuel gas/air supply system having respective inlet means for the fuel gas and the air arranged outside of the combustion chamber; and an ignition device for the at least one atmospheric gas burner, said ignition device having at least one pilot flame and at least one supply pipe for supplying pilot flame gas to the at least one pilot flame; wherein the ignition device has a respective partially-enclosed secondary chamber configured as an upwardly open mixing space arranged in the mixing chamber of each of said at least one atmospheric gas burner and immediately under the burner medium thereof, wherein the at least one supply pipe for supplying the at least one pilot flame gas is connected to the respective partially-enclosed secondary chamber and wherein the respective partially-enclosed secondary chamber is provided with a corresponding mixing space inlet for primary air.