Patent ID: 6945196
Filing Date: 2005-09-20
Classification: F23C,F23D,F24H

Abstract:
1. A water heater comprising an upright thermally insulated cylindrical water tank ( 1 ) with a lower wall ( 1 a ), an exhaust flue ( 3 ) extending axially and centrally through the water tank, a combustion chamber ( 2 ) arranged under the lower wall ( 1 a ) and connect to the exhaust flue, an atmospheric gas burner ( 5 ) in said combustion chamber and a complete pre-mixing gas/air supply system for the atmospheric gas burner, wherein said atmospheric gas burner comprises a burner mat ( 7 ) providing a combustion surface and said gas/air supply system has respective intakes for combustion gas and for combustion air arranged outside of the combustion chamber; wherein the gas burner ( wherein the width of the gap is such that secondary air flows into the combustion chamber ( wherein said burner mat has a porosity such that a pressure drop across said burner mat (