Patent ID: 7784434

Claim:
A heat exchange element for a central heating boiler, which heat exchange element is designed as a substantially aluminum monocasting, the heat exchange element being provided with walls which bound a water-carrying channel, and with at least one wall which bounds at least one flue gas draft to which a burner can be connected, at least one wall which bounds the at least one flue gas draft being water-cooled in that it also forms a boundary of the water-carrying channel, wherein at least one water-cooled wall is provided with heat exchanging surface enlarging pins and/or fins which extend in the respective flue gas draft, characterized in that the cross-sectional surface of ones of the pin and/or fin is smaller than 25 mm 2 and, wherein heat exchanging surface enlarging pins and/or fins are arranged in the water-carrying channel, which heat exchanging surface enlarging pins and/or fins arranged in the water-carrying channel each have a base that is connected to the wall which bounds the at least one flue gas draft.