Patent ID: 6810836
Filing Date: 2004-11-02
Classification: F24H,F28D,F28F

Abstract:
A finned tube water heater, comprising:a pair of flow manifolds, each having a water inlet and a water outlet and a plurality of connecting openings; a plurality of circular flow tubes arranged in stacked fashion to form a tube bundle which surrounds an initially open interior space, each flow tube having a pair of opposing connecting ends which connect to selected connecting openings provided in a selected one of the flow manifolds; a burner having a burner outlet which communicates with the interior space within the stacked tube bundle for producing products of combustion for heating water flowing in the flow tubes; and wherein the flow tubes have external fins located on an exterior surface thereof, the external fins being crushed to form upper and lower flat stacking surfaces for stacking the tubes to form the tube bundle, the external fins also being crushed to form angled baffle surfaces about an external periphery of the tubes, the baffle surfaces serving to retain heat from the products of combustion of the burner which are released into the interior space within the stacked tube bundle.