CPC F24H 9/0031 (2013.01) [F24H 1/0027 (2013.01); F28F 1/40 (2013.01)] | 10 Claims |
1. A heat exchanger for a water heater having a burner, comprising:
a tube extending longitudinally along a centerline from a first end adjacent the burner to a second end and defining a passage; and
strips extending within the passage and arranged about the centerline, each strip including a base and fins extending from opposite sides of the base and bent along fold lines to extend radially towards the centerline such that flue gases from the burner flow from the first end to the second end of the tube and in channels between the fins, wherein the fold lines of fins on opposite sides of the base are offset from one another in the longitudinal direction.
|