Indirect water heater and method of manufacturing same

Heat exchange – Casing or tank enclosed conduit assembly – Conduit coiled within casing

Reexamination Certificate

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Details

C219S481000, C165S178000

Reexamination Certificate

active

07007748

ABSTRACT:
A heat exchange assembly adapted for use in a water tank is provided. The heat exchange assembly includes a tube having end portions and a coiled portion between the end portions. A fitting is connected to at least one of the end portions of the tube. The fitting has an end configured to extend through an opening in the water tank, and a surface positioned to limit the extension of the end through the opening in the water tank. The fitting also has an opposite end defining a bore configured to receive one of the end portions of the tube and to limit the extension of the end portion of the tube into the opposite end of the fitting. The bore extends axially beyond the surface of the fitting.

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Dunkirk, Artesian Indirect Water Heater, catalog, Rev. Jul. 2001.
Kevin Rafferty Geo-Heat Center, “Domestic Hot Water Heating,” article, Sep. 2001, pp. 18-21, GHC Bulletin.

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