GAS SUPPLY INTERFACE FOR A WATER HEATER

1 . A gas supply interface for delivering combustion gases to a combustion chamber of a heating device, said supply interface comprising:

a door adapted to fit within an opening to a combustion chamber, said door defines a serrated opening; and

a gas supply tube which defines a flange, said gas supply tube received within said serrated opening such that said flange abuts said door.

2 . The gas supply interface as recited in claim 1 , further comprising a gas supply line which telescopes with said gas supply tube.

3 . The gas supply interface as recited in claim 2 , further comprising a crimp ring which provides a metal-to-metal seal between said gas supply tube and said gas supply line.

4 . The gas supply interface as recited in claim 3 , wherein said gas supply tube is flexible.

5 . The gas supply interface as recited in claim 3 , wherein said crimp ring includes a ramped inner surface.

6 . A method of assembling a gas supply for delivering combustion gases to a device comprising:

telescoping a gas supply line to a gas supply tube;

inserting the gas supply tube through a serrated opening of a door adapted to fit within an opening to a combustion chamber; and

compressing the gas supply tube against the serrated opening.

7 . A method as recited in claim 6 , wherein compressing the gas supply tube against the serrated opening provides a metal-to-metal seal.

8 . A method as recited in claim 6 , wherein compressing the gas supply tube provides a permanent joint between the gas supply tube and the inserting.

9 . A method as recited in claim 6 , further comprising:

abutting a flange of the gas supply tube with the door opposite the crimp ring.

10 . A method as recited in claim 6 , wherein compressing the gas supply tube against the serrated opening provides a metal-to-metal seal with a crimp ring.