Patent ID: 11906159
Assignee: RHEEM MANUFACTURING COMPANY
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F | IPC F

Claim 14:
15. A method for manufacturing a fluid heating device, the method comprising:
providing an outer shell including a fluid inlet and a fluid outlet;
positioning a heat exchanger concentrically within the outer shell such that a channel is formed between an inner surface of the outer shell and an outer surface of the heat exchanger, the heat exchanger including an inlet tube sheet disposed proximate a first end of the heat exchanger, an outlet tube sheet disposed proximate a second end of the heat exchanger, and a plurality of heating tubes extending between the inlet tube sheet and the outlet tube sheet;
providing a combustion chamber having a substantially frustoconical shape, a first end that has a first surface area, second end that has a second surface area larger than the first surface area, wherein the fluid outlet is positioned in the outer shell at the second end of the combustion chamber, and at least one angled sidewall including an angled portion that extends along a portion of a height of the combustion chamber, the angled portion having an angle relative to the first end of from 90.5 degrees to 120 degrees;
attaching the combustion chamber to the heat exchanger such that the combustion chamber is in fluid communication with the plurality of heating tubes; and
connecting a blower system to the first end of the combustion chamber, the blower system being configured to provide an air/fuel mixture to the combustion chamber.