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

Claim 0:
1. A fluid heating device comprising:
an outer shell having a fluid inlet and a fluid outlet, the outer shell defining a fluid heating volume for heating fluid;
a heat exchanger including heating tubes that are each fluidly isolated from the fluid heating volume, the heat exchanger being concentrically disposed with respect to 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; and
a combustion chamber having a substantially frustoconical shape in fluid connection with the heating tubes of the heat exchanger, the combustion chamber including:
a first end having a first surface area;
a second end having a second surface area that is larger than the first surface area, the second end being in fluid connection with the heating tubes of the heat exchanger; and
at least one angled sidewall including an angled portion that extends along a portion of a height of the combustion chamber,

wherein the angled portion has an angle relative to the first end of from 90.5 degrees to 120 degrees, and
wherein the fluid outlet is positioned in the outer shell at the second end of the combustion chamber.