Downfired high efficiency gas-fired water heater
US9714774B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 15, 2013 |
| Grant date | Jul 25, 2017 |
| Priority date | — |
| Expiry date | Oct 29, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B30/00
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A high efficiency downfired gas water heater is provided which has a tank for storing water to be heated, a combustion chamber extending downwardly through a top end of the tank, and a gas burner operative to create hot combustion products within the combustion chamber. At the bottom end of the tank is a transfer chamber coupled to an external discharge conduit and to a single pass heat exchanger, in the form of multiple flue tubes. extending vertically through the tank and connected to the combustion chamber. In one embodiment of the water heater the burner is a power burner which forces the combustion products sequentially through the combustion chamber, heat exchanger, transfer chamber and discharge conduit. In another embodiment of the water heater a draft inducer fan is used to draw the combustion products through this path from the combustion chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.