High efficiency water heater
US7559293B2 · kind B2 · utility
20Cited by
16References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 26, 2003 |
| Grant date | Jul 14, 2009 |
| Priority date | — |
| Expiry date | Feb 26, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B30/00
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A flue system is provided for a water heater having improved heat exchange efficiency. The flue system includes an upstream heat exchange portion having at least one substantially vertical flue tube. The flue system also includes a downstream heat exchange portion having at least one substantially vertical flue tube. The upstream heat exchange portion provides a first pass for heat exchange with water in a water heater. The downstream heat exchange portion provides a second pass for heat exchange with water in the water heater.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.