Instantaneous fuel-fired water heater with low temperature...

Details Instantaneous fuel-fired water heater with low temperature... Instantaneous fuel-fired water heater with low temperature...

2005-10-03

2008-03-04

Wilson, Gregory A. (Department: 3749)

Liquid heaters and vaporizers

Stand boiler

Heated by liquid or steam

C122S018100, C122S040000

Reexamination Certificate

active

07337752

ABSTRACT:
An instantaneous type fuel-fired water heater has a variable speed blower that discharges combustion air into a fuel burner utilized to heat water flowing through a heat exchanger portion of the water heater. A portion of the air discharged from the blower bypasses the burner and associated heat exchanger, flows around the heat exchanger, and then mixes with flue gases being discharged from the heat exchanger portion into the flue portion of the water heater. In this manner, such flue gases are cooled by the bypassing blower discharge air to an extent permitting the flue portion to be formed from a low cost plastic material instead of a high temperature metal material such as stainless steel.

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