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 What do you do for HEAT when the power goes out?
Boot Strapped Natural Gas Furnace
Heats even when there is a Power Outage
During power outages, a battery back-up is used to operate the wall thermostat controlled natural gas valve. Boot strapping this supply is a ThermoElectric Generator positioned in the flame or exhaust stack.
If one's house is heated by natural gas (or propane) and there is a prolonged power
outage--as is the case this season in many parts of the country: how can one use their
gas furnace to stay warm?  Are there gas furnaces that will operate with no electricity?

I searched the various furnace manufactures and various gas companies' web pages
and have not found any instance of there being a furnace that runs without electricity.

During the recent ice storm when I lost my electricity, I started figuring out how I might still heat my house with my gas furnace. I switched-off the A.C. to the furnace and substituted a ~9 volt battery for the normal 24 volt A.C. supply, opening the natural gas valve and starting the furnace. 

To help convection through the system, I also opened the furnace air intake/inspection cover at the furnace base. 

With no fan running, the furnace furnished a surprising amount of heat to the upstairs.  After an extended period of time, the over-temp (blower failure safety switch) switch kicked "out" and shut off the gas flow until a cool down period...

It seems that there might be a real need for such a device for those who live in a severe cold climate.

Of course, the killer in all this--assuming the idea is really useful--is the regulatory jungle that is laying in wait for anyone who dares!


 
Battery Backup Circuit

 
 
Thermo Electric Generator Characteristic Curves
  From Melcor's Development Software "AZTEC"

 
 
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