Lennox Whisperheat G20 with standing pilot

[Tom D]

I have a Lennox Whisperheat G20 furnace that was installed around 1992. These units where available with either ignition or a standing pilot. Mine has the standing pilot.

Not too many years after it was installed it needed a new heat exchanger. At the time I had several people look at the installation and nobody could see any reason it would have rusted.

I've now found several old posts from this forum (around the year 2000) on google indicating that there was a problem with the standing pilot models because the damper door was cutting off air to the pilot when the furnace was off, causing them to rust.

Looking at the unit now (though I obviously can't see the heat exchanger) things are looking awfully rusty, and I'm not going to use it until I can get it looked at.

Does anyone recall this or have any information on this defect? I called one Lennox dealer in my area today and they sort of pleaded ignorant about it. I plan on calling others.

Thanks a million in advance for any information.

Tom

[DANgER / danger]

I agree, no point in replacing the heat exchanger unless your gonna convert to spark igniton. Dont worry about the rust too much, the heat exchangers all crack in the same place, standing pilot or not.

I have probably written 30+ red tags on defective G20 and G8 heat exchangers. Both models use the same style heat exchanger and I find small hairline cracks at the back on the sbend. I take the heat exchanger out and fill the cell with water and show the customer it leaks.

Get rid of the lennox POS.

Buy a Trane

-CanadianHeat

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[Bubba]

Just a FYI for you................. You can take most new heat exchangers out (especially the crimped one), fill them with water and they too will leak. Brand new right out of the box. Bubba

[Anonymous]

Yeah our local codes allow for a 3% loss in a heat exchanger. When you water test the g8 and g20 heat exchangers you will see water leak thru the actual metal at the sbend. I'm starting to see alot fo cracks in g26 as well, different heat exchanger though. York makes a crappy crimped heat exchanger. They wouldn't hold water LOL

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