Posted by Texasmark1 on December 05, 2016 at 06:31:04 from (99.198.13.55):
In Reply to: LP water heater? posted by tomstractorsandtoys on December 05, 2016 at 05:56:36:
On working, I'd guess it's all about volume, discounting the PVC part which could be a show stopper. Without calculating, area of 2" vs 3" is half and if 4 inch would be ¼. So forced air would have to increase the volume by that ratio to keep things in perspective when the fire is lit.....so you need a sensor to sense that and turn on the vent fan when the flame is present, again just a hip shot.
However, PVC is temperature limited.
Then you look at where does the 2x or 4x volume of air originate? Comes up through the flue across where the fire is attempting to burn from the opening where access to the burner is located. Seems to me that it would blow the fire out at least on that side and you would have raw gas accompanying your vent gasses..
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