Furnace condensate

tomturkey

Well-known Member
What are the properties of the "water" that flows from the 90+ efficiency furnaces. Where does it come from, the burning of the fuel(LP) or relative humidity of the air? just wondering if its useful for anything. gobble
 
It's a product of combustion! H2O. For every gallon of propane or equivalent fuel you burn you put about 3 quarts of water into the air. I think that is contributing to all the excess rain we are having. I am not sure if it's as good as distilled water, there might be by-products of combustion in it.
 
It eats steel over time, as well. Ever see the side of a furnace where there's been a leak that dribbles out a little condensate.
 
my cat has been drinking it routinely for years. It drips out over a floor drain in the basement.
 
Well then, won't water the plants, or use it in batteries or radiators or water the critters. Will just pour it on the driveway (limestone) maybe some weeds won't grow next spring. thanks everyone, I suspected it was acidic, but thought I would ask. gobble
 

The condensate from my furnace is piped through pvc, over to within 15 inches of the basement floor drain. It then runs across the concrete floor, to the drain that is covered with a steel drain cover. No deterioration of the concrete or steel in the 17 years that the furnace has been installed.
 
When recuperative furnaces first came out the flue pipe had to be 304 stainless. The stainless would corrode. The engineers said that the water was about as acid as Coca-Cola and the flue pipe had to be changed to 29-4c stainless. The codes would not allow PVC, now they all use PVC.
 

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