Direct vent VS concentric
#1
10-31-18, 11:19 AM
Direct vent VS concentric
When the weather is cold is there an advantage with using indoor air as opposed to outdoor air for venting natural gas boilers? It would seem that warmer indoor air would be more efficient, easier to heat than cold outside air? Also would colder air cause more condensate across the heat exchanger and flue?
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#2
10-31-18, 03:36 PM
I think there may be a misstatement here. A boiler's "venting" is the exhaust. I think you mean the boiler's combustion air supply. But, anyway, using indoor air would be a bit more efficient, boiler-wise.
#3
10-31-18, 03:57 PM
Group Moderator
It may be a little more energy efficient using indoor heated air.... but.... you paid to heat that air.
So I'd lean towards bringing in fresh air for combustion.
So I'd lean towards bringing in fresh air for combustion.
#5
11-03-18, 07:51 PM
Zone7: Will cold winter air supply cause more condensate in non- condensing NG boilers?
The relationship between the two is not significant. Theoretically there might be less condensation.
The boiler setup with adequate margin would preclude condensation so it should not be an issue.
