Quote:
Originally Posted by S-F
Or for tempering incoming air for the furnace?
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Do you mean combustion air? I thought about running a shell tube heat exchanger (a pipe-in-a-pipe) over the vent pipe to remove SOME heat from it to temper the incoming air, maybe just up to room temp or so. In order to do that I'd have to air seal the burner compartment (not very difficult) and make sure that the exhaust gas temp doesn't drop too low because it's an 80% AFUE non-condensing furnace. I feel better about using waste heat for things like that.