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Lucian Lange
11-04-2011, 10:07 AM
I am working on designing a large house. The house will have 2 water heaters and 4 furnaces. All will be high efficiency units. My question is: Is it possible to gang the PVC flues together and gang the PVC intakes together?
Jim Robinson
11-04-2011, 04:02 PM
That's going to be a question for the manufacturer's. I doubt that they will be in favor of it. In theory yes, it could be done. In reality, I'm not sure you'll find an approved setup. PVC isn't that expensive. I see the problem more on the exhaust side than on the intake.
Joseph Ehrhardt
11-04-2011, 04:04 PM
Always check with the manufacturers web site or call, I have never seen that, I just did a job this past saturday where the unit called for 3" vent and the contractor installed a 2-1/2" and the unit would not run. You need to follow the vent schedule for sure, very sensitive units.
Jim Robinson
11-04-2011, 04:06 PM
Just asking, in IL why wouldn't you use a boiler and baseboard or in floor radiant for the heat system? Is it for the AC system as well? I'm just not a big fan of forced air heat, but we don't need central AC here, which does change things.
Lucian Lange
11-07-2011, 07:29 AM
Just asking, in IL why wouldn't you use a boiler and baseboard or in floor radiant for the heat system? Is it for the AC system as well? I'm just not a big fan of forced air heat, but we don't need central AC here, which does change things.

We get good cold and hot temperatures in this area. I've seen -25F and +103F. It's hard to heat smaller rooms with just radiant floors and we do need AC.