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This particular water heater (which I purchased about 4 years ago) is a condensing water heater - not sure exactly what that means. It has both intake and output air pipes that are vented to the outside - it uses 4" PVC for both intake and exhaust. It's interesting that the intake and exhaust are right next to each other and fit into a vent that will mounted onto the side of the house (seems to me like the intake would suck in the exhaust but it is made to be that way).
I purchased this several years ago with the intent of mounting it in the attic. I got it up into the attic and that is as far as I got. Have been figuring out how to get water up there but moving to the pantry is a better and much easier option. Unfortunately, it weighs about 80 lbs and was a pain to get up there - now I have to get it back down.
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