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Old 07-24-2010, 07:25 PM   #1
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venting tankless water heater vertically


I have a one level house on a concrete slab, no basement. I got a tankless water heater, and because of limitations on placement I have to vent it vertically through the attic and roof. The vent that I have is 3" single wall. I'm going to blow insulation in the attic eventually, and was wondering if there would be a clearance issue. Is the insulation going to catch on fire? What can i do to keep the insulation off the vent? They make an adapter for the 3"/5" concentric pipe which I think would do the trick with the 1" of air space around the 3" pipe, but the adapter has openings in it. Cold air from the outside would rush right down between the walls right into my house in the winter. My water heater isn't set up for the concentric pipe, it takes in combustion air from the room. Any suggestions?

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Old 07-25-2010, 09:32 AM   #2
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venting tankless water heater vertically


I'm pretty sure you can't put that thing somewhere where it uses the room air for combustion. It'll kill someone.

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Old 07-25-2010, 05:08 PM   #3
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venting tankless water heater vertically


What do you mean by that? How is drawing combustion air from a room going to kill someone? The instructions just say not to put it somewhere where you store combustable materials like solvents and paints and stuff, so it doesn't take in cumbustable vapors.

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Old 07-25-2010, 10:56 PM   #4
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venting tankless water heater vertically


I'm going to go out on a limb and say since you're asking that question, you probably should just hire a pro. . .
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