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Old 04-22-2011, 08:24 PM   #1
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Riannai tankless water heater venting


Our old water heater rusted out and sprung a leak, so no hot water until it gets replaced. My brother/landlord decided he wanted to try tankless. The gas and water seem basic enought just have to go and get an external pressure relief valve. My question is on the venting, my understanding is that the concentric pipes are used because todays homes are so airtight. I don't have that problem/benifit. Lots of air leaks. So would it be possible to vent just the exhaust up the chimney like the old one or do I need to use both pipes and vent through the wall? The pipes suggested are steel inner and stell or plastic outer, not stainless

Thanks for any help

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Old 04-23-2011, 07:24 PM   #2
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Riannai tankless water heater venting


Your combustion air needs to draw from outside.

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Old 05-16-2011, 07:04 PM   #3
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Riannai tankless water heater venting


Bought the right venting for 2 reasons, 1 just safer that way, and 2 my chimney flue isn't stainless so it won't take the heat. Pricing is ridiculess though. over $200 for 18 inches of venting
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