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Thread: Need advice on concentric vs split vent pipes from basement to roof

  1. #1
    DIY Junior Member PeterDa's Avatar
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    Oct 2011
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    Question Need advice on concentric vs split vent pipes from basement to roof

    Hello,

    I would like some advice on what we should run from our basement up through the roof for immediate and future condensing water heater venting requirements.

    While I have not yet decided on which water heater to purchase, I am at a point in the remodeling project where I need to run the venting.

    Condensing tank heaters such as the AO Smith Vertex uses two 3" PVC
    Rheem tankless uses two 3" PVC
    Rinnai and other tankless units use a concentric system.

    We can run 2 3" pipes up into the attic and then go to a concentric terminator, or run a concentric pipe all the way up.

    Which would give me the best long term flexibility?

    Are there adapters that split a concentric output into separate pipes?

    Thank you for your help!
    -p

  2. #2
    DIY Junior Member saphman's Avatar
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    Jan 2012
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    Northwest Florida
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    imho, I think you are better off running two seperate 3 inch pipes up to just under the roof and then terminating both to a PVC concentric vent. You might encounter too much resistance to air flow and exhaust running concentric all the way.

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