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

Discussion in 'Water Heater Forum, Tanks' started by PeterDa, Oct 31, 2011.

  1. PeterDa

    PeterDa New Member

    Oct 31, 2011

    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!
  2. saphman

    saphman New Member

    Jan 18, 2012
    Northwest Florida
    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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