Pex or copper for return

Discussion in 'HVAC Heating & Cooling' started by JOE1934, Jun 9, 2007.

  1. JOE1934

    JOE1934 New Member

    Messages:
    11
    Which would be better, PEX or copper in the return of the slant-fin Base Board . I'm concerned about securing the PEX inside the S/F BB.Where or how do you secure it inside the BB.
    Last edited: Jun 10, 2007
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,814
    Location:
    New England
    For the same size pipe/tubing, pex has a smaller inside diameter, so take that into consideration.
  3. JOE1934

    JOE1934 New Member

    Messages:
    11
    Securing in S/F base board

    I am wondering about securing it in the base board. If I use PEX will the expansion (PEX suppose to expand when hot), be to much inside the S/F BB
  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,814
    Location:
    New England
    I don't know the relative expansion rates for copper and pex, but they both expand when heated. As to running pex along the baseboard, two thing: will sunlight strike it (not good for extended periods), and will it be protected from potential knocks and cuts (copper will dent, but is much harder to cut)? I'd lean towards copper for the increased flow, impact resistance, and UV tolerance. Pex would be cheaper and require fewer joints.
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