Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

PEX as return tubing in baseboard enclosure

Options
make a lot of noise as it expands... it will look pretty strange, especially if it pops the cover off...and over time it will be subject to damage due to all the expansion over the fins...yes I know 3/4 M is not cheap...kpc

<A HREF="http://www.heatinghelp.com/getListed.cfm?id=323&Step=30">To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"</A>

Comments

  • Patchogue Phil_29
    Patchogue Phil_29 Member Posts: 121
    Options
    PEX as return tubing within the baseboard enclosure

    I'd like to use PEX as the return tubing within SlantFin Fine/Line-30 baseboard enclosure.

    How should the PEX be protected from cuts and suspended from the brackets? Loosely cinched tie-wraps? Or does there exist a specific "hanger"?

    Will PEX droop too much or be unsightly visible?

  • kevin coppinger_4
    kevin coppinger_4 Member Posts: 2,124
    Options
    I would not use...

    pex for this application...more issues than it is worth....kpc

    To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"
  • Patchogue Phil_29
    Patchogue Phil_29 Member Posts: 121
    Options
    Can you....

    ....please explain the issues?

  • Patchogue Phil_29
    Patchogue Phil_29 Member Posts: 121
    Options
    Noise?

    Pex makes expansion noise? I've never tried to listen to some..... what does it sound like compared to copper fin tube expansion noise?

    As far as damage, that was my big question of my post, how to keep it from being damaged. I figure suspending it above the fins inside the brackets, Just not sure what is the best method.

  • J.C.A._3
    J.C.A._3 Member Posts: 2,981
    Options
    Slant-Fin.....

    Used to include "J- hooks" in with their baseboard for use as a return hanger. (Do they still?)

    I have used Pex-Al-Pex as a return inside an enclosure with no problems. The PAP expands at almost the same rate as copper, and I haven't heard any noise complaints to date.I used simple "Talon hangers", right into studs. Chris
  • Bob Bona_4
    Bob Bona_4 Member Posts: 2,083
    Options
    use

    PAP such as Fostapex and call it done. I do it all the time. Let the PAP rest on the fins. Keep any brass adapters off the fins. HTH
  • hot_rod
    hot_rod Member Posts: 22,154
    Options
    Straight lengths of PAP

    would be my choice for that.

    Remember with regular pex the EVOH O2 barrier may not be UV protected. Some brands are adding and extra PE layer over the EVOH layer for UV protection.

    I use the Viega FostaPex for jobs like that. The sell all sizes in 20 foot straight sticks. Silver jacket, but I think they offer additional colors now.

    hot rod
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Patchogue Phil_29
    Patchogue Phil_29 Member Posts: 121
    Options
    hooks

    They show them on their website pdf literature, not sure if they are an option item when ordering baseboard. I do not recall seeing them included.

    I am wondering if over time a wire hook would cut into the pex.
  • Bruce Stevens
    Bruce Stevens Member Posts: 133
    Options


  • Patchogue Phil_29
    Patchogue Phil_29 Member Posts: 121
    Options
    Silver jacket

    Silver would blend in against the fins I guess.

  • Patchogue Phil_29
    Patchogue Phil_29 Member Posts: 121
    Options
    pex roll

    I am in need of buying a roll of O2 barrier PEX for a homerun to baseboard (is that called PEX-b?), but wasn't going to buy PEX-AL-PEX for that.

    Wondered if that type would work OK as a return inside the enclosure.
  • hot_rod
    hot_rod Member Posts: 22,154
    Options
    The front cover

    pretty much hides that additional tube. It will be visiable where it goes thru the floor.

    I've seen that additional tube on top, as well as below the fin tube element. Some brands have a notch in the fin carrier to allow the additional pipe to fit closely.

    hot rod
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • hot_rod
    hot_rod Member Posts: 22,154
    Options
    regular pex moves quite a bit

    as it heats and cools. PAP tube is much more stable as far as expansion issues.

    Regular pex, especially long runs, will need some room to expand. Like oversized holes with insulators.

    You should be able to find a supplier that stocks straight lengths of whatever brand PAP, or FostaPex you like.

    hot rod
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Patchogue Phil_29
    Patchogue Phil_29 Member Posts: 121
    Options
    Hidden

    The enclosures go from wall to wall, so the pipe is hidden.

    This is in the 1/2 story of a Cape house. Closets are on one side, in front of kneewalls. Will run the PEX inside the closet above the door opening.

    Originally, baseboard was fed by copper running inside the unheated kneewalls. My parents decided it was a good idea to close the bedroom doors on this 1/2 story they do not use. Well, battery in eletronic thermostat died, pipes froze inside the eaves behind kneewalls. Leaked on diningroom ceiling when it thawed.

    30-some years ago when I was a skinny young teenager I fit inside the kneewalls and ran the copper as per my old man's direction. I don't have the inclination to squeeze in there now.



  • hot_rod
    hot_rod Member Posts: 22,154
    Options
    If you run over doorways

    be sure to use a good air purger back at the boiler. I like the Spirovents for that application. You need to collect all those micro bubbles, else they end up gathering at those high points over the summer.

    It's the mesh screen in the Spiro that does an excellent job of catching the small bubbles. They pass right through a scoop type purger.

    Don't oversize the piping so you keep the velocity (4FPS) up to move air along.

    Often times 5/8 tube is plenty for baseboard runs. Possibly 1/2 on short baseboard loops.

    3/4" pex, even PAP can be a bear to run in baseboard enclosures :)

    hot rod
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
This discussion has been closed.