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PEX to copper question

Joe_13
Joe_13 Member Posts: 201
in THE MAIN WALL
I want to add a BB rad into a 3/4" copper loop. I want to use PEX so I can fish the tubing over a finished ceiling in the basement. What size PEX tubing would be equivilant to 3/4 copper: 3/4", 1" or is there a 5/8" tubing that would not change the flow rate? I assume they make compression fittings to join the two.

Comments

  • kevin
    kevin Member Posts: 420
    how many....

    feet of baseboard are on that zone? You will be safe if you use 3/4" pex. Make sure that the pex has an Oxygen barrier.Wirsbo makes 3/4" and it has good connection adapters. kpc
  • heatboy
    heatboy Member Posts: 1,468
    Why use 3/4\" PEX?

    What's the load of the area served by the baseboard? I have many loops of baseboard that are piped in 1/2" PEX. Use 1/2" if the load is 15MBH or less. Mucho easier to work with. Depending on the water temperatures involved, using PEX-AL-PEX may be a better alternative to regular PEX.

    hb

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  • kevin
    kevin Member Posts: 420
    that's why...

    I asked how many feet of baseboard...he will probably be pushing the limits if he uses 5/8"pex and has 65' of baseboard at 180F.kpc
  • Joe_13
    Joe_13 Member Posts: 201


    Thanks for the info. The loop has about 50ft of BB already:
    kitchen, dining room and one whole side of the living room.
    Living room felt cold over on the far end where there was no BB on those very cold days this past winter. A large bow window and skylights were added just a few years ago but it has not been this cold in almost 7 years in the New York area. I just want to add an extra 5ft of BB on the far wall to help balance the temp in the room. Probably need 50ft of PEX just to tap the loop on the other side of the house. Split level with one zone for living and bedroom floors. Raising water temp just over heats the rest of the zone.
  • heatboy
    heatboy Member Posts: 1,468
    Instead of.........

    adding more baseboard, split the loop halfway through so you will have more heat at the ends of the baseboard loops. Adding 5' of baseboard to an already long loop may not work as well as you would think.

    hb

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