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Changing 5 ft of 1 Inch copper to 3/4 inch pex

tpost Member Posts: 1
Can i change 5 ft of 1 inch copper out to 3/4 inch pex to move the pipe for visual reasons?  I have a loop system and would like to move a pipe that is running over head thru my finished basement.  it is about 5 ft long and at the beginning of my downstairs heating zone.


  • icesailor
    icesailor Member Posts: 7,265
    Copper to PEX

    You can do whatever you want. No one is watching.

    However, pipes increase as do their squares.

    That neans that it takes 4, 1" pipes to equal a 2" pipe. And it takes 4, 3/4" pipes to equal a 1 1/2" pipe.

    And I think that 3/4" PEX has a smaller inside diameter than 3/4" copper tube.
  • Ironman
    Ironman Member Posts: 7,379
    pipe size

    Ice is right. You get about half the capacity if you use 3/4". Why not use 1"? If you don't have a 1" pex tool, you can use "SharkBite" fittings that transition directly to copper. Make sure that you use Oxygen Barrier pex, not the regular pex that is used for plumbing.

    If you have a Monoflo system, then chocking down the loop to 3/4" is really not a good idea. You also better know how to purge and bleed the air out or you'll be having alot of hydronic head aches.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
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