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Reverse return

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fxhvac1
fxhvac1 Member Posts: 1
in Radiant Heating

I’m working on a reverse return hydronic piping system and added a sketch for clarity. After the last radiator, should both the supply and return mains be capped, or just one of them?

1000042813.jpg

. Thank you

Comments

  • Jamie Hall
    Jamie Hall Member Posts: 27,383

    Don't really need a cap —those lines can just stop at the radiator!

    Except… your diagram isn't a reverse return at all. It's a simple parallel. To make it a reverse return, the return line should start at radiator 1, then pick up the others in order, and THEN come back to the close spaced Ts with no connections.

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • hot_rod
    hot_rod Member Posts: 27,481

    the "dead end" method would require more piping.

    Screenshot 2026-04-06 at 8.41.33 AM.png Screenshot 2026-04-06 at 8.41.47 AM.png Screenshot 2026-04-06 at 8.42.23 AM.png
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream

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