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Reversing Hydronic Heating Help

P1385 Member Posts: 18
Howdy all! Can anyone direct me to post/articles that can give me a better idea of the reversing hydronic heating arrangement Dan mentions in his article Not All Pipes Are Round? I've taken a cursory browse on The Wall and didn't see any, and I'm not really sure what to search by. Thanks in advance!


  • hot_rod
    hot_rod Member Posts: 16,327
    I don't know of any off the shelf products, they are easy to build for commonly sourced products. I have built a handful with tekmar valves and either Honeywell or Belimo actuators. I added a flow meter to this one I built years ago to see what flow you can actually achieve in a 1000' loop of 1/2" pex :)

    Here is the math and an article better explaining the concept.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • DanHolohan
    DanHolohan Member, Moderator, Administrator Posts: 15,989
    I saw the job I wrote about in 1995. I remember they used a motorized four-way valve and a single-speed circulator. A timer controlled the position of the valve and the on-off operation of the circulator. Wish I could give you more details but it happened 25 years ago.

    Imagine what they can do today.
    Retired and loving it.
  • stonebutson
    stonebutson Member Posts: 24
    A Europe thing? He talks about it in his hydronic book. Loop is on a timer and reverses flow through the loop regularly so that the loop heats evenly. Forty years of cellars and I’ve never seen it here in New England Boston area
  • DanHolohan
    DanHolohan Member, Moderator, Administrator Posts: 15,989
    This is the company that I visited all those years ago: https://translate.google.com/translate?hl=en&sl=de&u=https://www.rom-technik.de/&prev=search

    I have never seen anyone else do what they did.
    Retired and loving it.