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Discuss Name the pipe/fitting type: Water return inside water in in the Fittings & Pipes area at

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  1. Dan'llfixit

    Dan'llfixit New Member


    I am trying to find the name/type of pipe in which the one water pipe is contained within another but with opposite flow. I have attached a childlike 2D drawing for clarification.

    Any help/advice appreciated.

  2. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    Never seen it before.
    • Like Like x 1
  3. rpm

    rpm Trusted Plumber

    • Useful Useful x 1
  4. townfanjon

    townfanjon Trusted Plumber GSR

  5. Robert Hyde

    Robert Hyde New Member

    What specifically is it used for?
  6. Chalked

    Chalked Plumber GSR

    Can't remember,ember the name. But there is a pipe in pipe that can be used on secondary hot water circ.
  7. Chuck

    Chuck Active Member

    You have sketched a "concentric tube, counterflow heat exchanger".

    Whether that is actually its role in your application depends on details that you have not shared with us. You probably won't be able to pick one up at Screwfix. Try talking to companies specialising in hydraulic/pneumatic sytems, e.g.


    Don't expect them to be cheap. :)
    Last edited: Jun 7, 2017
  8. quality

    quality Plumber GSR

    Yes its called a heat exchanger jerome or stanref would be my port of call
  9. dan_the_plumber

    dan_the_plumber GSR

    Could use for distillation. Could make some moonshine with that! Lol
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