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UFH - Two port valve on flow or return?

Discussion in 'Plumbing and Central Heating' started by SpecialK, 26 Sep 2021.

  1. SpecialK

    SpecialK

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    Hi,
    I'm plumbing in my UFH and will be putting a two port valve in so I can control the UFH and radiators separately.
    Is it OK to have the two port valve on the return from the radiators rather than the flow?
    Should I install a two port valve on the UFH and radiators? Or just one on the radiators so I can run the UFH independently.
    Thanks
     
  2. flameport

    flameport

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    Flow is more usual, although it will still work with the valves on the return.
    You need a valve for each part of the system, so one for the radiators and another one for the UFH. A third valve for a hot water cylinder if there is one.
     
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  4. SpecialK

    SpecialK

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    That's great thanks.
    The return is much easier to get to so will probably put them there.
    Do I need a bypass as when both valves are shut no water will flow? It's a vaillant 831 combi. Not sure if it has one internally!

     
  5. ianmcd

    ianmcd

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    If you put them on the return they will possibly make a loud clunk when they close, if another circuit is still running, put them on the flow as they were designed for
     
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