Posting a message to the forum will remove the above advertisement
  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. Checkout our Plumbers Insurance area - heavily discounted Public Liability Insurance and Van Insurance specifically designed for plumbers.

Discuss NO I AM NOT AN UNDERFLOOR HEATING EXPERT! in the Underfloor Heating Forum area at UKPlumbersForums.co.uk.

  1. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    I am no underfloor heating expert. But would be grateful for any help. Can someone tell me why when the UFH is on and nothing else is on. The radiators get hot. And no it's not the 2 port valves. They are both cold both sides? But somehow the return pipe for the heating gets hot? I'm thinking reversed circulation but cannot see where?:mad::mad:
     
  2. SimonG

    SimonG Trusted Plumber

    Sounds like reverse circulation. Can only be that if the 2 ports are cold.
     
  3. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    Any ideas where I should be looking?
     
  4. SimonG

    SimonG Trusted Plumber

    Between the underfloor return and rad return.
     
  5. Matchless.plumb

    Matchless.plumb Trusted Plumber GSR

    Good question though, never came across this type of issue. But if You both think it's the reverse circulation then how does that work
     
  6. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    No idea mate. That's why I'm on here:p:p
     
    • Funny Funny x 1
  7. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    I can see where all 3 returns meet as all the valves and the unvented are in the loft with the boiler. How do o fix it mate?
     
  8. SimonG

    SimonG Trusted Plumber

    Easiest is to put a non return valve on the heating circuit return just before it tees back on.

    My responses are a little slow and out of sink as my posts have to be ok'd.
     
  9. deg

    deg Member

    Non return valve between the two should do the job if the returns are exposed.
     
  10. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    No worries mate. Been a naughty boy?:p
     
    • Like Like x 1
  11. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    I'll give it a go and see what happens.
     
  12. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    So I have been back and fitted the non return valves. The rads are still coming on when the UFH is on? Any more ideas?
     
  13. townfanjon

    townfanjon Trusted Plumber GSR

    Blimey weird one this , is there a pump on the heating and one on the UFH or has sombody tried to use just one ? Bypass anywhere ?
     
  14. Stigster

    Stigster Plumber

    Here is an example of a system in backflow condition. It's not the same as OP's problem exactly but it does show how it happens in this diagram.

    http://www.hertsboilers.co.uk/tech/backflow.jpg
     
    • Like Like x 1
  15. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    Cheers mate. I get the concept. Just don't get why it's doing it now. When it has not for the last 6 years. The owner has not had any work done either.
     
Loading...
Similar Threads - UNDERFLOOR HEATING EXPERT Forum Date
Nu heat underfloor heating Gas Safe Registered Plumbers Only Tuesday at 4:24 PM
Central heating header tank seems to be overflowing... Plumbing Forum Thursday at 6:30 PM