Locating obstruction in finished underfloor heating system (water)

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by FisheryCottages, Sep 28, 2004.

  1. FisheryCottages

    FisheryCottages New Member

    Sep 28, 2004
    Would really appreciate any ideas to locate obstruction in a new underfloor heating circut.(water system off a gas boiler) Unfortunately all finished flag flooring in place. Plumber has traced to one room but says whole floor needs to be dug up......yikes.
    He says there is minimal flow so is there anything that can be put in that would concentrate at the blockage and be traceable.......?

    With Thanks,
  2. e-plumber

    e-plumber DIY Senior Member

    Sep 1, 2004
    New York

    Are you positive there is an obstruction in the piping?
    I came across the same problem recently on a newly installed radiant heating system, it turned out to be that the run of 1/2" plastic pipe from the boiler room to the family room was too long and a loss of pressure occured. We could not bleed the air out which appeared to be an obstruction/decrease in water flow in the zone.
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  4. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona

    The problem is most likely a pinched pipe, so a leak locator might be able to hear the "rush" as the water flows through the pinched point. Unfortunately, even if you find the spot, good practice would preclude patching it, so unless it could be strainghtened out successfully, (without weakening the tube at that point), the entire section would have to be replaced. I am also concerned that it appears that more than one room is one that circuit. We always install separate circuits for each room so the individual temperatures could be regulated, or at least the flows could be modulated so the rooms heated unformly.
    Last edited: Sep 28, 2004
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