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Discuss Under floor heating, radiator replacement in the Central Heating Forum area at UKPlumbersForums.co.uk.

  1. MalH

    MalH New Member

    Hello, im new to the forum and tried to search for a relevant thread, however only error message! So forgive me starting a new thread!
    I have a heating system utilising microbore and associated manifolds. I would like to replace one radiator with a single zone underfloor heating system.
    Can this be done as a direct replacement? (naturally I require the appropriate valve/pump/stat). I am more concerned with the fact I have a microbore system.
    All UFH suppliers do not state in words or diagrams connection to microbore system!
    Thanks for any help.
     
  2. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    No it can't sorry needs to be from the main circuits before any port valves
     
    • Like Like x 1
  3. king of pipes

    king of pipes Trusted Plumber GSR Top Contributor!!

    No not off a micro bore system bud it will need 22mm flow and return pipework at the boiler. Kop
     
    • Agree Agree x 1
  4. Ric2013

    Ric2013 Plumber Top Contributor!!

    I have plumbed in an UFH manifold off 15mm after the central heating pump as only replacing one radiator in a single room and little over 1kW output. It works well, but was contrary to manufacturer instructions and I wouldn't have done it had this radiator not been the closest to the pump anyway. Perhaps it robs the rest of the system of flow for the 7 minutes it takes to circulate through the UFH pipework, but that isn't something that gets noticed or cared about.

    Main thing is that the UFH manifold needs to have a decent flow when starting from cold so I think you're certainly urinating in the wind trying to run it off microbore. And, as others have said, you need to draw the UFH flow before any zone valves, else the UFH cannot run independently.
     
  5. MalH

    MalH New Member

    Gents, Thanks for the advice - I was afraid this would be the case! Unfortunately some single zone system suppliers are not that clear! Perhaps, profit comes before accurate information!
    My next option, which I am afraid may hit the buffers again, - 'is it possible to Tee off an existing radiator connection to a new radiator, again microbore?
     
  6. Ric2013

    Ric2013 Plumber Top Contributor!!

    Stock answer is no, actual answer is hmm, maybe. Depends on whether the microbore serving that radiator has spare capacity or not, and how big this proposed radiator is.
    EDIT - They would have to be VERY small radiators. I combined once, with the tee only inches from the manifold, and it worked well. But the combined output of both radiators was about 700W, if I remember correctly.
     
    Last edited: Nov 21, 2017
  7. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Sorry to say no again 10mm in reality only does one rad

    Is the other rad close to ??
     
  8. MalH

    MalH New Member

    Its back-to-back, each side of wall. Ie the integral garage converted to room. It only had one rad, therefore was going to tee off dining room rad to aid heating!
     
  9. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Size of each rad ?
     
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