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Discuss UFH costing a fortune to run in the Underfloor Heating Forum area at

  1. Mark kennerley

    Mark kennerley New Member

    I have had UFH fitted to an extension approx 50m2. I believe the screed depth is 100-130mm with 100mm kingspan PIR beneath. The system as a whole takes a long time to affect the room temperature, it is set to come on at 6am and by 11am in may have raised the temp by 1-1.5degrees. It is also costing around £4 a day to run (according to a smart meter) and I have seen my utility bills nearly double.

    I know there are many variables that effect the running costs of UFH but this seems out of control. Any advice as to why it may be costing so much and what I can do to help reduce it.

    I have a HIVE thermostat with water temp set at 45degrees with the rom temp set at a min of 20.5 going up to 22 at times through the day. Thanks.
  2. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    :D sorry to say there's your problem maximum screed depth for ufh is around the 50mm mark normally it's a lot less than that

    Any comment @Uheat – Jake@Uheat – Jake @Uheat – Wojtek@Uheat – Wojtek
    • Agree Agree x 1
  3. Mark kennerley

    Mark kennerley New Member

    Most UFH stockists state 60-75mm minimum screed dept???
  4. Darren Jackson

    Darren Jackson Plumber GSR

    You normally have a 100-150mm sub floor then lay UFH and a 50mm screed layed around it.
  5. snowhead

    snowhead Well-Known Member

    What matters is the thickness the manufacturer / designer of the UFH has used in the calculations.

    What pipe system is it and who designed it?
  6. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    I would say that is your about right depth for sand and cement screws depth liquid screed depth normally a lot thinner

    As the thinner it is the less engy it requires to heat it up, so there's your problem I think

    Direct from a manufacturer

    "An underfloor heating system in concrete relies on the thermal conductivity of the screed to transfer the heat to the rooms. It may be a slow response system, so the underfloor heating should be on 24/7 during the heating season with setback options available. It is recommended to use programmable room thermostats for extra comfort."