Underfloor Heating Temperature

Discussion in 'Plumbers' Talk' started by Sean Owens, Mar 19, 2019.

  1. Sean Owens

    Sean Owens New Member

    Ive had a water based UFH system installed and tiled over. I was advised to wait 28 days before switching on and then to increase the temperature 5°C a day until max temperature is reached (45°C I think). To ensure it’s only 5°C when I switch it on, do I need to set it to 5°C at the mixing valve on the manifold or can this be done via the thermostat?

    I’ve no idea!

  2. Pollowick

    Pollowick Well-Known Member

    On the incoming mixer valve.
  3. Sean Owens

    Sean Owens New Member

    Is that the mixer valve on the attached photo?

    Attached Files:

  4. Pollowick

    Pollowick Well-Known Member

    Yes, that is the mixer valve.
  5. Peterdevon

    Peterdevon Active Member

    Nice to see the pipes labelled as usual.
    Start at room temp but don't go as high a 45̊C, 40 is plenty
    Looks like you need a pipe thermometer
  6. rogerk101

    rogerk101 Well-Known Member

    If you ever run the underfloor water at 45 degrees you're likely to damage something ... usually cracked tiles around the edges where the warm material meets the unheated surfaces. Sometimes it's only the grout that cracks and hopefully those cracks will be under a skirting board. Unless your house is really lacking insulation you should never need the water to be warmer than 35 degrees. (Mine have never been above 30 but my house is really well insulated.)

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