Cross section of a Rointe Atria underfloor heating installation

Atria & Milos underfloor heating installation recommendations

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Author: Rointe


Rointe Atria and Milos electric underfloor heating systems are designed for easy and quick installation. See the do's and don'ts on how to install here >>


The Rointe Atria and Milos electric underfloor heating systems have been designed so that installation is quick and easy, but as with all electrical systems, certain procedures must be strictly followed. It is important to ensure that you have the correct heating mat(s) and size for the area you wish to heat and thoroughly read these recommendations about installation.

Atria & Milos underfloor installation recommendations

The installation of these underfloor heating systems is only recommended under ceramic, quarry or natural stone tiles. The maximum thermal resistance of the floor must not exceed 0.15 [m²K / W].

It is also possible (but not recommended) to install the heating element under floor finishes such as wood or vinyl by applying a self-levelling compound over the heating mat. You must ensure that all heating cables are completely covered with a minimum of 10 mm self-levelling compound. It is important that the levelling compound is suitable for use with underfloor heating.

Note that delicate floor finishes such as wood or vinyl have a maximum floor surface temperature of 27°C. This temperature must NOT be exceeded.

Rointe Atria and Milos underfloor heating mat installation example with levelling compound

Materials included in Atria/Milos underfloor kit

  • Atria / Milos heating mat
  • Installation manual

Additional items needed

  • Thermostat with floor sensor
  • 30mA residual current device (RCD)
  • Digital multi-meter for testing resistance of mat and sensor
  • Electrical housing, back box (at least 35mm deep) and junction boxes
  • Electrical trunking/conduit for housing power leads
  • Duct tape to secure floor sensor and loose wires
  • Scissors for trimming underfloor mat mesh
  • Electrical safety gloves

Atria & Milos underfloor installation do's & don'ts

Rointe atria and milos underfloor heating for ceramic or tiled floors

Atria/Milos installation do's

  • Read the installation manual carefully before starting. Consult our helpline or a competent professional if you are unsure how to proceed.
  • Ensure the system is tested before, during and after installation.
  • Plan your mat layout and installation so that any drilling after tiling (e.g. for sanitary ware) will not damage the wiring.
  • Maintain a minimum gap of 50mm between wire runs and from conductive parts such as water pipes.
  • Check that the mat is working, immediately before commencing tiling.
  • Take particular care when tiling not to dislodge or damage the heating wire e.g. from falling or sharp objects.
  • Wear gloves for electrical safety and to prevent irritation from the fibreglass mesh.
  • Ensure the end cap and manufactured joint are under a full bed adhesive or levelling compound and covered with a tile.
  • Ensure that a heat loss calculation has been carried out and heating requirements have been met if you are using the floor heating system as a primary source of heating.
  • Ensure that the heating mats are separated from other heat sources such as luminaires and chimneys.
  • Ensure that the maximum thermal resistance of the floor does not exceed 0.15 [m²K / W].
  • Ensure the control card at the back of the manual is completed and fixed at the main consumer unit along with any plans and electrical test records.
  • Contact us on 0203 321 5929 if you are unsure, have any questions or need help and advice.

Atria/Milos installation don'ts

  • Cut or shorten the heating element at any time.
  • Commence installation on a concrete floor that has not been fully cured.
  • Leave surplus matting rolled up under units or fixtures - USE THE CORRECT SIZE MAT.
  • Install the mat on irregular surfaces such as stairs or up walls.
  • Use staples to secure the the heating element to the subfloor.
  • Run the floor sensor wire or power lead over or under the heating element or close to other heat sources such as hot water pipes.
  • Connect two mats in series, only connect mats in parallel.
  • Commence tiling before testing the mat.
  • Switch on the installed mat until 8 days after fitting to allow the tile adhesive to dry completely.
  • Install the mat in temperatures less than 5°C.
  • Bend the heating cable under 25mm radius.
  • Use the heating system to dry out levelling compound or adhesive.
  • Tape over the end cap or manufactured joint.
  • Attempt a DIY repair if you damage the heating mat.
  • Do not proceed if you are not sure. Please call us on 0203 321 5929.

Please note this is not an extensive list, nor is this article the full instruction manual for Atria or Milos underfloor heating insulation. You MUST read the instruction manual carefully BEFORE any underfloor installation is carried out. 

All electrical connections must be undertaken by a certified electrician. All work must conform to current Electrical Regulations.

Download the Atria or Milos underfloor heating installation manual here:

Learn more about our range of electric heating systems including: radiatorstowel railsdomestic hot water heatersunderfloor heating and smart heating controls. Or shop now to find the right electric heating option for you.

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