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How To Install Underfloor Heating Under Tiles

Date Published: . By Roma Heating
installing electric underfloor heating under tiles

Installing Electric Underfloor Heating Under Tiles

Electric underfloor heating is a popular choice for many homeowners due to its efficiency, comfort, and versatility. It is an ideal heating solution for tiles, as it provides a warm and comfortable flooring surface that is easy to install and maintain. Installing electric underfloor heating under tiles is a straightforward process, but there are a few key steps to follow to ensure that it is done correctly. In this article, we will provide a comprehensive guide on how to install electric underfloor heating under tiles.

Tools and Materials

Before you start installing electric underfloor heating under tiles, you need to gather all the tools and materials that you will need. The following is a list of the tools and materials that you will need:

  • Electric underfloor heating mat
  • Thermostat
  • Floor tile adhesive
  • Tile cutter
  • Trowel
  • Spirit level
  • Measuring tape
  • Insulation board
  • Electrician’s tools (such as wire stripper, multimeter, and screwdriver)
  • Tiles


Before you start installing the electric underfloor heating, you need to make sure that the floor is clean, level, and dry. This is because the heating mat needs to be in close contact with the floor to ensure that it heats up evenly. If there are any cracks or holes in the floor, you should fill them with floor tile adhesive to create a smooth surface. Next, you need to measure the area where you will be installing the heating mat and cut the insulation board to fit the area. The insulation board should be placed on top of the floor to provide an even surface for the heating mat to lie on.

Preparation for installing underfloor heating under tiles

Installing the Heating Mat

The first step in installing the heating mat is to roll it out on the insulation board. You should make sure that the heating mat is positioned so that the heating element is facing up. The Roma Heating mats are self-adhesive and can be secured in place by pressing them down firmly onto the insulation. Once the heating mat is in place, you need to connect it to the thermostat. This is usually done by using the black lead that comes on the mat.

The lead should be connected to the thermostat, and the thermostat should be connected to the electricity supply. Additionally, the thermostat comes with a floor probe. The probe should be placed evenly between two heating cables to give you the most accurate temperature reading. And connected to the thermostat into the remaining slots. Before connecting everything up we would advise doing a continuity test simply to make sure no damage was done during the installation process.

Laying the Tiles

Once the heating mat & floor probe are in place and connected to the thermostat, you can start laying the tiles. You should start by spreading the tile adhesive on the floor using a trowel taking care to not damage the heating element. A 10mm bed of self-leveling can be laid first to protect the heating elements and make a flat smooth surface for tilling. The tiles should then be placed on the adhesive and pressed down firmly. You should use a spirit level to make sure that the tiles are level and that there are no gaps between them. If you need to cut tiles to fit around the edges of the room, you can use a tile cutter to do this. You should make sure that the cut tiles are positioned so that they are flush with the other tiles.

Testing the System

Once the tiles are in place, you need to test the electric underfloor heating system to make sure that it is working correctly. You should turn on the thermostat and let the heating mat heat up only once the self-leveling and tile adhesive is dry. If everything is working correctly, the heating mat should heat up evenly, and the tiles should be warm to the touch.

Testing the system once installed


Installing electric underfloor heating under tiles is a straightforward process that can be completed by most DIY enthusiasts. However, if you are not confident in your ability to install the system, you should consider hiring a professional electrician.

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