Underfloor Heating Mill Tile Studio

Underfloor Heating

To add that bit of luxury to your floor, why not incorporate an underfloor heating system? Underfloor heating goes way back to the romans some 2000 years ago. Thankfully today the systems are a little more advanced and offer a cost effective and reliable heating source. We have systems that keep the floor warm to the touch to keep the chill of your feet, essential in the cold winter months (150w/sqm).  We also offer a 200w/sqm system that can heat a room as a sole heat source, without the need for radiators, perfect for sunrooms or conservatories.

As with our adhesives, we have chosen an underfloor heating supplier who is local to our showroom. ‘Varme Floor Heating Systems’ are based in Nottingham and we are proud to support another local business. This is not the only reason we choose to work alongside them, thankfully they offer an outstanding product that comes with a lifetime guarantee!

The two most common underfloor heating systems that are used underneath tiled floor are ‘cable matt systems’ or ‘loose cable systems’.

Cable matt systems

These are  the most common systems due to the ease and speed of installation. The matt is simply rolled out on to the floor area and the self-adhesive back sticks to the floor substrate. The matts are 0.5mertes wide. At the end of the matt the electric wire is simply feed into the thermostat (please be aware that any electrical connections must be carried out by a qualified electrician in accordance with current wiring regulations).

The touchscreen thermostat is simple to use and features a factory set 7-day programme so it is ready to use straight out of the box. The controls are simple to use so you can adjust this at any time, depending how cold your feet get! The floor is then ready for tiling (see our handy step by step installation guide at the bottom of the page)

All cable matt systems come complete with the following:

  • twin-core heating cable on a fibreglass mesh roll.
  • Floor primer & roller (to assist with adhering the matt to floor).
  • 7-day programmable digital thermostat with built in timer.
  • Full & detailed installation instructions with helpline number

Loose Cable systems

Loose cable systems are the perfect option for smaller areas where there are a few obstacles to contend with, like toilets and pedestals.

The wire is rolled of the drum and taped down, with the tape provided. The built in return in the cable means that you only have to connect it to the mains from one end. The end of the wire is then feed into the thermostat and wired in ready to provide your floor with a lifetime of heat and comfort.

The heating cable

The cable is constructed using the latest design heating cable with an earth screen and a double insulation layer, make it very hard wearing. The cable also contains a built in return, meaning you only have to connect it to the mains from one end.


With today’s high energy costs it is very important to ensure that your underfloor heating system is performing to is highest potential to save energy and money, and also heat your floor in the quickest possible time. To do this we recommend that you install energy saving tile backer/insulation boards. The boards we sell are 1.2metres by 0.6metres, each boards covers 0.72m 2. meaning they cover a big area quickly and are very easy to handle weighing as little as 2.36kg per board. They are simply cut with a utility knife or hand saw and stuck down with flexible adhesive (concrete) or screws and washers (timber).

Using insulation boards means significantly less heat will be lost through the floor, and the heat will rise resulting in a more energy efficient and faster heating floor. The boards come in the following thicknesses: 6mm, 10mm, 12.5mm, 20mm, 30mm, 40mm, 50mm and 60mm.


Where floor height is an issue and the floor can’t accommodate an insulation board, we can provide a revolutionary insulating acrylic primer, which has been specifically designed to help reduce the carbon footprint of underfloor heating systems and has been shown to help reduce energy loss by 20%.

(a test was carried out on a concrete subfloor, the most challenging floor construction for an underfloor heating system, and using the same energy output a temperature of +2 o C was recorded after applying a single application of ‘Therma-Coat’)

The primer is applied with a brush or roller directly to the floor and acts as a primer, boding agent and insulator. The underfloor heating system applied on top. (An application of ‘Therma-Coat’ can also be applied under insulation boards as the boards will not retain 100% of the upwards).

The product uses the latest ‘ceramic bead’ technology leaving a layer of spheres on the surface of the floor which reflect heat upwards. The product can also be used on walls and ceilings to reduce energy loss. ‘Therma-Coat’ comes in 1litre bottle and will give coverage of up 16m 2.

Basic Installation process (please use manufacturers guide when fitting)

    • Ensure the floor is clean, flat and free from dust and debris.
    • Test the resistance of the matt using a multi-metre and record the result on the data sheet provided
    • Using the roller (provided) prime the floor with the primer (also provided)
    • Underfloor Heating Mill Tile Studio
    • (for a concrete sub-floor) Fix insulation boards using ‘Granfix Fast-set Flex’, using a suitable notched trowel, ensuring the boards are fully in contact with the adhesive
    • (for a timber sub-floor) – Fix insulation boards using ‘Granfix Fast-set Flex’, using a suitable notched trowel, ensuring the boards are fully in contact with the adhesive. Then screw insulation boards using our screws and washers – screws will pull straight through the boards if washers are not used.
    • Prime the boards before laying the matt.
    • Lay the matt or loose wire in accordance with the manufacturer’s instructions, testing the matt’s resistance at periodic intervals and recording the readings. Make sure the size of the matt fits into the area being tiled, as the cable cannot be cut and returns are not accepted once the system has been installed. Once everything is positioned correctly and you have ensured that the end of the wire is in a position where it can easily be fitted into the thermostat, you are now ready to stick down the matt.
    • Fit the temperature probe.  To do this, cut a channel in the insulation board, in between the wires and fix the conduit (provided). This is done by using a utility knife (be careful of the wires when using a sharp knife).
    • Feed the probe into the conduit and then cover the hole with the adhesive to make sure it doesn’t pop out. Leave the probe ready for the electrician to connect into the thermostat. It is always a good idea to have a roll of gaffer tape handy when fitting a underfloor heating system.
    • Test the resistance
    • Having installed lots of underfloor heating systems over the years, we highly recommend using a flexible levelling compound to cover the cables. This ensures that the cables can’t be damaged during tiling, when using a metal trowel, you will have a flat surface to tile meaning there should be no voids under the tile and thirdly, in the unlikely event of a problem occurring with the matt, you can remove a tile without damage the underfloor heating system.
    • Tile the floor with one of our flexible adhesive from Granfix depending on the size of the tile.
    • Grout with one of our flexible grouts from Granfix, depending on the size of the joint and desired finish.
    • Enjoy a luxury heated floor for years to come!

Typical construction of our underfloor heating systems

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