Laying electrical underfloor heating - that's how it works

Electric underfloor heating can in many cases be a valuable additional or demand heating. How to install these heaters, which models are particularly easy to install, and what to pay attention to when installing, read in this post.

Selection of the right model

Basically, it makes sense to choose electrical floor heaters, which are ready mounted on mats. This makes laying very easy, and also eliminates misalignment.

Power of heating

For the selection of the right heating is important to determine the necessary performance. On the one hand, the generated heat should be sufficient to heat the room as additional heating.

On the other hand, depending on the surrounding materials, certain maximum temperatures for heating may not be exceeded. Both must be weighed against each other.

Underbody as power limitation

For wooden subfloors, the power of the heater may not exceed 100 W / m². The maximum surface temperature of the heater must not exceed 27° C.

This means, however, that the large temperature differences are usually compensated somewhat more slowly.

Flooring as performance limitation

For certain floor coverings, the heating temperatures must also not exceed 27° C. These are the following coverings:

  • parquet
  • laminate
  • all kinds of vinyl
  • carpeting

Here, too, only heaters with a capacity of up to 100 W / m² are permitted.

Thermal resistance of the soil

Cheap materials are for the subsoil screed and as flooring tiles or natural stone. They have a high heat transfer capacity.

Heaters with an output of up to 150 W / m² can also be installed here. The maximum surface temperature can easily exceed 27° C.

Coverings such as carpets or parquet are not quite as cheap as their heat transfer capacity is often 10 times lower. This also means much less heat from the underfloor heating in the room.

Underfloor heating and wooden floors

Solid wood floors are extremely problematic in combination with underfloor heating. The wood may warp, crack and will be severely damaged in the long run.

Laying electrical underfloor heating - step by step

  • Heating mats
  • if necessary, ground leveling compound
  • screed if required (depending on manufacturer's instructions for laying and covering)
  • Multi meter
  • insulation tester
  • suitable tool for the production of a groove

1. Preparation

Mark the heating surface on the floor, take into account the later locations of furniture and built-in appliances. Heating mats should only rest in the open ground area. Calculate the mat requirement and the number of required thermostats (usually no more than 2 mats per thermostat). Before fitting, test the mats with the insulation measuring device. The insulation value must be greater than 10 M? his.

2. Lay the floor sensor and mains cable

Make a groove in the wall, let the groove for the sensor run approx. 50 cm into the room. Observe the laying instructions for the cables (line curvature).

3. Lay the mats

Install the thermostat correctly (50 cm away from the window and door). Start at the thermostat power supply, roll out the mats, remove the protective foil, stick on. Cables should never cross or touch each other! Repeat the resistance measurement after installation (insulation measuring device)

4. Fill with mats

Press the mats tightly and fill with suitable material according to the manufacturer's instructions. Follow instructions for covering the heating cables. Afterwards, the floor covering can be laid.

Tips & Tricks

A good possibility can also be to operate the electric underfloor heating as additional heating with own electricity from the photovoltaic system. Thus, transition times can run at extremely low cost, and the main heating system can remain out of service.

Video Board: How to Lay and Install Underfloor Heating Mats Prior to Tiling - Tile Mountain