Electric floor heating

  • Overview
  • Documents
  • FAQ
  • Related products
  • Articles
  • Case studies
  • Learning
  • Contact us

Turn on the comfort with electric floor heating

Feel great, the moment you step out of bed, all year round. With DEVI electric floor heating, you can upgrade comfort and convenience in your entire home. Installation is easy and cost-efficient, and the controller is intelligent and intuitive, so turn on the comfort.

Make it easy, make it DEVI

Save space, time, and installation costs. With DEVI, you get a proven system that makes everything easier for architects, installers, and users.

Home design is easy because you don't have to worry about water pipes and pumps. Installation is easy because you get a flexible system that is fast and straightforward to work with. And using the system is easy because you get intuitive controls and a quick warm-up time.

So, make it easy, make it DEVI.

The benefits of electric underfloor heating

Features and benefits

For any room in your home

For any type of flooring

Prevent slipping on wet tiles in bathrooms or kitchen

Electric heating is a good choice for low-energy houses

An invisible heat source

Fast-responding floor heating​

High durability and no maintenance​

Long lifetime with 20-year full warranty

The future is electric

With new legislation, electric heating can now be used for several different applications. DEVI gives you energy-efficient heating solutions that comply with EcoDesign. With no maintenance, a long product lifetime, and a full 20-year warranty, the future is truly electric.

Case stories

A tap or a turn and your home feels perfect

The only visible part of a DEVI system is also the most beautiful. With our selection of controls, you can get one that suits your home perfectly. Each one is easy and intuitive to use and comes with intelligent features.

Get on top of any type of project

Are you building a new home or renovating your existing home? Either way, DEVI makes it easy to design and install your project.

DEVI solutions can be utilized both as the primary heat source, and as an additional heating source for comfort heating. You can easily install it in every type of room on every type of floor.

Discover the market's easiest solutions

The system consists of three main components: Heating elements (cable, thin heating mat, or heating element)​, thermostat with air or underfloor temperature sensors, and accessories. All products are designed and produced according to the highest-ranking quality standards.

Installing DEVI? It's easy

DEVI systems are straightforward to install and don't require specific maintenance. To make it even easier, we have put together a collection of recommendations to consider when handling our products.

DOs and DON’Ts for Indoor Electric Heating Technical support for installers


Type Name Language Valid for Updated Download File type
Catalog Danfoss Product catalogue English Multiple 20.8 MB .pdf


Electric Heating

Total heating, also called primary heating, means that electric floor heating is used as the only source of heat in a house. Electric floor heating is an effective heating system that can easily heat up your house as the only heating source. The Electric total heating system is designed to cover total heat loss and provide full heating. 

Normally, DEVIflex™ / ECflex heating cables for indoor are placed in the lower part of a reinforced concrete layer with a maximum thickness of 5 cm. 

Underfloor heating relies on the heat produced being unrestricted. If it is restricted, it may cause “hot spots” and, at worst, discolor the floor. Things such as beanbags, mattresses laid directly on the floor may cause problems. Any object that allows air movement underneath it is OK. 

This depends on various factors, such as: 

  • What system has been installed and where (under tile or in slab)?
  • Type of screed that has been laid?
  • Depth of the floor screed? 

Warm-up time could be anything from 30 minutes for an indoor heating mat placed under tiles through to 5 – 7 (or more) hours for an in-slab storage system.  

Heating Bathrooms

An easy and clean solution such as a heating mat gives you possibility to leave an old floor without removing it and creating unnecessary mess. The thought of broken up floors and craftsmen running in and out of the house used to be enough for most people to simply drop the idea of having their feet and floors heated. 

Today, there is no need to shiver when thinking about floor heating. You are able to get a warm floor without going through the expenses, dirt, and fuss of having to break up the old floor. 

The heating mat is only between 2.3 mm and 4 mm thick, depending on type. It can therefore easily be fitted directly on to your existing floor, whether it is concrete, timber or even an old tiled or terrazzo surface, without needing to cut up the existing floor construction. 

The heating mat is installed within the thickness of the tile adhesives and, therefore, adds no significant height to the floor level. Consequently, there should be no need to reduce door heights, raise skirting boards, etc. 

Electric Heating Installation

The covering has to be flexible or have a flexible additive. Talk to your tiler for advice.

The adhesive bed has to be thick enough to cover the cables; generally 4-5mm is sufficient. 

We recommend that the adhesive used is allowed to dry/cure naturally and to follow manufacturer’s recommendations. Turning the floor system on too early can result in damage to the floor (to quick drying out). 

It is recommended that any screed be allowed to cure naturally, and this would also depend upon its thickness. Generally, the length of time from the screed being laid and the system being ready to switch on is sufficient for it to dry out. 

The required output heat can be anything from 40-150 W/m². It must be based on a detailed calculation of the room heat loss in W/m² from an architect, consulting engineer or your local DEVI / Danfoss office. 

The next step is to determine the heatable floor area heat. This means that the area covered by cupboards, bathtubs, lavatories, etc. has to be deducted from the total room area of a room. In order to ensure a quickly responding heating system, the total calculated output has to be increased by approx. 30%. 

The required output can now be found heat [W/m²] = 1.3 x room x room/heat. 

Locally, the output may be up to 2 times higher, e.g., in front of larger window areas. These rim zones are achieved by reducing the distance between the cables. 


The cost depends on the size of the room, available floor space, and whether the system is to be used as the only heating source or as a warm floor. 

A 5m² bathroom with shower would normally require a 4 m² heating mat and a DEVIreg™ / ECreg thermostat. For dimensioning of total heating requirement contact DEVI /Danfoss Electric Heating partner in your local area. 

Electric floor heating normally costs less in purchasing and installation than any other conventional heating system. The general rule is: the bigger installation area is, the lower the system price per square meter. 


DEVI / Danfoss electric floor heating is a safe solution. It is approved for use in houses, apartments and other facilities. 

Safety is ensured by the high quality, reliable cable construction, and installation in accordance to building standards. The heating conductor is insulated first by a layer of insulation, and then surrounded by a screen that is earthed. Finally, it is protected by an outer layer of insulation. 

The heating mat is water resistant, and features a safety screen under the outer sheath, which is connected to the electricity ground connection. Electric Heating system by Danfoss floor heating is manufactured according to the international IEC standards, ensuring that the customer is protected by the authoritative standards. 

In the last few years, there has been an increased focus on magnetic fields. There has been a lot of research within this area, but despite the large number of studies, there is no proof of health risk possibilities. Consequently, it is not possible to set a precise maximum limit to how much we can exposure ourselves to without causing health risks. 

In relation to suggested limits, our daily exposure values are very low. 

The table below shows measurements of the strength of magnetic fields in both electric heating cables in floor and other frequently used electric appliances. 

Unit Distance Value Distance  Value
DEVIflex®DSIG          6cm 16µT    100cm 0.8µT
DEVIflex®DTIP        6cm 0.04µT    100cm 0.04µT
DEVIflex®DSVF        6cm 5.5µT     100cm 0.16µT 
DEVIflex®DTVF      6cm     0.4µT         100cm 0.2µT
Flourecent lamp, 40 watt    6cm 73.2µT 30cm 3.3µT  
Transformer, 12V/25 watt  6cm 35.1µT 30cm 0.7µT
PC, in front of screen     6cm 0.9µT 30cm 0.1µT 
Shaver rechargeable      6cm 940µT     30cm 44µT 
Refrigerator, 160 watt     6cm 1.1µT  30cm 0.2µT 
Clock-radio    6cm 11.4µT  30cm 0.6µT 


As the table shows, the strength of the magnetic field around the heating cable is at the same level or lower as other electric appliances. 

Troubleshooting and Support

There are number of reasons why this could happen: 

  • Check that you have a supply (voltage) to the thermostat.
  • Check to make sure the thermostat is operating.
  • Check the settings on the thermostat.
  • Check the continuity and resistance of the mat.

These checks should be carried out by a qualified electrician

Yes, we recommend professional installers to help you find any fault and repair it. Contact us and we’ll appoint you to your nearest installer. 

Related products


DOs and DON’Ts for Indoor Electric Heating

DOs and DON’Ts for Indoor Electric Heating

Electric Heating is an energy-efficient and environmentally friendly floor heating solution. You can use it for either newly constructed or renovated homes.

Case studies

  • if (isSmallPicture) { Coburg’s First Passive House, Victoria Australia; } else if (isBigColumns) { Coburg’s First Passive House, Victoria Australia } else { Coburg’s First Passive House, Victoria Australia }
    Coburg’s First Passive House, Victoria Australia

    Home By Hutt, Melbourne Design Studios, and Grand Designs Australia designed and built the first Passive Home in the humble suburb of Coburg, Melbourne. 

  • if (isSmallPicture) { Electric heating in the world’s tallest timber building in Norway.; } else if (isBigColumns) { Electric heating in the world’s tallest timber building in Norway. } else { Electric heating in the world’s tallest timber building in Norway. }
    Electric heating in the world’s tallest timber building in Norway.

    It is officially the world's tallest timber building, at 280 ft tall. Mjøstårnet translates as “the tower of lake Mjøsa”. The building is named after Norway’s biggest lake, which it is located beside.

  • if (isSmallPicture) { Romantic surroundings in Lapland intensified by the comfort of electric heating.; } else if (isBigColumns) { Romantic surroundings in Lapland intensified by the comfort of electric heating. } else { Romantic surroundings in Lapland intensified by the comfort of electric heating. }
    Romantic surroundings in Lapland intensified by the comfort of electric heating.

    40 igloos - Aurora cabins – are located in the wintry forest. They are glass-roofed so that guests can wrap up in a blanket and enjoy the breathtaking views of the Milky Way, the North star and the Northern lights.


Danfoss learning - online training free of charge

Visit our Learning Center

Danfoss offers online training materials for technicians and designers working with electric heating. There are 6 e-lessons available free and on-demand through Danfoss Learning portal. For more information, register in our support section by following the link or find the overview of available relevant trainings in the table below.

Contact us

For further information, please contact us for technical support