Electric Under Floor Heating Overview

Electric underfloor heating is ideal under hard floor surfaces, without compromising on floor height.

One of the biggest advantages of floor heating for bathrooms is that heat is not dispersed, like it is with convection heating.  Electric floor heating also reduces the amount of dust particles in the air, a great relief to allergy and asthma sufferers.

Our thermostats allow you to heat specific rooms independently and can be programmed according to your lifestyle needs. Comfort isn’t the only reason to choose electric underfloor heating. Electric floor heating also offers flexibility, durability and minimal energy consumption, along with a warranty that is second to none.

Features & Benefits


Electric underfloor heating is ideal for bathrooms, ensuites and laundry rooms.  This type of underfloor heating works well under floor coverings such as marble, stone, slate and all varieties of tiles.  However, it may also be used under carpet and timber floors.  Please note that if used under carpet, cables must be laid in a sand and cement bed or levelling screed.


The installation of an electric underfloor heating system is generally straightforward, although the level of complexity can vary depending on the system. It is important that care is taken during installation to avoid cutting or damaging the cable.


Electric underfloor heating systems are virtually maintenance free, as long as they have been properly installed and there is no damage to the cables. Minor damages to the cable are easily fixed and a good quality cable for underfloor heating can last up to thirty years.


Electric underfloor heating is a cost-effective solution when used properly.  Although the  upfront cost of an electric system can be much less than that of a hydronic under floor heating system, hydronic systems have lower running costs.


A high-quality thermostat is another factor that helps to boost efficiency.  It allows you to heat specific rooms independently as you can program the thermostat according to your needs and lifestyle.

You can select from manual or programmable thermostats or incorporate a mix of the two if you prefer.  A good quality thermostat will allow for greater control over temperature, zoning and timing, making it easy for you to make the most out of your floor heating system.

Heating Systems Matrix

Floor Construction Building Type Floor Covering Underfloor Heating type
Electric (heating cables)
In-Slab In-Screed Under-Tile
Hydronic (heating pipes)
In-Slab In-Screed Under-Tile


New Floor Construction
Floating Timber
Battened Timber

Lightweight Suspended

Floating Timber
Battened Timber


Existing Floor Structure
Floating Timber
Battened Timber

× = not appropriate

√ = appropriate

* The space in between the battens needs to be filled with screed

For your perfect underfloor heating solution installation, contact our specialists!

Bathroom Floor Heating

The Benefits of Bathroom Underfloor Heating

Do you hate getting out of the shower and feeling chilled again as soon as you step onto the cold tiles? With good quality underfloor heating, you won’t have to experience this comfort any longer!

Underfloor heating systems are ideal for bathrooms (in addition to kitchens and open entertainment areas etc.) and work well under almost any hard floor surface. Bathroom floor heating radiates up through the floor and provides comfort underfoot while gently managing the room temperature.

Bathrooms and ensuites are particularly popular locations within a home for floor heating because:

  • Total comfort heating
  • Minimal energy consumption
  • Maintenance free
  • Cost effective
  • No ducts, radiators or vents
  • Hidden from view and does not take up valuable space
  • Can be applied under almost all hard surfaces
  • Silent and safe

Electric Floor Heating Installation

Cables in SCREED BED

In screed underfloor heating consists of heating cables that fixed under the floor structure with a light steel mesh or fixing strips. The cables are embedded in a sand and cement bed which becomes heated, warming the floor covering. In screed heating is considered a direct acting system, although it does offer some heat storage.

This system is the best option for rooms that have some flexibility in the height of the floor. It is typically embedded in 20-30 mm of screed, usually at the time of construction.

Due to the height of the screed, these systems can raise the floor by 30 mm in addition to the floor tile. However, the benefit of this system lies in its ability to hold the heat for a much longer period when compared to an adhesive underfloor heating system.

In screed systems tend to take up to 30-45 minutes to heat up and give off heat for the same period once they have been turned off.  Screed bed systems are a very good option for areas that are irregularly shaped, but should be installed by a trained professional.


In slab underfloor heating consists of a heating cable that is typically fixed to the top layer of the slab reinforcement, prior to the slab being poured. The heating cables heat up the slab and then warms the floor covering above. Cables are laid on the top mesh in about 30-40 mm of concrete and run during off-peak hours to cut energy costs and maximise the efficiency of the system.

As a storage system, in peak hours it runs on energy that has been accumulated during off-peak hours. This system is usually used in new construction before the slab is laid.

Under Tile Heating

Underfloor tile heating consists of a thin heating cable that is pre-laid on a self-adhesive fibreglass mesh. It sits in the glue or levelling screed which then becomes heated and warms the floor covering.

Cables can be placed in a tile adhesive of at least 5–15 mm depending on the design requirements of the room and the personal preference of the home owner. Under tile heating is an ideal option for retrofitting and new construction projects.

This “on-demand” system is quick to respond to changes in the thermostatic reading. Located immediately under the heated surface, it tends to be the fastest floor heating system on the market.

Under Floating Timber

We recommended two options for underfloor heating installation for timber floors:

The first uses a lower wattage heating cable that is pre laid on a self-adhesive fibre glass mesh.   The mesh is then placed in a 10-12mm self-levelling bed and the timber floor installed on top.

This floor heating system is the best option during renovations when you may have limited floor height, but can also be used in new builds.

The second uses a lower wattage in screed heating cable that is fixed to the floor structure with light steel mesh or fixing strips.  The cable is then embedded in a 20-30mm sand cement bed and the timber floor installed on top.

Under Battened Timber

Under battened timber floor heating can be used in situations where the heating cables cannot be laid in concrete, a screed or a levelling bed. The cables heat up the air cavity under the timber which in turn heats up the timber floor surface and then provides heat into the room.

Bulk thermal insulation is required under the heating cables to minimise downward heat losses. A 30mm air gap is mandatory to ensure that the heating cables are well clear of nailing or other potential future damage.

This is not the preferred method for installing electric under floor heating as the floor surface is very slow to heat up.  The heating efficiency can also be compromised with poor insulation in the cable void area, or if the heat available in the room is limited to the floor heating.  Despite the limitations, this method remains effective if no other options are available.

For under battened timber floor heating that is placed on top of an existing floor, insulation is placed between the battens so that heat is not lost downwards. The cables are then laid on the insulation, which is attached to a light steel mesh.  This maintains the cable spacing with an air gap of at least 30mm between the heating cables and the timber floor above them.

The timber flooring can then be nailed down to the battens, although care needs to be taken to ensure that nails do not penetrate the heated area. Cables should only pass through battens at their ends and nailing must stay away from this area.

Alternatively, if there is an existing timber floor and access is available from below, the heating cables can be attached to a light steel mesh which is fastened between the floor joists.

The heating cables are positioned no less than 30mm below the under-side of the floor boards with faced insulation installed directly below the cables.

A thermostat floor sensor must be installed under the timber floor. It is essential that the thermostat chosen can be set to limit the floor surface temperature to the maximum value that is appropriate for the type of timber floor being installed, in accordance with the timber floor manufacturer’s specifications.

Please note that when battens are required, then it is preferred the heating cables laid in a screed bed that can fill between the battens finished off to the top of the battens. This will increase efficiency and reduce the heat up time significantly.

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Electric Floor Heating

In October 2018, we were proud to advise the launch of our own brand of “Devex Systems” high quality cables, mats, thermostats and gas boilers. As an Australian company with 40 years experience, we are thrilled to continue to meet your needs in an increasingly efficient manner.

Through our own branded products, we are able to better control our product lines for you. In addition, we now have access to various European suppliers that will enable us to deliver innovative new technologies that are appropriate for our Australian market.

Devex Systems cables and mats have hand-made terminations ensuring higher quality and less susceptibility to termination faults. Having our own brand of cables and mats means that we can better deliver on large projects with short notice periods. The thermostats are user-friendly and specifically designed for Australian households and commercial buildings.

In terms of quality, these products are better than or equivalent to the ones we are currently providing, thereby maintaining our commitment to offer high quality products. We have sourced the best available European made cables, to ensure that we can locally manufacture the quality you have come to expect from us. The in house fabrication of cables and mats enhances our ability to pursue our mission of customer service excellence.

Learn more from our launch article.

Thin Heating Mats (c/w Single Cold Tail)

Devex Systems’ X mat™ MG-150 electric floor heating mat is only 3.5mm thick and uses a twin conducting heating cable for ease of installation, with very low EMF. It can be easily installed directly over concrete, fibre cement sheet or F-board insulation and into thin adhe- sive beds or floor levelling compounds. This means there is minimal increase in the floor height. The system is best utilised on a “time of use” tariff as it is quick to come to the desired temperature. The X mat is 500mm wide and come with a single 3m cold tail. The cables comply with IEC60800:2009.

We recommend the use of F-Board Insulation with electric floor heat- ing to improve warm up times and reduce running costs.

  • 20 year warranty
  • Output power based on 230 volts
  • Operating Temperature Range: -30°C to +80°C
  • Minimum Temperature during Installation: -5°C
  • Self adhesive mesh sticks to any clean substrate

Product Info

In Screed Heating Cable (c/w Single Cold Tail)

Devex Systems’ X cable™ CK 17 electric floor heating cable uses a twin conducting heating cable for ease of installation. This flexible cable made with fluoro-polymer and durable PVC outer sheath can be easily installed directly on a structural slab, fibre cement sheet, or F-Board insulation and into 20-25mm screed bed. This system best operates on a “time of use” tariff as it is quick to come to the desired temperature. The X cable is rated at 17 watts per meter and comes with a 3m single cold tail. The cables comply with IEC60800:2009.

We recommend the use of F-Board Insulation with electric floor heating to improve warm up times and reduce running costs.

  • 20 year warranty
  • Output power based on 230 volts
  • Maximum Operating Temperature: +70°C

Product Info

In Slab Electric Heating Cable (c/w Single Cold Tail)

Devex Systems’ X cable™ CT 30 electric floor heating cable can be installed into concrete slab under a wide range of floor coverings. The CT-30 has a very low EMF and its single cold tail makes it easy to install. The CT-30 is most suited to be connected to an “Off-Peak” or “Time of Use” tariff as an in-slab storage heating system. This cable’s steel armor and multiple layers of conductor insulation make it extremely durable and also able to be used for snow melting. The cable is rated to 30 watts per meter and it comes with a single 3m cold tail.

We recommend the use of Extruded Polystyrene (XPS) Insulation with electric in-slab heating to improve warm up times and reduce running costs.

  • 20 year warranty
  • Output power based on 230 volts
  • Maximum Operating Temperature: +70°C

Product Info


Intelligent Electric Floor Heating that gives cost-effective, natural and lasting warmth.

DEVI is a European-made brand of intelligent electric floor heating systems, that offers a full range of high performing, long-lasting cables, mats and thermostats. DEVI sets the bar high as one of the most respected names in electric floor heating and a global leader in heating solutions.

Underfloor heating means any room can be designed with elegant simplicity. These electric radiant floor heating systems are recognised around the world as safe, silent and very comfortable, providing practical luxury in any room.

DEVI is the only underfloor heating manufacturer that develops, manufactures and markets complete systems containing heating cables and thermostats.

Consequently, there is complete harmony between the components of our heating systems, which means high performance, greater comfort, optimum reliability and usability, alongside low energy consumption.

DEVI’s intelligent electric floor heating systems are ideal for domestic, commercial and industrial projects. Having underfloor heating means any room can be designed with elegant simplicity.

These radiant heating systems are recognised around the world as safe, silent and very comfortable, providing practical luxury in any room. DEVI also supplies a number of accessory items including mirror and time and temperature control thermostats and specialised industrial heating products.

To learn more please visit our catalogue.

Electric Floor Heating Insulation

Floor Heating Insulation

F-Board is designed to be used beneath floor heating systems to minimise downward heat loss and aid in faster warm-up times.

Without the use of F-Board insulation, some of the energy generated from the heating elements travels downwards into the floor below, leaving less heat available to warm the tiles.

F-Board insulation is of particular importance in small applications like bathrooms, ensuites, and powder rooms because these areas usually require “faster” warm-up times, higher floor temperatures (than larger, general living areas) and are often occupied for only short periods of time.

F-Board insulation ensures energy savings, improved comfort and quicker warm-up times.


High water resistance
High insulation value
High compressive strength
Very light weight
Easy to install

F-Board is designed to be used beneath electric floor heating systems and it can be placed in direct contact with underfloor heating cables and mats.

F-Board is made from high grade extruded polystyrene with a top and bottom surface finish of a polymer cement filler material that is reinforced with fibreglass mesh. F-Board 6mm has an R value of 0.16 and F-Board 10mm has an R value of 0.20.

Installing F-Board

The floor surface must be a clean, dry, dust-free, smooth flat surface.
Plaster board jointing tape is recommended for all joints.
Where required, the water-proofing membrane may be placed below or on top of the F-Board insulation layer.
The heating elements are then placed directly on the F-Board and the tiler continues the floor tiling process normally.
The heating elements can be in a screed bed or glue bed/levelling compound, based on the heating design selected.

Insulation Panel

Insulation Panel recommended for use with electric floor heating under manufactured floating timber floors.

The panels have a polystyrene insulation that ensures downward heat loss is minimised, while the aluminium surface ensures a uniform distribution of heat transfer to the timber floor.

Insulation: 12mm fire retardant EPS. R value is 0.33 Each panel is 1.0m x 0.5m.

These panels are used in conjunction with 10T heating cables.

Quick Heat

Quick Heat is a combination of grooved aluminium plates where heating pipes are inserted, and XPS insulation. Because the pipes are installed directly beneath the floor finish, it is the fastest way to bring the floor up the temperature using hydronic heating.

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