Electric Underfloor Heating

Why Electric Floor Heating?

DEVI Electric underfloor heating works excellently under hard floor surfaces, without taking up any valuable floor space.

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

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

Application

Electric floor heating is ideal for bathrooms, ensuites and laundry rooms. It works amazingly under floor coverings such as marble, stone, slate and all varieties of tiles. It’s also fabulous 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.

Installation

The installation of an electric floor heating system is generally straight forward, 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 in any way.

Maintenance

Electric floor heating systems are virtually maintenance free, as long as they have been properly installed at the front end and there is no damage to the cables. If the cable damage is minor, it can often be easily fixed. Once they have been installed, good quality cables have a lifespan upwards of thirty years.

Cost

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

Thermostats

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


Electric Floor Heating Installation

Depending on the preference of the home owner and the application, these systems can be installed using loose cables or mats. There are several different systems that suit a range of design requirements:

Electric Heating Cables in SCREED BED

In screed heating consists of heating cables fixed on top of 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.

Because of this, these systems can raise the floor of an existing room by 30 mm in addition to the floor tile. The benefit of this system lies in its ability to hold the heat for a much longer period when compared to an adhesive system.

These systems tend to take up to 1.5 hours to heat up and give off heat for the same period once they have been turned off. Screed bed systems work well in areas that are irregularly shaped, although it is recommended that they are installed by a trained professional.

Electric Heating Cables in CONCRETE FLOOR SLAB

In slab heating consists of 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, in turn warming 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.

Electric Heating Cables in TILE ADHESIVE (Devimat)

Under 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. This 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.

The installation costs for these systems can be on the high side, but running costs have the potential to be quite low.

Under Floating Timber (Devicell)

Devicell is specifically designed for heating floating timber floors. The system consists of a heating cable that is fixed to an insulated panel which is specifically designed to spread the cable out at 100mm centres.

The panel’s polystyrene insulation ensures that the heat loss downwards is minimised and its aluminium surface ensures a uniform distribution of heat transfer to the floating timber floor.

Under Battened Timber

Under battened timber heating can be used in situations where the heating cables cannot be laid in concrete, a screed or levelling bed. The cables heat up the air cavity under the timber which in turn heats up the timber floor surface above to provide 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 penetrations into the floor at any time in the future.

This is not the preferred method for installing electric under floor heating because the floor surface is very slow to heat up and it reacts very slowly to requirement changes.

The efficiency of the heating can also be reduced unless great care is taken to prevent any air movement out of the heating cable void area, and the amount of heat available to the room is limited by the timber flooring. Despite the limitations, this method can be good when there are no other installation methods 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 (refer to the adjacent photo).

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.


DEVI


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.

Application:

  • Residential & Commercial
  • Indoor & Outdoor Environments
  • A popular option for homes including entertainment areas, kitchens, bathrooms, laundry rooms and bedrooms
  • Suitable for a number of different floor coverings including carpet, timber, tiles, stone, polished and tinted concrete etc.

Features/Benefits:

  • Luxurious heating that radiates upwards from the floor
  • High quality, European-made
  • Minimal energy consumption
  • Straight-forward installation
  • Intelligent floor sensing thermostats that ensure accurate temperature control and minimal energy use
  • Suitable for use under a variety of floor surfaces
  • Maintenance free and long-lasting
Models:
Deviflex range of cables
Devimat
Devicell
DEVI Heat Trace cables
DEVI thermostats and accessories
F-BOARD Insulation
Accessories
Application:
Residential & Commercial
Indoor & Outdoor Environments
A popular option for homes including entertainment areas, kitchens, bathrooms, laundry rooms and bedrooms
Suitable for a number of different floor coverings including carpet, timber, tiles, stone, polished and tinted concrete etc.
Features/Benefits
Luxurious heating that radiates upwards from the floor
High quality, European-made
Minimal energy consumption
Straight-forward installation
Intelligent floor sensing thermostats that ensure accurate temperature control and minimal energy use
Suitable for use under a variety of floor surfaces
Maintenance free and long-lasting

DEVI’s intelligent electric floor heating systems are ideal for domestic, commercial and industrial projects. These include the building or renovation of houses, schools, care centres, restaurants, ski lodges, freezers, cold stores, workshops and factories, as well as a number of agricultural applications and the de-icing of outdoor areas.

Floor heating can be installed into new slabs or on top of existing floors. You don’t lose any valuable floor or wall space and there are no grills, vents or consoles to spoil your decor. 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 heaters (see Accessories in Product Catalogue), time and temperature control thermostats (see Thermostats in Product Catalogue), and specialised industrial heating products.


The DeviregTouch Thermostat

Intuitive, user-friendly, easy to install, energy saving & sleek

The DeviregTouch Thermostat is great for home owners that are currently using or considering floor heating. It was designed and developed based on consumer feedback, with a sleek and modern appearance and a user-friendly touchscreen. It is easy to install and is the most intuitive timer thermostat on the market today.

DOWNLOADS:

BROCHURES, SPEC-SHEETS, INSTALLATION GUIDES


Electric Floor Heating Insulation

F-board 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.

Features

  • 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

F-Board is glued (using a staggered joint layout) to the concrete or timber floor using typical tile adhesives (non-solvent based) that are suited to electrically heated floors.

  • 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.

Devicell

Devicell Dry insulation panels are 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 Deviflex 10T heating cables.

DOWNLOADS:

BROCHURES, SPEC-SHEETS, INSTALLATION GUIDES