Frequently Asked Questions (FAQs)

Question 1: How do electric floor-warming/radiant heating systems work?

These electric floor-warming systems are installed directly below the flooring surface and are then connected electrically to an RCD/GFCI protected power source. The heating cable transfers heat to the floor surface by radiation, providing evenly distributed heat in the room.

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Question 2: What makes radiant heat more effective than other conventional heating systems?

Conventional forced air heating systems require more heat in order to warm the zones close to the floor because most of the hot air is naturally concentrated at the ceiling level.

Domoteck resistance wiring is more effective than conventional forced air systems because it creates a radiator effect in the floor. The radiant heat produced provides a more comfortable environment by:

  1. Heating from the floor level up
  2. Radiating heat to objects and people in the room
  3. Not circulating pollutants
  4. Not drying the air
heat circulation
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Question 3: Can electric radiant heating systems be used as the only heat source in a room?

Floor warming systems can be used as the only heat source in the room. Heat comes from the floor and spreads upwards throughout the room, providing pleasant warmth (see question 1 and 2).

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Question 4: Under what kind of floor covering is floor heating recommended?

Domoteck mats made of a double insulated heating cable woven into a textile mesh are recommended to install as wet installation directly under tiles, marble or natural stones.
Domoteck aluminum mats are recommended to install as dry installation under parquet, laminates or other wooden flooring.
We recommend working with professional flooring installers to make sure proper materials are used and proper installation techniques are followed.

Floor Covering Thickness Max Value W/M.K.(thermal conductivity)
Tiles max. 30mm 1.00
Parquet max. 16mm 0.14
Carpet max. 20mm 0.09
PVC max. 10mm 0.23
Cork max. 10mm 0.08

For more details, refer to the product page or installation manual.

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Question 5: Is electric floor warming safe?

All Domoteck floor heating mats are manufactured in accordance to national and international standards including UL, CSA, CSTB, VDE, SEMKO… They are produced to the highest standards of quality at our factory, which is ISO 9002 certified.

The heating cables are sheathed (ground protected) and MUST BE CONNECTED to an RCD/GFCI (Ground Fault Circuit Interrupt) to protect against fire hazards, electric shock, etc.

All electrical connections for the floor warming system and controls should be made by a qualified electrician in accordance with the Domoteck installation manual, the National Electrical Codes, and the Local Electrical Codes.

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Question 6: Is the floor heating system fragile?

A floor heating system is not fragile. The heating cable is double insulated, one mechanical insulation and one electrical insulation, making it very resistant. Because it is integrated into the floor, it is very unlikely that damage occurs after installation.
However, it is completely forbidden to drill through any area covered by the heating mat/ cable.

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Question 7: Is the floor heating system electromagnetically safe?

All Domoteck products are tested for EMF (electromagnetic field), and comply with the highest safety standards.

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Question 8: How should the sub floor be prepared?

The sub floor should be prepared as for any conventional floor covering installation in accordance with all applicable standards. It should be clean of all debris and sharp edges/objects that might damage the element. Loose boards should be repaired and all gaps should be filled to assure that the mat is installed over a smooth and even surface.
To improve efficiency, Domoteck recommends using insulation boards for installation, to avoid heat loss down in the sub-floor (see explanation question 9 below).

All components must withstand 80°C, must include agents (such as acrylic) to insure flexibility, should not be installed at temperature lower than +5°C. Always follow the glue manufactures instructions.
(For US: when installing tile or stone, we highly recommend Tile Council of North America (TCNA) guidelines or ANSI specifications as a minimum standard of installation. We also recommend latex or modified epoxy modified mortar and grout, instead of water-based multi-purpose materials.)

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Question 9: What types of areas can floor warming systems be placed in? Are there any limitations?

Domoteck floor warming systems can be placed in any room where heat is needed. It can be used over plywood subfloors, concrete backer boards, and concrete slabs. However, the floor heating system will be most efficient over well-insulated subfloors (see question 8 above).

Example: When a floor warming system is installed, the heat is conducted up through the flooring materials as well as downward into the subfloor. If the subfloor is conductive, like a concrete slab, it will absorb a considerable amount of the heat energy and it will take longer for the floor to reach an equilibrium temperature. If the subfloor is wood, which has insulating qualities, more of the heat will be conducted up through to thinset and the tiles. Therefore, by installing a heat barrier (insulation) over the concrete, you will help to increase the efficiency of the electric floor-warming system. The insulation should provide a suitable substrate for a quality tile installation and should meet TCA Guidelines. (Some commonly used insulating materials are plywood, cork, etc.)

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Question 10: Does a floor warming system need maintenance?

Domoteck floor warming systems are maintenance free, guaranteed by a 10-year limited product warranty, and are designed to safely operate in accordance to the life-span of the application in which they are installed.

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Question 11: Can a floor warming system ever become too hot?

All Domoteck electric floor warming systems are provided with a floor sensor that controls the floor temperature and avoids overheating. The floor temperature should not exceed 27°C (81°F) according to international standards.

Floor warming systems for ceramic tile, stone, wall-to-wall carpeting, and parquet/laminate floors should only be installed in OPEN areas. It should never be placed under items that will be fixed to or sit flush with the floor surface. The heat MUST BE ALLOWED TO DISSIPATE INTO THE AIR. SECTIONS IN WHICH HEAT IS TRAPPED MAY BECOME EXCESSIVLY HOT. All furniture placed over the system must be 10cm (4”) above the floor to allow air movement.

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Question 12: How is the temperature controlled?

Domoteck thermostat controls floor and room temperature. The use of a thermostat prevents the floor from overheating and reaching too high an electricity consumption. The floor temperature is a function of the set temperature chosen in your thermostat; it can vary from one room to another. The thermostat enables you to control the room/floor temperature according to your needs and preferences.
Domoteck thermostat controls the operation of the radiant heating system and adjusts its use according to the actual room/floor temperature, detected by a floor sensor, installed between resistant wires in the floor, or by a room sensor, placed into the thermostat (or by both). It is also possible to use a CU-510 Domoteck limiter that limits the floor temperature and prevents the system from overheating.

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Question 13: How many mats can be connected to the same thermostat?

It is possible to install up to 3 mats in parallel to the same thermostat as long as the amperage does not exceed 16A.

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Question 14: How long does it take for the floor to be warm?

It depends on the construction of the building, the heat loss and the insulation of the floor. Approximately between 15 and 45 minutes for a floor warming system, but more time for a heating system, installed deeper in the sub-floor.

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Question 15: How do I figure out what areas to heat?

The heat produced by the Domoteck resistance wiring must be placed in OPEN areas where the heat will be allowed to dissipate into the air. It is extremely important not to trap the heat (as discussed in the answer to question 11).

In most installations approximately 85-90% of the actual open floor space will be covered in order to heat all of the walkways and key areas in the room. Small margins of unheated space are usually left along the walls (30-50cm). Therefore, it is usually most accurate to calculate the total open floor space and then multiply that number by 0.90. This will be an approximation of the total area that will be covered by the radiant heating system. However, before purchasing your system, it is very important to accurately calculate the size of each element. See attachment.

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Question 16: Do the mats come in standard sizes or are they custom made for each job?

Domoteck manufactures heating elements in different widths: 30cm/1’ (for bathroom), 40cm/1’6” (for kitchen and small rooms), 50cm/2’ (standard size), 75 cm/ 2 1/2’ (for large areas like living room). Length can be between 2m and 16m (2, 4, 6…16)/ 6ft to 52ft.

It is possible to customize most of Domoteck mats, (except Fix Size mats): you can cut the textile mesh (DO NOT CUT THE HEATING CABLE) to overcome obstacles and adapt to the shape of the room.

customize Domoteck mats
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Question 17: Is it possible to extend or shorten a warming mat?

No, it is completely forbidden to extend or shorten a warming mat. It is very important to check precisely the size and the number of mats that are needed for the installation.
First of all, draw a precise sketch of the room, and then draw a layout of the warming mats/cables inside the room (leave a 30-50cm / 1”1 ½” gap between the system and the wall). Verify that all dimensions match the field dimensions. Prepare the installation plan including:

  1. Placement, direction and dimensions of the mat/cable
  2. The starting and the ending points of each mat/cable
  3. The location of the thermostat or other suitable control unit
  4. The location of the floor sensor
  5. The location of the connection point for the supply leads
warming mat

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Question 18: Is it possible to extend supply leads?

It is possible to extend supply leads (not heating cable!!!), according to the national electrical regulations and standards and according to the output of the heating cable. Connections must be made in a junction box.

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Question 19: What are the energy costs for a floor warming system?

Energy cost * 0.5 (50% current) * kW price

Example: For a 150W/m2 mat output
1m2 consumes 150W = 0.15kW
1hour of operation = approx. 1/2h of current
Consumption= 0.15kW * 0.5 = 0.075kWh/m2
Cost of operation = 0.075kWh/m2 * price of kW
[(Mat output (W/m2) * room area (m2))/1000] * kW price

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Question 20: What electrical setup does a typical installation of a floor warming system require?

The installation will require the following:

  • Dedicated 20 Amp circuit
  • RCD/GFCI protection
  • Junction boxes: The number of junction boxes will depend on the heating system and the number of controls being installed to regulate it. Each control will require 1 junction box. (Size may vary.) Multiple mat installations will require an additional junction box near floor level as well. Further details can be found on the recommended installation layout and in the Installation/ Homeowners Manual.
  • Contactor OR Multiple Controls: Multiple Controls installations will require the room to be split into more than one zone.
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Question 21: What should be measured and how?

You have to measure and record the resistance between phase wire and neutral, and insulation between grounding and phase/neutral of each element. Mark it down in your guarantee card. Assure all the following readings are taken:

  • Beginning & during mat/cable placement
  • Prior and after covering
  • Prior to wiring

Note: When measuring the resistance, pay attention to the surrounding temperature

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Question 22: How to place the floor sensor?

The sensor has to be placed under the flooring material, both for floor warming and floor heating.
For a floor warming system, place the floor sensor between two heating wires. It is also possible to place the sensor between two runs. Notice the sensor is placed between two open spaces. Do not place sensor between two cable loops.

Temperature Sensor

For floor heating, place the sensor just under the flooring material, on the self-aligned concrete layer (not deep in the floor at same level of the system).

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