Learn about Underfloor Heating
Heating System Selector
Enter your room type, substrate, and floor finish to select the underfloor heating type that best suits your application.
Use Tool
Quoting Tool
Our simple-to-use quoting tool will generate a quote for the supply of underfloor heating in a matter of minutes
Use Tool
Running Cost Calculator
Try our cost calculator to get a running cost estimate based on the size of your heating area and electricity tariff
Use Tool
article
5235W Launch Video
article
What is a screed?
project
Tara Maree Apartments
article
Warranty Information
article
Radiant Heating vs. Forced Air
article
Heating System Selector Tool
video
Thermonet Product
See the Underfloor Heating Range
Frequently Asked Questions
What is the best Underfloor Heating system for my application?
If you are unsure which floor heating system best suits your needs or daunted by the many options and offerings on the market, Thermogroup's online underfloor heating system selector tool can help you make the best decision. Our underfloor heating selector takes you through a simple four step process to determine the most suitable underfloor heating system for your individual application then also lists out all the products required to get the job done, so you can be assured that you will have everything required when it comes to installation. If you have any requirements outside of those specified on the tool do not hesitate to contact us to discuss your requirements.
Is electric heating safe in bathrooms? What about the water?
It is perfectly safe to install a Thermonet system in a bathroom. Thermonet is protected to IP68 standards which means it can be placed in zone 1 of a bathroom with no issues. The thermostat, however, should be installed away from water sources.
Do I need to use a special adhesive to fit tiles over underfloor heating?
You will need to use a cement based flexible tile adhesive, however there is a wide variety available so ask your manufacturer or tile retailer for guidance.
How do I control my underfloor heating system?
Every system should be connected to a Thermostat. You can have a simple, manual on/off version, but we recommend the use of a programmable heating thermostat with a heating schedule for better efficiency.
Do I need to include thermal insulation as part of my floor?
We recommend the use of Econoboard insulation as it can halve running costs. The underfloor heating systems will still be able to work without the use of insulation however it will increase the heat up times and running costs.
Do I need a contactor/snubber?
Thermogroup thermostats have a max load of 16amps. If your system exceeds this total load you will require a suitably rated contactor and snubber to ensure a safe and functional circuit.
Can I extend or shorten the cold tail?
Yes! The low profile cold tail can be shortened or extended up to 50m with a standard 1.5mm twin core flex. We recommend that connections are accessible.
Can I install Underfloor Heating in the shower?
Providing that the shower floor is tiled (not a shower base) like the rest of the bathroom floor, all of Thermogroup’s underfloor heating systems are suitable for installation in the shower area.
The cable has an IP (Ingress Protection) rating of IP68 and a continuous earth braid the full length of the cable. This ensures it is safe should the cable come in contact with water and gives you the assurance of safety in the unlikely event of install damage. For further protection we recommend that you do not end the heating system in the shower area.
What should I do if I have left-over heating cable?
You should always measure the room accurately and choose a system that covers the available heating area. If you do have extra cable you can run it around the edge of the room (Min. spacing 40 or 50mm), up the walls or in the shower (if tiled).
What happens if it goes wrong or breaks under my floor?
There are no moving parts to an electric underfloor heating system and cable failures are extremely rare, if installed correctly. A damaged cable can usually be located and repaired with minimal disruption.
Can I join two or more heating cables or mats to fit a larger area?
No, the heating cables or mats cannot be joined together however two or more can be connected in parallel to one Thermostat. When connecting multiple cables or mats you need to ensure that the total load does not exceed the total load of your thermostat.
Can I cut the heating cable if I have excess?
No - never. Cutting the heating cable will alter the resistance and cause the element to overheat. If you cut the cable by accident, please call our technical helpline for assistance.
How much does it cost to run an electric underfloor heating system?
Every system is different due to the insulation value of the property, type of flooring used and the level of insulation below the heating system. For estimated running costs check out our running costs calculator.
Can underfloor heating be used as the primary heat source?
Yes, if you cover at least 80% of the floor area with the underfloor heating system, this can be used as the primary heat source in the room.
What floor covering can I have on top of underfloor heating?
When installed in the slab or screed layer, underfloor heating is suitable for most floor finishes, subject to manufacturers guidelines on maximum floor temperatures.
How long should the floor heating be left on for?
The length of time depends on your lifestyle, the system used and the desired temperature.
Does floor heating cause any problems to the tiles or floor covering?
No - if installed correctly the floor heating does not affect the floor covering.
Who installs underfloor heating?
Our underfloor heating systems are designed to be simple to install and come with a comprehensive installation manual. Often the floor heating is installed by the electrician, tiler, builder or even the home owner. The testing and wiring up of the floor heating needs to be by a qualified electrician.
Can you walk on the installed heating cables before the tiles are laid?
Whilst the cable is durable and will handle foot traffic we recommend reducing walking on unfinished floor surfaces to a minimum as a precaution. Avoid putting heavy objects with sharp edges down on the cable such as buckets of tile glue.
Can I turn the heating on to make sure it heats up before the tiles are laid?
No. The heating cable systems need to be enclosed in a cement layer to help spread the heat. Turning on the heating before the cement layer is applied will cause the cable to overheat and burn out. The heating cable needs to be tested by a qualified electrician to ensure no damage has occurred during installation.
Does underfloor heating require any maintenance?
No. An electric underfloor heating system does not have any parts that require maintenance. The thermostat will need to be programmed according to your schedule and you can adjust this when you wish to.
What is the difference between single and double conductor heating cables and mats?
A single conductor mat or cable has only one cold tail which needs to be connected to the Thermostat as opposed to a double conductor cable or mat which has a cold tail at both ends of the heating cable that needs to be connected to the thermostat. All of the Thermogroup underfloor heating cables have a single cold tail, making installation quicker and easier.
Can I use my floor heating on ‘Off-Peak’ electricity?
When using In Slab heating, you can take advantage of the Off-Peak electricity tariff as heating the slab creates a thermal mass beneath your floor that allows for a slow continuous release of heat. Under tile and In Screed heating systems have a more rapid heat up and cool down time, therefore are not suitable to be used with Off-Peak electricity.
Are there any special wiring requirements?
Your electrician will need to ensure that the amperage of the circuit is suitable for the size of the floor heating system that is being installed. The floor heating must also be installed on a RCD protected circuit.
Does the floor sensor have to be installed in the conduit?
We recommend the use of a conduit for the floor sensor so that in the event of a floor sensor failing or the thermostat being upgraded, the floor sensor can be replaced without damaging the floor covering. If this is not possible we recommend installing a second-floor sensor as a spare.
What is the difference between an underfloor heating controller and a towel rail controller?
An underfloor heating controller (Thermostat) allows you to have control over the temperature of your floor whereas a towel rail controller is only a timing device (On/Off) and does not allow for any control over the temperature.
Can I control my underfloor heating using C-Bus?
Yes, ensure that you purchase the manual controller with your underfloor heating and this can be connected to and controlled by your C-Bus system.
Can I control my underfloor heating and towel rail from one controller?
Yes, with our Thermotouch 4.3dC dual control thermostat, you can individually control both your underfloor heating and towel rail from the single controller.
What is the flexible conduit for? Do I need to install it?
We recommend that the floor sensor is installed in the flexible conduit so that if the floor sensor fails or if you choose to upgrade your thermostat later the floor sensor can be removed and replaced without damaging the floor covering.
What is an Eco Temperature?
The Eco temperature is a lower temperature that is set for the ‘Off’ period on the Thermostat. This is normally set at a temperature between 15-18°C. This means that the heating will still come on if the temperature drops below this even during an ‘Off’ period ensuring, the floor heating will not be trying to heat from freezing for each ‘On’ period.
Will my Underfloor Heating Thermostat come with the Floor Sensor/probe?
Yes! All Underfloor Heating Thermostats supplied by Thermogroup come with a Floor Sensor and a 20mm flexible conduit to install the floor sensor in, making it easier to replace if necessary. You will find the Floor Sensor and Conduit in your Thermostat box, below the unit itself.
What is a floor sensor?
A floor sensor is a small probe that is installed beneath the floor, between two runs of heating cable. This is connected to the Thermostat and gives an accurate reading of the floor temperature.
What temperature should I set my underfloor heating at?
Every situation is different however it is recommended to set your underfloor heating to 24°C to begin with. After testing for several days increase or decrease the temperature to find your comfort temperature. Please note a decrease of 1°C may not affect the comfort or warmth of the floor enough to make it noticeable but can help to reduce running costs.
What is a contactor/snubber?
A contactor is designed to switch loads greater than 16A on one thermostat. The snubber must also be connected to absorb any electrical surges that could disrupt the memory of the thermostat.
Do I need a contactor/snubber?
Thermogroup thermostats have a max load of 16A. If your system exceeds this total load you will require a suitably rated contactor/snubber to ensure a safe and functional circuit.
Can I control multiple zones with one controller?
No, each zone that you want to have individual control over needs to have its own separate controller.
Should Underfloor Heating be installed below or above the waterproofing?
To ensure a fully waterproof substrate it is recommended to lay the floor heating over the waterproofing. In a screed application, where the waterproofing is on top of the screed, an in screed system can be laid before the waterproofing.
Is an Electric Underfloor Heating System possible with polished concrete floors?
When considering installing Underfloor Heating with a polished concrete floor, the answer is yes, this is possible! There are two options for how this can be done, using either our In-Slab or In-Screed System. Where a full slab is being poured and the surface polished, an In-Slab System can be used within this slab to heat the whole slab in a thermal mass. Alternatively, where a secondary slab is being poured and polished, then an In-Screed system can be used between the initial pour and the secondary slab, thus providing a more on-demand heating solution for your home. For further information, view our article on Polished Concrete & Underfloor Heating.
Can underfloor heating be laid directly over the waterproofing?
Underfloor heating cables can be laid directly on top of the waterproofing membrane once the waterproofing had cured. The heating cables will not affect the waterproofing membrane and can then be screeded or tiled directly over. When insulating in wetrooms we recommend using Coated Econoboard. Econoboard Uncoated is not suitable where waterproofing will be laid directly over the insulation.
- 1
- 2
- 3
- 4
- 5
Product Guide
Learn about Underfloor Heating
Heating System Selector
Enter your room type, substrate, and floor finish to select the underfloor heating type that best suits your application.
Use Tool
Quoting Tool
Our simple-to-use quoting tool will generate a quote for the supply of underfloor heating in a matter of minutes
Use Tool
Running Cost Calculator
Try our cost calculator to get a running cost estimate based on the size of your heating area and electricity tariff
Use Tool
article
5235W Launch Video
article
What is a screed?
project
Tara Maree Apartments
article
Warranty Information
article
Radiant Heating vs. Forced Air
article
KEEPING WARM IN THE OFFICE
article
Heating System Selector Tool
video
Thermonet Product
See the Underfloor Heating Range
Frequently Asked Questions
What is the best Underfloor Heating system for my application?
If you are unsure which floor heating system best suits your needs or daunted by the many options and offerings on the market, Thermogroup's online underfloor heating system selector tool can help you make the best decision. Our underfloor heating selector takes you through a simple four step process to determine the most suitable underfloor heating system for your individual application then also lists out all the products required to get the job done, so you can be assured that you will have everything required when it comes to installation. If you have any requirements outside of those specified on the tool do not hesitate to contact us to discuss your requirements.
Is electric heating safe in bathrooms? What about the water?
It is perfectly safe to install a Thermonet system in a bathroom. Thermonet is protected to IP68 standards which means it can be placed in zone 1 of a bathroom with no issues. The thermostat, however, should be installed away from water sources.
Do I need to use a special adhesive to fit tiles over underfloor heating?
You will need to use a cement based flexible tile adhesive, however there is a wide variety available so ask your manufacturer or tile retailer for guidance.
How do I control my underfloor heating system?
Every system should be connected to a Thermostat. You can have a simple, manual on/off version, but we recommend the use of a programmable heating thermostat with a heating schedule for better efficiency.
Do I need to include thermal insulation as part of my floor?
We recommend the use of Econoboard insulation as it can halve running costs. The underfloor heating systems will still be able to work without the use of insulation however it will increase the heat up times and running costs.
Do I need a contactor/snubber?
Thermogroup thermostats have a max load of 16amps. If your system exceeds this total load you will require a suitably rated contactor and snubber to ensure a safe and functional circuit.
Can I extend or shorten the cold tail?
Yes! The low profile cold tail can be shortened or extended up to 50m with a standard 1.5mm twin core flex. We recommend that connections are accessible.
Can I install Underfloor Heating in the shower?
Providing that the shower floor is tiled (not a shower base) like the rest of the bathroom floor, all of Thermogroup’s underfloor heating systems are suitable for installation in the shower area.
The cable has an IP (Ingress Protection) rating of IP68 and a continuous earth braid the full length of the cable. This ensures it is safe should the cable come in contact with water and gives you the assurance of safety in the unlikely event of install damage. For further protection we recommend that you do not end the heating system in the shower area.
What should I do if I have left-over heating cable?
You should always measure the room accurately and choose a system that covers the available heating area. If you do have extra cable you can run it around the edge of the room (Min. spacing 40 or 50mm), up the walls or in the shower (if tiled).
What happens if it goes wrong or breaks under my floor?
There are no moving parts to an electric underfloor heating system and cable failures are extremely rare, if installed correctly. A damaged cable can usually be located and repaired with minimal disruption.
Can I join two or more heating cables or mats to fit a larger area?
No, the heating cables or mats cannot be joined together however two or more can be connected in parallel to one Thermostat. When connecting multiple cables or mats you need to ensure that the total load does not exceed the total load of your thermostat.
Can I cut the heating cable if I have excess?
No - never. Cutting the heating cable will alter the resistance and cause the element to overheat. If you cut the cable by accident, please call our technical helpline for assistance.
What are the rough in or first fix requirements for Underfloor Heating and a Controller?
When roughing in for our Underfloor Heating and the controller, the electrician will first need to bring mains power to the Thermostat location. The electrician will then also need to run two 20mm conduits from the Thermostat position down to the floor, for the Underfloor Heating Cold Tail and for the Floor Sensor. For further information and a visual representation, please view our Conduit Requirements download.
How much does it cost to run an electric underfloor heating system?
Every system is different due to the insulation value of the property, type of flooring used and the level of insulation below the heating system. For estimated running costs check out our running costs calculator.
Can underfloor heating be used as the primary heat source?
Yes, if you cover at least 80% of the floor area with the underfloor heating system, this can be used as the primary heat source in the room.
What floor covering can I have on top of underfloor heating?
When installed in the slab or screed layer, underfloor heating is suitable for most floor finishes, subject to manufacturers guidelines on maximum floor temperatures.
How long should the floor heating be left on for?
The length of time depends on your lifestyle, the system used and the desired temperature.
Does floor heating cause any problems to the tiles or floor covering?
No - if installed correctly the floor heating does not affect the floor covering.
Who installs underfloor heating?
Our underfloor heating systems are designed to be simple to install and come with a comprehensive installation manual. Often the floor heating is installed by the electrician, tiler, builder or even the home owner. The testing and wiring up of the floor heating needs to be by a qualified electrician.
Can you walk on the installed heating cables before the tiles are laid?
Whilst the cable is durable and will handle foot traffic we recommend reducing walking on unfinished floor surfaces to a minimum as a precaution. Avoid putting heavy objects with sharp edges down on the cable such as buckets of tile glue.
Can I turn the heating on to make sure it heats up before the tiles are laid?
No. The heating cable systems need to be enclosed in a cement layer to help spread the heat. Turning on the heating before the cement layer is applied will cause the cable to overheat and burn out. The heating cable needs to be tested by a qualified electrician to ensure no damage has occurred during installation.
Does underfloor heating require any maintenance?
No. An electric underfloor heating system does not have any parts that require maintenance. The thermostat will need to be programmed according to your schedule and you can adjust this when you wish to.
What is the difference between single and double conductor heating cables and mats?
A single conductor mat or cable has only one cold tail which needs to be connected to the Thermostat as opposed to a double conductor cable or mat which has a cold tail at both ends of the heating cable that needs to be connected to the thermostat. All of the Thermogroup underfloor heating cables have a single cold tail, making installation quicker and easier.
Can I use my floor heating on ‘Off-Peak’ electricity?
When using In Slab heating, you can take advantage of the Off-Peak electricity tariff as heating the slab creates a thermal mass beneath your floor that allows for a slow continuous release of heat. Under tile and In Screed heating systems have a more rapid heat up and cool down time, therefore are not suitable to be used with Off-Peak electricity.
Are there any special wiring requirements?
Your electrician will need to ensure that the amperage of the circuit is suitable for the size of the floor heating system that is being installed. The floor heating must also be installed on a RCD protected circuit.
Does the floor sensor have to be installed in the conduit?
We recommend the use of a conduit for the floor sensor so that in the event of a floor sensor failing or the thermostat being upgraded, the floor sensor can be replaced without damaging the floor covering. If this is not possible we recommend installing a second-floor sensor as a spare.
What is the difference between an underfloor heating controller and a towel rail controller?
An underfloor heating controller (Thermostat) allows you to have control over the temperature of your floor whereas a towel rail controller is only a timing device (On/Off) and does not allow for any control over the temperature.
Can I control my underfloor heating using C-Bus?
Yes, ensure that you purchase the manual controller with your underfloor heating and this can be connected to and controlled by your C-Bus system.
Can I control my underfloor heating and towel rail from one controller?
Yes, with our Thermotouch 4.3dC dual control thermostat, you can individually control both your underfloor heating and towel rail from the single controller.
What is the flexible conduit for? Do I need to install it?
We recommend that the floor sensor is installed in the flexible conduit so that if the floor sensor fails or if you choose to upgrade your thermostat later the floor sensor can be removed and replaced without damaging the floor covering.
What is an Eco Temperature?
The Eco temperature is a lower temperature that is set for the ‘Off’ period on the Thermostat. This is normally set at a temperature between 15-18°C. This means that the heating will still come on if the temperature drops below this even during an ‘Off’ period ensuring, the floor heating will not be trying to heat from freezing for each ‘On’ period.
Will my Underfloor Heating Thermostat come with the Floor Sensor/probe?
Yes! All Underfloor Heating Thermostats supplied by Thermogroup come with a Floor Sensor and a 20mm flexible conduit to install the floor sensor in, making it easier to replace if necessary. You will find the Floor Sensor and Conduit in your Thermostat box, below the unit itself.
What is a floor sensor?
A floor sensor is a small probe that is installed beneath the floor, between two runs of heating cable. This is connected to the Thermostat and gives an accurate reading of the floor temperature.
What temperature should I set my underfloor heating at?
Every situation is different however it is recommended to set your underfloor heating to 24°C to begin with. After testing for several days increase or decrease the temperature to find your comfort temperature. Please note a decrease of 1°C may not affect the comfort or warmth of the floor enough to make it noticeable but can help to reduce running costs.
What is a contactor/snubber?
A contactor is designed to switch loads greater than 16A on one thermostat. The snubber must also be connected to absorb any electrical surges that could disrupt the memory of the thermostat.
Do I need a contactor/snubber?
Thermogroup thermostats have a max load of 16A. If your system exceeds this total load you will require a suitably rated contactor/snubber to ensure a safe and functional circuit.
Can I control multiple zones with one controller?
No, each zone that you want to have individual control over needs to have its own separate controller.
Should Underfloor Heating be installed below or above the waterproofing?
To ensure a fully waterproof substrate it is recommended to lay the floor heating over the waterproofing. In a screed application, where the waterproofing is on top of the screed, an in screed system can be laid before the waterproofing.
Is an Electric Underfloor Heating System possible with polished concrete floors?
When considering installing Underfloor Heating with a polished concrete floor, the answer is yes, this is possible! There are two options for how this can be done, using either our In-Slab or In-Screed System. Where a full slab is being poured and the surface polished, an In-Slab System can be used within this slab to heat the whole slab in a thermal mass. Alternatively, where a secondary slab is being poured and polished, then an In-Screed system can be used between the initial pour and the secondary slab, thus providing a more on-demand heating solution for your home. For further information, view our article on Polished Concrete & Underfloor Heating.
Can underfloor heating be laid directly over the waterproofing?
Underfloor heating cables can be laid directly on top of the waterproofing membrane once the waterproofing had cured. The heating cables will not affect the waterproofing membrane and can then be screeded or tiled directly over. When insulating in wetrooms we recommend using Coated Econoboard. Econoboard Uncoated is not suitable where waterproofing will be laid directly over the insulation.
- 1
- 2
- 3
- 4
- 5
Product Guide
Learn about Underfloor Heating
Heating System Selector
Enter your room type, substrate, and floor finish to select the underfloor heating type that best suits your application.
Use Tool
Quoting Tool
Our simple-to-use quoting tool will generate a quote for the supply of underfloor heating in a matter of minutes
Use Tool
Running Cost Calculator
Try our cost calculator to get a running cost estimate based on the size of your heating area and electricity tariff
Use Tool
article
5235W Launch Video
article
What is a screed?
article
Thermochamp Installer Program
project
Tara Maree Apartments
article
Warranty Information
article
Radiant Heating vs. Forced Air
article
Heating System Selector Tool
video
Thermonet Product
See the Underfloor Heating Range
Frequently Asked Questions
What is the best Underfloor Heating system for my application?
If you are unsure which floor heating system best suits your needs or daunted by the many options and offerings on the market, Thermogroup's online underfloor heating system selector tool can help you make the best decision. Our underfloor heating selector takes you through a simple four step process to determine the most suitable underfloor heating system for your individual application then also lists out all the products required to get the job done, so you can be assured that you will have everything required when it comes to installation. If you have any requirements outside of those specified on the tool do not hesitate to contact us to discuss your requirements.
Is electric heating safe in bathrooms? What about the water?
It is perfectly safe to install a Thermonet system in a bathroom. Thermonet is protected to IP68 standards which means it can be placed in zone 1 of a bathroom with no issues. The thermostat, however, should be installed away from water sources.
Do I need to use a special adhesive to fit tiles over underfloor heating?
You will need to use a cement based flexible tile adhesive, however there is a wide variety available so ask your manufacturer or tile retailer for guidance.
How do I control my underfloor heating system?
Every system should be connected to a Thermostat. You can have a simple, manual on/off version, but we recommend the use of a programmable heating thermostat with a heating schedule for better efficiency.
Do I need to include thermal insulation as part of my floor?
We recommend the use of Econoboard insulation as it can halve running costs. The underfloor heating systems will still be able to work without the use of insulation however it will increase the heat up times and running costs.
Do I need a contactor/snubber?
Thermogroup thermostats have a max load of 16amps. If your system exceeds this total load you will require a suitably rated contactor and snubber to ensure a safe and functional circuit.
Can I extend or shorten the cold tail?
Yes! The low profile cold tail can be shortened or extended up to 50m with a standard 1.5mm twin core flex. We recommend that connections are accessible.
Can I install Underfloor Heating in the shower?
Providing that the shower floor is tiled (not a shower base) like the rest of the bathroom floor, all of Thermogroup’s underfloor heating systems are suitable for installation in the shower area.
The cable has an IP (Ingress Protection) rating of IP68 and a continuous earth braid the full length of the cable. This ensures it is safe should the cable come in contact with water and gives you the assurance of safety in the unlikely event of install damage. For further protection we recommend that you do not end the heating system in the shower area.
What should I do if I have left-over heating cable?
You should always measure the room accurately and choose a system that covers the available heating area. If you do have extra cable you can run it around the edge of the room (Min. spacing 40 or 50mm), up the walls or in the shower (if tiled).
What happens if it goes wrong or breaks under my floor?
There are no moving parts to an electric underfloor heating system and cable failures are extremely rare, if installed correctly. A damaged cable can usually be located and repaired with minimal disruption.
Can I join two or more heating cables or mats to fit a larger area?
No, the heating cables or mats cannot be joined together however two or more can be connected in parallel to one Thermostat. When connecting multiple cables or mats you need to ensure that the total load does not exceed the total load of your thermostat.
Can I cut the heating cable if I have excess?
No - never. Cutting the heating cable will alter the resistance and cause the element to overheat. If you cut the cable by accident, please call our technical helpline for assistance.
What are the rough in or first fix requirements for Underfloor Heating and a Controller?
When roughing in for our Underfloor Heating and the controller, the electrician will first need to bring mains power to the Thermostat location. The electrician will then also need to run two 20mm conduits from the Thermostat position down to the floor, for the Underfloor Heating Cold Tail and for the Floor Sensor. For further information and a visual representation, please view our Conduit Requirements download.
How much does it cost to run an electric underfloor heating system?
Every system is different due to the insulation value of the property, type of flooring used and the level of insulation below the heating system. For estimated running costs check out our running costs calculator.
Can underfloor heating be used as the primary heat source?
Yes, if you cover at least 80% of the floor area with the underfloor heating system, this can be used as the primary heat source in the room.
What floor covering can I have on top of underfloor heating?
When installed in the slab or screed layer, underfloor heating is suitable for most floor finishes, subject to manufacturers guidelines on maximum floor temperatures.
How long should the floor heating be left on for?
The length of time depends on your lifestyle, the system used and the desired temperature.
Does floor heating cause any problems to the tiles or floor covering?
No - if installed correctly the floor heating does not affect the floor covering.
Who installs underfloor heating?
Our underfloor heating systems are designed to be simple to install and come with a comprehensive installation manual. Often the floor heating is installed by the electrician, tiler, builder or even the home owner. The testing and wiring up of the floor heating needs to be by a qualified electrician.
Can you walk on the installed heating cables before the tiles are laid?
Whilst the cable is durable and will handle foot traffic we recommend reducing walking on unfinished floor surfaces to a minimum as a precaution. Avoid putting heavy objects with sharp edges down on the cable such as buckets of tile glue.
Can I turn the heating on to make sure it heats up before the tiles are laid?
No. The heating cable systems need to be enclosed in a cement layer to help spread the heat. Turning on the heating before the cement layer is applied will cause the cable to overheat and burn out. The heating cable needs to be tested by a qualified electrician to ensure no damage has occurred during installation.
Does underfloor heating require any maintenance?
No. An electric underfloor heating system does not have any parts that require maintenance. The thermostat will need to be programmed according to your schedule and you can adjust this when you wish to.
What is the difference between single and double conductor heating cables and mats?
A single conductor mat or cable has only one cold tail which needs to be connected to the Thermostat as opposed to a double conductor cable or mat which has a cold tail at both ends of the heating cable that needs to be connected to the thermostat. All of the Thermogroup underfloor heating cables have a single cold tail, making installation quicker and easier.
Can I use my floor heating on ‘Off-Peak’ electricity?
When using In Slab heating, you can take advantage of the Off-Peak electricity tariff as heating the slab creates a thermal mass beneath your floor that allows for a slow continuous release of heat. Under tile and In Screed heating systems have a more rapid heat up and cool down time, therefore are not suitable to be used with Off-Peak electricity.
Are there any special wiring requirements?
Your electrician will need to ensure that the amperage of the circuit is suitable for the size of the floor heating system that is being installed. The floor heating must also be installed on a RCD protected circuit.
Does the floor sensor have to be installed in the conduit?
We recommend the use of a conduit for the floor sensor so that in the event of a floor sensor failing or the thermostat being upgraded, the floor sensor can be replaced without damaging the floor covering. If this is not possible we recommend installing a second-floor sensor as a spare.
What is the difference between an underfloor heating controller and a towel rail controller?
An underfloor heating controller (Thermostat) allows you to have control over the temperature of your floor whereas a towel rail controller is only a timing device (On/Off) and does not allow for any control over the temperature.
Can I control my underfloor heating using C-Bus?
Yes, ensure that you purchase the manual controller with your underfloor heating and this can be connected to and controlled by your C-Bus system.
Can I control my underfloor heating and towel rail from one controller?
Yes, with our Thermotouch 4.3dC dual control thermostat, you can individually control both your underfloor heating and towel rail from the single controller.
What is the flexible conduit for? Do I need to install it?
We recommend that the floor sensor is installed in the flexible conduit so that if the floor sensor fails or if you choose to upgrade your thermostat later the floor sensor can be removed and replaced without damaging the floor covering.
What is an Eco Temperature?
The Eco temperature is a lower temperature that is set for the ‘Off’ period on the Thermostat. This is normally set at a temperature between 15-18°C. This means that the heating will still come on if the temperature drops below this even during an ‘Off’ period ensuring, the floor heating will not be trying to heat from freezing for each ‘On’ period.
Will my Underfloor Heating Thermostat come with the Floor Sensor/probe?
Yes! All Underfloor Heating Thermostats supplied by Thermogroup come with a Floor Sensor and a 20mm flexible conduit to install the floor sensor in, making it easier to replace if necessary. You will find the Floor Sensor and Conduit in your Thermostat box, below the unit itself.
What is a floor sensor?
A floor sensor is a small probe that is installed beneath the floor, between two runs of heating cable. This is connected to the Thermostat and gives an accurate reading of the floor temperature.
What temperature should I set my underfloor heating at?
Every situation is different however it is recommended to set your underfloor heating to 24°C to begin with. After testing for several days increase or decrease the temperature to find your comfort temperature. Please note a decrease of 1°C may not affect the comfort or warmth of the floor enough to make it noticeable but can help to reduce running costs.
What is a contactor/snubber?
A contactor is designed to switch loads greater than 16A on one thermostat. The snubber must also be connected to absorb any electrical surges that could disrupt the memory of the thermostat.
Do I need a contactor/snubber?
Thermogroup thermostats have a max load of 16A. If your system exceeds this total load you will require a suitably rated contactor/snubber to ensure a safe and functional circuit.
Can I control multiple zones with one controller?
No, each zone that you want to have individual control over needs to have its own separate controller.
Should Underfloor Heating be installed below or above the waterproofing?
To ensure a fully waterproof substrate it is recommended to lay the floor heating over the waterproofing. In a screed application, where the waterproofing is on top of the screed, an in screed system can be laid before the waterproofing.
Is an Electric Underfloor Heating System possible with polished concrete floors?
When considering installing Underfloor Heating with a polished concrete floor, the answer is yes, this is possible! There are two options for how this can be done, using either our In-Slab or In-Screed System. Where a full slab is being poured and the surface polished, an In-Slab System can be used within this slab to heat the whole slab in a thermal mass. Alternatively, where a secondary slab is being poured and polished, then an In-Screed system can be used between the initial pour and the secondary slab, thus providing a more on-demand heating solution for your home. For further information, view our article on Polished Concrete & Underfloor Heating.
Can underfloor heating be laid directly over the waterproofing?
Underfloor heating cables can be laid directly on top of the waterproofing membrane once the waterproofing had cured. The heating cables will not affect the waterproofing membrane and can then be screeded or tiled directly over. When insulating in wetrooms we recommend using Coated Econoboard. Econoboard Uncoated is not suitable where waterproofing will be laid directly over the insulation.
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Product Guide
Learn about Underfloor Heating
Heating System Selector
Enter your room type, substrate, and floor finish to select the underfloor heating type that best suits your application.
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Quoting Tool
Our simple-to-use quoting tool will generate a quote for the supply of underfloor heating in a matter of minutes
Use Tool
Running Cost Calculator
Try our cost calculator to get a running cost estimate based on the size of your heating area and electricity tariff
Use Tool
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Thermonet Product
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Frequently Asked Questions
What is the best Underfloor Heating system for my application?
If you are unsure which floor heating system best suits your needs or daunted by the many options and offerings on the market, Thermogroup's online underfloor heating system selector tool can help you make the best decision. Our underfloor heating selector takes you through a simple four step process to determine the most suitable underfloor heating system for your individual application then also lists out all the products required to get the job done, so you can be assured that you will have everything required when it comes to installation. If you have any requirements outside of those specified on the tool do not hesitate to contact us to discuss your requirements.
Is electric heating safe in bathrooms? What about the water?
It is perfectly safe to install a Thermonet system in a bathroom. Thermonet is protected to IP68 standards which means it can be placed in zone 1 of a bathroom with no issues. The thermostat, however, should be installed away from water sources.
Do I need to use a special adhesive to fit tiles over underfloor heating?
You will need to use a cement based flexible tile adhesive, however there is a wide variety available so ask your manufacturer or tile retailer for guidance.
How do I control my underfloor heating system?
Every system should be connected to a Thermostat. You can have a simple, manual on/off version, but we recommend the use of a programmable heating thermostat with a heating schedule for better efficiency.
Do I need to include thermal insulation as part of my floor?
We recommend the use of Econoboard insulation as it can halve running costs. The underfloor heating systems will still be able to work without the use of insulation however it will increase the heat up times and running costs.
Do I need a contactor/snubber?
Thermogroup thermostats have a max load of 16amps. If your system exceeds this total load you will require a suitably rated contactor and snubber to ensure a safe and functional circuit.
Can I extend or shorten the cold tail?
Yes! The low profile cold tail can be shortened or extended up to 50m with a standard 1.5mm twin core flex. We recommend that connections are accessible.
Can I install Underfloor Heating in the shower?
Providing that the shower floor is tiled (not a shower base) like the rest of the bathroom floor, all of Thermogroup’s underfloor heating systems are suitable for installation in the shower area.
The cable has an IP (Ingress Protection) rating of IP68 and a continuous earth braid the full length of the cable. This ensures it is safe should the cable come in contact with water and gives you the assurance of safety in the unlikely event of install damage. For further protection we recommend that you do not end the heating system in the shower area.
What should I do if I have left-over heating cable?
You should always measure the room accurately and choose a system that covers the available heating area. If you do have extra cable you can run it around the edge of the room (Min. spacing 40 or 50mm), up the walls or in the shower (if tiled).
What happens if it goes wrong or breaks under my floor?
There are no moving parts to an electric underfloor heating system and cable failures are extremely rare, if installed correctly. A damaged cable can usually be located and repaired with minimal disruption.
Can I join two or more heating cables or mats to fit a larger area?
No, the heating cables or mats cannot be joined together however two or more can be connected in parallel to one Thermostat. When connecting multiple cables or mats you need to ensure that the total load does not exceed the total load of your thermostat.
Can I cut the heating cable if I have excess?
No - never. Cutting the heating cable will alter the resistance and cause the element to overheat. If you cut the cable by accident, please call our technical helpline for assistance.
How much does it cost to run an electric underfloor heating system?
Every system is different due to the insulation value of the property, type of flooring used and the level of insulation below the heating system. For estimated running costs check out our running costs calculator.
Can underfloor heating be used as the primary heat source?
Yes, if you cover at least 80% of the floor area with the underfloor heating system, this can be used as the primary heat source in the room.
What floor covering can I have on top of underfloor heating?
When installed in the slab or screed layer, underfloor heating is suitable for most floor finishes, subject to manufacturers guidelines on maximum floor temperatures.
How long should the floor heating be left on for?
The length of time depends on your lifestyle, the system used and the desired temperature.
Does floor heating cause any problems to the tiles or floor covering?
No - if installed correctly the floor heating does not affect the floor covering.
Who installs underfloor heating?
Our underfloor heating systems are designed to be simple to install and come with a comprehensive installation manual. Often the floor heating is installed by the electrician, tiler, builder or even the home owner. The testing and wiring up of the floor heating needs to be by a qualified electrician.
Can you walk on the installed heating cables before the tiles are laid?
Whilst the cable is durable and will handle foot traffic we recommend reducing walking on unfinished floor surfaces to a minimum as a precaution. Avoid putting heavy objects with sharp edges down on the cable such as buckets of tile glue.
Can I turn the heating on to make sure it heats up before the tiles are laid?
No. The heating cable systems need to be enclosed in a cement layer to help spread the heat. Turning on the heating before the cement layer is applied will cause the cable to overheat and burn out. The heating cable needs to be tested by a qualified electrician to ensure no damage has occurred during installation.
Does underfloor heating require any maintenance?
No. An electric underfloor heating system does not have any parts that require maintenance. The thermostat will need to be programmed according to your schedule and you can adjust this when you wish to.
What is the difference between single and double conductor heating cables and mats?
A single conductor mat or cable has only one cold tail which needs to be connected to the Thermostat as opposed to a double conductor cable or mat which has a cold tail at both ends of the heating cable that needs to be connected to the thermostat. All of the Thermogroup underfloor heating cables have a single cold tail, making installation quicker and easier.
Can I use my floor heating on ‘Off-Peak’ electricity?
When using In Slab heating, you can take advantage of the Off-Peak electricity tariff as heating the slab creates a thermal mass beneath your floor that allows for a slow continuous release of heat. Under tile and In Screed heating systems have a more rapid heat up and cool down time, therefore are not suitable to be used with Off-Peak electricity.
Are there any special wiring requirements?
Your electrician will need to ensure that the amperage of the circuit is suitable for the size of the floor heating system that is being installed. The floor heating must also be installed on a RCD protected circuit.
Does the floor sensor have to be installed in the conduit?
We recommend the use of a conduit for the floor sensor so that in the event of a floor sensor failing or the thermostat being upgraded, the floor sensor can be replaced without damaging the floor covering. If this is not possible we recommend installing a second-floor sensor as a spare.
What is the difference between an underfloor heating controller and a towel rail controller?
An underfloor heating controller (Thermostat) allows you to have control over the temperature of your floor whereas a towel rail controller is only a timing device (On/Off) and does not allow for any control over the temperature.
Can I control my underfloor heating using C-Bus?
Yes, ensure that you purchase the manual controller with your underfloor heating and this can be connected to and controlled by your C-Bus system.
Can I control my underfloor heating and towel rail from one controller?
Yes, with our Thermotouch 4.3dC dual control thermostat, you can individually control both your underfloor heating and towel rail from the single controller.
What is the flexible conduit for? Do I need to install it?
We recommend that the floor sensor is installed in the flexible conduit so that if the floor sensor fails or if you choose to upgrade your thermostat later the floor sensor can be removed and replaced without damaging the floor covering.
What is an Eco Temperature?
The Eco temperature is a lower temperature that is set for the ‘Off’ period on the Thermostat. This is normally set at a temperature between 15-18°C. This means that the heating will still come on if the temperature drops below this even during an ‘Off’ period ensuring, the floor heating will not be trying to heat from freezing for each ‘On’ period.
Will my Underfloor Heating Thermostat come with the Floor Sensor/probe?
Yes! All Underfloor Heating Thermostats supplied by Thermogroup come with a Floor Sensor and a 20mm flexible conduit to install the floor sensor in, making it easier to replace if necessary. You will find the Floor Sensor and Conduit in your Thermostat box, below the unit itself.
What is a floor sensor?
A floor sensor is a small probe that is installed beneath the floor, between two runs of heating cable. This is connected to the Thermostat and gives an accurate reading of the floor temperature.
What temperature should I set my underfloor heating at?
Every situation is different however it is recommended to set your underfloor heating to 24°C to begin with. After testing for several days increase or decrease the temperature to find your comfort temperature. Please note a decrease of 1°C may not affect the comfort or warmth of the floor enough to make it noticeable but can help to reduce running costs.
What is a contactor/snubber?
A contactor is designed to switch loads greater than 16A on one thermostat. The snubber must also be connected to absorb any electrical surges that could disrupt the memory of the thermostat.
Do I need a contactor/snubber?
Thermogroup thermostats have a max load of 16A. If your system exceeds this total load you will require a suitably rated contactor/snubber to ensure a safe and functional circuit.
Can I control multiple zones with one controller?
No, each zone that you want to have individual control over needs to have its own separate controller.
Should Underfloor Heating be installed below or above the waterproofing?
To ensure a fully waterproof substrate it is recommended to lay the floor heating over the waterproofing. In a screed application, where the waterproofing is on top of the screed, an in screed system can be laid before the waterproofing.
Is an Electric Underfloor Heating System possible with polished concrete floors?
When considering installing Underfloor Heating with a polished concrete floor, the answer is yes, this is possible! There are two options for how this can be done, using either our In-Slab or In-Screed System. Where a full slab is being poured and the surface polished, an In-Slab System can be used within this slab to heat the whole slab in a thermal mass. Alternatively, where a secondary slab is being poured and polished, then an In-Screed system can be used between the initial pour and the secondary slab, thus providing a more on-demand heating solution for your home. For further information, view our article on Polished Concrete & Underfloor Heating.
Can underfloor heating be laid directly over the waterproofing?
heating cables will not affect the waterproofing membrane and can then be screeded or tiled directly over. When insulating in wetrooms we recommend using Coated Econoboard. Econoboard Uncoated is not suitable where waterproofing will be laid directly over the insulation.
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