Underfloor Heating

Many people assume that an electric underfloor heating system is going to be expensive to run. However, as your entire floor becomes your heating system, comfortable conditions are achieved at lower ambient temperatures. Even better, with its precise control and a tailored, zoned heating schedule, it is an efficient and very cost-effective way to heat your home.


A great choice for bathrooms, laundries and kitchens where moisture can build up causing mould. It’s equally beneficial in living and bedrooms.

timber & carpet system

This is suitable for most applications where the cable sits directly below the floor substrate, surrounded by a cement compound to correctly disperse the heat.

In screed system

In screed systems consist of both mats and cables and go below a screed layer of usually 30-75mm. You can use any floor coverings when using an in screed system, including concrete, granite, slate or stone.

In slab

In slab systems are a heating cable that is usually attached to the concrete mesh and heats up the whole slab similar to a hydronic system. These are suitable for heating polished concrete floors.

What are the benefits of underfloor heating

Frequently asked questions

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

When installed in the slab or screed layer, underfloor heating is suitable for most floor finishes, subject to manufacturers guidelines on maximum floor temperatures.

No – if installed correctly the floor heating does not affect the floor covering.

No, each zone that you want to have individual control over needs to have its own separate controller.

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.

hen 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.

Yes, with our Thermotouch 4.3dC dual control thermostat, you can individually control both your underfloor heating and towel rail from the single controller.

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.

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