?Calibre Connect

24/7 Mon to Sun
We're Open
5-Star Service ★★★★★

Thermoscreed Loose Wire Heating Cable

Thermoscreed is ideal for new build projects where height build up is not limited. Designed for use in 20 – 100mm screed layers. In Screed heating systems allow the floor layer to prepare a perfectly flat floor to lay the floor covering over. Thermoscreed is suitable for almost any flooring finish including wood, carpet and vinyl.

Thermoscreed is a versatile heating cable designed for installation in the screed layer of new builds or renovation projects. It creates an energy efficient heating system by warming the screed to create a slow release thermal mass. Suitable for use with sand and cement, anhydrite and flow screeds.


Technical Data

Cable Thickness 5.5mm
Max. Temperature 28°C *
Max. temperature* 28°C *
Protection Rating IP67
Warranty Lifetime
Wattage 18W/lm
Conductor Type Singe Ended
Cold Tail Length 3m

* Regulated by floor sensing thermostat



Lifetime Warranty

We are so confident in the quality of Thermonet Underfloor Heating cable that we provide a lifetime warranty on each system, as well as a three-year warranty on our thermostats.


Robust, hard wearing cable

We are so convinced in the quality of Thermonet Underfloor Heating cable that each system comes with a lifetime warranty, as well as a three-year warranty on the thermostats.


In Screed heating

It is recommended to be fixed to insulation boards and is suitable for installation in screeds ranging from 20mm to 100mm.


Efficient storage heating effect

Screed systems take longer to heat up and cool down, making them ideal for high-use areas.

Flexible cable spacing

By adjusting the cable spacing, you may get the heating output per m2 that your architect specified for the room. Under screed, we recommend an output of 180-220m2.

Stock No. Length Area Output Resis.Ω Stock Status Action
3050 11m 1.0 - 1.2m2 200 W 264.5 Ω In Stock
3051 16.5m 1.3 - 1.7m2 300 W 176.3 Ω In Stock
3052 22m 1.8 - 2.2m2 400 W 132.2 Ω In Stock
3053 27.5m 2.3 - 2.7m2 500 W 105.8 Ω In Stock
3054 33m 2.8 - 3.2m2 600 W 88.2 Ω In Stock
3055 39m 3.3 - 3.8m2 700 W 75.6 Ω In Stock
3056 45m 3.9 - 4.6m2 850 W 62.2 Ω In Stock
3057 55m 4.7 - 5.6m2 1000 W 52.9 Ω In Stock
3058 69m 5.7 - 6.8m2 1250 W 42.3 Ω In Stock
3059 76m 6.9 - 7.6m2 1375 W 38.5 Ω In Stock
3060 94m 7.7 - 9.4m2 1700 W 31.1 Ω In Stock
3061 116m 9.6 - 11.7m2 2100 W 25.2 Ω In Stock
3062 144m 11.8 - 14.4m2 2600 W 20.4 Ω In Stock
3063 183m 14.5 - 18.3m2 3300 W 16 Ω In Stock

Also available in kits including a Thermostat

Installation Accessories

Stock No. Description Size Stock Status Action
3261 In Screed Cable Mesh 5m roll 1.2 x 5m Low Stock
3259 Galvanised Fixing Profile 25m roll 25m In Stock
5418 Fixing Tape - 50Lm 50mm x 50m In Stock

Frequently Asked Questions

Screed Heating is intended to be implemented in screed layers ranging from 20 to 100mm thick.

Floor heating will take 2-4 hours to reach temperature in a normal Undertile build-up, and in Screed heating cable under a 25mm screed will likewise require 2-4 hours. However, for every additional 25mm of screed, the heat must be allowed to penetrate for an additional hour.

All of Thermogroup's underfloor heating systems are appropriate for installation in the shower area if the shower floor is tiled (not a shower base) like the rest of the bathroom floor.

The cable features an IP68 rating for ingress protection and a continuous earth braid that runs the length of the cable. This guarantees that the cable is safe if it comes into contact with water and gives you peace of mind in the unlikely event that the installation is damaged. We recommend that you do not turn off the heating system in the shower area for added safety.

Underfloor heating cable must be coated with a cement-based substance and cannot be used in voids. As long as the shower seat is tiled to match the rest of the bathroom and all cables are covered with a cement-based flexible tile glue, installing heating on a shower seat is entirely safe.

If you're wondering which floor heating system is best for you or are overwhelmed by the numerous options and possibilities available, Thermogroup's online underfloor heating system selector tool can assist you in making the best choice. Our underfloor heating selector walks you through a simple four-step process to determine the best underfloor heating system for your specific application, as well as a list of all the products you'll need to complete the job, so you can rest assured that you'll have everything you need for installation. If you have any requirements that aren't covered by the tool, please don't hesitate to contact us to discuss them.

Yes, absolutely. Although the Thermonet 200W system is designed to be installed beneath a screed, it can also be installed directly beneath the tiles, just as the 150W system can. When positioned directly beneath the tiles, the 200W system will heat up faster than the 150W system due to the larger wattage. Use the 200W system directly beneath the tiles if you want a more on-demand system or if you have a significant heat loss application.

The wattage per square metre and application are the only differences between Thermonet 150W and Thermonet 200W. The Thermonet 150W is designed to be set directly beneath tile, in the tile adhesive, whereas the Thermonet 200W is designed to be installed beneath a screed since the increased wattage makes it more successful at heating through this screed. Please see our article on which system is more effective for a more detailed comparison, or use our Heating System Selector to figure out which system is best for your needs.

It is advised that the floor heating be installed over the waterproofing to ensure a completely waterproof substrate. An in screed system can be installed before the waterproofing in a screed application where the waterproofing is on top of the screed.

The electrician will need to connect mains electricity to the Thermostat position before roughing in for our Underfloor Heating and the controller. The electrician will then need to run two 20mm conduits from the thermostat position to the floor, one for the Underfloor Heating Cold Tail and the other for the Floor Sensor. Please download our Conduit Requirements document for more information and a graphic representation.