The Thermonet matting is available in a kit which includes all the items (except insulation) that you will require for installation of your underfloor heating. These kits feature the 5245 Dual Thermostat which allows you to control your underfloor heating and an additional appliance such as a heated towel on individual schedules from the single thermostat.

Kit items include: Thermonet 150W/m² Mat, Programmable Thermostat (5245), Floor Temperature Sensor, Sensor Conduit, Cable Monitor (6025) & Installation Guide & Warranty Form.

You Won't See It, But You'll Feel It

Thermonet features 3.5mm TwistedTwin cable, self-adhesive mesh and our low-profile cold tail connection cable. These features make up what we call LayFlat Technology because this combination neutralises tension in the finished product and makes Thermonet easier to fit.

Safe, Simple And Reliable

Inside and out, Thermonet underfloor heating cables have a strong fluoropolymer coating, a continuous armoured earth sheath, and multi-shrand twin conductors.

The conductors are twisted together to remove electromagnetic fields (EMF) and to neutralize the cable’s stress, expansion, and contractions along its entire length, resulting in a more durable and long-lasting cable.

Technical Data

Heated width430mm
Max. thickness3.5mm
Max. temperature*28°C *
Protection RatingIP68
WarrantyLifetime on heating mat and 3 years on thermostat​
Conductor TypeSinge Ended
Cold Tail Length5m


* 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.

TwistedTwin Cable Construction

The stress-free cable structure results in a heating cable that lasts longer and has no electromagnetic field (Zero EMF).

Full Self Adhesive Mesh

Thermonet is installed wire-side-down which means the heating cable is protected from damage during installation by the hard wearing mesh layer.

Heating Cable Protection

Thermonet is put wire-side-down, which protects the heating cable from harm during installation.

Minimal Height Build-Up

Thermonet is easy to install thanks to revolutionary extrusion methods that give true "laid flat" technology. The matting system is only 3.5mm thick, with a 4mm thick low-profile cold tail that is usually hidden under the tile adhesive layer.

Stock No.SizeAreaOutputResis.ΩStock StatusAction
1115022 x 0.5m1m2150 W353 ΩIn Stock
1115033 x 0.5m1.5m2225 W235 ΩIn Stock
1115044 x 0.5m2m2300 W176 ΩIn Stock
1115055 x 0.5m2.5m2375 W141 ΩIn Stock
1115066 x 0.5m3m2450 W118 ΩIn Stock
1115077 x 0.5m3.5m2525 W101 ΩIn Stock
1115088 x 0.5m4m2600 W88 ΩIn Stock
1115099 x 0.5m4.5m2675 W78 ΩIn Stock
11151010 x 0.5m5m2750 W71 ΩIn Stock
11151212 x 0.5m6m2900 W59 ΩIn Stock
11151414 x 0.5m7m21050 W50 ΩIn Stock
11151616 x 0.5m8m21200 W44 ΩIn Stock
11151818 x 0.5m9m21350 W39 ΩIn Stock
11152020 x 0.5m10m21500 W35 ΩIn Stock
11152424 x 0.5m12m21800 W29 ΩIn Stock
11152828 x 0.5m14m22100 W25 ΩIn Stock
11153232 x 0.5m16m22400 W22 ΩIn Stock

Also available in kits including a Thermostat

Frequently Asked Questions

Thermonet 150W is intended for use above the screed, in the tile adhesive alone. It can be installed in screeds up to 20mm thick, but screeds thicker than 20mm require an In Screed Heating system like our Thermonet 200W.

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

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

The cable has an IP68 rating with a continuous earth braid along the length of it. This guarantees that the cable is safe if it comes into contact with water, as well as providing you with peace of mind in the unlikely event that the installation is damaged. We recommend that the heating system in the shower area not be turned off for further 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.

The self-adhesive matting system includes all of the heating wires pre-spaced, making installation faster and easier than with a loose wire system. Pre-spacing the heating cables also guarantees that the heating does not become spotty, as it does with slack wire.

If you’re wondering which floor heating system is best for you or are overwhelmed by the many options and offerings available, Thermogroup’s online underfloor heating system picker tool can assist you in making the best choice. Our underfloor heating picker walks you through a four-step process to choose the best underfloor heating system for your specific application, as well as a list of all the products you’ll need to complete the project, so you can be assured that you’ll have everything you need for installation. If you have any needs that aren’t covered by the tool, please contact us to talk about them.

The wattage per square metre and the purpose for which they are utilized 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 because 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 decide which system is best for your application.

The electrician will need to connect mains electricity to the thermostat site before roughing in for our underfloor heating and controller. The electrician will next 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 see our Conduit Requirements pdf for more information and a graphic representation.

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