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ThermoSphere Underfloor Heating: Leading The Charge For Electric Heating

ThermoSphere Underfloor Heating

ThermoSphere underfloor heating has emerged as a favourite amongst tradespeople and DIYers in the field of electric underfloor heating, offering cutting-edge technology designed to enhance comfort while minimising environmental impact. In this blog post, we delve into why ThermoSphere’s latest award-winning heating cable, ThermoSphere Ultimate®, is a worthwhile investment for your underfloor heating project.

What is ThermoSphere Ultimate?

ThermoSphere Ultimate® is the first electric underfloor heating cable to combine both TwistedTwin cable construction and in-line joint technology. This combination makes it stronger and more durable than standard electric underfloor heating cables. It also removes the bulky hot-to-cold joints seen in others, which is one of the primary points of failure resulting from cable installation. This is because most electric underfloor heating cables have a 12mm joint where the heating cable meets the cold cable. ThermoSphere Ultimate has in-line joints, which results in a cable that has a uniform 4mm thickness and only requires a simple thumb-press into the membrane mat.

Ultimately, unlike traditional underfloor heating cables, there’s no hot-to-cold joint that needs cutting into the membrane mat or the subfloor. So, there’s no risk of damaging the cable at this part of the installation process and no time wasted because of needing to cut in a bulky cold tail joint.

Why ThermoSphere Underfloor Heating?

Underfloor heating with bathtub in the background

ThermoSphere's underfloor heating systems are renowned for their superior performance, reliability, and ease of installation. Utilising advanced electric heating technology, ThermoSphere underfloor heating cable systems distribute warmth evenly across the floor surface, creating a comfortable living environment without the need for bulky radiators or ductwork.

One of the key advantages of ThermoSphere underfloor heating is its energy efficiency. By harnessing electric power to generate heat directly beneath the floor, ThermoSphere systems minimise heat loss and provide precise temperature control, resulting in reduced energy consumption and lower utility bills. This eco-friendly approach aligns perfectly with the growing emphasis on sustainability in modern living.

Moreover, ThermoSphere offers a wide range of heating solutions to suit various applications and preferences. It’s the first and only heating cable to combine TwistedTwin and in-line joint construction, making it stronger, more durable, and more reliable. There are 12 sizes available ranging from 12m to 200m, so whether you're renovating your home, constructing a new build, seeking to upgrade your existing heating system, or working on a large-scale flooring project, ThermoSphere has versatile options tailored to meet your needs. From underfloor heating mats and cables to insulating underlays and programmable thermostats, ThermoSphere provides everything you need to create a cosy and efficient heating solution for your space.

The Benefits Of ThermoSphere Ultimate

  • Faster installation – As ThermoSphere Ultimate is the only heating cable to combine in-line joint technology with TwistedTwin cable construction, installation becomes a one-step, tool-free process. There’s no need to cut into the membrane or the subfloor to bury a bulky cold tail joint which takes away the hassle you get with other heating cables. It also significantly reduces any chance of accidently damaging the cold tail joint during installation.
  • Compatible with popular heating and decoupling mats – No matter what heating and decoupling you prefer, ThermoSphere Ultimate is compatible with every one of them. This means you can use your preferred brand of heating and decoupling mat with the easiest to install heating cable.
  • Guaranteed reliability - ThermoSphere Ultimate® is the first heating cable to give you guaranteed reliability, which means there’s little to no chance of the cable failing when it’s installed correctly. If the cable fails in the first 12 months of installation due to a manufacturing fault, ThermoSphere replace the system for you, as well as the floor. But this is subject to confirmation of successful warranty registration.
  • A cable size for every type of project - There are 16 different ThermoSphere Ultimate cable sizes to choose from ranging from 12m to 200m. This reduces the need for installers to use multiple cables on a project.

“ThermoSphere Ultimate® is an excellent example of innovation in the flooring industry where creative thinking and smart technology have come together to address real installation issues.” -
- Bridgette Kelly, the organiser of National Flooring Awards

“ThermoSphere’s Ultimate® Membrane Heating Cable is so good. I don’t have to cut out holes for the joints, I can just press the cable into the mat. It’s loads less hassle and I never have to worry about cable damage or revisiting a job.”
- Chris Field, owner of CJF Electrical Services

Underfloor Heating
Underfloor Heating

The Process of Fitting ThermoSphere Ultimate: A Simple One-Step Process

Because of the in-line joint technology, installation is a one-step, tool-free process with ThermoSphere Ultimate. Essentially, it means you don’t need to cut into the membrane or the subfloor, which takes away the hassle you get with other cables.

For same-day fitting and tiling, we suggest you use it in conjunction with the Thermosphere Underfloor Heating Decoupling Membrane Mat. However. it’s also compatible with all available membrane mats, so you can keep using your preferred underfloor heating mats.

How To Stop The Risk of Underfloor Heating Cable Damage

Underfloor heating with bathtub in the background

By removing bulky hot-to-cold cable joints it removes a major risk to cable failure. By specifying and installing ThermoSphere Ultimate you remove the need to cut the membrane mat or floor, the number one cause of repair in electric underfloor heating installations; preserving the waterproofing layer. Therefore, there’s no more risk of damage to floors or cable installations.

Choosing The Right Thermostat For The System


Central to the functionality of any underfloor heating system is the underfloor heating thermostat, and ThermoSphere excels in this regard with its state-of-the-art thermostat options. Designed for intuitive operation and precise temperature management, ThermoSphere thermostats offer users unparalleled control over their heating systems.

Here are our top suggestions of Thermosphere Thermostats:

  1. Thermosphere Underfloor Heating BT21 Bluetooth Programmable Thermostat
  2. Thermosphere Underfloor Heating SmartHome Control Thermostat
  3. Thermosphere Underfloor Heating Dual Control Touch Thermostat
  4. Thermosphere Underfloor Heating Programmable Control Touch Thermostat
  5. Thermosphere SmartHome Hub
Read More:

For those seeking guidance on optimising their ThermoSphere thermostat, detailed instructions and manuals are readily available on product pages in the ‘attachments’ area. Whether you're adjusting settings, programming schedules, or troubleshooting potential issues, ThermoSphere provides comprehensive resources to ensure a seamless user experience.

How Easy Is ThermosSphere Ultimate To Install?

ThermoSphere Ultimate has been purposefully designed to make installation of electric underfloor heating easy. Firstly, you can choose between two different outputs which is done by changing the spacing between the cable. For an output of 195W/m2 (ideal for wet rooms) use a two-stud spacing and for an output of 130W/m2 (great for well-insulated rooms), use a three-stud spacing. Secondly, once you’ve decided your output, simply press the cable into the membrane mat, covering the whole of the heated area, and you’re done. Because there are no bulky joints or thicker cold tail cables, installation is a one-step process. The membrane and heating cable are automatically flush and ready for tiling.

Watch: Installing ThermoSphere Ultimate - Electric underfloor heating system


Disclaimer: Always consult a professional electrician for any electrical installations.

Embracing the Future of Heating

Many people ask themselves the question is electric underfloor heating expensive to run? and what the pros and cons of underfloor heating are, but as we move towards a future defined by sustainability and technological advancement, ThermoSphere underfloor heating stands as a shining example of innovation in electric heating solutions.

With its cutting-edge technology, energy efficiency, and user-friendly design, ThermoSphere underfloor heating is poised to transform the way we heat our homes for years to come.

Whether you're a Tradesman, Builder, Tiler, Floorer, Architect, or even a DIY'er we've got you covered. Going the extra mile for our customers is second nature to us, so if you can't find what you're looking for on the website please do not hesitate to get in touch with our sales team on 03303 209900 or email your queries to [email protected].