Electric heating FAQs

ThermoSphere HQ is located in the heart of the Kent countryside, in Marden to be exact. Our address is:

Bridge House
Pattenden Lane
Marden
Kent
TN12 9QJ

Head on over to the contact page for directions and details.

All orders from retailers for next day delivery need to be placed by 4.30pm Monday to Friday.

There are charges for returning goods. This includes a 20% admin fee and £15 for us to collect. The collection charge includes a maximum of two boxes. If there are more than two boxes, an additional charge of £7.50 will be applied per extra box.

Pallet charges will also apply.

No we don't. We are lucky enough to have an extensive network of brilliant retailers.

You can buy ThermoSphere electric heating from a wide range of retail partners throughout the UK. Partners include; bathroom shops, tile shops, merchants and electrical wholesalers.

Every system is different because of the insulation value of the property, type of flooring used and the level of insulation below the heating system.

You can use our running cost calculator to estimate to get a good idea on how much it will cost to run.

Many of our electric underfloor heating systems can be installed in just one day (depending on the size of the system). After installation you must allow time for any adhesives to fully cure before switching your system on. This is usually around 1-2 weeks.

It is perfectly safe to install a ThermoSphere Mesh or Membrane system in a bathroom. ThermoSphere Mesh is protected to IP68 standards which means it can be placed in zone 1 of a bathroom with no issues. ThermoSphere Membrane can be used a fully waterproof solution and is ideal for wet rooms. However, the thermostat should be installed away from water sources.

Yes it can! Electric underfloor heating can also be used as a primary heat source for large spaces but one thing that is holding it back is the current cost per kWh of electricity is much higher than the cost of gas. If you were to install electric underfloor heating in the same sized room as you installed a wet system, the room heated with the electric underfloor heating would cost 3x – 4x as much to run.

It sure can. In fact we've written a comprehensive guide to repairing electric underfloor heating which will help to alleviate any concerns you may have.

There is a simple calculation to work this out.

Floor Area (m2) – Area taken up by fixed units (m2) = Total Underfloor Heating (m2)

What do we mean by fixed units?

As an example, let’s take a typical bathroom. The fixed units will be things like the bath tub, sink and toilet. Also, it is worth considering what furniture you will be having in the room. Any type of flat-bottomed furniture like sofas and bookcases will restrict the airflow to the floor and in turn cause ‘thermal blocking’. This can result in the heating cable overheating causing damage to the floor above. So, if you are planning to have this type of furniture, we would recommend including these as ‘area taken up by fixed units’ within your calculation.

Yes, it can be shortened. Minimum length is 1m.

Yes, if the country has 230v power supply.

We always recommend using insulation board because it helps to improve the efficiency of the electric underfloor heating system by up to 50%! This also means that it will cost you less to run.

No – never. Cutting the heating cable will alter the resistance and cause the element to overheat. If you cut the cable by accident, please contact us.

Yes you do.

ThermoSphere Mesh is only 3.5mm thick.

It comes with a lifetime warranty. However, you must remember to register your warranty.

Ardex AF 200 plus or flexible S1 tile adhesive

Absolutely! However our heating cable is specially designed to fit perfectly with the studs of the membrane mat.

Yes you can. You will achieve an output of 97.5W/m²

It comes with a lifetime warranty. However, you must remember to register your warranty.

New Membrane Cable (launched April 2023) doesn’t have a visible joint between the hot and cold sections of the cable, so it’s the same thickness from the end termination all the way up to the end that is connected to the thermostat. 

Yes you can. In fact it works with all membrane mats currently available in the market.

For the most part you do, but we have made it easier. With the new Membrane Cable there's no need to cut into the membrane or insulation board to bury a bulky cold tail joint.

It comes with a lifetime warranty. However, you must remember to register your warranty.

No, ThermoSphere Foil is designed to go under wood, carpet or vinyl. It's better to choose either ThermoSphere Mesh or ThermoSphere Membrane for tiled floors.

The tog rating should not exceed 2.5tog. This includes the carpet, underlay and also 0.5tog for the HDF overlay board.

Grey hole side up and red side down.

It comes with a lifetime warranty. However, you must remember to register your warranty.

Easy! Multiply the length of the cable by 4.

Divide the length of the cable by 6.

The short answer is no. But here’s why.

Thermostats like Nest are designed to switch low electrical current systems of up to 3A. Electric underfloor heating systems are high current systems and can be up to 16A and therefore you will need additional wiring and relays to use a thermostat such as Nest. However, the Nest Thermostat has no problem in controlling wet underfloor heating systems.

There is also another key reason. With an electric underfloor heating system, the recommended maximum temperature to run it is 27 degrees Celsius. This is particularly important for wood or carpeted floors because any higher could result in damage to the floor finish. Typically Nest and Hive thermostats measure temperature of the air and not the temperature of the floor so you are unable to effectively set a safe temperature for the floor (i.e. 27 degrees Celsius) and therefore incur a greater risk of unwanted damage which will cost you both time and money to fix.

Yes! As long as the sensor probe is 10k rated.

36m² at 100w, 24m² at 150w, 18m² at 200w.

Sensor probes work on resistance. Each temperature value is translated to a resistance value by the sensor. Each type of sensor relates resistance to temperature in a different way. For example, if you used a 15K probe in a thermostat that is programmed to read a 10K probe the temperature readings will be incorrect.

Yes. But you need to make sure the total load of the underfloor heating doesn’t exceed the maximum load of the control. Check the total load on the back of thermostat or ask an electrician.

Unfortunately it's a no.

Yes they all are apart from the Manual Thermostat.

You can choose between either black or white.

Yes you can but the heating temperature in the program will need to be set to manual temperature.

We've created video guides that cover everything from installing thermostats to setting up heating schedules. However, if you still get in a pickle, contact one of our helpful team.

No. It uses Bluetooth to connect to your phone so there is no internet connection. That makes connecting easy and reliable with no routers, hubs, passwords or wires.

Bluetooth is one of the most secure wireless connections to use and more secure than Wi-Fi. It also means you don‘t waste time remembering passwords or worry if your internet goes down.

Yes you do! You have to confirm any changes made in the app by turning the dial. This is a security feature that means nobody else can tamper with your thermostats.

Lockdown Mode disables the dial and SET button on the thermostat to prevent tampering. You can unlock it with a pin code in the app. When Lockdown Mode is on, your thermostat will run the heating program as normal.

Yes you can! Simply use the dial to set the temperature that you want your heating to get to and the thermostat will maintain that temperature until you change it. It is best to use Comfort mode for this application. However, we recommend using the app to set up a simple heating schedule that will save you money on your heating bills and help the environment by using less energy.

You should be able to view your thermostat from around 10-15m away in most homes. But you have to be standing next to the thermostat to confirm changes so best to get up and have a little walk over to your thermostat.

Of course! What is this, 1987? 😜 The BT21 actually has the best possible EcoDesign score (40%) so you won‘t find a more efficient thermostat.

It's easy. Head on over to Apple's App Store or GooglePlay and search 'ThermoSphere' and you'll find it.

Yes you do. It's the only way to enjoy all of the benefits that the SmartHome Thermostat offers.

Up to 100 thermostats per hub, 10 hubs per app, and unlimited users (apps) per hub.

Yes you can! All you need is connection to the internet and then just use the ThermoSphere app to control your SmartHome Thermostat.

Setting up the SmartHome Themostat is simple. We've made it even easier with our collection of video guides.

You can choose between black or white.

The Dual Control Thermostat has two relays. A 16 Amp relay for electric underfloor heating and a 5 Amp relay for a electric towel rail or mirror demister.

Yes, but only in the Summer months when the electric element in the radiator is being used.

You can choose between black or white.

We have a wide selection of finishes available for both Towel bars and Towel Rails. We also offer a bespoke finish service which is ideal for projects which require a larger quantity. If you have a project that requires this service, talk to our Project Team.

Unfortunately we don't. We leave that to the expertise of our retailers. If you are looking for some design inspiration, we've got a collection of blogs in the Learning Zone that may whet your whistle.

You can install a maximum of seven towel bars on the mounting system. That is enough to make a beautiful design statement for any bathroom.

For the ultimate comfort, we recommend pairing the the towel bars with electric underfloor heating. Then, use the Dual Control Thermostat to control both in total harmony.

Absolutely! Because these towel bars are 12V SELV (Safety Extra Low Voltage), they are perfectly safe to use in wet areas.

The self-regulating heating element saves energy by using the minimum amount to regulate the temperature of the towel bar.

When the towel bar is not covered by a towel the element gently heats up. When a towel is placed over the rail the element keeps heating until it reaches the maximum temperature. The self-regulating cable kicks in and stops heating and maintains a warm temperature that will dry the towel but will not over heat.

There are six premium finishes available which all come as standard. These include:

• Diamond Polished
• Brushed Stainless
• Diamond Polished Brass
• Brushed Brass
• Matt Black
• Matt White

5 years.

They feature a stand-alone dry electric element meaning you don’t have to turn on your central heating just to dry your towel.

Multiflex wiring technology gives you the freedom to choose concealed or exposed wiring from either the left or right hand side of the towel rail.

They sure are! Bespoke finishes include:

• Matt Black
• Brushed Stainless
• Brushed Brass
• Polished Brass

5 years.

Use the self adhesive backing to fix it to the back of your mirror. Mirror adhesive should be applied around the perimeter of the mirror so it becomes as isolated as possible when fixed to the wall.

If you are installing your mirror into a rebate within the tiles, make sure you leave a 5mm gap around the perimeter of the mirror. Any contact with hard materials could result in damage to the mirror.

Both 12V and 230V options come with a 10 year warranty.

Each type of electric radiator has an IP rating of IP24. 

Yes they can! The maximum room size that the range can heat is 20m².

Electric heating is 100% energy efficient at point of use. All the electricity you use and pay for converts into heat. When you pay for 1kWh of electricity, 1kW of heat gets transferred into the room for one hour.

There are no moving parts which means that an electric heating system rarely breaks down. There are no water-filled pipes so there is less risk of property damage from burst pipework.

With electric heating you do not run the risk of carbon monoxide emissions or any combustible gas leaks making it one of the safest ways to heat your home.

You have probably heard that gas products are cheaper to run than electric ones, we're not here to deny that however there are plenty of long term benefits which make choosing an electric radiator an attractive and sensible option.

Electric powered radiators are 100% efficient and do not waste any energy, that means 100% of the energy generated is transferred to heat. Fantastic. Because of this, electric radiators require less energy to function, which can help save on energy costs.

What's more, you also gain a lot more freedom when it comes to installation as they do not require a plumbed central heating connection. Electric radiators also require far less maintenance than central heating powered radiators. With less moving parts, there is less to go wrong which typically means they last much longer.

The general rule of thumb is the larger the room, the greater the output wattage you will need. But it also depends on how well insulated the room is. For example, our 1200W oil filled electric radiator will comfortably heat a well-insulated room with a floor space of 13m² but only up to 12m² if it does not have adequate insulation. Even if you buy the next most powerful electric radiator, it won’t do any harm. It will just mean that it will turn off more often once the room has reached your desired temperature.

Another consideration is being able to accurately control and programme your electric radiator key to ensuring energy efficiency is maintained and heating bills don’t go through the roof. Each of our electric radiators are programmable and include a digital thermostat and can monitor the room temperature precisely. This means that the electric radiator turns on less often and doesn’t unnecessarily use more power than needed which reduces energy consumption.

You can set up your heating schedule easily directly using the control panel on the radiator. We've created a step by step video guide which will get you up and running fast.

The Oil Filled Radiator is available in outputs of:

• 600W
• 900W
• 1,200W
• 1,500W
• 1,800

The touch LED display allows for easy programming of your preferred heating schedule. Adjustments can be made with either the remote control or the app which both come as standard. You can even control it with Amazon Alexa using the Smart Life app. Watch the video to see how.

There sure is! The Glass Panel Heater is available in black or white.

The Glass Panel Heater can effectively heat a well insulated room up to 18m².

The Convector Panel Heater is available in the following outputs:

• 500W
• 1,000W
• 1,500W
• 2,000W

It can warm well-insulated rooms up to 18m².

The intuitive control panel with LCD display makes setting up the Convector Panel Heater simple. For a step by step guide, watch the video.

Our water heating range includes:

• Electric Flow Boiler
• Micro Electric Boiler

This isn't something we currently offer. However, our boilers are simple to install for any qualified tradesperson.

Fear not. We've got you covered. Simply contact one of the team on 0800 019 5899 who will be able to help organise this for you.