Best Underfloor Heating Thermostat | Top Picks of 2023


Our reviews are long and detailed. We aim to equip readers with the best possible insight in order help them make informed decisions.

An underfloor heating system is a type of system that heats up the floor when it’s cold outside. It makes sure you’re toes stay warm and toasty.

Well, you’re going to need a thermostat to make that happen.

Choosing the right thermostat for underfloor heating can get a bit tricky with the following aspects to keep in mind;

Compatibility: You don’t want to be stuck with a thermostat that isn’t compatible with your underfloor heating system. It’s like trying to fit a square peg into a round hole, it just won’t work!

Cost: An underfloor heating thermostat can be expensive. You might have to pay more than you bargained for to get a thermostat that is reliable and works well with your system.

It’s like buying a fancy coffee – you have to decide whether the cost is worth the comfort it will bring.

Complexity: Some underfloor heating thermostats can be a bit complicated to install and use.

Accuracy: If your thermostat isn’t calibrated correctly, it might not keep the temperature at the right level.

Reliability: Of course you need a thermostat that’s reliable. You don’t want it to suddenly stop working leaving your toes frozen.

Well, in this article we will introduce you to the best underfloor heating thermostats that our team of smart home tech enthusiasts spent months rigorously testing to make sure you get a bang for your buck! 

Let’s dive in!

Short on time?


We have covered the in-depth review of our top picks below. To discover more interesting facts about your next smart home purchase, continue reading. We have done the homework for you!


Here’s the #1 Best Underfloor Heating Thermostat in 2023 with all the Bells & Whistles


1. SunTouch 500850 – Best Overall

best smart thermostat for underfloor heating

Key Takeaways: The best Wifi programmable thermostat for underfloor heating that is made to last and provide the best value for money!

Simple and intuitive programming instructions and very easy to install.

This unit is designed by electric floor heating experts with over 30 years of experience.

SunTouch offers the perfect solution for warming tile, stone, wood, laminate, and other floor coverings.

With thousands of successful installations across North America and a voluntary 30-day return guarantee.

You will not have to deal with a complex user interface and unclear or vague instructions.

And you will certainly not face any compatibility issues either. It works with both 120V and 240V system.

However, it could burn a hole in your pocket but it’s worth every penny.




The SunTouch smart underfloor heating thermostat for electric heating is designed to meet the needs of even the most picky individuals.

  • Features

This programmable thermostat offers smart features including the floor and air sensing modes in this thermostat automatically adjust for daylight saving time, so you can sit back, relax, and let the SunTouch Thermostat handle the nitty-gritty details

While the intuitive 7 day programming schedules make sure that you floors are always on the right temperature when you need them.

The ‘Away’ mode provides added peace of mind, allowing you to leave your home with confidence knowing that your floors will not be heated unnecessarily while you’re away.

With its dual-voltage 120/240 VAC capability and built-in GFCI for safety, this thermostat ensures your comfort without compromising on security.

But that’s not all – the SunTouch Thermostat features the ingenious SmartStart technology. No more freezing mornings or evenings spent waiting for your floors to warm up.

This brilliant feature automatically adjusts the start time of the floor warming system, so you step onto perfectly heated floors precisely when you need them.

The built-in 15 amp relay control ensures that your electric floor heating is working at its optimal performance.

The energy use monitor allows you to track your thermostat’s operation hours, enabling you to manage your energy consumption effectively.

It comes with a sleek and modern design with a thin profile and a 3.5 inch digital touch-screen display which is large enough for anyone that makes it easy to read and operate.

  • Installation

Worried about installation? Don’t be! The SunTouch Thermostat comes with a built-in 15-amp relay that effortlessly controls up to 150 sq. ft. (1800 watts) at 120V or 300 sq. ft. (3600 watts) at 240V.



Reasons to Buy

  • Installation, setup and programming the thermostat is effortless!


  • The back light color is customizable.


  • The display doesn’t stay on the whole time. To turn it on you simply tap your finger on the screen.


  • It also comes with a screen lock feature that locks the settings to prevent guests/children from interfering or for when you want to clean the screen without messing up the settings, this feature comes in handy.


  • It is easily interchangeable even if your old unit is as old as the pyramids.


  • You get to control both floor and air temperatures with this unit.


  • Easy to follow instruction manual.


  • Easy to read display with large temperature readings that are spot on.


  • Offers a 30-day return policy.



Reasons to Avoid

  • You could be unfortunate enough to receive a defected product where the thermostat would malfunction causing it turn on and off on its own.

We also received a defected unit when we bought it online. However it got replaced instantly, thanks to the support team who were very polite and cooperative.


  • If you’re not tech savvy, then you may find yourself struggling to install radiant floor heating thermostat on your own. It is recommended to seek professional help in this regard.


  • This underfloor heating thermostat is a bit expensive compared to other smart thermostats for underfloor heating in the market.


  • It has limited advanced features and cannot be integrated to a smart home system.


Whether you’re looking for a thermostat that is easy to install and use or you want a unit that can help you save money and energy, the SunTouch 500850 is the best underfloor heating thermostat that is the perfect solution.

2. Schluter Ditra – Best Runner-Up

electric underfloor heating thermostat

Key Takeaways: The best runner up programmable thermostat for underfloor heating that gets the job done and is one for the most reliable radiant heat thermostats out there.

Seamlessly integrates with a range of flooring materials such as tile, stone and laminate.

With its 5mA built-in GFCI, you can enjoy a safe and comfortable experience all year round.

Offers a 30-day return guarantee that is unbeatable in our opinion as based on our experience,

Low quality thermostats easily reveal their true colors with-in a week and if they don’t then you’re lucky you signed up for a thermostat that can last long.

Extremely easy to use with a very beginner friendly user interface.

Easy to read, clutter-free display with big temperature readings.



Reasons to Buy

  • Installing the thermostat is like a cakewalk.


  • Programming and setup is fairly intuitive and beginner-friendly.


  • A very reasonable price on Amazon for the value compared to other retailers.


  • Dead accurate temperature readings of the floor.


  • Easily replaceable with your old thermostat for underfloor heating.


  • Extensive manual with easy to follow instructions.


  • A very transparent and intuitive interface.


  • The display is vibrant, easy to read and use.



Reasons to Avoid

  • The interface is a bit basic and may look outdated to some users.


  • Customer support is not very supportive you could be made to wait on the line for long periods of time.


  • There’s a possibility that you might receive a faulty unit but you can always get it replaced.


  • If takes you longer than 30 days to figure out that its faulty then it cannot be replaced since the manufacturer does not entertains the warranty for products sold on Amazon.


Experience the comfort and convenience of the Ditra underfloor heating thermostat and let us know in the comments how it worked it out for you!

3. Honeywell Home THR842DEU – The Radiant Regulator

best electric underfloor heating thermostat

Key Takeaways: Best easy to use traditional looking non-programmable thermostat for underfloor heating without a learning curve.

The perfect solution for both wired and wireless installation.

This thermostat is big on saving energy and money simultaneously while keeping you as comfortable as possible.

It works seamlessly with old boilers even a 25-year-old gas condensation boiler, eliminating the need for a costly upgrade.

The burner no longer takes a long time to light up, resulting in shorter heating cycles and increased accuracy in regulation.

This thermostat for underfloor heating offers various advanced settings that can be customized to meet individual preferences and requirements.

The Honeywell thermostat features TPI software, providing superior intelligence compared to other brands.

The Eco function is an undeniable plus, allowing users to lower or increase the deposit for a specified period instead of relying on a static schedule.

The device switches the heating on and off at the correct temperature, as verified by a separate thermometer.




  • Features

This underfloor heating thermostat enables you to set your preferred temperature range between 5°C to 35°C, ensuring the perfect climate for your comfort.

The intelligent self-learning technology (TPI) adapts to your lifestyle, optimizing energy consumption without sacrificing warmth.

With one touch ECO button you can easily to a lower set-point for a time period giving you complete control over your home temperature.

Want to reduce the temperature for just an hour? No problem! Need to conserve energy for a full 24 hours? You got it!

In addition to its smart features, the Honeywell Thermostat for Underfloor Heating offers installer mode, allowing customization to suit your specific needs.

It establishes reliable, two-way wireless communication, ensuring seamless connectivity and even includes a signal strength test to guarantee optimal performance. (it’s available in both wired and wireless)

  • Interface & Installation

The extra large display with a simple interface makes it easy even for elderly people to operate the unit.

Mounting is a breeze, and with batteries included, you can start enjoying the benefits right away. Battery change is a snap too – just unclip the front cover, and you’re good to go.

No programming or learning curve required.

  • What’s in the box? 

When you open the box, you’ll find everything you need to get started: the thermostat, relay box receiver, accessories, and an instruction manual to guide you through the setup process.

The thermostat’s compact dimensions of 3.54 x 1.14 x 3.62 inches ensure it won’t overpower your wall.



Reasons to Buy

  • Easily interchangeable with your old thermostat.


  • Can be used with or without a C wire.


  • Very accurate temperature readings and it is built to last.


  • This thermostat doesn’t need to be more complicated, its as simple as it can get and gets the job done.


  • You get full control over your heating and cooling systems and not let some “smart” algorithm control it for you.


  • Clear and easy to understand instructions in all languages.


  • Overall, very affective thermostat for underfloor heating.



Reasons to Avoid

  • While they are neat looking, they are still look quite chunky when installed.


  • It could be tedious for most users to pop the back open for the batteries.


  • The battery life is relatively short and requires frequent replacements.


With reliable two-way wireless communication and a signal strength test, you can feel confident that your floors are always at the perfect temperature with the Honeywell THR842DEU.

Final Thoughts

Recommended Reads for DIY-ers:

“how does radiant floor heating work?”

“how to fix radiant floor heating?”

“how to control radiant floor heating?”

In conclusion, the right thermostat for underfloor heating can make a significant impact on your home’s energy efficiency and overall comfort.

Our team of Meta Domotics have reviewed some of the best underfloor heating thermostats on the market, taking into account their features, compatibility and more.

While each of the thermostats we discussed have their own strengths and weaknesses,

It ultimately comes down to your personal preferences and needs.

Whether you’re looking for advanced programming options, smart home integration, or a simple straight-forward design,

There’s a thermostat out there that can meet your requirements.

We hope this guide has helped you in making an informed decision and find the best underfloor heating thermostat.

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