Underfloor heating systems bring a lot of joy into our homes and commercial spaces. It offers comfort and better moods, especially when the temperature is set perfectly. However, to have the perfect temperature, you need to have a thermostat in place to help you control it.
But how do you choose the best thermostat? And which one is most compatible with your underfloor heating system? We have all the answers for you in this guide, as well as how to install your chosen thermostat.
Let’s get started.
Key takeaways
- You can choose from manual, programmable and smart thermostats.
- Before installation, you need to prepare by gathering the right tools and equipment, putting in place safety precautions, and choosing the right thermostat.
- The installation and setup for electronic and hydronic underfloor heating systems is similar, with a few differences you need to take note of.
- Always perform tests after you’ve installed a new thermostat.
Types of thermostats for underfloor heating
For both water and electric underfloor heating, there are various types of thermostats you can choose from for your system. Below are the main ones that homeowners and commercial buildings opt for:
Manual thermostats
A manual underfloor heating room thermostat is the most basic option out there, and probably best suited for those who want something simple to control. They come with an on/off switch or dial that will start or end your underfloor heating. Sometimes, there is the option to manually adjust the temperature too, depending on the model. Otherwise, it should have a temperature sensor to keep the environment at the optimal level.
Pros:
- Ease of operation: With no or very little setup.
- Affordable: Usually the least expensive type of thermostat, providing an inexpensive option.
- Less is more reliability: Fewer components means less things to break.
Cons:
- Manual adjustments required: This means you do not have automatic control at your disposal, leading to inconvenience as well as a lower energy efficiency.
- Base capability: Limited only to basic temperature control without any scheduling etc.
- No remote capabilities: If you forget to adjust your settings in the morning, or when going on a trip that day, you do not have an option for controlling it remotely so it really limits control.
Programmable thermostats
Compared to a manual option, programmable thermostats come with a digital interface which allow you to adjust the temperature for different times and days. You can choose to have it colder in the mornings and warmer in the evening when you come home from work. There are often some other intuitive controls to make things easier, and some models even have multiple programming options.
Pros:
- Energy efficient: By automatically reducing temperatures during non peak hours, it can lead to great energy savings.
- Easy to use: After you set your preferred temperatures once, the thermostat does all of the work for you, so there’s less fussing with manual adjustments.
- Custom scheduling: Programming heating according to your lifestyle and needs.
Cons:
- Complexity: The first-time setup of the thermostat is often much more complex compared to manual thermostats, due largely in part to needing to program them correctly.
- More expensive: Typically cost more than manual thermostats, but still less expensive than smart thermostats.
- Limited remote access: Programmable thermostats can have limited remote access, although if the thermostat is an advanced programmable model it might be able to.
Smart thermostats
Smart thermostats for underfloor heating are the most complex but innovative options. They connect to your WiFi, allowing for remote access from your smartphone or any other device. You also have the option to integrate it with a smart home system such as Amazon Alexa or Google Home. After time, a smart thermostat for electric underfloor heating or other systems learn your schedule and adapt the temperature according to it, as well as provide you with energy usage reports to try and achieve more savings.
Pros:
- Most convenient: Delivers the most convenience with remote access, voice control and automation.
- Energy saving flexibility: From innovation and learned behaviour, heating schedules can be configured to operate the most cost effectively.
- Advanced capability: It comes with Energy usage tracking, weather prediction control and integration with other smart home devices.
Cons:
- High initial cost: The initial cost is usually higher than the other thermostat options, but this can be offset by electricity savings over time.
- Complexity: Installation can be more complex requiring some level of technical know-how or professional installation.
- Potential privacy issues: As is the case with any connected device, there are generalized privacy and security issues concerning transmission of data and storage.
Pre-installation preparation
Before you add a thermostat to your underfloor heating system, there are some precautions and preparations you need to take to ensure the best results and that you’re happy with your thermostat:
Tools and materials needed
- Screwdrivers (flathead and Phillips)
- Wire strippers
- Pliers
- Drill and appropriate bits
- Voltage tester or multimeter
- Level
- Electrical tape
- Pencil or marker
- Tape measure
Materials:
- New thermostat (manual, programmable, or smart)
- Mounting hardware (screws, anchors)
- Electrical wiring (if needed)
- Wire nuts
- Wall plate (if needed)
- User manual and installation guide (typically provided with the thermostat)
Safety precautions
Electrical safety
Always turn off the power supply to your underfloor heating system and thermostat circuit at the breaker panel before commencing any work. Then double check with a voltage tester or multimeter to be sure it is completely dead. Be sure the correct circuit is off by testing the wires at the thermostat location to prevent electric shocks.
Follow local electrical codes and regulations at all stages. When in doubt, or if you find any step confusing, be sure to check with an accredited electrician for safety and code compliance.
Handling tools and equipment
For tools and equipment, try to only use those that are functioning properly for the intended purpose as faulty or unsuitable tools can lead to accidents. When at the job site, avoid electrical injuries and protect yourself from cutting yourself on sharp objects by wearing safety glasses and gloves. Make sure your working area is dry and follows precautions to prevent any slips or falls.
Choosing the right thermostat
When looking for the perfect underfloor heating thermostat, there are two main considerations you must take into account.
Compatibility with your underfloor heating system
- System compatibility: Ensure that the thermostat is able to work with your type of underfloor heating system (electric or hydronic). Visually check the product specifications and reference manufacturer guidelines when required
- Voltage: Make sure the thermostat is compatible with your heating system’s voltage. For electric underfloor heating, this can easily be addressed by installing an appropriate 120V or 240V thermostat. However, water systems often have more specific requirements.
- Wiring: Make sure the new thermostat wiring is compatible with your heating system’s existing layout. Some thermostats may need additional wiring or other settings.
User preferences and needs
- User friendliness: Ask yourself, is the thermostat easy to use? The basic functions of manual thermostats are easy to understand, whereas programmable and smart thermostats provide enhanced features that can be a bit more sophisticated.
- Establish the features: Write down points which are necessary for your requirements. Programmable thermostats offer scheduling and energy-saving settings, while smart thermostats provide remote access along with integration to a home automation system such as Amazon Alexa for voice commands and advanced performance management.
- Budget: Weigh the price of the thermostat compared to what you get for your money in the long run. Although a little more costly, smart thermostats can potentially save you on your energy bills in the future and make keeping your home comfortable much easier.
- Design: Check the style and design of the thermostat. It should blend nicely with your home both physically and visually so it doesn’t stand out like a sore thumb.
Step-by-step installation guide for electric underfloor heating thermostats
Once you have your thermostat ready, it’s time to install it so it works seamlessly with your underfloor heating. Here’s the installation guide if you have an electronic system:
Turn off the power supply
The power supply to the underfloor heating system and thermostat circuit should be disconnected from the breaker panel prior to installing. Make sure to find and use a voltage tester or multimeter so you can rest assured the power is 100% off, ensuring your safety in doing so.
Remove the old thermostat (if applicable)
If replacing an existing thermostat, remove the old thermostat from the wall carefully by unscrewing it and disconnecting all wires. Attach a label on the wires so you can remember where to attach it when installing your new thermostat.
Mount the new thermostat
Place the new thermostat on to a wall of your choice or where your old thermostat was located. Level everything to adjust the rack properly, then mark the mounting holes. If necessary, drill pilot holes and mount wall anchors – then screw the thermostat mounting plate into place in the wall.
Connect the wiring
Follow the wiring diagram for your new thermostat. Attach the labeled wires coming out of the wall securely to their opposite terminals on your thermostat. Make sure connections are steady and tight. If you have to join wires use wire nuts and cover the exposed ends of improved wiring with electrical tape for safety.
Secure the thermostat in place
Attach the thermostat unit with a mounted base plate and secure it (it will click or screw in place). Make sure it is level and securely fixed to the wall.
Restore power and configure settings
Return power to the breaker panel. Configure the initial settings of date, time and desired temperature by following the user manual of the thermostat. Set up any schedules or extra functionalities you want.
Test the thermostat
Before signing off on the installation, you should do a couple of checks with the thermostat. Raise the thermostat a few degrees and check to see if the heating system comes on as it should. Do the same for lowering a temperature and make sure that the system will turn off. Watch and ensure the thermostat is operating consistently by checking a few different cycles.
Step-by-step installation guide for water underfloor heating thermostats
Here is a guide for a water underfloor heating thermostat. It’s very similar to the previous guide, with a few minor changes:
Turn off the power supply
Start by cutting the power supply to both your underfloor heating system as well as the circuit on which your thermostat is running from at the breaker panel. If you want to be sure, check it using a voltage tester or multimeter to make sure the power is completely off.
Remove the old thermostat (if applicable)
Take out your old thermostat if you have one, and do it carefully. Some units may not be very sturdy due to their age or which brand made them.
Mount the new thermostat
Position the new thermostat at the same or a new location on the wall. Use a level to ensure it is properly aligned. Mark the mounting holes, drill if necessary, insert wall anchors, and screw the mounting plate into place securely. Ensure that the new thermostat is placed where it can accurately gauge room temperature, away from direct heat sources and drafts.
Connect the wiring
Refer to the wiring diagram that came with your new thermostat. Identify the labeled wires from the wall, and connect them to their respective terminals on the thermostat. In hydronic systems, verify that the wiring is properly connected to zone valves or control relays as required by system usage. Verify that all connections are fitting correctly and use wire nuts to connect wires together as necessary.
Secure the thermostat in place
Secure the thermostat unit to the mounted base plate. Make sure it is flat and perfectly patched against the wall for no unwanted disconnections.
Restore power and configure settings
Flip the power back on at the electrical panel. Refer to the thermostat user manual for setup instructions and choose initial settings, such as date and time or specific temperature. With the runtime determined you can program a schedule on your thermostat based on the model.
Test the thermostat
Following installation, test the thermostat to make sure it is working and controlling your hydronic radiant heat accurately. Raise the temperature setting and verify that zone valves or pumps operate as required. Reduce the heat and ensure that it works by shutting down the system. Make sure to monitor the thermostat and heating system while going through a full cycle to ensure that everything is running as it should.
Conclusion
Thermostats and underfloor heating systems go hand in hand like bread and butter. You need a thermostat to enjoy the benefits of your heating on the fullest. However, it does need to be installed properly by following the steps above for the best results.
If you don’t have the technical know-how required to install a thermostat, then you don’t need to worry. Next Level is here to help, providing expert installation in Glasgow, Edinburgh, and surrounding areas. Our engineers have been installing underfloor heating systems and thermostats for decades and can provide a helping hand when you need it. Contact us today.