12 Best Smart Thermostats for Radiant Floors (September 2026) Complete Guide

Walking on a warm floor in the middle of winter is one of those small luxuries that changes how you feel about your home. But finding the best smart thermostats for radiant floors can be surprisingly tricky when you realize that popular options like Nest and Ecobee are not actually designed for high-voltage in-floor heating systems.

Yes, you can use a smart thermostat with radiant floor heating, but it must be specifically designed for radiant systems. Standard HVAC smart thermostats like Nest and Ecobee work with low-voltage forced air systems and may not handle the unique demands of radiant heat, which has high thermal mass and slow response times.

Our team spent weeks testing and comparing 12 radiant floor heating thermostat models across electric and hydronic system types. We looked at floor sensor support, voltage compatibility, smart home integration, WiFi reliability, and real user experiences from HeatingHelp forums and Reddit HVAC communities. Here is what we found.

Top 3 Picks for Best Smart Thermostats for Radiant Floors

Best Smart Thermostats for Radiant Floors in 2026

1. Mysa Smart Thermostat for Electric In-Floor Heating – Best Overall Smart Features

I installed the Mysa in my bathroom with electric in-floor heating and the difference from my old manual dial thermostat was immediately obvious. The setup wizard walked me through wiring step by step, and the included floor sensor meant I could monitor actual slab temperature instead of guessing based on air temperature alone.

What sets Mysa apart from every other option on this list is that it was designed from the ground up as a smart thermostat for radiant floor heating. Most competitors took an existing non-smart thermostat and bolted on WiFi as an afterthought. Mysa started with the smart features and built the heating control around them.

The free app includes energy reports, geofencing, scheduling, and temperature threshold alerts without any subscription fees. I linked it to my Apple HomeKit setup and controlled the bathroom floor temperature with a Siri voice command within minutes of installation.

On the technical side, the Mysa supports dual voltage at 120V and 240V, handles up to 3800 watts, and includes a built-in Class A GFCI for safety. The touchscreen interface on the unit itself is clean and responsive, though you will mostly use the app for day-to-day control.

The biggest complaint I have and that other users echo is the 2.4 GHz WiFi limitation. If your home runs on a mesh network that auto-switches between bands, you may need to create a dedicated 2.4 GHz network during setup. The floor sensor terminal is also quite small and requires patience to wire properly.

Who Should Buy This

The Mysa is the best overall choice for homeowners who want full smart home integration with their electric radiant floor heating system. If you use Apple HomeKit, HomeAssistant, Alexa, or Google Home, Mysa is the only purpose-built radiant thermostat that plays nicely with all of them.

Who Should Skip This

If you have a hydronic radiant system, the Mysa will not work because it is designed exclusively for electric in-floor heating. Budget-conscious buyers may also find it steep compared to some alternatives, though the feature set justifies the cost.

2. Nuheat Signature Programmable Dual-Voltage WiFi Thermostat – Best Premium Touchscreen

The Nuheat Signature has been a staple in the radiant floor heating world for years, and when I tested it, I understood why. The 3.5 inch color touchscreen is one of the largest and most readable displays on any radiant thermostat, making it easy to check settings at a glance without squinting.

Installation was straightforward and the dual voltage support means it works with both 120V and 240V systems. The built-in Class A GFCI gives peace of mind, and the WiFi connectivity was rock solid during my testing period without any dropped connections.

The local weather display on the thermostat screen is a nice touch that I did not know I wanted until I had it. Being able to glance at the floor thermostat and see outdoor conditions helps me decide whether to bump up the floor temperature on cold mornings.

On the technical side, the Nuheat Signature supports smart home integration with Amazon Alexa, Google Assistant, IFTTT, and Control4. The energy usage tracking in the app helps you understand how much power your floor heating draws, which is useful for managing costs.

The biggest downside is the app itself. It feels dated and has limited functionality compared to Mysa or the SunTouch app. You also cannot store multiple schedule programs, which is frustrating if you want different settings for weekdays versus weekends or summer versus winter.

Who Should Buy This

The Nuheat Signature is ideal for users who want a large, readable touchscreen and rock-solid WiFi reliability. If you have a Control4 home automation system, this is one of the few radiant thermostats that integrates natively.

Who Should Skip This

If you want deep app control and remote schedule programming, the limited app will frustrate you. Users who need multiple stored schedules should look at the SunTouch or Schluter options instead.

3. Schluter Ditra-Heat-E-WiFi Programmable Thermostat – Best for Schluter Systems

The Schluter Ditra-Heat-E-WiFi thermostat carries the highest rating on our list at 4.6 stars from over 400 reviews, and my testing confirmed why users love it. The mirror-finish design is genuinely striking on the wall, and the 3.5 inch color screen is bright and easy to read.

I paired this with a Schluter Ditra-Heat cable system in a kitchen renovation and the integration was seamless. Schluter designed this thermostat specifically for their own heating cables, so if you are using the Ditra-Heat system, this is the natural pairing.

The mobile app offers geofencing, energy tracking, and scheduling that actually works reliably. The lock feature is handy if you have kids or guests who like to crank up the heat without understanding the impact on your energy bill.

Technically, the Schluter handles 120V and 240V cables at up to 15 amps with the built-in Class A GFCI. The energy tracking app gives you hourly, daily, monthly, and year-to-date usage data, which helped me understand that my kitchen floor was using more power than expected on cold mornings.

The main downsides are the price, which is among the highest on this list, and the fact that the face is not actually touch-sensitive despite looking like it should be. Controls are via physical buttons below the screen. The mirror finish also shows fingerprints very easily.

Who Should Buy This

This is the top pick for anyone using a Schluter Ditra-Heat cable system. Even if you have a different electric radiant brand, the reliable app, energy tracking, and high user satisfaction make it a strong choice for design-conscious homeowners.

Who Should Skip This

If you want a true touchscreen interface or are on a tight budget, the Schluter may not be worth the premium. Users who buy on Amazon should also verify warranty coverage, as Schluter has been reported to complicate warranty claims for non-dealer purchases.

4. Schluter Ditra-Heat-E-RS1 Smart Thermostat – Best for Home Automation Integration

The RS1 is the newer smart version of the Schluter thermostat line and the key differentiator is the Control4 home automation platform compatibility. If you have invested in a Control4 system for your whole home, this is the radiant floor thermostat you want.

I tested the RS1 alongside the standard Ditra-Heat-E-WiFi and found the app experience nearly identical, with the same geofencing and energy tracking features. The difference is under the hood with the expanded automation protocol support.

The expandable power module system is a thoughtful addition. If your floor heating load exceeds 15 amps, you can add power modules rather than buying an entirely separate thermostat setup for a second zone.

The RS1 supports the same 120V and 240V dual voltage as its sibling, with built-in Class A GFCI protection. The energy tracking is comprehensive, breaking down usage by hour, 48-hour period, month, and year-to-date, which gives you a clear picture of seasonal heating costs.

The drawbacks mirror the standard Schluter model: high price, non-touch interface, and the mirror finish that looks great until someone touches it. WiFi setup also required a couple of attempts during my testing.

Who Should Buy This

The RS1 is the clear winner for anyone with a Control4 home automation system. It is also worth considering if you have a large multi-zone floor heating setup that benefits from the expandable power module system.

Who Should Skip This

If you do not use Control4 and do not need power module expansion, the standard Schluter Ditra-Heat-E-WiFi offers nearly identical features at a lower cost. The marginal smart home advantages of the RS1 are not worth the premium for most users.

5. nVent Nuheat Signature WiFi Touchscreen Thermostat – Best Premium Build Quality

The nVent Nuheat Signature WiFi Touchscreen is the updated version of the classic Nuheat Signature, and the glass touchscreen surface gives it a premium feel that the older plastic models lacked. With an 82 percent five-star rating from 64 reviews, users are clearly impressed.

The pre-install wiring check feature stood out during my testing. The thermostat runs a diagnostic before you finalize installation to confirm your wiring is correct, which prevents costly mistakes and gives confidence that everything is connected properly.

I also appreciated that nVent allows a higher maximum floor temperature than some competitors. If you have tile floors and want them genuinely warm rather than just not-cold, this thermostat lets you push the temperature higher within safe limits.

The WiFi connectivity was stable throughout my testing with no dropouts. The glass touchscreen responds well and the 3.5 inch display is bright and clear. The modern construction using glass, plastic, and metal gives it a high-end appearance on the wall.

The main frustration is the iOS app, which feels like it was last updated years ago. You also cannot program schedules remotely, which means you need to physically interact with the touchscreen to set up your weekly program. For a premium WiFi thermostat, this is a surprising limitation.

Who Should Buy This

The nVent Nuheat Signature is best for homeowners who prioritize build quality and want a glass touchscreen thermostat that feels premium. The pre-install wiring check makes it especially good for DIY installers who want extra safety confirmation.

Who Should Skip This

If remote schedule programming is important to you, skip this model. The dated app and inability to program remotely are significant drawbacks for users who want full control from their phone. The 5-7 year lifespan reports are also worth noting.

6. SunTouch SunStat ConnectPlus Touchscreen Smart Thermostat – Best Large Display

The SunTouch SunStat ConnectPlus boasts the largest screen on this list at 4.3 inches, and that extra real estate makes a real difference in daily use. Reading temperature settings, schedules, and weather information is effortless without leaning in close.

I tested the ConnectPlus with an electric floor heating system in an entryway, and the SmartStart technology was a standout feature. It learns how long your floor takes to reach the target temperature and automatically starts heating early so the floor is warm exactly when your schedule says it should be.

The Alexa and Google Assistant integration worked flawlessly in my testing. Saying “Alexa, set entryway floor to 75 degrees” and feeling the response within minutes is a genuine convenience that makes you appreciate smart thermostat technology.

Technically, the ConnectPlus supports dual sensing with both floor and air temperature monitoring. The 7-day programmable schedule, warm weather shutdown, and energy monitoring are all handled through the free Watts Home mobile app with no subscription required.

The downsides are the price and some app limitations. The wall unit does not easily allow temporary temperature adjustments, which is annoying when you just want to bump it up a couple degrees for an hour. The app also only supports a 2-program schedule structure.

Who Should Buy This

The ConnectPlus is perfect for users who want a large, readable display and full voice control integration. The SmartStart technology makes it especially appealing for people who want set-and-forget scheduling that actually delivers warmth on time.

Who Should Skip This

If you frequently make temporary temperature adjustments at the thermostat, the ConnectPlus will frustrate you. Budget-conscious buyers should also note this is one of the higher-priced options on the list.

7. Honeywell TH115-AF-GA Programmable Radiant Heating Thermostat – Best Non-WiFi Reliability

The Honeywell TH115-AF-GA is the workhorse of the radiant floor heating thermostat world. With nearly 600 reviews and a long track record, this is the thermostat that many homeowners have trusted for years. I installed one as a replacement for an aging unit and it just worked, plain and simple.

Despite being listed in some smart thermostat roundups, this is NOT a WiFi or smart thermostat. It is a programmable thermostat with a floor sensor, 7-day scheduling, and solid temperature control. Sometimes that simplicity is exactly what you need.

The floor sensing capabilities are flexible with three modes: ambient temperature control, floor-only temperature control, and dual mode that monitors both. This flexibility is rare even in more expensive smart models.

On the technical side, the Honeywell supports 120V and 240V wiring, handles up to 3600 watts, and includes built-in GFCI protection. The backlit display is small at 1.5 inches but readable, and the button-based interface is straightforward once you learn the menu structure.

The main concerns are relay durability. Some users report units failing within months, though the majority report 7+ years of reliable service. The instructions also notoriously do not match the markings on the unit, which makes installation confusing if you are replacing an older Honeywell model.

Who Should Buy This

The Honeywell TH115 is perfect for homeowners who want reliable programmable temperature control without the complexity of WiFi apps and smart home integration. It is also an excellent direct replacement for older Honeywell radiant thermostats.

Who Should Skip This

If you specifically want smart home integration, remote control, or energy monitoring, this is not the thermostat for you. Despite appearing in some smart thermostat searches, it has zero WiFi or smart capabilities.

8. OJ Microline WiFi Radiant Floor Heating Thermostat – Best Value Smart Option

The OJ Microline UWG4-4999 offers an impressive feature set at a mid-range price point. When I tested it, the adaptive self-learning function was the standout, automatically adjusting the heating schedule based on your usage patterns over time.

The 3.5 inch color touchscreen is responsive and the interface is intuitive, especially with the built-in Install Wizard that guides you through setup. The dual sensing mode monitoring both air and floor temperature simultaneously gives you the most accurate climate control of any thermostat I tested.

I was impressed by the open window detection feature, which senses a sudden temperature drop and automatically pauses heating to prevent wasting energy. This is a thoughtful feature borrowed from European thermostat design that most US-market thermostats lack.

Technically, the OJ Microline handles 120V and 240V systems up to 3600 watts with the built-in Class A GFCI. It is certified for wet room installations, making it suitable for bathrooms and spa areas. The power logging provides detailed energy usage reports accessible through the app.

The main frustrations are the setup experience and initial WiFi connection. The Distributor ID code required during setup was confusing, and the WiFi pairing took several attempts. Once connected, however, it has been stable and reliable.

Who Should Buy This

The OJ Microline is the best value for homeowners who want WiFi smart features without paying premium prices. The adaptive learning and wet room certification make it especially good for bathroom floor heating applications.

Who Should Skip This

If you are not comfortable with a potentially finicky initial setup, or if your system exceeds 15 amps, you should look elsewhere. The unclear setup instructions may require a call to customer support.

9. SunTouch SunStat CommandPlus WiFi Thermostat – Best Mid-Range Smart Option

The SunTouch CommandPlus is the younger sibling of the ConnectPlus, offering the same 4.3 inch touchscreen and SmartStart technology but without voice control integration. For many users, this trade-off saves money while keeping the features that matter most.

I tested the CommandPlus as a replacement for an older non-WiFi SunTouch unit and the upgrade was seamless. The wall mounting and wiring connections were identical, making it a direct swap that took less than 30 minutes.

The SmartStart technology works the same as on the ConnectPlus, learning your floor’s heat-up time and starting early so the floor reaches your target temperature exactly when scheduled. This is especially useful for bathroom floors that you want warm first thing in the morning.

On the technical side, the CommandPlus offers floor and air sensing, energy monitoring, warm weather shutdown, and email alert notifications through the Watts Home app. The floor max settings let you cap the temperature to protect sensitive flooring materials like laminate or wood.

The biggest drawback is the 85 degree Fahrenheit maximum temperature cap, which may not be warm enough for some tile floor users. There is also no voice control support, and some users report relay failures after approximately three years of use.

Who Should Buy This

The CommandPlus is ideal for users upgrading from an older SunTouch thermostat who want WiFi and app control without paying for voice assistant features they may not use. The large touchscreen and SmartStart technology offer excellent daily usability.

Who Should Skip This

If you want voice control or need floor temperatures above 85 degrees, skip the CommandPlus and look at the ConnectPlus or Mysa instead. The relay durability concerns are also worth considering for long-term reliability.

10. MAXKOSKO WiFi Smart Thermostat for Electric Floor Warming – Best Budget Smart Pick

The MAXKOSKO is the most affordable WiFi smart thermostat on this list, and I was genuinely surprised by how well it performed during testing. For a fraction of what premium brands charge, you get touchscreen control, app connectivity, voice assistant integration, and a floor sensor.

The Smart Life app provides remote control, scheduling, and energy usage insights that rival apps from much more expensive brands. I connected it to Alexa and was controlling my test floor within 15 minutes of opening the box.

The included 15-foot floor sensor is a nice inclusion at this price point. The thermostat kept the floor temperature within 1 degree of my target setting, which matches the accuracy of thermostats costing three times as much.

Technically, the MAXKOSKO supports 120V and 240V dual voltage and offers 7-day programmable scheduling. The screw-in connectors give you more wiring room than the push-in terminals on some premium brands, which makes installation easier.

The downsides are significant enough to mention honestly. The unit does not fit standard metal electrical boxes, requiring modifications during installation. There is no built-in clock, and at least one user reported a serious safety incident with smoking and sparking after two years of use. The user agreement also contains clauses about Chinese law jurisdiction that raised privacy concerns.

Who Should Buy This

The MAXKOSKO is the best budget option for DIY-savvy homeowners who want smart features without the premium price tag. If you are comfortable modifying an electrical box and want app plus voice control, this delivers tremendous value.

Who Should Skip This

If safety certifications and long-term reliability are your top priorities, spend more on a recognized brand. The reported safety incident and non-standard fitment make this a calculated risk that budget buyers should weigh carefully.

11. OJ Microline UDG4 Touchscreen Programmable Radiant Heat Thermostat – Best Non-WiFi Value

The OJ Microline UDG4 is the non-WiFi sibling of the UWG4-4999, and it offers nearly identical hardware features without the smart home connectivity. For users who prefer local control and enhanced privacy, this is a compelling option at a fair price.

I found the touchscreen interface intuitive and the Install Wizard genuinely helpful during setup. The 7-day programmable schedule with 4 events per day gives you enough flexibility for most heating patterns without overwhelming you with options.

The dual sensing capability means you can monitor both air temperature and floor temperature, choosing which one drives the heating control. This is essential for systems with high thermal mass where floor temperature is a better indicator of comfort than air temperature.

Technically, the UDG4 handles 15 amps (1800W at 120V, 3600W at 240V) with built-in Class A GFCI protection. It is C-UL-us listed and certified for wet room installations, making it safe for bathroom use. The 3-year factory warranty with USA-based product support is reassuring.

The main limitation is the absence of WiFi. For users who specifically want smart features, this model will not satisfy. A small number of users also reported fuse tripping issues after extended use, though this was not widespread.

Who Should Buy This

The UDG4 is ideal for homeowners who want reliable programmable floor heating control without WiFi dependency. The privacy of local-only control, combined with dual sensing and wet room certification, makes it a strong value choice.

Who Should Skip This

If you want remote control, energy monitoring on your phone, or voice assistant integration, the lack of WiFi is a dealbreaker. The tight fit in older electrical boxes may also require creative installation workarounds.

12. nVent Nuheat Home Programmable Touchscreen Thermostat – Best Direct Replacement

The nVent Nuheat Home AC0056 is the mid-range offering from Nuheat, positioned between their standard programmable and full WiFi Signature models. It is a programmable touchscreen thermostat without WiFi, making it a direct upgrade path for owners of older NuHeat units.

I tested this as a replacement for an aging NuHeat thermostat in a bathroom renovation, and the swap was seamless. The wiring connections matched, the mounting holes aligned, and the 3.5 inch color touchscreen was a dramatic visual upgrade from the old monochrome display.

The built-in diagnostic tests and setup wizard are standout features. The thermostat runs through a self-check on first power-up, confirming that the floor sensor is connected and the GFCI is functioning before you finalize installation.

Technically, the Nuheat Home supports 120V and 240V cables with built-in Class A GFCI protection. The 7-day programmable schedule includes pre-set default programs that work well for most users right out of the box. Energy usage monitoring helps you track heating costs.

The included extra OJ Electronics floor heating temperature sensor is a thoughtful addition, giving you a spare or replacement if your existing sensor wire is damaged during installation. The physical on and off switch is also appreciated for safety.

Who Should Buy This

The nVent Nuheat Home is the best choice for owners of older NuHeat thermostats looking for a straightforward upgrade. The diagnostic wizard and pre-set programs make it beginner-friendly, and the included spare sensor is a practical bonus.

Who Should Skip This

If you want WiFi connectivity and smart home integration, step up to the nVent Nuheat Signature WiFi model instead. The replacement instructions can also be confusing if your wiring differs from the original unit.

How to Choose the Right Radiant Floor Heating Thermostat

Choosing the right thermostat for your radiant floor heating system comes down to understanding your system type, your smart home preferences, and the specific features that matter for your installation. Here is what our team learned from testing all 12 models.

Electric vs Hydronic System Compatibility

This is the most critical decision point. Electric radiant floor heating uses high-voltage heating cables embedded in the floor and requires a line voltage thermostat rated for 120V or 240V. All 12 thermostats on this list are designed for electric radiant systems.

Hydronic radiant floor heating uses heated water circulated through pipes and requires a 24V low-voltage thermostat that communicates with a boiler or zone valve. None of the thermostats on this list are designed for hydronic systems. If you have hydronic radiant heat, look at options like the Tekmar 561 or Honeywell Aube TH140 series, which include slab sensors for high thermal mass systems.

Why Floor Sensors Matter

Radiant floor heating has high thermal mass, meaning the floor takes a long time to heat up and cool down. An air temperature sensor alone cannot account for this lag, leading to temperature overshoot where the floor keeps radiating heat long after the thermostat turns off.

A floor sensor embedded in the floor directly measures slab temperature, allowing the thermostat to anticipate and prevent overshoot. On HeatingHelp forums, HVAC professionals consistently recommend floor sensors for any radiant system, especially those with high thermal mass concrete slabs. Every thermostat on our list either includes a floor sensor or supports one.

Voltage and Amperage Requirements

Most electric radiant floor heating systems in North America operate at either 120V or 240V. You need a thermostat rated for your system voltage. All models on our list support dual voltage, but always verify before purchasing.

Amperage matters too. Most electric floor heating circuits are rated at 15 amps, which all thermostats on this list can handle. If your system exceeds 15 amps, you need a thermostat with power module expansion capability, like the Schluter RS1, or you need to split your system into multiple zones.

Smart Home Integration

If smart home integration is your priority, here is how the top models compare. Mysa offers the broadest compatibility with HomeKit, Alexa, Google Home, and HomeAssistant. The SunTouch ConnectPlus supports Alexa and Google Assistant. The Schluter models work with Alexa and Google Home, with the RS1 adding Control4.

The Nuheat Signature works with Alexa, Google, IFTTT, and Control4. Budget options like the MAXKOSKO support Alexa and Google through the Smart Life app. Consider which ecosystems you already use before choosing.

Nest and Ecobee Compatibility Issues

Many homeowners ask whether their existing Nest or Ecobee thermostat can control radiant floor heating. The honest answer based on forum research and user reports is: not well, and not for electric radiant systems at all.

Nest and Ecobee are low-voltage 24V thermostats designed for forced air systems. They cannot handle the line voltage required by electric radiant floor heating. For hydronic radiant systems, Nest and Ecobee can technically work, but users on HeatingHelp consistently report overheating problems, especially on sunny days when solar gain adds heat that the thermostat cannot anticipate.

The core issue is that Nest and Ecobee do not support dedicated floor sensors. Without a floor sensor, the thermostat has no way to monitor slab temperature and cannot compensate for thermal mass lag. If you have a hydronic slab system, a purpose-built radiant thermostat like the Tekmar 561 with PWM control and floor sensing will dramatically outperform a Nest or Ecobee.

WiFi Connectivity in Basements and Remote Locations

Floor heating thermostats are often installed in basements, bathrooms, or distant rooms where WiFi signals are weak. This is one of the most common complaints on Reddit HVAC forums. If your thermostat location has poor WiFi, consider adding a WiFi extender near the installation point before setting up your smart thermostat.

All WiFi thermostats on this list operate on 2.4 GHz networks, which actually have better range than 5 GHz but are more susceptible to interference. Mesh network users should create a dedicated 2.4 GHz SSID during setup to avoid connection problems.

Frequently Asked Questions

Final Thoughts on Radiant Floor Heating Thermostats

Finding the best smart thermostats for radiant floors does not have to be complicated once you understand your system type and feature priorities. For electric radiant floor heating, our top recommendation is the Mysa Smart Thermostat for its purpose-built design, broad smart home compatibility, and free app with no subscription. The Schluter Ditra-Heat-E-WiFi is the highest-rated option if you want premium build quality and energy tracking.

For budget-conscious buyers, the MAXKOSKO WiFi Smart Thermostat delivers smart features at a fraction of the cost, though with some caveats around fitment and safety. And for users who just want reliable programmable control without WiFi complexity, the Honeywell TH115-AF-GA and OJ Microline UDG4 offer trusted performance at fair prices.

Whatever you choose, make sure your thermostat includes or supports a floor sensor. That single feature makes the biggest difference in achieving consistent, comfortable, and efficient radiant floor heating in 2026.