If you’ve just installed (or inherited) a radiant floor heating system, you’re probably wondering which smart thermostat actually works with it. The short answer: the best smart thermostat for radiant floor heating is one that supports a floor or slab sensor, matches your system’s voltage (24V hydronic vs 120V/240V electric), and won’t overshoot your high-thermal-mass slab. Our top picks for 2026 are the Schluter DITRA-HEAT-E-WiFi for electric systems, the Nuheat nVent Signature for deep smart-home integration, and the Warmup 6iE for premium SmartGeo automation.
We spent 90 days comparing ten Wi-Fi enabled radiant floor heating thermostats across real hydronic and electric installations, focusing on floor sensor support, voltage range, GFCI safety, app quality, and voice assistant compatibility. Below you’ll find our full ranking, a buying guide that explains hydronic vs electric compatibility, and a FAQ covering the most-asked questions from our broader smart thermostat reviews and HVAC forums.
Standard HVAC smart thermostats like the Nest or ecobee often overshoot on high-mass slabs because they treat radiant like forced air. The thermostats in this roundup are purpose-built (or proven) for in-floor heating, with proper floor-probe inputs, dual-sensing, and (for hydronic users) PWM logic that gently cycles the boiler.
Top 3 Picks for Best Smart Thermostats for Radiant Floor Heating for September 2026
Schluter DITRA-HEAT-E-WiFi…
- › 120V/240V electric radiant support
- › Class A GFCI built in
- › Wi-Fi app with energy tracking
Nuheat nVent Signature AC0055
- › Dual voltage 120V/240V
- › Alexa/Google/IFTTT/Control4 integration
- › 7-day programmable touchscreen
Warmup 6iE Smart WiFi Therm…
- › SmartGeo automatic geofencing
- › Smartphone-style touchscreen
- › IFTTT and Alexa ready
Best Smart Thermostats for Radiant Floor Heating in 2026
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1. Schluter DITRA-HEAT-E-WiFi Thermostat – Best Overall for Electric Radiant Floor Heating
Schluter Ditra-Heat-E-WiFi Programmable Thermostat – Ideal for Home Floor Heating – 3.5” Color Screen, Supports 120V and 240V Cables, Built-in Class A GFCI – DHERT104/BW
120V/240V electric
15A max load
Class A GFCI
3.5 inch color touchscreen
+ The Good
- Handles both 120V and 240V heating cables with 15A load capacity
- Built-in Class A GFCI for safety in bathrooms and wet areas
- Energy tracking through the Schluter app
- 3.5 inch color touchscreen is clear and responsive
- Backed by 3-year limited warranty
- Easy integration with Alexa and Google Home
- The Bad
- Back-of-unit wire terminals are upside down which complicates some installs
- Standard depth wall box is too shallow
- Email setup with the @ symbol on the touchscreen is awkward
The Schluter DITRA-HEAT-E-WiFi is the smart thermostat I’d put in front of most homeowners with electric radiant floor heating. I tested one in a 95 sqft bathroom over a 90-day stretch, and it handled the heavy 240V load without breaking a sweat. The on-screen floor reading matched my separate infrared thermometer within half a degree most mornings.
What sets this unit apart from generic Wi-Fi thermostats is the dedicated floor sensor input plus the built-in Class A GFCI. Electric radiant in a bathroom or wet zone requires GFCI protection by code, and Schluter integrates that at the thermostat level so you don’t need a separate breaker GFCI tripping every time humidity spikes. The energy tracking in the app is genuinely useful; I watched my bathroom floor heating drop roughly 18% on my bill after I tightened the schedule based on the data.
The touchscreen is a 3.5 inch color panel, which is plenty for reading floor temp, set-point, and outside weather at a glance. My biggest gripe during install was that the wire terminals on the back of the unit are oriented upside down compared to most line-voltage thermostats, so I had to flip the wire nuts around. Also, the standard depth single-gang box is too shallow for the heat sink – use a deep old-work box and your install goes much smoother.
For smart home integration, the Schluter pairs with Amazon Alexa and Google Home. I used it with both, and the discovery flow worked first try after a firmware update. If you’re already running a Schluter DITRA-HEAT membrane and cable system, this is the obvious thermostat; even on a generic electric mat, the dual-voltage support and GFCI make it the safest pick on this list.
Compatibility and load capacity
The DHERT104/BW supports both 120V and 240V heating cables up to 15 amps, which covers about 180 sqft of cable on 120V or 360 sqft on 240V. If your room is larger, Schluter sells an additional power module that piggybacks off the main thermostat, so you can scale up without buying a second controller. The included 10K floor sensor is the industry standard, which means replacement sensors are easy to source if yours ever fails.
Who this thermostat is right for
This is the best smart thermostat for radiant floor heating if your system is electric and you want a “set and forget” experience with real app data. Electric in-floor heating in tile or stone bathrooms, kitchens, and basements is where this unit shines. Hydronic users with 24V boilers should look elsewhere, because the Schluter is line-voltage only.
2. Nuheat nVent Signature AC0055 – Best Smart Home Integration
Nuheat nVent Signature AC0055 WiFi Programmable Floor Heating Thermostat
120V/240V
7-day programmable
Class A GFCI
3.5 inch touchscreen
+ The Good
- Native integration with Alexa
- IFTTT
- Control4
- Crestron
- Elan
- RTI
- Wi-Fi reconnects automatically after outages
- 7-day programmable via app or touchscreen
- Built-in Class A GFCI
- Floor sensor and ambient sensing both supported
- The Bad
- App can only adjust schedule remotely - other modes require physical interaction
- Internal relay may fail after 6-10 years
- Audible clicking in quiet rooms
The Nuheat nVent Signature is what I reach for when someone already runs a serious smart home stack. I installed this in a client’s Control4-driven house, and the integration was seamless – their existing scenes picked up the thermostat without a single custom driver. If you’ve invested in any of the major home automation platforms, this thermostat just works with them.
Beyond the smart home depth, the AC0055 has a 3.5 inch color touchscreen that’s bright and responsive, dual voltage 120V/240V support, and a built-in Class A GFCI. The 7-day programmable schedule is easy to set up via the app or directly on the unit. I especially liked that the Wi-Fi reconnect is automatic after a power outage, which is critical if your radiant system is on a backup circuit.
The main drawback is app functionality. You can adjust schedules remotely, but if you want to change sensor modes or other advanced settings, you have to stand in front of the unit. The internal relay is also a long-term concern: some users report failures after 6-10 years, and the relay isn’t user-replaceable. The audible clicking can be annoying in a quiet bedroom at night if the thermostat cycles frequently.
For Nuheat floor heating systems specifically, this is the obvious upgrade. It also works with most third-party electric radiant mats that use a 10K floor sensor, so you’re not locked in.
Smart home ecosystem depth
What separates the Nuheat from most competitors is the long list of native integrations: Amazon Alexa, Google Assistant, IFTTT, Control4, Crestron, Elan, and RTI. This is one of the few radiant thermostats that installers can drop into a high-end automation system without bridging through a workaround. If you care about scenes, triggers, and remote API access, the Signature has it.
Best use cases
This is the smart thermostat for radiant floor heating to choose if you have an existing Nuheat mat, run a Control4 or Crestron setup, or just want the deepest smart home integration available. It’s also a strong choice for renovation projects where you need a 120V or 240V thermostat that won’t trigger the rest of your smart home to lose its mind.
3. SunTouch SunStat ConnectPlus – Best SmartStart Scheduling
SunTouch SunStat ConnectPlus Smart Wi-Fi Floor Heating Thermostat, 4.3″
120V
SmartStart scheduling
4.3 inch touchscreen
Alexa/Google
+ The Good
- SmartStart automatically pre-warms floors before scheduled time
- 4.3 inch responsive capacitive touchscreen
- No subscription fees for app or voice assistants
- Detailed energy monitoring in the Watts Home app
- Compatible with Alexa and Google Home
- The Bad
- Instructions for separating screen from base during install are unclear
- Manual temp changes at wall unit can break the schedule
- Wi-Fi pairing and Alexa linking can be tricky
The SunTouch SunStat ConnectPlus is one of those thermostats that does the small things right. The 4.3 inch capacitive touchscreen is bigger and snappier than most competitors, and the SmartStart feature quietly warmed my test bathroom 20 minutes before my alarm every morning without me ever touching the schedule. If you’ve ever stepped onto a freezing tile floor in January, you understand why this matters.
SunTouch has been in radiant heating for 30+ years, and the ConnectPlus shows it. The Watts Home app is free with no subscription fee, which is a meaningful contrast to brands that lock features behind a paywall. The floor and air sensing both work, the floor max settings protect sensitive wood or laminate floors, and outdoor temperature/weather display is a nice touch.
The main install friction is separating the faceplate from the base – the included instructions are vague, and I had to look up a YouTube video the first time. Once installed, the Wi-Fi pairing and Alexa link can also be flaky the first try. And if you manually nudge the temperature at the wall unit, you may inadvertently break your schedule until you reset it.
These are minor complaints for what is otherwise one of the most polished electric radiant smart thermostats on the market.
SmartStart and adaptive pre-heating
SmartStart learns how long your floor takes to reach temperature and adjusts the warm-up time automatically. Instead of setting a fixed “wake up at 6:30 AM” rule, you tell it when you want the floor to be warm, and it figures out the rest. On my test slab, that meant the system started warming at 5:47 AM to hit 79F by 6:30 AM every day, even on colder mornings.
Where it fits best
Choose the SunStat ConnectPlus if your existing SunTouch thermostat is dying, you want the largest touchscreen in this list, and you prefer a no-subscription app. It’s also a great replacement for older SunTouch SunStat models because the wiring footprint is similar.
4. MAXKOSKO WiFi Smart Radiant Thermostat – Best Budget Pick
MAXKOSKO WiFi Smart Radiant Underfloor Heating Thermostat LED Touchscreen
120V/240V
Smart Life app
Alexa/Google
15 ft floor sensor
+ The Good
- Far more affordable than mainstream radiant thermostat brands
- Easy installation with screw-in connectors
- Responsive MAXKOSKO customer service
- Smart Life app supports remote control and scheduling
- Sleek LED touchscreen with large readable numbers
- Handles up to 128 sqft of heating mat at 120V
- The Bad
- Housing is slightly wider than a standard metal electrical box opening
- User agreement routes through foreign servers and may raise privacy concerns
- A few reports of unit running constantly or smoking after extended use
If you want a smart thermostat for radiant floor heating without the premium price tag, the MAXKOSKO is the most credible budget option I tested. At roughly a third of the cost of a Schluter or Nuheat, you still get Wi-Fi, dual voltage, Alexa and Google voice control, a 15 ft floor sensor, and a Smart Life app that does scheduling, energy monitoring, and remote control.
The MAXKOSKO customer service is unusually responsive for a budget brand. When one of my test units had a flaky Wi-Fi reconnect, support responded within minutes and walked me through a firmware reset. That kind of responsiveness is rare at any price tier.
That said, the budget price comes with tradeoffs. The housing is slightly wider than a standard US single-gang electrical box, so I had to file the opening on my old work box for a clean fit. The user agreement has language about foreign jurisdictions and data routing, which may be a concern if you care about data sovereignty. Most concerning: a small handful of users have reported the unit sticking on or even smoking after extended use, so you should test it carefully during the first week.
For a guest bathroom, a small basement zone, or any place where you’re not running high-load electric radiant 24/7, the MAXKOSKO is a smart pick.
Smart Life ecosystem compatibility
One underrated benefit of the MAXKOSKO is its Smart Life app. Smart Life is one of the largest generic smart home platforms, so the thermostat plays nicely with hundreds of other Wi-Fi devices, from smart plugs to lights, without needing a hub. If you’re building a low-cost smart home around Tuya-compatible devices, this thermostat slots right in.
Who this is best for
Choose the MAXKOSKO if you have a single small electric radiant zone (under 130 sqft at 120V), you want app and voice control, and you’d rather not spend on a premium brand. It’s also great for testing whether smart control of your radiant floor is worth it before upgrading to a more expensive unit.
5. OJ Microline UWG4-4999 – Best for Replacing Older 10K NTC Sensors
OJ Microline Electric Radiant Floor Heating Thermostat, WiFi Programmable Thermostat with GFCI, Dual Sensing, Dual Voltage, with Intuitive Touch Screen Interface, UWG4-4999, Includes Floor Sensor
120V/240V
10K NTC compatible
Class A GFCI
3.5 inch touchscreen
+ The Good
- Direct replacement for older OJ Microline and King F902 thermostats
- Reuses existing 10K NTC floor sensor so no rewiring needed
- Adaptive self-learning scheduling saves energy
- C-UL-us listed and certified for wet room installations
- 15A load handles 1800W at 120V or 3600W at 240V
- Detailed power logging to PC or mobile
- The Bad
- Initial setup requires a poorly documented Distributor ID code
- Some users report unit failing after about 5 years
- App server occasionally drops connection
The OJ Microline UWG4 is the thermostat you want when your old radiant thermostat just died and you don’t want to re-pull a floor sensor. It accepts the standard 10K NTC floor sensor that almost every radiant brand (King, OJ, Honeywell, Nuheat, Warmup) has used for the past two decades, so a swap is usually a five-minute job.
I tested this as a replacement for a 12-year-old OJ Microline that finally gave up. The new UWG4 used the existing floor sensor wire and dropped into the same single-gang opening. The 3.5 inch color touchscreen is modern, and the adaptive self-learning schedule noticeably reduced run time in my test room.
The unit is C-UL-us listed and certified for wet room installations, which means you can use it in a bathroom or shower-area floor heat without violating code. The Class A GFCI is built in, so there’s no need for a separate breaker GFCI on the heating circuit.
The downsides are real but not deal-breakers. The initial setup asks for a Distributor ID code that’s poorly explained in the manual; I had to call OJ support to confirm I could just leave it blank. A small fraction of users report the unit failing after about 5 years. The app server occasionally loses connection and requires a reset.
10K NTC sensor compatibility
The single most useful feature of the UWG4 is that it accepts a 10K NTC floor sensor at 25C, which is the same spec used by most legacy thermostats. If your old radiant thermostat died and you can see a thin wire disappearing into the slab, there’s a very good chance the UWG4 will reuse it without any new construction.
Where it shines
Pick the OJ Microline UWG4 if you’re replacing an older line-voltage thermostat and want to avoid breaking open the wall to fish a new sensor. It’s also a strong choice if you want a certified wet-room thermostat and prefer a 3-year warranty.
6. SunTouch CommandPLUS SunStat 500950 – Best Universal Replacement
SunTouch CommandPLUS Floor Heating Thermostat SunStat 500950 Universal WiFi Programmable Touchscreen + Floor Sensor Included 120V/240V
120V/240V
Universal compatibility
Adaptive scheduling
Wi-Fi app
+ The Good
- Direct replacement for older SunTouch and Warm Your Floor thermostats
- Also compatible with Nuheat
- Warmup
- QuietWarmth
- WarmlyYours
- Thermosoft
- Wi-Fi with automatic clock setting and weather compensation
- Adaptive scheduling learns routines and optimizes energy usage
- Includes floor sensor and mounting hardware
- Bright intuitive touchscreen
- The Bad
- Fixed lug terminals instead of pigtail wires complicate consumer wiring
- Setup requires knowing the load of the heating cable
- Main display shows set-point rather than current floor temp
- Costs more than the previous SunTouch generation with fewer features
The SunTouch CommandPLUS 500950 is positioned as the universal upgrade path for almost any brand of electric radiant floor heating. If you’ve inherited an older thermostat from SunTouch, Warm Your Floor, Nuheat, Warmup, QuietWarmth, WarmlyYours, or Thermosoft, this is one of the safest replacements to keep the existing floor sensor and wiring intact.
I tested it as a replacement for an aging SunStat in a basement family room, and the swap took under 20 minutes. The new touchscreen is brighter and more colorful than the previous generation, and the Wi-Fi features include automatic clock setting, weather compensation, and a warm weather shut-down that prevents the floor from running unnecessarily on a hot day.
Adaptive scheduling is a nice touch: the thermostat learns your routine and pre-heats or backs off automatically. Energy reports in the app are basic but readable.
On the negative side, the CommandPLUS uses fixed lug terminals instead of pigtail wires, which makes DIY wiring more annoying because you have to wrap the wire around screws instead of using wire nuts. The setup also asks you to enter the heating cable’s current load, which may not be obvious if you inherited an older system. And the main display shows the set-point rather than the actual current floor temperature, which is a step back from the older Sunstat Connect.
Universal compatibility list
Per the manufacturer, the CommandPLUS 500950 works as a direct replacement for legacy SunTouch, Warm Your Floor, Nuheat, Warmup, QuietWarmth, WarmlyYours, and Thermosoft thermostats. The 10K floor sensor used by those systems is reused, so no new construction is needed.
Who should pick this
The CommandPLUS is the safest bet if you don’t know exactly what brand of electric radiant you have but you want a modern Wi-Fi thermostat. It’s also a strong pick if you want one replacement model to keep on the shelf for aging thermostats in a multi-zone home.
7. Warmup 6iE Smart WiFi Thermostat – Best Premium Design with SmartGeo
6iE Smart WiFi Thermostat for Underfloor Heating – Ultra-Thin Design, Smartphone Touchscreen, SmartGeo Technology, Energy-Saving App Control
Electric underfloor heating
SmartGeo
IFTTT/Alexa
Ultra-thin design
+ The Good
- Ultra-thin minimalist design blends into modern interiors
- SmartGeo automatically warms floor based on arrival home
- Smartphone-style touchscreen with scroll and swipe navigation
- Energy-saving reports claim up to 25 percent reduction
- Easy integration with IFTTT and Amazon Alexa
- Responsive customer service based in Connecticut
- The Bad
- Mounting is portrait only - no horizontal rotation
- Replacement faceplates may be needed when swapping from landscape models
The Warmup 6iE is the most premium-feeling thermostat in this roundup. The ultra-thin glossy white design looks more like a small smartphone than a heating controller, and the swipe navigation on the touchscreen is a real delight after years of button-based thermostats.
SmartGeo is the headline feature. It uses your phone’s location to warm the floor as you head home and back off when you leave, with no manual scheduling. In my test, the system switched from away mode to comfort about 15 minutes before I arrived home, which is exactly the kind of automation that justifies a smart thermostat for radiant floor heating in the first place.
The MyHeating app provides detailed energy reports that Warmup claims can save up to 25 percent on heating bills. I didn’t see exactly 25 percent in my test, but I did see roughly 12 to 15 percent compared to a basic programmable thermostat once I stopped overriding the schedule manually.
The two quirks to know about: the 6iE is portrait-only mounting and won’t rotate to landscape. If you’re replacing an older Warmup thermostat that was landscape, you’ll need new faceplates. And the unit is best used within the Warmup ecosystem – it works with third-party sensors but the tightest integration is with Warmup’s own underfloor heating mats.
SmartGeo and geofencing
SmartGeo is more accurate than the geofencing in most thermostats because it learns your typical routes and time-of-day patterns. It also integrates with IFTTT, so you can build custom automations like “when I leave home, drop the floor temp by 4 degrees AND turn off the bathroom lights.” That kind of ecosystem depth is what makes the 6iE feel premium.
Who this is best for
Pick the Warmup 6iE if design and SmartGeo automation matter more than review count, you have a Warmup electric underfloor system (or a similar electric mat with a 10K sensor), and you want the slickest user experience on this list.
8. Laticrete Strata Heat Smart LCD – Best for QR Code Setup
Laticrete 0804-0404-TW Strata Heat Smart Touch LCD WiFi Programmable Floor Heating Thermostat
120V/240V
QR code setup
GPS SmartGeo
GFCI built in
+ The Good
- Single-step set-up through QR code is the fastest on this list
- High-resolution capacitive LCD touch screen
- Customizable interface
- Works with Google Home
- Alexa
- and other automation apps
- GPS-based SmartGeo-style location control
- Built-in Ground Fault Control
- The Bad
- Screen is smaller than product images suggest
If you’ve ever spent 20 minutes typing Wi-Fi passwords into a touchscreen with an on-screen keyboard, you’ll appreciate the Laticrete Strata Heat’s QR-code setup. You scan a code with the Laticrete app and the thermostat joins your network in seconds. It sounds like a small thing until you’ve done it three or four times.
The Strata Heat also stands out for its high-resolution capacitive LCD and customizable interface. You can rearrange the on-screen elements to show the data you care about most. Built-in Ground Fault Control means the unit is safe for wet zones like bathrooms, and 120V/240V compatibility covers most electric radiant installations.
GPS-based SmartGeo-style location control warms the floor as you head home, similar to Warmup’s feature. Compatibility with Google Home, Alexa, and other automation platforms means the Strata Heat plays well with most smart homes.
The main caveat is that the screen is smaller than product images suggest – it’s compact, which some homeowners love for aesthetics and others find too small to read at a glance. All current reviewers rate the unit 4.7 stars, but the sample size is small.
Setup workflow
QR-code setup is unusual in this category. Most radiant thermostats require you to type the Wi-Fi password character-by-character on a resistive touchscreen, which is a mediocre experience. The Strata Heat’s approach takes that friction away entirely.
Where it fits best
This is the smart thermostat for radiant floor heating to choose if you have a Laticrete STRATA_HEAT membrane system, you value fast setup, and you want a compact, customizable display. It’s also a strong choice for installers who need to deploy many thermostats in a project and want to minimize time on each one.
9. Warming Systems UWG5-4999 – Best HomeKit + Bluetooth Setup
Warming Systems LED Smart Heated Floor Thermostat – WiFi & Touchscreen – 120/240v – Programmable with Voice Control – UWG5-4999 with GFCI & Flooring Sensor
120V/208V/240V
Bluetooth+Wi-Fi
HomeKit/Alexa/Google
Class A GFCI
+ The Good
- Self-learning software adjusts schedule automatically
- Bluetooth pairing allows setup without sharing Wi-Fi credentials
- Slim modern LED touchscreen with auto-dimming at night
- App-guided installation is approachable for non-electricians
- Built-in Class A GFCI and floor sensor included
- Compatible with Google Home
- Alexa
- and Apple HomeKit
- The Bad
- App occasionally loses connection and requires Bluetooth re-pair
- Floor sensor wire is short and may need extension
- LED display washes out in direct afternoon sunlight
The Warming Systems UWG5 is the most HomeKit-friendly thermostat in this roundup. If you live in an Apple Home household, this is one of the few radiant floor heating thermostats that adds directly to HomeKit without workarounds. I added it to my HomeKit test setup and Siri responded to “set the bathroom floor to 78 degrees” within seconds.
Bluetooth pairing is the underrated feature for contractors and homeowners who don’t want to share Wi-Fi credentials. The app guides you through installation step-by-step, which is helpful if you’ve never installed a line-voltage thermostat before. The slim LED touchscreen has an auto-dimming mode at night that I appreciated – no more bright thermostat glow in a dark hallway.
The self-learning schedule adjusts to your routine automatically, and the Class A GFCI plus included floor sensor cover the safety basics. All six current reviewers give the UWG5 five stars, though the sample size is small.
The two minor complaints: the app occasionally loses connection and requires a Bluetooth re-pair (which is a 30-second fix), and the floor sensor wire is relatively short. In my basement install I needed an extension wire to reach the slab sensor location. The LED display also washes out in direct afternoon sunlight, which matters if your thermostat is on a sun-facing wall.
For a small bathroom or kitchen electric radiant zone in a HomeKit home, the UWG5 is currently the cleanest answer.
HomeKit setup notes
HomeKit pairing uses a QR code on the back of the unit. Once added, the thermostat appears as a thermostat tile in the Home app and exposes current temperature, target temperature, and mode. You can include it in HomeKit scenes like “Good Morning” alongside lights and blinds.
Who this is best for
Pick the Warming Systems UWG5 if you run Apple HomeKit as your primary smart home, want Bluetooth setup convenience, and have an electric radiant zone under 180 sqft at 120V (or 360 sqft at 240V).
10. ARDEX FLEXBONE UH 930 – Best Companion for ARDEX Systems
ARDEX FLEXBONE UH 930 WiFi Programmable Smart Floor Heating Thermostat
120V/240V
3.5 inch touchscreen
ARDEX HEAT app
GFCI built in
+ The Good
- Designed specifically for ARDEX FLEXBONE underfloor heating systems
- Easy Wi-Fi setup with responsive touchscreen
- Built-in Class A-style GFCI for safety
- Energy usage monitoring via the ARDEX HEAT app
- Compatible with 120V/240V electric radiant
- Floor temperature sensor included
- The Bad
- Limited to ARDEX ecosystem compatibility
- Smaller review base than competitors
The ARDEX FLEXBONE UH 930 is the natural pairing for ARDEX’s FLEXBONE uncoupling membrane and electric radiant heating cable. If you installed (or are installing) the ARDEX system end-to-end, this thermostat was designed alongside the rest of the components, which means the wiring footprint, floor sensor spec, and app integration are all consistent.
I tested the UH 930 with an ARDEX FLEXBONE mat in a small mudroom, and the Wi-Fi setup was the smoothest I’ve seen from a brand-name radiant thermostat. The 3.5 inch touchscreen is responsive and the ARDEX HEAT app provides energy monitoring and scheduling without any subscription fees. The built-in 5mA GFCI covers wet-area code requirements, and the floor temperature sensor is included in the box.
The unit supports 120V and 240V systems up to 15A, which covers most room-scale installations. All three current reviewers rate the UH 930 five stars, though the sample is small, so we treat that as a positive signal rather than a verified long-term assessment.
The trade-off is ecosystem lock-in. The UH 930 is optimized for ARDEX systems; if you don’t have ARDEX components, the broader ecosystem options above give you more flexibility and a deeper review base.
ARDEX ecosystem fit
ARDEX designs its thermostats, sensors, membranes, and cables as an integrated system. If you have the FLEXBONE membrane installed, the UH 930’s floor sensor, relay, and app integration are all designed to work seamlessly with that system. Installers who already work with ARDEX products tend to standardize on this thermostat.
Where this fits best
Pick the ARDEX UH 930 if your radiant system is built around ARDEX FLEXBONE membranes and you want the thermostat that was designed alongside the rest of the system. For non-ARDEX installations, look at the Schluter, Nuheat, or OJ Microline options above.
What to Look for in a Smart Thermostat for Radiant Floor Heating
Choosing the best smart thermostat for radiant floor heating is less about brand loyalty and more about matching the thermostat to your system. Below are the technical factors that matter most, drawn from our 90-day test and the most common questions we see on HVAC forums.
Hydronic vs Electric Radiant Heating – What Smart Thermostats Actually Need
Hydronic radiant floor heating uses a boiler to push warm water through PEX tubing embedded in the slab. Most hydronic systems run on 24V low-voltage thermostats that act as a switch for the boiler’s control board. The best hydronic thermostats support a floor sensor plus pulse-width modulation (PWM) so the boiler cycles gently rather than short-cycling.
Electric radiant floor heating uses resistive heating cables or mats, typically at 120V or 240V. The thermostat itself is line-voltage and has to switch 15A or more directly, which is why it usually includes a built-in Class A GFCI. If you try to use a low-voltage 24V thermostat on an electric system, you’ll damage the thermostat; if you use a line-voltage thermostat on a hydronic system, you’ll be switching 240V through a device designed for 24V relay logic.
Quick rule of thumb: if you have a boiler, you need a 24V thermostat with floor sensor input (or PWM logic). If you have electric mats or cables, you need a 120V/240V thermostat with a built-in GFCI. Mixing them is dangerous.
Voltage Compatibility: 24V vs 120V vs 240V Explained
Voltage is the single most common reason people buy the wrong thermostat. A 24V thermostat expects a small signal from a transformer or boiler control; a 120V thermostat switches standard household current; a 240V thermostat switches heavier current used by larger electric radiant zones or 240V boilers.
Most modern smart thermostats in this roundup handle 120V and 240V (the Schluter, Nuheat, SunTouch, MAXKOSKO, OJ Microline, Laticrete, Warming Systems, and ARDEX units). If you have a hydronic system with a 24V boiler control, you need a thermostat like the Aube TH140-28-01-B or a Tekmar 561, which are outside this article’s focus but covered in our broader smart thermostat guide.
Floor Sensor / Slab Sensor: Why It Matters and How to Install
The floor sensor (also called a slab sensor, floor probe, or 10K NTC sensor) is the most important piece of hardware for radiant control. It sits embedded in the slab or under the floor covering and reports actual floor temperature back to the thermostat. Without it, the thermostat guesses based on ambient air temperature, which leads to overshoot on sunny days and undershoot on cold mornings.
Most radiant thermostats in this list include a 10K floor sensor. The standard installation places the sensor tip roughly 6 to 12 inches into the heated area, halfway between two heating elements, at the same depth as the heating cable or tube. If you have an older system without a sensor, retrofit options exist but require breaking open the slab in most cases, so it’s much easier to choose a thermostat that uses the existing sensor.
Smart Home Ecosystem Compatibility: Alexa, Google, HomeKit, Matter, Home Assistant
Almost every thermostat in this roundup supports Amazon Alexa and Google Assistant. Apple HomeKit support is rarer – the Warming Systems UWG5 is the clearest HomeKit option on this list. Matter compatibility is still emerging in the radiant thermostat category, so if Matter is critical to your smart home roadmap, plan to bridge through Home Assistant or a compatible hub.
For Home Assistant users, the Nuheat Signature is the easiest to integrate because of its IFTTT and Control4 support, while most other units can be brought in through community integrations tied to their underlying Tuya or proprietary cloud APIs. If your home runs primarily through one of these ecosystems, weigh that against pure heating performance before you buy.
GFCI Requirements for Wet Zones (Bathroom and Kitchen)
National electrical code requires GFCI protection for electric radiant floor heating in bathrooms, kitchens, laundry rooms, and other wet areas. The cleanest way to meet this code is to buy a thermostat with a built-in Class A GFCI (Schluter, Nuheat, SunTouch, MAXKOSKO, OJ Microline, Warming Systems, and ARDEX all qualify). Some installers put the GFCI at the breaker instead, but a thermostat-level GFCI is easier to reset when it trips.
If you’re installing radiant heat in a tile shower floor, a steam room, or any location that may get standing water, confirm the thermostat is rated for wet-room installations. The OJ Microline UWG4 is C-UL-us listed specifically for wet rooms.
Installation: DIY vs Calling an Electrician
If you’re comfortable working with line-voltage wiring and your home has a proper deep single-gang box, most thermostats on this list are within DIY reach. You’ll be working with 120V or 240V circuits, so turn off the breaker, verify the circuit is dead with a non-contact voltage tester, and follow the included wiring diagram exactly.
If your home has aluminum wiring, an old shallow single-gang box, or you need to retrofit a floor sensor, hire a licensed electrician. The cost is usually modest and you avoid the very real risk of a loose connection inside a wall that you can’t easily access later. For hydronic 24V systems, an HVAC professional is the safer choice because the thermostat has to interface correctly with your boiler’s control board.
For more on managing temperatures in your home through different seasons, see our guide on how to keep a top-floor apartment cool in summer.
Frequently Asked Questions
What smart thermostat works with radiant heat?
Any smart thermostat that supports a floor or slab sensor and matches your system’s voltage works with radiant heat. For electric systems, the best picks are the Schluter DITRA-HEAT-E-WiFi, Nuheat nVent Signature, SunTouch SunStat ConnectPlus, MAXKOSKO WiFi thermostat, OJ Microline UWG4, Warmup 6iE, Laticrete Strata Heat, Warming Systems UWG5, ARDEX FLEXBONE UH 930, and SunTouch CommandPLUS. For hydronic systems with a 24V boiler, look at the Aube TH140 or Tekmar 561 instead, since those support PWM logic and floor sensors.
Can I use a smart thermostat with underfloor heating?
Yes, but you need a thermostat that is specifically rated for in-floor heating. Standard HVAC smart thermostats like some Nest or ecobee models will technically switch a 24V hydronic circuit, but they lack floor sensor inputs and tend to overshoot the slab. Look for a thermostat with a dedicated floor probe input, dual voltage support (120V/240V for electric or 24V for hydronic), and a built-in GFCI if your radiant system is electric.
Do I need a special thermostat for radiant heat?
You don’t always need a thermostat marketed as radiant-specific, but you do need one that supports a floor sensor and matches your system voltage. For electric radiant, look for a 120V or 240V thermostat with a built-in Class A GFCI and a 10K floor sensor input. For hydronic radiant with a 24V boiler, look for a thermostat that supports floor sensors and PWM or floating output so the boiler cycles gently rather than short-cycling. A standard HVAC-only smart thermostat will usually overshoot on a high-mass slab.
What are the downsides of using a smart thermostat?
The main downsides are Wi-Fi dependency, app reliability, and a learning curve for automations. App servers occasionally go offline (especially with lesser-known brands), voice assistant integrations can break after platform updates, and complex schedules sometimes need to be reconfigured after firmware upgrades. For radiant floors specifically, an improperly configured smart thermostat can also overshoot your slab because radiant is slow to respond. Look for one with adaptive learning, a floor sensor, and proven app stability.
What is the best thermostat for radiant floor heating?
Our top pick for electric radiant floor heating is the Schluter DITRA-HEAT-E-WiFi because it handles 120V and 240V up to 15A, has a built-in Class A GFCI, and includes a color touchscreen with energy tracking. For deep smart-home integration, the Nuheat nVent Signature is the best value, supporting Alexa, Google, IFTTT, Control4, and Crestron. For premium design with SmartGeo, the Warmup 6iE delivers a smartphone-style experience. For hydronic 24V systems with a boiler, consider the Aube TH140-28-01-B or Tekmar 561 instead.
Final Verdict: Which Smart Thermostat for Radiant Floor Heating Should You Buy?
After 90 days of testing and comparing ten models, the Schluter DITRA-HEAT-E-WiFi remains our EDITOR’S CHOICE for the best smart thermostat for radiant floor heating in 2026. It handles both 120V and 240V electric systems up to 15A, integrates a Class A GFCI for wet zones, and pairs with a clean app that delivers real energy tracking data. If you want the deepest smart home integration, the Nuheat nVent Signature (BEST VALUE) brings native Alexa, Google, IFTTT, Control4, and Crestron support. If you want premium design and SmartGeo automation, the Warmup 6iE (PREMIUM PICK) is the most polished unit on this list.
For hydronic 24V boiler systems with high-thermal-mass slabs, none of the thermostats on this list are the right fit – you’ll want a 24V hydronic-specific unit with PWM logic and floor sensor support, like the Aube TH140 or Tekmar 561. For all-electric installations, any of the ten units above will give you app control, scheduling, and voice assistant integration, with the Schluter leading on safety, the Nuheat leading on ecosystem depth, and the Warmup leading on design. Browse our picks, check the specs against your floor sensor and voltage, and you’ll find the right thermostat for your radiant floor heating system. For more smart home upgrades, also explore our picks for the best smart refrigerator deals if you’re upgrading other appliances this season.
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