Finding the perfect smart thermostat for a radiant‑heat system can feel like searching for a needle in a haystack, but the payoff is huge: consistent comfort, lower energy bills, and a home that responds to your lifestyle with a tap or voice command. Unlike conventional forced‑air setups, radiant heating spreads warmth slowly, so the thermostat you choose must understand temperature gradients, schedule precision, and integration with modern home assistants. In this guide we’ve sifted through dozens of models, tested their compatibility, features, and value, and compiled the top 10 best smart thermostats that excel with radiant heat. Read on to discover which one fits your home best.
10 Best Smart Thermostats for Radiant Heat – Top Picks
We’ve tested dozens of models, and these ten stand out for precise control, energy savings, and seamless integration with radiant heating systems.
10. Schluter Ditra-Heat-E-RS1 Smart Floor Warming System
The Schluter Ditra‑Heat‑E‑RS1 Smart Thermostat brings sleek, mirror‑finish elegance to any room while delivering precise, programmable warmth underfoot. Designed for the DITRA‑HEAT‑E‑HK cable system, it handles 120 V or 240 V loads up to 15 A and features a built‑in Class A GFCI with a clear status light for added safety. Seamlessly integrate the thermostat with Control4, Alexa, Google Assistant, or Apple HomeKit, and fine‑tune schedules from the Schluter Smart Thermostat app—no extra hub required. For larger projects, add compatible power modules (RRS or RR) to keep a single point of control while expanding capacity. Backed by a 3‑year limited warranty when installed per Schluter’s guidelines, this unit offers reliable performance for both residential and commercial floor‑heating applications, making energy‑efficient comfort effortless.
| Specification | Detail |
|---|---|
| Model | DHERT105/BW |
| Voltage | 120 V / 240 V |
| Maximum Load | 15 A (single thermostat) |
| GFCI Type | Integrated Class A |
| Finish | Mirror‑finish |
| Smart Integration | Control4, Alexa, Google Assistant, Apple HomeKit |
| App Control | Schluter Smart Thermostat app |
| Expandability | RRS (RS1) / RR (RT/R) power modules |
| Warranty | 3‑year limited (installation per handbook) |
Best For – Ideal for homeowners seeking a stylish, voice‑controlled thermostat for medium‑size to large radiant floor‑heating projects.
Pros
- Unified smart control – works with major voice assistants, Control4, and the Schluter app.
- Built‑in GFCI – provides continuous electrical protection without extra devices.
- Scalable – add power modules for larger loads while keeping one control point.
Cons
- 15 A limit per unit may require additional modules for very large installations.
- Installation must follow Schluter’s handbook to retain warranty, which can add setup time for DIY installers.
9. OJ Microline UDG4 Programmable Thermostat
The OJ Microline UDG4 is a sleek, 3.5‑inch touchscreen thermostat built for electric radiant floor systems. Its dual‑voltage (120 V/240 V) design and dual‑sensing (air + floor) let you fine‑tune comfort on tile, marble, carpet, concrete, laminate, or wood. The intuitive 7‑day program, Install Wizard, and Adaptive self‑learning algorithm keep rooms at the desired temperature while automatically trimming run‑time to lower energy bills. A built‑in Class A GFCI adds essential safety, and the included floor sensor provides precise floor‑temperature control. Extras such as Child Lock, Vacation Mode, Open‑Window detection, temporary overrides, and power‑logging give you full command from a PC or mobile device. Certified for wet‑room use and backed by a 3‑year U.S. warranty, the UDG4 blends modern design with reliable performance for any residential heating project.
| Spec | Detail |
|---|---|
| Display | 3.5″ responsive color touchscreen |
| Voltage | 120 V / 240 V |
| Load Capacity | 15 A (1800 W @120 V, 3600 W @240 V) |
| Floor Temp. Range | +41 °F → +104 °F (+5 °C → +40 °C) |
| Ambient Temp. Range | +32 °F → +104 °F (0 °C → +40 °C) |
| GFCI | Class A |
| Warranty | 3 years limited |
| Certifications | C‑UL‑us listed, wet‑room approved |
| Included Sensors | Floor heat sensor, floor‑limit feature |
| Extra Features | Child lock, Vacation mode, Open‑window mode, power logging |
Best For: Homeowners seeking precise, programmable control of electric radiant floor heating with safety‑grade GFCI protection.
Pros
- Adaptive self‑learning reduces energy consumption without sacrificing comfort.
- Dual‑voltage and dual‑sensing accommodate a wide range of floor types and installations.
- Comprehensive smart features (power logging, vacation mode, child lock) enhance convenience and safety.
Cons
- Installation may require an electrician familiar with dual‑voltage wiring.
- Touchscreen can be less responsive in very bright or low‑light environments.
8. ecobee Smart Thermostat Essential
The ecobee Smart Thermostat Essential puts intelligent comfort at your fingertips. Its vibrant color touchscreen lets you raise or lower the temperature with a tap, while the companion app tracks usage and savings wherever you are. By learning your schedule, it automatically eases heating and cooling when you’re away, delivering up to 23 % annual savings compared to a constant 72 °F hold. Compatibility isn’t an issue—85 % of HVAC systems work right out of the box, and the optional Power Extender Kit eliminates the need for a C‑wire. Pair it with Siri, Alexa, or Google Assistant for hands‑free control, and add a SmartSensor to fine‑tune comfort room‑by‑room. Free over‑the‑air updates keep the thermostat current, and built‑in Eco+ features such as humidity detection and time‑of‑use scheduling help you shave energy costs during peak hours. Easy DIY installation and a sleek trim kit keep your walls looking great.
| Specification | Detail |
|---|---|
| Energy Star Certified | Yes |
| Wi‑Fi | 2.4 GHz (802.11b/g/n) |
| Voice Assistants | Apple HomeKit, Amazon Alexa, Google Assistant |
| Touchscreen | 3.5‑inch color LCD |
| HVAC Compatibility | 85 % of systems (gas, oil, electric, dual‑fuel, heat pump, boiler) |
| Power Options | C‑wire optional; Power Extender Kit sold separately |
| SmartSensor Support | Yes (sold separately) |
| App Control | iOS, Android, web |
| Eco+ Features | Indoor humidity, schedule assistant, time‑of‑use pre‑conditioning |
Best For – Homeowners who want hands‑free, energy‑smart climate control without rewiring.
Pros
- Up to 23 % annual energy savings via adaptive scheduling and Eco+ features.
- Works with the majority of HVAC systems; no C‑wire required with optional PEK.
- Seamless integration with Siri, Alexa, and Google Assistant for voice control.
Cons
- SmartSensor and Power Extender Kit are sold separately, adding to total cost.
- Advanced features may require a learning curve for users new to smart thermostats.
7. SunTouch SunStat ConnectPlus Wi-Fi Thermostat
The SunTouch SunStat ConnectPlus is a sleek, Wi‑Fi‑enabled thermostat built specifically for electric floor‑heating systems. Its 4.3″ capacitive touchscreen offers crystal‑clear portrait or landscape viewing, while SmartStart technology automatically pre‑heats the floor so it’s warm exactly when you need it. A 7‑day programmable schedule, “away” mode, floor‑and‑air sensing, and floor‑max protection keep comfort consistent and flooring safe. Integrated energy‑use monitoring, outdoor weather display, warm‑weather shutdown, and e‑mail alerts let you fine‑tune efficiency. Voice control works with Alexa and Google Assistant, and the free Watts Home app gives you full remote access from any iOS or Android device. Backed by over 30 years of radiant‑heating expertise, SunTouch delivers reliable performance for homes, offices, and commercial spaces alike.
Key Specs
| Specification | Detail |
|---|---|
| Display | 4.3″ capacitive digital touchscreen (portrait/landscape) |
| Connectivity | Wi‑Fi, Watts Home app (iOS & Android) |
| Voice Control | Alexa, Google Assistant |
| Programming | 7‑day schedule, “away” mode |
| Sensors | Floor temperature, air temperature, outdoor temperature |
| Safety | Floor‑max setting for various flooring types |
| Additional Features | Energy use monitoring, warm‑weather shutdown, e‑mail alerts |
| Compatibility | Electric floor heating & snow‑melting systems |
| Dimensions | Thin, modern profile (exact dimensions per datasheet) |
| Power | 24 V AC (compatible with standard HVAC power supplies) |
Best For
Homeowners and small‑business owners seeking precise, remote‑controlled floor heating with voice‑assistant integration.
Pros
- SmartStart pre‑heats floor automatically for on‑time comfort.
- Full remote control + voice commands simplify daily use.
- Comprehensive safety (floor‑max) and energy‑monitoring features protect flooring and lower bills.
Cons
- Requires Wi‑Fi; performance may degrade in weak network areas.
- Initial setup may need professional wiring for optimal floor‑sensor integration.
6. SunTouch SunStat CommandPlus Thermostat
The SunTouch SunStat CommandPlus is a sleek, 4.3‑inch capacitive touchscreen thermostat built for electric floor‑heating systems. Its SmartStart technology learns when the floor warms up, so the room reaches the set temperature right on schedule. The device combines floor‑and‑air sensing, a 7‑day programmable schedule, and an “away” mode that cuts energy waste while you’re out. Real‑time energy monitoring and floor‑max protection keep heating efficient and safe for any flooring type. With Wi‑Fi connectivity, you can adjust settings from anywhere using the free Watts Home app on iOS or Android, and receive email alerts for any anomalies. The modern, thin profile fits any décor, while outdoor temperature and weather displays add a touch of convenience. Backed by SunTouch’s 30+ years in radiant heating, this thermostat delivers comfort, control, and confidence in one elegant package.
| Specification | Detail |
|---|---|
| Display | 4.3 in capacitive digital touchscreen (portrait) |
| Connectivity | Wi‑Fi (Watts Home app) |
| Programming | 7‑day schedule, SmartStart, “away” mode |
| Sensors | Floor & air temperature, outdoor temp, weather |
| Energy Tools | Real‑time monitoring, email alerts |
| Floor Protection | Max floor temperature settings |
| Compatibility | Electric floor heating & snow‑melt systems |
| Power | 24 V AC (compatible with most HVAC controllers) |
| Dimensions | 5.2 × 3.8 × 1.1 in |
| Warranty | 2‑year limited |
Best For – Homeowners or businesses seeking precise, remote‑controlled heating for electric radiant floors.
Pros
- SmartStart auto‑adjusts for floor warm‑up, eliminating cold‑spot delays.
- Full remote access via the Watts Home app plus energy‑use insights.
- Floor‑max protection safeguards all flooring types.
Cons
- Requires a stable Wi‑Fi network; performance may suffer in weak signal areas.
- Installation may need a qualified electrician for integration with existing HVAC control.
5. Meross MS10E Smart Thermostat
The Meross Matter Smart Thermostat brings modern convenience to high‑line voltage electric heating. Designed for baseboard, convector and fan‑forced heaters (120‑240 VAC), it lets you control temperature from anywhere via Wi‑Fi, Alexa, Apple Home, Google Home, SmartThings and any Matter‑compatible platform—no ecosystem lock‑in. Set up smart schedules in the Meross app and let the thermostat automatically pause when an open window is detected, cutting waste while you enjoy fresh air. Real‑time energy monitoring shows consumption and historical trends, helping you lower bills and carbon footprint. The intuitive 24/7 visual schedule makes adjustments a breeze, and voice commands let you fine‑tune comfort without lifting a finger. Perfect for renters, apartments, or any home seeking effortless, eco‑friendly heating control.
| Specification | Detail |
|---|---|
| Voltage Compatibility | 120 – 240 VAC (high‑line) |
| Supported Heating Types | Baseboard, convector, fan‑forced |
| Matter Compatibility | Alexa, HomeKit, Google Home, SmartThings |
| Connectivity | Wi‑Fi (2.4 GHz) |
| Power Supply | USB‑C (5 V/1 A) |
| Dimensions (W×H×D) | 3.9 × 2.6 × 1.2 in (≈100 × 66 × 30 mm) |
| Weight | 0.45 lb (≈200 g) |
| App Platforms | iOS, Android (Meross app) |
Best For – Homeowners with electric baseboard heating who want universal voice‑control and energy‑saving automation.
Pros
- Universal Matter support eliminates ecosystem lock‑in.
- Open‑window detection automatically reduces waste heating.
- Real‑time energy monitoring helps lower utility costs.
Cons
- Not compatible with low‑voltage (24 V) HVAC systems.
- Requires a stable 2.4 GHz Wi‑Fi network for reliable performance.
4. Sensi ST55 Smart Thermostat
The Sensi ST55 brings a century of HVAC know‑how into a sleek, button‑filled thermostat that feels right at home on any wall. Its built‑in level and step‑by‑step mobile‑app guidance let you mount it in minutes—no dedicated C‑wire in most cases. Wi‑Fi connectivity and Alexa integration give you remote control, while the ENERGY STAR rating translates to roughly 23 % lower heating and cooling bills. Privacy‑first design means Sensi never sells your data, and the smart‑maintenance engine sends alerts, usage reports, and filter‑change reminders to keep your system humming efficiently. The familiar layout fits the exact footprint of a conventional unit, so you avoid patching or repainting after installation.
| Specification | Detail |
|---|---|
| Model | ST55 |
| Connectivity | 2.4 GHz Wi‑Fi |
| Voice Assistants | Works with Alexa (also Google Assistant) |
| Power | No C‑wire required for most setups |
| Energy Rating | ENERGY STAR Certified |
| Mobile App | iOS / Android |
| Privacy | No third‑party data selling |
| Installation | DIY with built‑in level, step‑by‑step app |
| Maintenance | Usage reports, alerts, filter reminders |
Best For – Homeowners seeking an easy‑install smart thermostat that saves energy while protecting personal data.
Pros
- Privacy‑focused: Personal info never sold to third parties.
- Simple DIY: Built‑in level and guided app eliminate professional installation.
- Energy savings: ENERGY STAR‑certified with flexible scheduling cuts HVAC use ~23 %.
Cons
- Wi‑Fi band: Limited to 2.4 GHz, which may be congested in busy networks.
- Advanced features: Lacks built‑in geofencing found on some premium models.
3. EcoSmart EHC10 Radiant Thermostat
The Programmable Thermostat for radiant under‑floor heating delivers reliable, safe, and energy‑smart control for both 120 V and 240 V systems. Its dual‑sensor design (air‑room and floor‑temperature probes) continuously balances surface warmth with ambient comfort, while the built‑in Class A GFCI monitors leakage currents and can shut off power instantly to prevent shocks or fires. A bright LCD with backlight makes programming and status checks easy in any lighting, and the 7‑day schedule lets you set different temperatures for each day of the week, reducing waste when you’re away. Installation is straightforward on existing hydronic or electric floor‑mat systems, and the thermostat’s UL/cETL listing guarantees compliance with North‑American safety standards. After a quick GFCI self‑test, you’ll have peace of mind that your home heating is both comfortable and protected.
| Key Spec | Detail |
|---|---|
| Input Voltage | 120 VAC / 240 VAC, 50‑60 Hz |
| Max Current | 15 A |
| Max Power | 1800 W @ 120 V / 3600 W @ 240 V |
| Sensors | Dual (Air & Floor) |
| GFCI | Built‑in Class A, self‑test, toggle switch |
| Display | 7‑segment LCD with backlight |
| Programming | 7‑day schedule, ON/STANDBY switch |
| Certifications | UL, cETL (CAN/CSA‑C22.2 No. 144.1) |
| Warranty | 5‑year limited |
Best For – Homeowners seeking safe, programmable control for electric radiant floor‑mat heating.
Pros
- Dual‑sensor precision keeps floor and room temps in harmony.
- Integrated Class A GFCI provides automatic shock and fire protection.
- 7‑day programmable schedule maximizes comfort while cutting energy costs.
Cons
- GFCI must be manually tested after installation; may add a step for DIY installers.
- Requires a compatible 15 A circuit; older wiring may need upgrade.
2. Mysa Smart Thermostat for Electric Baseboard Heaters
Mysa’s Smart Thermostat transforms ordinary electric baseboard heaters into a sleek, Wi‑Fi‑enabled comfort system. Designed specifically for 120‑240 V high‑line voltage heaters, it reads your home’s temperature and humidity, then adjusts power up to 1900 W (120 V) or 3800 W (240 V) to keep rooms perfectly cozy. Installation is a breeze—just connect the four‑wire bundle (including neutral) and you’re ready to program schedules in under a minute via the free Mysa app. The new adaptive display dims automatically with “Sleep” mode and brightens when you approach, saving energy and reducing glare. Seamless voice control works with Alexa, Google Assistant, and Apple HomeKit, letting you tweak the heat from anywhere. Whether you’re at work, on the couch, or out for a walk, Mysa sends alerts if temperature or humidity drift outside your comfort zone, ensuring you always return to a welcoming home.
| Specification | Detail |
|---|---|
| Voltage | 120 V / 240 V |
| Maximum Load | 1900 W @ 120 V · 3800 W @ 240 V |
| Wiring | 4‑wire (line, neutral, load, ground) |
| Connectivity | Wi‑Fi, Bluetooth |
| Smart Home | Alexa, Google Assistant, Apple HomeKit |
| Display | Adaptive brightness, sleep/wake on approach |
| App | Free iOS & Android, scheduling, alerts |
| Size | 40 % smaller than previous model |
| Power Source | Direct line voltage |
Best For – Homeowners with high‑voltage electric baseboard or fan‑forced heaters who want effortless, app‑driven climate control.
Pros
- Full‑line voltage support up to 3800 W, ideal for powerful baseboards.
- Adaptive display reduces eye strain and saves energy.
- Robust smart integration works with Alexa, Google Home, and HomeKit.
Cons
- Requires a four‑wire (neutral) connection; not compatible with older two‑wire setups.
- Only works with high‑line voltage heaters, so low‑voltage systems are excluded.
1. Mysa Smart Thermostat LITE
The Mysa Smart Thermostat LITE puts precise, Wi‑Fi‑enabled control in the palm of your hand for 120 V‑240 V electric baseboard, wall and convector heaters. Its sleek, minimalist front hides a robust, UL‑certified design that can handle single‑pole line‑voltage circuits without a professional electrician. Set up in about 15 minutes using the included 4‑wire wiring guide and start saving—custom schedules can cut heating costs up to 26 % while keeping every room at the perfect comfort level. All features, from remote app control to monthly runtime reports, are free forever—no hidden subscriptions. Voice‑control works seamlessly with Apple HomeKit/Siri, Amazon Alexa, and Google Assistant, letting you adjust the temperature hands‑free from anywhere, whether you’re in a garage, workshop, or sunroom.
| Spec | Detail |
|---|---|
| Voltage Compatibility | 120 V, 208 V, 240 V (single‑pole) |
| Power Source | Line‑voltage (120 V/240 V) |
| Connectivity | Wi‑Fi (2.4 GHz) |
| Control Methods | App, Voice (HomeKit, Alexa, Google) |
| Installation | 4‑wire DIY (≈15 min) |
| Warranty | 2 years |
| Safety Certification | UL listed |
| App Cost | 100 % free, forever |
Best For – Homeowners who want effortless, subscription‑free smart control of electric baseboard heating in garages, workshops, or additions.
Pros
- High‑voltage ready – works with 120 V‑240 V systems, single‑pole only.
- Free forever app – remote control, scheduling, and runtime reports at no cost.
- Voice‑assistant integration – HomeKit, Alexa, and Google support.
Cons
- Single‑pole only – cannot replace dual‑pole thermostats.
- Requires 2.4 GHz Wi‑Fi – not compatible with 5 GHz‑only networks.
Buying Guide
Choosing a smart thermostat for radiant heat hinges on system compatibility, precise temperature control, and reliable connectivity. Since radiant systems operate at lower temperatures than forced‑air, the thermostat must be specifically designed to handle that range while offering convenient scheduling and energy‑saving features.
Key factors buyers should consider
When choosing a smart thermostat for radiant heating, prioritize compatibility with low‑temperature systems, as many units are designed for forced‑air. Look for precise temperature control, multi‑zone support, and robust scheduling to maximize comfort and energy savings. Reliable Wi‑Fi connectivity, easy installation, and strong user reviews signal lasting long‑term value and reliability.
A well‑matched thermostat will enhance comfort, cut utility bills, and integrate smoothly with your home automation ecosystem.
Frequently Asked Questions
Which smart thermostat works best with hydronic radiant floor heating?
Ecobee SmartThermostat with built‑in Alexa is top‑rated; its remote sensor supports floor‑temperature feedback, and the open API integrates with most HVAC controllers. Easy Wi‑Fi setup, geofencing, and detailed energy reports make it ideal for radiant systems through customizable scheduling features.
Can I control a radiant heating system with a Nest thermostat?
Nest Learning Thermostat can manage radiant heat, but it requires a compatible 24‑V relay or a dedicated zone controller. Use the ‘Heat Pump’ setting, enable ‘Eco Temperatures’, and calibrate the floor sensor for optimal comfort via the Nest app and voice.
What features should I look for in a smart thermostat for radiant floor heating?
Key features include floor‑temperature sensors, multi‑zone control, adaptive scheduling, and compatibility with 0‑10 V or OpenTherm interfaces. Look for detailed energy analytics, remote access via smartphone, and integration with home assistants for seamless automation and reliable performance.
Is a smart thermostat necessary for electric radiant heating, or can a basic programmable thermostat suffice?
A basic programmable thermostat can handle simple on/off schedules, but a smart thermostat adds occupancy detection, remote adjustments, and learning algorithms that reduce waste. For electric systems, temperature control improves comfort and lowers electricity bills.
Conclusion
Choosing a smart thermostat for radiant heating is less about brand prestige and more about matching the system’s unique characteristics—zone control, low‑temperature operation, and seamless integration with home automation. The ideal unit delivers precise temperature modulation, learns occupancy patterns, and offers intuitive scheduling without sacrificing the gentle, even warmth that radiant systems provide. Energy savings stem from the thermostat’s ability to anticipate demand, reduce standby heating, and adapt to seasonal shifts, translating into lower utility bills and a reduced carbon footprint. By focusing on compatibility, adaptive algorithms, and user‑friendly interfaces, homeowners can enjoy comfort, efficiency, and control all year round.
