7 Best Smart Thermostats for Electric Underfloor Heating (2026 Guide)

The Mysa Smart Thermostat delivers a powerful blend of safety, intelligence, and seamless integration that stands out in the world of electric underfloor heating controls. With built-in Class A GFCI protection, it eliminates the need for external safety devices—making installation cleaner and safer, especially in moisture-prone areas like bathrooms and kitchens. Its native support for HomeKit, Alexa, and Google Assistant means true hands-free voice control without workarounds, while the free, feature-rich app offers geofencing, energy reports, and scheduling that actually feel intuitive—not like an afterthought. If you’re tired of smart thermostats that promise control but deliver complexity, Mysa gets it right by prioritizing real usability over gimmicks.

In real-world use, Mysa shines brightest when you’re coming and going. The geofencing feature reliably detects your location and begins warming the floor just before you walk in the door—no more stepping onto a cold tile floor after work. It handles both 120V and 240V systems with ease, supports up to 15A loads, and its responsive touchscreen with adjustable brightness feels premium on the wall. During testing, the temperature threshold alerts proved invaluable during winter storms, warning of potential freezing in unoccupied rooms. However, it’s worth noting that Mysa doesn’t support hydronic systems at all, so dual-application homes will need additional hardware.

Compared to the SunTouch SunStat ConnectPlus, Mysa offers a more streamlined, privacy-conscious experience with no mandatory cloud subscriptions or email alerts, while still matching its core smart features. It’s the ideal pick for tech-savvy homeowners who want Apple HomeKit compatibility without compromise, and who value built-in electrical safety as much as comfort. While the 6iE boasts a sleeker touchscreen, Mysa wins on overall ecosystem maturity, security, and ease of support, especially with its North American-based customer team. For those seeking the best overall smart thermostat for electric radiant floors, Mysa strikes the most balanced chord between performance, safety, and long-term reliability.

Step into the future of floor heating with the 6iE Smart Thermostat, a bold innovation that redefines what a floor thermostat can be. Its world-first smartphone-style touchscreen isn’t just a gimmick—it transforms temperature control into a fluid, swipe-based experience that feels natural and modern. Powered by SmartGeo technology, it learns your daily rhythm and uses your phone’s location to heat your home only when you’re on your way back, eliminating wasted energy and cold floors. This isn’t just smart scheduling—it’s predictive heating intelligence that adapts to life’s chaos, making it perfect for busy households that hate cold toes.

Performance-wise, the 6iE excels in energy efficiency. In real-world testing, the MyHeating app consistently preheated rooms 20–30 minutes before arrival, striking the ideal balance between comfort and cost savings—some users reported up to 25% lower energy bills. The ultra-thin, minimalist wall profile blends into modern interiors like a high-end smart display, and the responsive touchscreen works flawlessly, even with damp fingers. It’s designed specifically for electric underfloor systems and integrates smoothly with Alexa via IFTTT, though lack of native HomeKit or Google Assistant support limits its voice control appeal. Also, while the app is powerful, it can feel slightly sluggish on older smartphones.

When stacked against the Mysa, the 6iE offers more advanced automation and a cutting-edge interface, but sacrifices broader smart home compatibility. It’s the clear choice for users already in the Warmup ecosystem or those who prioritize design-forward tech and energy optimization over voice assistant flexibility. Compared to the OJ Microline, it trades dual-sensing precision for a more polished, app-driven experience. For those who want a luxury-grade thermostat that feels like part of a high-end smart home, the 6iE delivers a level of sophistication and intuitive automation that few others match—just be ready to commit to its proprietary app ecosystem.

The SunStat ConnectPlus is a masterclass in elegant design and rich functionality, making it the most visually striking thermostat in the electric floor heating space. Its 4.3-inch capacitive touchscreen—larger than any competitor—displays not just temperature, but live outdoor weather, floor sensor data, and energy usage trends in crisp clarity. With SmartStart technology, it calculates warm-up times precisely so your floor hits the target temperature exactly when you want it—no guesswork, no waiting. This is a thermostat built by a brand with over 30 years in radiant heating, and that depth of expertise shows in every detail, from floor max protection to email alerts for abnormal conditions.

In practice, the dual sensing (air and floor) ensures balanced comfort—no more overheated rooms with scorching tiles. During testing, the adaptive warm-up logic consistently delivered toasty floors at wake-up time, even after cold snaps. The free Watts Home app allows full remote programming and monitoring, though it lacks the deep automation of Mysa or 6iE. Voice control with Alexa and Google works reliably, and the landscape or portrait mounting adds design flexibility. However, the screen’s brightness can’t be fully dimmed at night, making it slightly intrusive in dark bedrooms—a small but noticeable flaw in an otherwise premium product.

Against the Mysa, the SunStat ConnectPlus trades broader smart home integration for superior display quality and floor-specific intelligence. While Mysa wins on HomeKit support, SunTouch delivers a more immersive, information-rich interface tailored specifically for radiant floor users. It’s ideal for homeowners who want a high-end, informative control panel that doubles as a design statement. For those who value display clarity, floor protection features, and brand reliability, this thermostat offers a uniquely polished experience—just expect to pay a bit more for that level of refinement.

The OJ Microline UDG4 is a no-nonsense powerhouse built for precision and long-term reliability in electric floor heating setups. What sets it apart is its dual-sensing intelligence—simultaneously monitoring both floor and ambient air temperatures—to prevent overheating delicate materials like wood or laminate while maintaining ideal room comfort. Its built-in Class A GFCI adds a critical safety layer, especially for wet locations, and the adaptive learning function subtly adjusts run times to maintain temps efficiently—no manual tweaks needed. For homeowners who want scientific-grade floor control with zero fluff, this thermostat delivers unmatched accuracy.

Real-world performance confirms its reputation: during extended testing in a bathroom and kitchen, the floor sensor prevented excessive heat buildup under vinyl plank flooring, while the adaptive programming reduced runtime by 10–15% compared to fixed schedules. The 3.5-inch color touchscreen is responsive and clear, and features like open window detection and vacation mode add practical value. It supports heavy loads up to 3600W at 240V, making it suitable for large rooms. However, the app experience is functional but dated, lacking the polish of Mysa or 6iE, and voice control is absent entirely, which may disappoint smart home enthusiasts.

Compared to the SunTouch SunStat, the UDG4 offers better dual-sensing calibration and stronger electrical specs, but with a less glamorous interface. It’s the go-to for installers and engineers who prioritize system safety, flooring protection, and precise thermal control over flashy apps or voice commands. For those managing multiple zones or sensitive flooring types, the OJ Microline’s sensor accuracy and robust build make it a workhorse choice. While it doesn’t dazzle like the 6iE, it outperforms in technical reliability and safety compliance, especially in demanding installations.

Don’t let the price fool you—the meross Smart Thermostat packs a staggering amount of intelligence into a budget-friendly package, making it the smartest value play for high-voltage heating systems. With full HomeKit, Alexa, and Google Assistant support, it offers true hands-free control without requiring a hub or bridge. The open window detection is a standout: it senses sudden temperature drops and pauses heating automatically, a small feature that delivers real energy savings. Its energy monitoring with live and historical data gives users granular insight into consumption—rare at this price point.

In daily use, the 7×24 graphic schedule makes programming intuitive, and the 1°F accuracy ensures consistent comfort. It handles loads up to 3840W at 240V, making it suitable for most baseboard and radiant systems. The pure white LCD blends seamlessly into walls, and the power-off memory ensures settings survive outages. However, it requires 4+ wires for installation, which can be a dealbreaker in older homes with 2- or 3-wire setups. Also, while the Meross app has improved, it still lags behind industry leaders in speed and stability—some users report occasional disconnects.

Against the Aoresac Tuya model, the meross unit is in a different league—offering far superior integration, accuracy, and automation. While the Aoresac is cheaper, it lacks energy monitoring, open window detection, and reliable HomeKit support. The meross thermostat is ideal for renters or DIYers wanting full smart home control without breaking the bank. For those who want Apple HomeKit and energy tracking on a budget, it delivers exceptional bang for the buck—just verify your wiring before buying.

The Aoresac Smart Thermostat is the bare-bones entry point into smart floor heating—ultra-affordable and functional, but best suited for users who want basic automation without frills. It runs on the Tuya platform, so setup is straightforward via the ‘Tuya Smart’ app, and the 6+1 programming lets you set six weekday schedules plus a weekend mode—enough for simple routines. The NTC temperature sensor delivers decent accuracy within its 5–90°C range, and the LCD touch button interface is responsive, if not particularly bright or modern.

In real use, it performs adequately for small rooms or secondary spaces like sunrooms or garages. The embedded design fits standard wall boxes, and it handles 16A loads—sufficient for most underfloor mats. However, the lack of floor sensor input (despite claims) means it only measures air temperature, which defeats a key benefit of radiant floor control. The Tuya app is functional but clunky, and voice control via Alexa or Google is inconsistent. There’s no energy monitoring, geofencing, or adaptive learning, so you’re trading intelligence for savings.

Compared to the meross model, the Aoresac is half the price but half the capability—it lacks HomeKit, open window detection, and reliable automation. It’s best for budget-conscious users in dry, low-traffic areas who just want remote scheduling and basic Wi-Fi control. While it gets the job done for simple setups, it’s not ideal for primary living spaces or homes with flooring sensitivity. For those starting their smart home journey on a tight budget, it’s a viable first step—but expect to upgrade as needs grow.

The MATTER-enabled smart thermostat from this Tuya-powered line is a game-changer for smart home purists who demand universal compatibility. As one of the first on the Tuya platform to offer native HomeKit control via Matter, it eliminates the need for third-party bridges or unstable workarounds. This means seamless, secure integration with Apple devices, Alexa, and Google Assistant—all from a single device. The 5+1+1 weekly programming (weekday, Saturday, Sunday) is flexible enough for most households, and the 35% energy savings claim holds up in real use thanks to precise scheduling and adaptive behavior.

During testing, the Matter protocol delivered rock-solid stability, with no dropouts or re-pairing issues—a common pain point with budget thermostats. The LED touchscreen is bright and responsive, and features like weather forecast, clock, and dynamic lighting add a touch of flair. It supports 16A loads across 95–240V, making it suitable for most electric heating systems worldwide. However, installation instructions can be vague, and the lack of a floor sensor input limits its use in true underfloor setups unless paired with an external probe.

Against the meross model, this thermostat offers broader ecosystem support and Matter future-proofing, but with a less polished app and no open window detection. It’s perfect for tech-forward users who want one thermostat to rule all smart homes, especially those invested in Apple’s privacy-first ecosystem. While it doesn’t have energy monitoring like meross, its Matter backbone ensures long-term compatibility and security. For those building a unified, cross-platform smart home, this thermostat is the most forward-thinking budget option available.