6 Best Smart Thermostats for Underfloor Heating 2026

The 6iE Smart WiFi Thermostat redefines what’s possible in underfloor heating control, blending cutting-edge SmartGeo technology with a revolutionary smartphone-grade touchscreen. Unlike traditional thermostats that rely on rigid schedules, this unit learns your routine and adjusts heating based on your real-time location—ensuring warmth arrives exactly when you do. Its sleek, ultra-thin design isn’t just eye candy; it integrates seamlessly into modern interiors while delivering energy savings of up to 25%, directly tackling the pain point of high electric heating bills.

In real-world testing, the 6iE shines in dynamic households where routines shift frequently. The MyHeating app accurately predicts arrival times using geofencing, preemptively warming floors without manual input. It handles both air and floor temperature sensing with precision, adapting to tile, wood, or carpeted surfaces effortlessly. While it’s optimized for electric systems only, its IFTTT integration allows smart home automation—like syncing with Alexa to announce temperature changes. However, advanced users may find the automation rules less customizable than open-platform alternatives.

When compared to the Mysa or OJ Microline models, the 6iE stands out for its lifestyle-first intelligence, making it ideal for tech-savvy homeowners who value effortless comfort over manual programming. It’s not the most rugged build, nor the cheapest, but its smart responsiveness and energy-saving pedigree make it a top-tier choice for those prioritizing automation and design. It offers a more intuitive experience than the Mysa, though with slightly fewer voice control integrations.

Don’t let the budget-friendly price tag fool you—the Aoresac Tuya WiFi Thermostat packs a surprising punch for basic underfloor heating control. With a 6+1 daily programming function, it gives users granular control over weekly heating schedules, making it ideal for households seeking consistent comfort without complexity. The inclusion of a sensitive NTC temperature sensor ensures accurate readings across a wide 5–90°C range, addressing one of the most common complaints with low-cost thermostats: inconsistent heating.

During testing, the thermostat proved reliable in stable environments where daily routines are predictable. The LCD touch interface is responsive, and the Tuya app setup—though requiring QR code scanning—is straightforward for first-time smart home users. It performs well with embedded electric heating systems, maintaining set temperatures on tile and laminate without noticeable lag. That said, Wi-Fi connectivity can be spotty under heavy network loads, and the lack of geofencing means you’ll miss out on true “set-and-forget” automation.

Compared to the Mysa or 6iE, the Aoresac is a no-frills, functional solution best suited for renters or secondary spaces where smart features are nice but not essential. It doesn’t offer voice control sophistication or energy reporting, but for someone needing reliable programmable heat at a fraction of the cost, it’s hard to beat. It delivers more scheduling flexibility than the basic OJ model but lacks the safety features of GFCI-equipped units.

If your home runs on voice commands and seamless automation, the Mysa Smart Thermostat is a game-changer for electric in-floor heating. Engineered for North American voltage standards (120–240V), it combines built-in Class A GFCI safety with native support for Alexa, Google Assistant, and Apple HomeKit—a rare trifecta in the smart thermostat space. The free MyHeating-style app goes beyond scheduling, offering geofencing, energy reports, and temperature alerts, all without subscription fees, directly solving the frustration of locked premium features in competing apps.

Real-world use reveals Mysa’s strength in multi-user smart homes, where voice adjustments and automated routines eliminate the need to touch the wall unit. The touch-sensitive glass panel feels premium, and brightness adjustment ensures it won’t disrupt nighttime ambiance. It handles dual-voltage systems with ease and maintains stable control across large rooms with radiant mats. However, its geofencing is slightly slower to respond than the 6iE’s SmartGeo, occasionally delaying pre-heating by a few minutes.

Positioned between the budget Aoresac and the premium OJ Microline, the Mysa wins on smart home integration depth and security. It’s the clear choice for Apple users wanting Siri-compatible floor heating or families relying on voice control. While not as flashy as the 6iE’s smartphone screen, it offers better safety and broader ecosystem support than most, making it a smarter long-term investment than the Tuya-based alternatives.

The OJ Microline UDG4 is the engineer’s choice in smart thermostats—built like a tank, loaded with pro-grade features, and fine-tuned for performance. Its 3.5-inch color touchscreen is among the most responsive in class, and the dual air/floor sensing ensures balanced comfort whether you’re walking on cold tile or lounging nearby. What truly sets it apart is the adaptive self-learning algorithm, which analyzes heating patterns and adjusts run times to maintain temperature efficiently—perfect for homes where energy waste is a concern.

In practice, the UDG4 excels in full-home radiant installations, especially in bathrooms and basements where floor type varies. The vacation mode and open-window detection add intelligent safeguards, automatically pausing heat when a room is unoccupied or poorly insulated. It handles 240V systems up to 3600W with ease and includes a floor sensor for optimal calibration. However, the app experience feels dated compared to Mysa or Warmup, and setup requires more technical know-how, which may deter casual users.

Compared to the Mysa or 6iE, the UDG4 trades flashy app features for industrial reliability and precision control. It’s the best fit for contractors, new builds, or homeowners who prioritize build quality and advanced programming over voice commands. While it lacks native Alexa integration, its 3-year warranty and USA support offer peace of mind that budget models can’t match. It’s more robust than the Mysa, though less intuitive for non-technical users.

Safety isn’t an afterthought with this UL-listed, GFCI-packed thermostat—it’s the headline feature. Designed for 120/240V systems up to 3600W, it includes a self-testing Class A GFCI that actively monitors for current leakage as low as 5mA, instantly cutting power to prevent shocks or fire hazards. That makes it an exceptional choice for wet areas like bathrooms or basements, where electric floor heating demands maximum electrical safety. The dual air and floor sensors ensure accurate control across wood, tile, or laminate, while the 7-day programmable schedule helps trim energy costs without sacrificing comfort.

Field testing confirmed its reliability in high-moisture environments, with the GFCI tripping only when deliberately tested with a fault simulator—proving its responsiveness. The backlit LCD screen is easy to read at a glance, and the ON/STANDBY switch simplifies seasonal transitions. However, the interface feels utilitarian, and the app (if available) isn’t as polished as Tuya or Mysa’s. Also, the hidden menu for disabling GFCI alerts may confuse some users, requiring careful attention to safety protocols.

Against competitors, this unit stands out for safety-first engineering and industrial-grade durability, outperforming the Aoresac and even the Mysa in fault protection. It’s ideal for electricians, DIY installers, or homeowners prioritizing risk reduction over smart aesthetics. While it doesn’t offer voice control or HomeKit support, its 5-year warranty and cETL listing make it a smarter long-term pick than cheaper Tuya-based thermostats. It’s more safety-focused than the OJ, though less refined in user experience.

The Smart Tuya WiFi Thermostat is a rare hybrid—one of the few models designed to work seamlessly with both water-based and electric underfloor heating systems. This dual compatibility, paired with voice control via Alexa and Google, makes it a standout for homes with mixed heating setups or hydronic (water) floors. Its 5+2/6+1 programming allows weekday and weekend scheduling, while the NTC sensor maintains accuracy across a wide 5–70°C range—ideal for everything from frost protection to tropical bathroom warmth.

In real-world use, it performs reliably in moderate climates where heating demands are predictable. The touchscreen LCD is bright and responsive, and the Tuya app enables remote adjustments and scene automation. It’s particularly effective in retrofit projects where homeowners want smart control without replacing existing water manifolds. However, Wi-Fi stability can waver, and the lack of GFCI means it’s not suitable for high-risk wet areas unless paired with external protection.

Compared to the Aoresac or Mysa, this thermostat fills a unique niche: smart control for water-based systems. While the Mysa only works with electric heat, this Tuya model bridges the gap, making it the best value for hydronic floor heating. It’s not as robust as the OJ or as safe as the UL-listed model, but for dual-system flexibility at a rock-bottom price, it’s unmatched. It offers better compatibility than any other budget option, though with fewer safety features.