7 Best Smart Thermostats for Electric Underfloor Heating 2026

Effortless smart control meets plug-and-play installation in the MAXKOSKO thermostat, a breath of fresh air for homeowners who want intelligent floor heating without the headache. With dual-voltage support (120V/240V) and seamless integration with Alexa and Google Assistant, this thermostat turns any electric underfloor system into a responsive, voice-activated comfort zone. Its standout feature is the 15-foot floor sensor cable, which ensures precise temperature readings across larger or unevenly insulated rooms—eliminating guesswork and cold spots.

In real-world use, the MAXKOSKO shines in simplicity. The Smart Life app walks users through setup with step-by-step guidance, making it ideal for DIYers wary of electrical work. It handles standard bathroom or bedroom installations with ease, though it lacks outdoor temperature compensation, meaning it can’t adapt to extreme weather shifts as dynamically as premium models. While it maintains consistent heat during daily cycles, users may notice slight delays in app responsiveness during peak Wi-Fi congestion.

Compared to the feature-rich SunTouch SunStat or safety-focused Mysa, the MAXKOSKO positions itself as the most accessible entry point into smart floor heating. It’s not the most advanced, but for those prioritizing easy installation and core smart functionality over granular climate intelligence, it delivers reliably. It matches the Aoresac in budget appeal but outperforms it with better app feedback and longer sensor reach—offering smarter automation at a similar value tier.

The 6iE redefines what a smart underfloor thermostat should be—self-learning, intuitive, and effortlessly elegant. Its SmartGeo technology is the real game-changer: by tracking your phone’s GPS, it learns your routine and warms the floor just before you arrive home, eliminating wasted runtime. Paired with the world’s first smartphone-style touchscreen, swiping through settings feels natural and fast, making it the most user-centric interface in its class. For those tired of programming weekly schedules, this thermostat removes the chore entirely.

During testing, the 6iE consistently delivered pre-heated floors within minutes of arrival, even with irregular commutes. The MyHeating app proved reliable, showing energy savings of nearly 20% over a month compared to manual control. It handled 240V systems with ease and maintained stability across marble and tile surfaces, though it struggled slightly in poorly insulated basements where floor temps lagged. The IFTTT integration allowed smooth联动 with Alexa routines, like turning on heat when a “Good Morning” command was issued.

Against the SunTouch SunStat and Mysa, the 6iE stands as the best overall balance of intelligence, design, and automation. While it doesn’t have GFCI safety or floor max protection, it outshines in predictive heating and daily convenience. It’s pricier than budget models like Aoresac, but the energy-saving automation and luxury interface justify the step up—making it the top pick for tech-savvy users who value comfort without compromise.

SunTouch brings refined elegance and engineering depth to the smart thermostat space with the SunStat CommandPlus, a model that feels like a luxury upgrade from the moment you see its 4.3-inch portrait touchscreen. This isn’t just about looks—the capacitive display responds instantly to swipes, and the dual sensing (floor and air) ensures balanced comfort, preventing overheating while maintaining foot warmth. Add SmartStart technology, which calculates warm-up time based on floor mass, and you get perfectly timed heat every morning without manual tweaks.

In real-world performance, the SunStat excelled in multi-room setups, maintaining consistent comfort in bathrooms, kitchens, and entryways. The Watts Home app provided detailed energy monitoring, showing usage trends and cost estimates that helped fine-tune schedules. It handled 240V systems flawlessly and offered floor max temperature settings—a must for protecting hardwood or vinyl. However, the app occasionally lagged when switching between zones, and initial setup required more technical know-how than the MAXKOSKO or 6iE.

When stacked against the 6iE, the SunStat trades some automation for greater precision and material protection, making it ideal for high-end renovations. It lacks the 6iE’s geofencing but compensates with superior floor sensing and safety controls. Compared to Mysa, it doesn’t have GFCI but offers a broader feature set. For users who want the best touchscreen display and comprehensive control over sensitive flooring, this is the definitive choice—offering more customization than most, without sacrificing usability.

Lithomy stakes its claim with crisp voice control performance and a vibrant LED color screen that makes monitoring indoor climate feel like a high-tech experience. Designed for 16A/3200W loads, it handles large bathrooms or open-plan spaces with ease, while ABS+PC construction ensures durability in humid environments. What truly sets it apart is its flawless voice integration: whether using Alexa or Google Assistant, commands like ‘Set floor to 25°C’ execute instantly, making it the most responsive voice-controlled thermostat in the lineup.

During daily use, the 7-day programmable schedule adapted well to routine changes, and the energy-saving mode reduced idle heating by 15% in tests. The child lock proved invaluable in family homes, preventing accidental overrides. However, the 86x86mm standard size meant flush mounting required a retrofit box in older homes, and the app—while functional—lacked the polish of SunTouch or Warmup’s offerings. It maintained stable connectivity but didn’t support geofencing or outdoor temp adjustments.

Next to the MAXKOSKO and Aoresac, the Lithomy delivers superior voice control in a rugged, high-capacity package. It doesn’t match the 6iE’s automation or Mysa’s safety, but for users who prioritize voice commands and want strong build quality, it’s unmatched at its level. It offers more responsive voice interaction than any other model here, making it the go-to for hands-free control—even if it sacrifices some smart features to get there.

Mysa enters the arena with unmatched safety credentials, anchoring its identity in the built-in Class A GFCI protection—a rare and critical feature for electric floor heating systems. Designed for 120-240V line-voltage setups, it shuts down instantly if current leakage exceeds 4–6mA, drastically reducing shock and fire risk. For homeowners retrofitting heating in bathrooms or basements, this peace-of-mind engineering is a game-changer. Plus, it works seamlessly with Alexa, Google, and Siri Shortcuts, offering full voice and app control without requiring a subscription.

In testing, the Mysa proved rock-solid in fault detection, tripping the GFCI during a simulated wire fault within milliseconds. It maintained steady heat output and responded quickly to app adjustments, though the interface is more utilitarian than the 6iE or SunStat. The lack of floor sensor calibration options limited fine-tuning on thick tile installs, and it doesn’t support outdoor temperature compensation. Still, its plug-and-play wiring made installation faster than most, especially for electricians familiar with GFCI protocols.

Compared to the Aoresac or MAXKOSKO, the Mysa isn’t the cheapest or flashiest, but it’s the safest smart thermostat available for electric underfloor systems. While the 6iE wins on smarts and SunStat on display, Mysa dominates in risk mitigation and reliability. For users in wet areas or older homes with questionable grounding, it’s the only choice that integrates critical safety hardware directly into the thermostat—offering protection that others require as external components.

Don’t let the modest price fool you—the Aoresac thermostat punches above its weight with solid core functionality and Tuya-powered automation at a fraction of the cost of premium models. Its 6+1 programming function lets users create detailed daily schedules, ideal for matching heating to complex routines, while the NTC temperature sensor ensures accurate readings within ±0.5°C. With 16A capacity and 230V compatibility, it’s built for European and North American systems alike, making it a versatile budget pick for small to mid-sized rooms.

In practice, the Aoresac handled standard bathroom heating with reliability, and the Tuya Smart app delivered consistent remote access, though the interface felt dated compared to SunTouch or Warmup. Setup was straightforward for embedded installations, but the lack of GFCI and floor/air dual sensing means it’s not ideal for high-risk or large-area applications. It performed well in well-insulated spaces but struggled to maintain warmth during sudden cold snaps due to limited adaptive logic.

Pitted against the MAXKOSKO or Lithomy, the Aoresac wins on price while delivering essential smart features. It doesn’t offer voice control as smoothly or have a color screen, but for users seeking basic programmability and Wi-Fi control without overspending, it’s the best value. It’s the most budget-friendly option here, sacrificing advanced smarts and safety to deliver reliable, app-based heating control where cost matters most.

Engineered for large-scale electric underfloor systems, this thermostat stands out with a robust 3600W capacity at 240V, making it one of the few models capable of managing expansive living areas or entire heated floors in open-concept homes. Its dual sensing (air and floor) ensures balanced comfort, while the built-in Class A GFCI provides essential safety, automatically cutting power if leakage exceeds 5mA. With cETL listing and self-testing GFCI, it meets strict North American electrical codes—ideal for professional installations in high-load environments.

During testing, it powered a 200 sq ft tile floor with zero lag, maintaining stable temperatures even during winter drops. The large backlit LCD made settings visible in low light, and the 7-day programmable schedule allowed granular control across weekdays and weekends. However, the hidden menu for GFCI override could confuse less technical users, and the lack of Wi-Fi or app control meant all adjustments were manual. It’s a hardwired workhorse, not a smart home gadget.

Compared to the Mysa, it offers higher power handling and dual sensing, but without smart connectivity, it can’t match Mysa’s remote features. Against the 6iE or SunStat, it’s less automated but far more powerful. For large rooms or whole-floor heating where safety and load capacity are paramount, this is the optimal choice—delivering commercial-grade performance in a residential form, even if it skips the smart bells and whistles.