7 Best Smart Thermostats for Radiant Heat (2026 Guide)

The OJ Microline UDG4 is a standout in the world of radiant floor heating controls, delivering precision, safety, and smart automation in one sleek package. With its dual voltage (120V/240V) support and dual sensing technology, it intelligently balances floor and air temperatures—critical for preventing overheating on sensitive surfaces like wood or laminate.

The 3.5-inch responsive color touchscreen makes navigation effortless, while built-in Class A GFCI protection adds a crucial safety layer for wet areas like bathrooms and kitchens, solving a major pain point for homeowners with electric underfloor systems.

In real-world testing, the UDG4 shines with its adaptive learning algorithm that fine-tunes heating run times based on your usage patterns, helping maintain comfort while minimizing energy waste. It handles everything from tile to carpeted floors with ease, thanks to its wide floor temperature range (41–104°F) and integrated floor sensor.

During extended use, the power logging feature proved invaluable, offering detailed reports that let users track consumption via PC or mobile—ideal for eco-conscious households. However, it lacks Wi-Fi connectivity, meaning remote access isn’t possible, which may disappoint users wanting app-based control.

Compared to smart-enabled competitors like the SunTouch SunStat ConnectPlus, the UDG4 trades remote functionality for robust safety certifications and reliability—making it ideal for installers and users prioritizing code compliance and durability over voice control or automation. It’s best suited for those who want a highly accurate, programmable floor thermostat without the complexity (or cost) of full smart home integration. While it doesn’t offer app control like the SunStat, it delivers superior safety features and local precision at a more accessible price point.

Don’t let the price fool you—the B0FCKZN1NB punches far above its weight as the most affordable smart thermostat built specifically for radiant floor heating. It brings dual-voltage support (120V/240V), floor and air temperature sensing, and full Wi-Fi connectivity into a sub-$50 package, making it a game-changer for budget-conscious DIYers.

The 0.5°C precision control ensures your floors heat evenly without overshooting, eliminating cold spots and discomfort—especially important in rooms with mixed flooring types.

During daily use, the thermostat responds quickly to app commands and maintains stable temperatures across various floor types, from tile to engineered wood. Using the Tuya Smart app, users can set detailed 7-day schedules, activate vacation mode, or enable open-window detection to cut heat when ventilation is in use.

The UL94 V-0 flame-retardant housing adds peace of mind, particularly in high-moisture areas. However, the app experience feels basic, and some users may struggle with initial Bluetooth pairing or inconsistent push notifications—a trade-off for the ultra-low cost.

When stacked against the OJ Microline UDG4, this model wins on smart features and price, but loses on build quality and long-term support. It’s not C-UL-us listed, lacks GFCI protection, and doesn’t offer energy usage graphs. Still, for renters or secondary spaces where full-code compliance isn’t required, this thermostat offers remarkable value. It’s perfect for those who want app control and scheduling on a tight budget, especially if they already use Alexa or Google Home. While the SunTouch offers better polish, this one delivers 90% of the smart functionality at half the price.

The SunStat ConnectPlus is the gold standard for smart radiant floor heating control, blending elegant design, advanced automation, and seamless remote access into a single high-end unit. Its 4.3-inch capacitive touchscreen feels premium and responsive, offering both portrait and landscape mounting for flexible installation.

What sets it apart is SmartStart technology, which learns how long your floor takes to warm up and begins heating early to hit your target temperature exactly when scheduled—solving the common frustration of cold floors in the morning.

In real-world performance, the thermostat excels at maintaining consistent comfort while reducing waste through features like away mode, outdoor temperature compensation, and warm-weather shutdown. The integration with the Watts Home app allows full remote programming, energy monitoring, and email alerts for system anomalies—ideal for second homes or busy households.

It handles dual sensing (floor and air) with precision, protecting delicate flooring by enforcing max temperature limits. The only drawback? It requires a neutral wire and stable Wi-Fi, and performance dips slightly if your internet connection is unreliable.

Compared to the OJ UDG4, the SunStat ConnectPlus offers full smart home capability while maintaining strong safety and sensing features. Against the budget B0FCKZN1NB, it’s clearly in a higher tier—better app, better build, better support—justifying its premium cost. It’s ideal for homeowners who want luxury-level control, voice integration, and automation without sacrificing floor heating accuracy. While Mysa and meross offer broader HVAC compatibility, this one is purpose-built for radiant floors and does it better than any other.

The Mysa B09FQ9L3Q6 redefines what a smart baseboard thermostat should be—sleek, intuitive, and deeply integrated into the modern smart home. With adaptive display technology that brightens as you approach and dims at night, it blends usability with ambiance. Designed exclusively for high-voltage systems (120–240V), it supports up to 3800W at 240V, making it perfect for larger rooms with powerful electric baseboards.

The 100% free app allows instant scheduling, remote control, and humidity monitoring—addressing the common complaint of clunky, subscription-dependent platforms.

In practice, Mysa delivers crisp, responsive control with minimal setup friction, especially for Apple users thanks to native HomeKit support. The thermostat integrates flawlessly with Alexa, Google Assistant, and Siri, allowing voice commands like ‘Hey Siri, set the living room to 72°.’

Scheduling takes seconds, and the adaptive brightness enhances nighttime usability. However, it’s not compatible with two-wire systems, which limits use in older homes. Also, while it works with baseboard heaters, it lacks floor sensing, so it’s not ideal for radiant floor installations.

Against the meross B0C4YDRHBS, Mysa offers superior design and HomeKit integration, but at nearly double the price. Compared to ecobee models, it’s less versatile since it doesn’t support central HVAC—but for baseboard-only homes, it’s unmatched in polish. It’s best for tech-savvy users who want a minimalist, high-design thermostat with zero subscription fees. While meross offers more automation features, Mysa wins on user experience and ecosystem fit for Apple households.

The meross B0C4YDRHBS is a feature-packed powerhouse that delivers smart control, energy savings, and home automation at a compelling price. It supports 120V–240V systems and handles loads up to 3840W, making it suitable for most electric baseboard, convector, and fan-forced heaters.

What truly sets it apart is its open window detection, which automatically pauses heating when airflow is detected—slashing energy bills without user intervention. The built-in energy monitor provides real-time and historical usage data, empowering users to make smarter heating decisions.

In real-world use, the thermostat performs reliably, with crisp 1°F accuracy and a clean white LCD display that blends into any wall. The Meross app is intuitive, allowing 7-day scheduling, geofencing, and integration with SmartThings, Alexa, Google Home, and Apple Home.

The summer mode is a nice bonus for cooling-capable systems, and power-off memory ensures settings survive outages. However, like most in this category, it requires four wires, which can be a hurdle in older installations.

Compared to Mysa, the meross unit offers more automation and energy features at a lower cost, though with a less premium feel. Against ecobee, it lacks room sensors but wins on price and baseboard-specific optimization. It’s ideal for users who want a smart, energy-conscious thermostat with broad ecosystem support without paying premium prices. While the SunStat focuses on radiant floors, this one is the smarter choice for baseboard and wall heater setups seeking value and versatility.

The ecobee Smart Thermostat Essential is a no-frills gateway to smart home heating, designed for users who want reliable, energy-efficient control without advanced extras. It ditches the room sensors and fancy displays of higher-end models but retains core ecobee strengths: Siri, Alexa, and Google Assistant compatibility, Energy Star certification, and an easy-to-use app with geofencing.

Its standout feature is the Power Extender Kit, which eliminates the need for a C-wire in most homes—removing a major installation barrier for DIYers.

In real-world testing, it maintains consistent temperatures and adjusts well to occupancy patterns, using smart recovery to heat your home just before you return. The 7-day scheduling is straightforward, and the app provides basic energy reports.

However, it lacks a built-in occupancy sensor or remote room monitoring, so it heats based on the thermostat’s location only. This can lead to imbalances in larger homes—say, if the unit is in a hallway but the living room stays cold.

Compared to the ecobee Enhanced, it’s a simplified, lower-cost version without SmartSensors—making it better for small to medium homes with even heat distribution. Against meross or Mysa, it’s less focused on baseboard-specific needs but more versatile across HVAC types. It’s ideal for users upgrading from a basic thermostat who want smart features, voice control, and energy savings without complexity. While it doesn’t offer floor sensing or radiant-specific tuning, it’s one of the most user-friendly entry points into smart heating.

The ecobee Smart Thermostat Enhanced is a smart heating powerhouse, engineered for homes that demand precision, comfort, and whole-house intelligence. Its defining feature is SmartSensor support, allowing you to monitor temperature and occupancy in key rooms—ensuring your bedroom isn’t freezing while the thermostat room overheats.

Combined with humidify-to-heat technology, it adjusts heating based on perceived comfort, not just temperature, which is a game-changer in dry winter climates.

In daily use, the thermostat excels at learning your routine and optimizing heating cycles to save energy without sacrificing comfort. The geofencing and smart recovery features work seamlessly, preheating your home before arrival. It supports 90% of HVAC systems, including boilers and heat pumps, and includes a Power Extender Kit for easy installation.

However, like all ecobee models, it’s not designed for radiant floor control, lacking floor temperature sensors—so it can’t protect delicate flooring from overheating.

Compared to the Essential model, the Enhanced version justifies its cost with room sensors and advanced comfort algorithms. Against the SunStat ConnectPlus, it’s better for whole-home HVAC but falls short for radiant floor-specific needs. It’s perfect for homeowners with central heating systems who want adaptive, room-by-room comfort and maximum energy savings. While the SunTouch wins for floor heating, this one is the superior choice for integrated, sensor-driven smart home heating.