7 Best Thermostats for Hydronic Radiant Floor Heating 2025

This game-changing WiFi thermostat redefines control for electric radiant floor heating with its dual voltage support (120V/240V) and Class A GFCI integration, making it a top-tier safety and performance choice. The 3.5-inch color touchscreen delivers an ultra-intuitive interface, while dual sensing—measuring both air and floor temperatures—ensures precise comfort without overheating delicate surfaces like wood or laminate. It directly tackles user frustrations around energy waste and complex programming by offering adaptive learning, which self-adjusts runtime based on usage patterns, and remote access via smartphone, giving you full control whether you’re across town or overseas.

In real-world testing, the UWG4-4999 shines in multi-zone setups, handling up to 3600W at 240V with ease and supporting secondary relays for expanded system control. The power logging feature is a standout—delivering detailed energy reports to your phone or PC—ideal for cost-conscious users aiming to optimize heating cycles. It performs exceptionally on tile, stone, and wood floors thanks to its floor temperature limiting function, preventing damage from excessive heat. However, some users may find the Tuya-based app slightly laggy during initial setup, and the WiFi connection can be finicky if your router uses a weak signal near the thermostat.

Positioned as the premium pick, it outclasses budget models like the Azel D-28F by offering smart connectivity, GFCI protection, and adaptive programming, while going toe-to-toe with the Honeywell TH115 in reliability but adding modern features the Honeywell lacks. It’s ideal for homeowners who want set-it-and-forget-it automation with remote oversight, especially in primary residences where comfort and efficiency are priorities. Compared to the B0FCKZN1NB budget smart model, this unit delivers superior build quality, safer GFCI integration, and more robust software features despite a higher cost.

Don’t let the price fool you—the B0FCKZN1NB is a powerhouse of smart functionality, packing WiFi control, voice compatibility, and dual-sensor intelligence into a sub-$50 package that redefines value for tech-savvy homeowners. It supports dual voltage (120V/240V) and uses both floor and air sensors to prevent overheating while maintaining room comfort, a rare combo at this price. The 0.5°C precision tuning ensures silky-smooth temperature transitions, and Tuya app integration enables remote scheduling, geofencing, and voice commands via Alexa or Google Assistant—making it a seamless fit for modern smart homes.

During testing, the thermostat proved surprisingly responsive, with near-instant app feedback and reliable Bluetooth pairing during setup. It handles loads up to 3600W at 240V, suitable for most residential electric mats, and the flame-retardant UL94 V-0 housing adds peace of mind in wet areas like bathrooms. However, the plastic build feels less premium than higher-end models, and the GFCI function is absent—raising safety concerns in code-sensitive installations. It also lacks adaptive learning, meaning you’ll need to manually fine-tune schedules for optimal efficiency.

Compared to the OJ UWG4-4999, this model sacrifices GFCI protection, adaptive programming, and energy logging, but wins on affordability and core smart features. It’s perfect for renters, secondary bathrooms, or DIYers upgrading a single zone without breaking the bank. Against the Azel D-28F, it offers far more control and automation, though it requires a stable WiFi network and isn’t suitable for hydronic-only systems without power.

The Honeywell TH115-AF-GA is the gold standard for reliability in radiant floor heating, leveraging a legacy of HVAC excellence to deliver a no-nonsense, 7-day programmable thermostat that just works—year after year. With dual sensing (ambient, floor, or combined mode) and built-in GFCI protection, it ensures both safety and precision, critical for electric systems in wet locations like bathrooms or kitchens. The robust mechanical design feels industrial-grade, and its C-UL-us certification confirms compliance with North American safety codes, making it a favorite among electricians and builders.

In real-world use, the TH115 excels in primary living areas where consistent scheduling matters—think lowering temps at night and warming floors before morning showers. It handles 120V/240V systems with a 15A load, sufficient for most residential zones, and the floor sensor prevents overheating of wood or laminate finishes. However, the interface is dated, relying on basic buttons instead of touchscreens, and lacks smart connectivity—no app, no voice control, no remote access. While dependable, it doesn’t adapt to lifestyle changes like newer models with learning algorithms.

When compared to the OJ UDG4, the Honeywell matches it in GFCI safety and dual sensing but falls short on user experience and modern features like adaptive programming. It’s ideal for homeowners who prioritize durability and code compliance over bells and whistles. Against the budget B0FCKZN1NB, it offers superior build quality and safety certification, though at nearly triple the price, making it a long-term investment rather than a quick upgrade.

The B08QJS8MV8 strikes a rare balance—delivering Class A GFCI protection, dual sensing, and 7-day programmability at a price that undercuts nearly every comparable unit, making it the best value pick for safety-conscious installers. Its auto-voltage detection (120V/240V) simplifies installation across different circuits, while the 3600W capacity at 240V supports large rooms or high-heat zones. The backlit LCD ensures readability in dim bathrooms or basements, and the cETL-listed GFCI meets North American safety standards, tripping at 5mA leakage to prevent shocks or fires.

In testing, the thermostat proved highly reliable, with smooth programming via intuitive buttons and solid sensor response across tile and engineered wood floors. The floor temperature limiter effectively protects sensitive materials, and the ON/STANDBY switch allows seasonal shutdown—perfect for summer months. However, the app-free design means no remote control, and the Tuya-based interface (if present) isn’t mentioned in specs, limiting smart home integration. It also lacks adaptive learning, relying on manual schedules for efficiency.

Versus the Honeywell TH115, it offers similar GFCI and dual-sensing features at half the price, though with slightly less brand trust. Compared to the OJ UWG4, it misses out on touchscreen and WiFi, but wins on cost and core safety. It’s ideal for DIYers or contractors installing code-compliant, programmable control without overspending. For the price, it delivers exceptional safety and functionality, outperforming many pricier thermostats in essential features.

The OJ UDG4 is a masterclass in focused design, offering a luxurious 3.5-inch touchscreen, Class A GFCI, and dual-sensor control without the complexity of WiFi—making it the ideal choice for users who want modern ease without smart home dependency. Its adaptive programming learns your schedule and adjusts run times to maintain comfort while cutting energy costs, and the install wizard simplifies setup even for first-time users. With support for 120V/240V systems up to 3600W, it’s powerful enough for whole-room coverage in bathrooms, kitchens, or mudrooms.

In real-world use, the touchscreen is responsive and glare-resistant, and the thermostat integrates seamlessly into modern interiors with its sleek profile. The floor sensor prevents overheating of wood and laminate, and the vacation mode maintains frost protection during extended absences. It handles wet environments with confidence thanks to C-UL-us wet room certification, and the 3-year warranty with U.S. support adds long-term peace of mind. However, the lack of WiFi means no remote adjustments, and you’ll need to be on-site to tweak settings.

Compared to the WiFi-enabled OJ UWG4, the UDG4 trades remote access and energy logging for a lower price and simpler operation—perfect for users who prefer local control with premium feel. Against the Honeywell TH115, it wins on user interface and adaptive learning, though both share GFCI and dual sensing. It’s best for homeowners who want a high-end, code-compliant thermostat without app clutter or subscription fatigue.