Best Thermostats for Underfloor Heating: Smart Controls for Cozy Floors
Choosing the right thermostat for your underfloor heating system ensures comfort, energy efficiency, and easy control. This guide highlights five reliable options that support 120/240V, dual sensing (air and floor), and built-in protections to keep floors warm without wasteful energy use. Each entry includes key features to help compare capabilities for homes, remodels, or new builds.
| Product | Brand | Voltage | Key Feature |
|---|---|---|---|
| MAXKOSKO WiFi Smart Thermostat | MAXKOSKO | 120V/240V | WiFi control, voice assistant, energy saving |
| SASWELL Programmable Thermostat | SASWELL | 120V/240V | 5+2 programmable, dual mode |
| OJ Microline UTN4-4999 | OJ Electronics | 120V/240V | Built-in Class A GFCI, dual sensing |
| Warmup 6iE Smart Thermostat | Warmup | 240V | SmartGeo, energy saving app control |
| Honeywell TH115-AF-GA/U | Honeywell | 120V/240V | 7-day programmable, floor sensor |
Note: All five selections support common underfloor heating setups and offer protections like ground fault circuit interrupters (GFCI) where applicable, ensuring safety alongside comfort.
MAXKOSKO WiFi Smart Thermostat For Floor Heating
The MAXKOSKO thermostat is designed for 120V/240V systems with a touchscreen LED display. It supports remote control via WiFi and works with voice assistants like Alexa and Google Assistant. Features emphasize energy savings through programmable settings and compatibility with most underfloor heating systems, making it suitable for retrofit projects and new installations alike.
SASWELL Programmable Thermostat For Electric Floor Heating
This 120V/240V thermostat provides a 5+2 programmable schedule with dual mode (Floor and Room) options. It integrates a built-in GFCI for safety, and its dual sensing supports precise temperature control for both air and floor. The device aims to balance comfort with energy efficiency, ideal for homes with diverse flooring materials.
OJ Microline UTN4-4999 With Built-In GFCI
The UTN4-4999 is a non-programmable, dual voltage (120V/240V) thermostat with dual sensing and a built-in Class A GFCI. It’s designed for straightforward operation and immediate warmth, making it a solid choice where simple control is preferred. The included floor sensor helps tailor heat to flooring materials while ensuring safety and reliability.
Mysa Smart Thermostat Lite For Line Voltage
The Mysa Thermostat Lite targets line voltage applications (120V/240V) for electric baseboard and similar heating. It emphasizes an energy-saving mode with custom schedules and a no-subscription app experience for ongoing remote control, energy reports, and smart integrations—supporting practical, long-term efficiency in underfloor heating setups.
Honeywell TH115-AF-GA/U Radiant Heating Thermostat
Honeywell’s TH115-AF-GA/U is a seven-day programmable thermostat designed for radiant floor heating with line voltage. It includes a floor sensor and a GFCI, delivering a reliable, programmable solution for maintaining comfortable floor temperatures while protecting occupants and flooring materials from overheating.
Buying Guide: Key Considerations For Underfloor Heating Thermostats
When selecting a thermostat for underfloor heating, consider the following factors to ensure optimal performance and value:
- Voltage and Compatibility: Most systems use 120V or 240V. Confirm dual voltage support if you plan to reuse hardware across different circuits or future upgrades.
- Dual Sensing: A combination of air and floor sensing helps maintain comfort without overheating flooring materials. Floor sensors are especially important for tile, stone, and wood floors.
- Safety Protections: Built-in GFCI protection reduces shock risk and electrical fires. Verify certification and ease of testing the GFCI function.
- Programmability: Programmable (including 5+2 or seven-day schedules) saves energy by tailoring heat to occupancy patterns. Non-programmable options are simpler but less energy efficient.
- Connectivity: WiFi, app control, or voice assistant compatibility adds convenience and potential energy savings through remote adjustments and smart routines.
- Floor Type Compatibility: Ensure the thermostat supports your flooring material (tile, laminate, wood, carpet, stone, etc.).
- Return On Investment: Look for devices with clear energy-saving features, easy installation, and reliable customer support to maximize savings over time.
- Warranty and Support: A solid warranty and USA/Canada product support can reduce long-term maintenance concerns in radiant floor projects.
Practical considerations include ensuring proper sensor placement, following installation instructions for GFCI testing, and matching thermostat capabilities to your system’s power rating (watts and amps). In retrofit projects, confirm existing wiring can accommodate the thermostat’s current draw and check local electrical codes for GFCI requirements.