Product description: Tuya - wall-mounted WiFi thermostat - TR021
The Tuya TR021 WiFi Thermostat is a highly practical solution for users seeking intelligent heating and air conditioning management in homes, offices, and other commercial spaces. Thanks to its built-in WiFi module and integration with the Tuya Smart system and Smart Life app, the Tuya TR021 allows for remote temperature control from anywhere. The touchscreen control panel with an LCD display allows for local operation while maintaining simplicity and comfort of use. The thermostat functions as a normally open relay , allowing direct control of 230V devices such as boilers, radiators, and heat pumps, as well as air conditioning and ventilation systems. The device offers the ability to set a daily or weekly schedule , allowing you to adjust the temperature to your individual needs. Automatic display dimming after switching to standby mode saves energy, thus extending the device's lifespan. Thanks to the open window detection function, the thermostat automatically turns off the heating or air conditioning when temperatures change rapidly, preventing unnecessary energy consumption. The thermostat works with popular voice assistants such as Amazon Alexa and Google Home and offers two power supply options: via a USB Type-C cable or three AAA batteries , providing flexibility in choosing the power supply method depending on the individual user preferences and installation conditions.

The Tuya WiFi TR021 thermostat provides the ability to share remote control options with other users.
Main features of the thermostat
- Normally open relay : possibility of direct control of heating devices powered by 230 V
- Heating and cooling mode : ability to control both heating and air conditioning or ventilation
- Touch control panel : intuitive and convenient operation thanks to the LCD display with backlight
- Energy saving : automatic display dimming when in standby mode
- Scheduling and automation : automatic daily or weekly cycles can be set, with up to six different time periods per day
- WiFi connectivity with Tuya Smart support : the ability to remotely control the heating using a mobile app and share it with other users, e.g. household members or colleagues
- Voice assistant support : Works with Amazon Alexa and Google Home via the Tuya app
- Open window detection function : automatic heating shutdown in the event of a sudden drop in temperature
- Two power supply options : can be powered via USB Type-C cable or 3 x AAA batteries
Frost protection
The Tuya TR021 thermostat ensures exceptional safety for heating systems in winter thanks to its frost protection function. If the temperature drops below a pre-set threshold, the device automatically activates the heating, preventing pipes and other system components from freezing . This solution is particularly useful in summer houses, garages, and basements, as well as anywhere else where the temperature may unexpectedly drop below 5°C . This feature ensures that the system will remain operational even during extended absences, while minimizing the risk of mold and moisture growth. This not only helps maintain the system in excellent condition but also ensures a healthy, safe, and comfortable climate in the home or other occupied space.
The hysteresis function allows you to maintain a stable room temperature and contributes to energy savings.
Precise temperature control
The thermostat offers hysteresis settings from 0.5°C to 10°C and temperature correction from -9.9°C to 9.9°C, allowing for precise adjustment of the device's operation to individual user preferences or room characteristics. This allows for effective calibration of temperature readings to ensure maximum thermal comfort and precise heating control. The hysteresis function limits frequent switching of the heating or cooling system , stabilizing the room temperature and enabling more efficient energy management.
Technical specifications of the Tuya WiFi TR021 thermostat
- Model: TR021
- Communication: WiFi 2.4 GHz IEEE 802.11 b/g/n
- Display type: backlit LCD with touch panel
- Setting accuracy: 0.5°C
- Temperature control range: 5°C to 35°C
- Power source: USB Type-C cable or 3x AAA batteries (not included)
- Hysteresis: 0.5°C to 10°C
- Sensor type: NTC
- Measurement accuracy: ±1°C
- Degree of protection: IP20
- Operating temperature: -10°C to 40°C
- Dimensions: 13.3 x 8.6 x 3 cm
Contents of the set
- 1x Tuya - smart WiFi thermostat - TR021
- 2 x mounting screw
- 1x User Manual
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