Versatile thermostat for complete control of HVAC systems - fan coil, underfloor heating, ventilation, and cooling. Compatible with external temperature sensors. Powered by Shelly - for smart automation, remote access, and effortless integration with the most common platforms. Control of underfloor heating valves, fan coil control, ventilation control - supports AC and DC fans, including control of 10V DC fans via an analog output. Control of the heat source - uses a relay with a potential-free contact to manage heat sources such as gas burners, pellet burners, etc. Compatible with electric underfloor heating - the thermostat can control a connected Shelly relay to turn the heating on or off based on temperature settings. RS485/MODBUS control. Frost protection function - prevents damage to heating pipes. Integrated humidity sensor. Temperature and humidity correction - adjusts thermostat readings for more accurate results. No hub required! Wi-Fi and Bluetooth connectivity. Wi-Fi range extender and BLE gateway. Powered by Shelly - equipped with a Shelly chip that supports all Shelly features. Smart schedules based on time or sunrise and sunset. Highly compatible! Easy control via the Shelly Smart Control app, most platforms and protocols, as well as voice assistants. Use it with Alexa, Home Assistant, or your preferred automation system. Common uses: thermostat, underfloor heating, heating and cooling, energy saving, valves.