ESP32 Tasmota OpenTherm Thermostat BLE
In the previous article we have created a simple opentherm enabled thermostat which uses an internal temperature sensor and controls boiler temperature to reach more comfort without indoor overheating and thus reducing gas bill. However you might want to control heating in a room, than does not contain wall unit or wall temperature sensor. For instance you're upgrading heating system in existing house and no new wires can be installed. So let's use one of the Xiaomi's fancy BLE-enabled temperature sensor to help improve your heating automation.