This is a sensor that is exposed via the evohome RF integration returning a % of heat demand for that zone (or even a specific actuator), however easy to create a binary sensor of that via template in case heat demand is >0%.
This is a sensor that is exposed via the evohome RF integration returning a % of heat demand for that zone (or even a specific actuator), however easy to create a binary sensor of that via template in case heat demand is >0%.