Netatmo has added new functionality to their smart radiator in the form of open window detection. It works by detecting a sudden drop in temperatures and then shuts off the smart radiator valve. This is like the functionality found on the tado smart radiator thermostats, but you do not need a subscription for the automatic turning off part.
The feature works by using the built-in thermostat to watch out for a sudden drop in temperature. It will automatically either adjust the temperature or completely turns the radiator off with the smart valve. The open window detection feature will also notify the user via the Netatmo Energy app.
Once the window is closed, the Smart Radiator Valve will then turn back on or will turn back on automatically, 30 minutes after detecting the window had been open originally. All these settings are customisable within the Netatmo Energy app, so you don’t have to have the radiators turn off at all when the window is open if you prefer.
The new feature is free and available via a software update through the Netatmo app. As mentioned tado, who offer an ‘open window detection’ function for their Smart AC Control devices. But unless you pay a subscription, it is all down to the user to turn things off following a notification.