You can set the Boost Time and Temperature on the Settings page in the App or Web Interface.
Boost can be activated from the Home page in the App or Web Interface, or directly on the thermostat by pressing the Boost CH button.
How do I set and use the boost?
Set Boost time and temperature in Settings. Activate Boost via the App, Web Interface, or thermostat. If Boost Only is enabled, tap the left side of the screen - or anywhere if using a combi boiler - to start heating boost.