To control hot water through IFTTT you can use the tado° Hot Water Service which includes several triggers and actions. To get an overview have a look at our tado° IFTTT Services.
Automatic manual control activation
All changes made via IFTTT will automatically activate Manual Control on the tado° device. You can change the duration of Manual Control through the tado° app by going into Settings > Rooms & Devices > Room name > Manual Control, on the tado° device.