Wi-Fi Socket Generation 3 has a built-in wattage meter, so it will automatically determine the watt effect of the connected heater. Therefore, there is no need to enter this manually when setting up the gen3 socket in the app.
Wi-Fi Socket generation 2 does not have an integrated wattage meter. Therefore, you need to enter the wattage level of the connected heater in the app when connecting the gen2 socket.