If you would like to reset Eve Energy (UK Model) so it goes back to 0.00 kWh, the procedure is straightforward.
Re-installing the app is not necessary.
1) Go to the Eve app Settings, select Accessories, and choose Eve Energy.
2) At the bottom of the screen, find the Remove Accessory option and press it
3) A dialog will appear - confirm that you wish to delete all historical data
4) Perform a hard reset by plugging in Eve Energy (UK Model) into the power outlet. There is a button on the side of the unit. Press it until the red LED is blinking.
5) Add Eve Energy to the Eve app again