Yes, Theo switches on again after a power failure and your settings will be saved. For that reason, he can also be operated using a timer.
If you want to connect the device directly to the water outlet, you can insert the drainage hose into the device. Then connect the hose to the internal drain valve on the back of Theo. Place the other end of the drainage hose directly over the water outlet. Please note that the outflow end of the hose should be lower than the inflow end so that the water can drain off.