I contend that you don’t save anything by putting a timer on a water heater. Letting it get cold while it’s off only means you have to spend more energy to get the water warm again when the timer is on. Then there’s the convenience of having hot water any time you want it day or night and being able to charge you car anytime you want. The volt only needs a 16A EVSE on a 20 A circuit, but some people buy higher capacity EVSEs to future proof a bit. I have a 30A one just in case I buy something else that can use it. Alas, the stupid electrician that Bosch sent me put it on a 30A circuit, so I had to configure dip switches to max out at 24A so I don’t melt anything. Lesson learned. I’ll wire up my own 40A circuit if and when I buy a Tesla or anything else that can use more juice then reconfigure to use the full 30A.