12 gallon water heater with a switch so I can turn it on and off as required

The water heater is so quiet I thought I had a wiring problem when I first turned it on. I wired an external 20 amp switch so I can easily turn it on and off without having to flip the circuit breaker every time I want hot water In my last shop, I made a decision not to plumb/wire in a water heater and that worked out well since: A)We were in Florida, and B)There was no shower