Our used motorhome came to us with an electric\gas water heater..Problem is the electric part is a HOT ROD add on,with an extension cord that has to be plugged in around front of the kitchen cabinet....
Our wh also has the Hott Rod add on element and we have no complaints for normal daily usage. If we are both going to take a bath, we turn on the gas side of things for quicker recovery, then turn the gas back off when done. It is a low wattage element which for us is good as less chance of throwing a breaker.
PO had it installed. we were lucky in that the element plugs into the same receptacle as the fridge. Our only issue with the Hott Rod is that it makes draining the wh a bit harder.