I was surprised to find the only way to use the water heater on electric with my new 2012 Wind Jammer 3001W was to go out side. I looked through the manual and could not find how to run the unit on electric. I finally found the switch hidden in the lower left corner on the exterior behind the access door.
I would think they would have wired a switch on the interior control panel next to the existing water heater switch.
I went under the sink cabinet and removed the panel covering the back of the heater. I found they plugged the heater into an outlet mounted on the cabinet frame work.
I turned off the breaker and cut the wire going to the outlet and installed a junction box near the same location. I cut a hole under the electric outlet on the right side of the oven door and mounted a retrofit box in the hole. Then I ran a wire to the to the junction box and wired the outlet so that when I installed a lighted switch in the retrofit box it would turn on the water heater. I wired the switch so that when the switch is in the on position the indicator light shows the water heater is on with electric.
The cost was minimal and the project didn't take very long. Now I can stay warm, dry and turn on the heater