Where is the AC switch for 2011 MPG 181 water heater?

I am a new owner of a 2011 MPG 181, my first travel trailer.

I've watched all the videos I can find on YouTube, but I CANNOT find a switch to operate my water heater using AC power! Apparently, there should be something that looks like a light switch, just around the corner from the thermostat and status/pump/heater switches. There is nothing there! I also checked outside to see if there is a switch in the water heater service compartment (whatever it's called), but there isn't. I don't understand what's going on. Do I have the only camper with a water heater that only runs off of propane? Has anyone else run into this?
 
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