It is a plug in the bay with your power cord, then there's a breaker in your main breaker box, then just plug Rv in. Now the previous owner of mine never unplugged it so it was always on & burned up.
Plug it in & look at your Surge guard display, it should show 10 or so amps, another way to test is to unplug the 110 cord to the heater while it's all hooked up, if it draws a spark when you unug it, it's working
Or use a ohm meter on the cord to test it
Mike & Becky
2005 Crescendo 8356