Just had to remove the unit from my '98 Pace Arrow. Turn off water, and remove two water lines from rear of heater. It might be difficult depending on where the unit is located. Turn off propane, if gas, & light stove to remove gas from lines. From the outside, remove the access door. Remove the gas line. Then remove the perimeter screws or rivets holding it to the body. I had to drill out the rivets. Pry unit out a couple of inches, and unplug the power connector. Then remove the unit. I found a 9 inch split across the top of the tank, and am replacing the tank. Why do you want to remove it? Is it leaking? Eddie Elk.
If I remember any step that I missed, I'll add it.