Finally found instruction manual for the water heater. It's an Atwood. Could be either a 4-E or 10-E or neither. Pulled open the panel and it looks alot different from the manual illustrations. Only thing I see that might be the drain plug is on the bottom with a bunch of rust around it. It seems to be threaded for a hose to be attached. If that's the plug, is all I gotta do is pull it - wait for it to drain and then put it back?
Would think I should disconnect my water hose from the RV first. It will not be re-attached.