fyi, Atwood's do not have an anode rod, the tank is made with a different material than the Suburban's. The Suburban's need the anode rod. If the switch is hard to operate, replace it also, it will quit working expectantly. I agree with the replacing the heating element, it will be burned out with no water.
03 Silverado cclb 3500 drw, D/A, Reese 22k hitch
07 Alfa SeeYa Gold 30RL,2 slides,power everything