I have a used electric water heater I had replaced for my wife's aunt after it quit working. I suspect it needs either an element or a new control. Before doing anything else, I pulled the anode rod to try to assess the tank's condition, and only about a foot of 1/8" wire was left on the rod. I have a new rod I can put in this heater.

Question: Does the condition of the rod I pulled tend to indicate the tank might already be damaged?