Stripped Anode Rod

The method I use to get seized anode plugs out of residential water heaters is to start drilling in the center of the nut with a small drill bit and keep stepping up the size of the bit I'm using untill I get as close to the threads as possible without damaging them. Keep in mind, the threads are tapered and the diameter inside of the tank is smaller than what you see on the outside. The plug material is malleable, so when you get it thin enough, you can start to tap it from the outside edge towards the center of the hole with an old screwdriver and a hammer - it will bend and usually split and separate from the outer threads and you can then pull it out with needle nose pliers. I usually use small Vise-Grip needle nose pliers so I don't drop the remainder of the plug into the tank if I have previously cut the head of the plug off with a Sawzall, which I usually do so I have a better idea of how close to threads I am drilling.

Not actually knowing the the condition and length of an anode rod in a residential water heater, I will only use this method on gas water heaters because once the hole is drilled through the plug, any remaining anode rod will drop to the bottom of the tank. This isn't a problem with a gas water heater, but could be dangerous with an electric water heater if the anode ends up falling against an element. You don't have to worry about this with your RV water heater, however.

Bruce