Old-Biscuit wrote:
Might not work due to plug with anode on it is the threaded part which should heat up and then when you spray with cold air the bung area that plug is screwed into will probably cool off first and contract.
I've removed several anodes and more than a few nuts and bolts using the method I described. It works unless the tank has gone years without the anode being removed and rusted beyond repair.
Heating up the tank/water and then hitting the anode with compressed air causes a difference in temp between the anode nut and the tank. Simple high school physics. Heat expands and cold contracts. Any mechanic or farm boy will have learned that.