I have a 5-year old gas hot water heater, approx. 40 gal. that I would like to remove/replace the anode for the purpose of extending the life of the heater. I have tried to loosen the hex nut on top of anode using a 1-1/16" socket equipped with handle and short length of pipe for leverage without success. If I push too hard, the hot water heater moves on concrete floor. I do not want to break anything but is there an easier way to remove anode than what I am doing? Lubricant, rust remover? I even had my plumber take a try at loosening the hex nut with short pipe on socket handle. He was not able to do so either. Any ideas or should I just forget it at this point? Please advise.

Jim