One added thought. Dick's suggestion to use penetrating oil and tapping and time, rather than using brute force right up front, is the right way to do it. Then, once you get the (oily) threads loosened, try VERY HARD not to get oil into the interior of the tank. Clean off the inside thread in the tank plug and the outside thread on the anode rod right away, and do NOT run the anode rod back in before cleaning. If oil drips or seeps inside, it is hard to get the taste out of your drinking water.
Bill
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