This is what I’m dealing with – The cold water input upper threads are completely rusted away. The hot water output is in better shape, but I still plan to replace them both. I’m concerned about how difficult they will be to remove (without stripping the internal tank threads). I have a large pipe wrench that should work well. Also, I will replace the anode, which is in a seperate location. I have sprayed some penetrating oil around the threads to hopefully make removal easier.