Putting in the replacement hot water heater took about five minutes, and it's working fine.
While we wait for it to leak, or explode, I wanted to link to a clip of John Wayne saying, "It's quiet, too quiet," and to that end I watched about twenty minutes of The Lucky Texan which someone on the web thought might be the origin of that quote. That was all I could watch. If I didn't know it was almost 80 years old, I would have thought that they had distilled every Western trope into one movie, but actually it's more like the Ur Western, every subsequent movie with a horse owes a debt to it. Anyway, I found this, which is more accurate anyway.