Thanks a lot for your reply, Fourth Year.
After resetting thermostat several days ago, only top element was working, so only water at top of tank was getting heated. In between my Post & your’s, I changed thermostat, & as you say, only top thermostat was getting power, with water in tank cold. This was the same as before, except hopefully this time bottom element will kick in after top is hot! I’ll check that this morning.
BTW, I took out top element, since it had a minor leak. I looked OK, so I cleaned it (including sanding both seating surfaces) & re-installed it with a new rubber gasket. I’ve tightened it a few times, but it’s still leaking (even worse than before!!). Any suggestion? Silicone or some other liquid sealer, before final tightening?