If I got 10 years out of this one, maybe it's time. I usually get an el cheapo from HD, which is what this one was, I'm sure.
Looks like another el cheapo is only $329, so I may go that route anyway. These things rust inside don't they? Maybe that's the problem.
Performance 40 Gal. Medium 6 Year 4500/4500-Watt Elements Electric Tank Water Heater