Find an old Ruud water heater made in the 1950s that has a monel tank. Pass it on to your grand kids.
An older plumber told me you could extend the life of the older upright tank water heaters IF you drained them out once every summer.
Just hook a hose onto the bottom of the tank. Run the hose outside and turn on the valve.
He told me this as he was replacing the electric hot water tank exactly 6 months to the date after the prorated warranty expired.