Dan wrote:
If my electric water heater is not providing adequate hot water for a
20 minute shower anymore is it time for total replacement or just
replacing the thermostat? TIA, Dan

You are taking a "Hollywood Shower." Have you considered the alternative of
the "Navy Shower?"

1. Turn on shower, get wet all over.
2. Turn off shower.
3. Lather and scrub.
4. Turn on shower, rinse.
5. Turn off shower.

Total resources: Less than 3 gallons of water in only two minutes.

It's for the children.