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We bought our first 2 family house. It is equipped with 50-gallon AO Smith water heater from 90s. My wife complains a lot that she runs out of hot water during her insainly long bath. And this is before we rented second floor. Given that I cannot change the wife, what can I do about the water heater?

I guess the choices are: – get 75G heater with fast recovery.
- get tankless gas heater. (I saw a lot of bad rep about it before).
- get second heater and route pipes for the second floor.
- something else.

please advice