[Carriage Hill]

Far better and more efficient, Tankless, Point-of-Use Water Heaters:

https://www.rheem.com/products/residential/water-heating/tankless/

[brianl703]

Yes, you’ll just need a huge electric service or huge gas piping, depending on how it’s powered.

Tankless water heaters cannot be installed without a huge expense because of that.

[Svartalfiar]

Far better and more efficient, Tankless, Point-of-Use Water Heaters:

Better and more efficient until you actually want hot water. Had a couple buddies who've had them, they all complain about the lack of truly hot water, especially if you're running anything else at the same time as the shower.