I put in an electric tankless water heater and it is awesome. Both my wife and I are able to take showers at the same time run laundry...
I could have sworn I added the buying and install to my Mazatlan thread but I have not been able to find it in search.
We used to have a medium size tank under here; my wife has already filled up the space where it used to be.
We bought a German one and thought we could make the electrical work for it but that's where I realized these things are picky about the electrical. I took it back and got a Rheem RTX3-18.
The next important thing for me to figure out was how to run the proper electrical to it. So move the placement to the primary bathroom underneath the sink which has the electrical panel on the opposite wall and easy to get to.
Great placement for it because now I get instant hot water at the sink and at the primary shower.
Yeah you have to do the electric exactly how they specify and each model seems to be a little different.
Our building is all electric there is no gas. If you can do gas there are many choices and you don't have to deal with the electric.