[RickFLM4]

So 4 months later...

This isn't happening. Major electrical work required to get an electric tankless heater. Alternatively we could go with a gas tankless heater if we bury a propane tank in the yard (above ground not allowed where I live). So, the end result is skipping the tub in the bathroom remodel because it would cost $10K - $15K for tub / heater / electric or gas. (There is a tub in another bathroom.) We are just gonna stick with a new tank for the shower and sinks and leave it at that. Unbelievable how much time it took to reach this conclusion.