Been trying to post with no luck for 24 hours err.
Solar tank would be separate from tankless water heater. A tanked water heater would perform similarly because the thermostat would trip when pumping water in.
2 people + Guest (every month or so 3~4 extra people)
Also much of the time (25%) there is nobody there.
So what we have is a large variation in use, hence the Tankless.
Unsure of total gallons per day (depends heavily on occupancy, other factors)
http://www.boschhotwater.com/StartPa...7/Default.aspx <- Totally open to other options.
We are on a ground water well with poor flow (4gpm MAX, more like 3gpm) so total flow on a tankless isn't a huge deal.