Interesting stuff...thanks.
As an aside comment, I attached the new heater in a different location. As such, it seems the new location is further away from the kitchen and upstairs lines /forums/images/graemlins/tongue.gif. I've noticed a longer lag time to get hot water to both of those locations. I'm sure that having a bunch of 3/4" pipe ahead of the final run to each location hasn't helped. I know though that by moving my location, I've now also moved my heater further away.
/forums/images/graemlins/tongue.gif OH well... that's why I use "hot" water when I brush my teeth in the mornings. That uses up all the cold water sitting in the hot line so that by the time I'm done, the faucet is putting out warm water and when I start my shower, the "hot" water is really there and available.