I'm not sure where I should have posted it, but I have a question if it's code legal to put a small tankless electric hot water heater in series after a tank heater to supply the entire house. It's a vacation home and the idea is to not keep the tank hot all the time but still have at least some hot water available when you first arrive at the house. See:

http://www.terrylove.com/forums/show...ries-with-tank