I'm just starting to think about options for moving and/or replacing my water heater. I'm fascinated with the idea of "tankless" systems. Is it really possible to have an entirely "tankless" house? Or must I still have a traditional water heater as well as the individually positioned "boosters" at each water point? I lived in China for a while and I did quite well without a central water heater and only a water heater for the shower.