Reply To: using hot water from tank on shabbos

froggie, Haleivi and nisht: I know-FOR A FACT- that many people who shut off the cold water valve before shabbos STILL get their hot water from the tank! (see also earlier posters). froggie, this has nothing to do with the cold water pushing the hot water out. Water will try to find its level,based on the source of water from far away- simple physics! talk to a professor of physics or a real engineer- you may get the right answers!