Reply To: using hot water from tank on shabbos

Little Froggie: If you remember your physics class in high school, you’d realize that water always tries to find its equilibrium. The water in the tank will automatically run out of the tank,without any kind of pistons or pressure. As long as the inlet of the cold water is shut (as the posters indicated), all you have is the hot water running out of the tank. Nothing else and with no problem whatsoever in halacha.