The bad effects of water boiled too often?!
Answers: if you are asking if water boiled many times is bad for you, then no. (think about the earth...the water here has boiled many times before we even got here). it might start to taste like the pot you boiled it in, though. :-)
One bad effect is that is makes your fish die if you use it in an aquarium.
The other bad effect is that if you boil water for too long, you won't be left with any.
the only possable healthy promblum would be from heavy metals leeching from the pot into the water.pottery cotainers being the worst with lead possable reaching toxic levels.