I don't know whether this is appropriate for this sort of forum, but what would be the difference between microwaving standard tap water and boiling it in a kettle? Not just any water, but hard London tapwater (eek), with all sorts of delicious impurities. There's a marked difference in taste between the two, that's for sure. I assumed microwaving would be better because of the lack of limescale but I was proven wrong. Why?