Different teas have different optimal temperature requirements for the water that's being used.
Water that has been boiling for a long time will also taste different, as well as react differently to tea leaves (or ingredients, if you're cooking) than water that has been boiled for a lesser amount of time.
The More You Know ~☆ Though seriously, I didn't know all that.
Next, let's boil it.All we have to do is wait now, right?We need to boil it carefully.It's not good if we boil it too long.I've brought the water!How troublesome...