[TeMPOraL]

I don't know what you should or should not do, but I can tell you this: I drink black tea a lot, and I can easily tell whether one was made with water taken straight from the electric kettle after it automatically disengages, vs. one minute later, vs. from "hot" water from a coffee machine or a watercooler. The first one - straight after it finished boiling - is what tastes best to me.