I don’t really think tea brewed at a lower temperature tastes the same, I’m guessing it’s because the relative rates that different flavor compounds go from the tea to the water change at different temperatures, but the main noticeable effect is that tea brewed cold is usually less astringent for a given concentration of other flavor.
you can make tea by just putting a tea bag in cold water and letting it sit for a few hours.
We make iced tea all the time without any hot water it tastes the same as if you boil the water. Just takes longer and of course isn’t warm.
I don’t really think tea brewed at a lower temperature tastes the same, I’m guessing it’s because the relative rates that different flavor compounds go from the tea to the water change at different temperatures, but the main noticeable effect is that tea brewed cold is usually less astringent for a given concentration of other flavor.