One of the most basic but most crucial things to learn about brewing tea is the importance of water temperature. Incorrect water temperature can alternately rob a tea of its full flavor profile or bring out too much flavor, resulting in harshness and bitterness. But how do you know the correct water temperature for a specific tea, and what is the best way to achieve it?

There are no hard and fast rules for anything related to tea, and personal experimentation will almost always bring better results than following somebody else’s instructions. However, general guidelines can often guide your experiments in the right direction and take blind guesswork out of the picture. Japanese green tea generally produces the best flavor from 140º-160º F. Because the leaves are often broken into small pieces, higher water temperature will bring out astringency more quickly and destroy the leaves’ delicate flavors. Since Chinese green tea receives pan-firing and has a generally more complete leaf profile, it is usually best brewed in the range of 160º-180º, although some people claim that the highest grades of Chinese greens should be able to withstand boiling water without becoming bitter. Though I personally haven’t found this to be true, the point is that, depending on the Chinese green tea, you could potentially get great results anywhere from 160º all the way to boiling water.

White tea is often described as needing low (170º) water temperature, but I’ve found that it can actually withstand temperatures as high as boiling water without becoming especially harsh—it all depends on how full you want the flavor to be, and what tastes good to you. Since oolong teas receive a variety of oxidation levels during processing, they are often best brewed from 190º to boiling. Black teas are fully oxidized and are generally best brewed with boiling water; the higher temperature will bring out all of the flavor, and bitterness will usually be minimal as long as the steeping time isn’t too long. A notable exception to this guideline is Darjeeling black tea, which often includes some less oxidized, greener leaves and sometimes benefits from a considerably lower water temperature. I have a friend who loves Darjeeling and claims that certain teas reach their optimum flavor at extremely specific temperatures—“Try this one at 174º,” he’ll say. “There’s a note at that temperature that you just can’t get at 173º or 175º.” Now that’s what I call experimentation!

The ultimate point to all this is that water temperature is one of the most important variables in tea making, next to steeping time and the amount of leaves used. Pinpointing a specific degree may or may not be crucial, but a bit of temperature experimentation with the same tea will surely convince you that temperature does make a difference. From there, it’s only a matter of finding which temperature makes each tea taste the best to your taste buds. I’ll be back soon to offer some specific techniques regarding exactly how to get your water to the sorts of temperatures mentioned above.

–Zero