Water for brewing tea is divided into three levels based on temperature: low temperature, medium temperature, and high temperature. Low temperature refers to 70-80 degrees, medium temperature refers to 80-90 degrees, and high temperature refers to 90-100 degrees.
Different teas have different requirements for water temperature, as water temperature is crucial for bringing out the tea's characteristics. Different teas require different brewing temperatures due to their varying degrees of fermentation. For example; low temperature water is suitable for brewing Longjing, Biluochun and other green teas, and the earlier the tea is harvested, the lower the water temperature required; green teas like Liuan Guapian that use open-leaf tea leaves, as well as lightly fermented Oolong teas made from tender leaves, are suitable for brewing with medium temperature water; for brewing Oolong tea, Pu-erh tea and scented teas, a larger amount of tea leaves is used each time, and since the tea leaves are older, they must be brewed with 100-degree boiling water.
Typically, when using tap water or bottled water to brew tea, the water needs to be boiled first and then cooled to the appropriate temperature. If using spring water of good quality to brew tea, it may not need to be boiled, but can be heated directly to the suitable temperature. The water for brewing tea should never be boiled for too long, as this will reduce the gas content in the water, which is not conducive to the release of the tea's aroma. The so-called "water should not be over-aged" refers to this principle.