Using a water boiler with temperature control will allow you to make the best extraction possible from your favorite tea.
In general, water should never be boiled. Water loses its oxygen content when it is boiled, creating a flat taste. An excessively high temperature also risks “burning” the tea, and destroying the tea and its beneficial properties.
As a general rule, proper water temperatures are as follows:
175-185 degree water for white, green, and jasmine teas.
190-205 degree water for oolong and black teas.
205-degree water for herbal tisanes.