Don’t complain if your tea is piping hot! Research shows tea too hot (above 65 °C, 149 °F) is dangerous to your health. The World Health Organization considers such drinks, to be potentially carcinogenic. Study details included: if they drank tea, what kind, how often, and how hot.
This study out of China revealed that drinkers of hot tea had a higher incidence of esophageal cancer as high has 1.5 times higher than those who do not drink hot tea. The hotter the tea the higher the likelihood of developing drinkers esophageal cancer.