I am drinking filtered water from different tap directly. but my parents (both Chinese) still drink boiled water, cool or warm, they believe boiled water is healthier. and I found these on line:
The Chinese have been drinking hot water since at least the 4th century B.C. At that time, hot beverages were seen to expel humidity from the body, while cold beverages could, naturally, cool the body down. But not everyone had access to the luxury of fuel for a stove. Thus, hot water was reserved for those who needed it the most, namely pregnant women, the elderly, and the sick.
And so, gradually, there grew to be a connection between health and hot water.
According to ancient Chinese medicine, drinking a glass of warm water in the morning helps kick-start the digestive system. Hot water and warm water, because of its temperature, supposedly aids blood flow. As your blood circulation increases, it helps detoxify your body and reduce painful contractions of muscles. Sore throat? Drink some warm water. Menstrual cramps? Stop drinking cold stuff and switch to some hot water.
On the other hand, cold water slows down organ function and causes muscles to contract.
Some Chinese people also believe that during meals, you shouldn’t be mixing hot food with cold water, as this creates an imbalance of temperature.