The constant-temperature electric kettle keeps the water at a certain temperature, and does not need to be boiled repeatedly, thus playing the role of heat preservation and being harmless to human body.

Extended data:

Boiling water is not the longer it is boiled, the healthier it will be. Boiling water for a long time will lead to concentration and increase the content of nitrite. Moreover, such water threatens health.

Generally speaking, it takes 2-3 minutes to boil water, and drinking water for more than 5 minutes is not recommended.

Boiling water for too long will produce chloroform exceeding the standard. If you drink this boiled water for a long time, it will interfere with the gastrointestinal function of the human body, which will eventually lead to diarrhea, diarrhea and other symptoms, and may even cause cancer in severe cases.

References:

Baidu encyclopedia-boiled water