1. If it burns, if you see that half is open, burn it for another two minutes and you can drink it.
2. For electric kettles look at the position of the heating element, if it is a heating tube it is far from the bottom. When the upper part is opened, the current part is not easy. to open. The effect of such a kettle is not good.
3. If the hotplate is on the bottom and only half is hot, you can still drink it after heating it for two more minutes.
Because when the water is boiled, the hot and cold convection will make all the water reach 100 degrees.