Can the water in the water dispenser be boiled repeatedly?

The water in the water dispenser can be boiled repeatedly. Although the water is boiled repeatedly, the nitrate in the water will be converted into nitrite, which will turn hemoglobin in the human body into nitrite hemoglobin, making red blood cells lose their oxygen-carrying function.

However, it takes 100 degrees Celsius for nitrate in water to be converted into nitrite. When the water in the water dispenser is heated to 85 degrees Celsius, it will stop heating, so the water in the water dispenser can be heated repeatedly.