Depending on the altitude you cook at, the boiling point of water may be lower than 212 °F. This means that certain ingredients like e.g. milk may boil over at lower temperatures than 212 °F and food may need longer time to be done when cooked at high altitudes.
Please refer to https://en.wikipedia.org/wiki/High-altitude_cooking to get a feeling for the boiling point of water at certain altitudes. Vorwerk, LLC does not take any responsibility for the information on this website.