Cooking temperatures with non-stick cookwear
The temperature guidelines are for frying and can be completely ignored if boiling. Being full of water is a very effective way to limit the maximum temperature of a vessel. You'd avoid boiling dry in any container.

To be honest, the guidelines are essentially nonsense for any use. "Medium" varies too much between stoves and burners. For example with my large non stick pan, medium on the big burner would be only for very fast frying while medium on the middle size burner would be very gentle.