What is the SpeedBoost function and are there any limitations on when I can use it?

SpeedBoost heats large amounts of water faster than the maximum heat level 9 and is available on all elements. However, it can only be activated if no other element in the same group is already operating — if another element in the group is on, the › and Š symbols will flash and the cooktop will automatically revert to heat level 9. In Group 2, the SpeedBoost function may be activated simultaneously for all elements. (Page 15)