@swagner that's different, increasing pressure just changes the boiling point, you don't actually heat past it. superheating is when the 'boiling' (i.e. bubble formation) doesn't start because there are no nucleation sites, despite the energy being sufficient for boiling. This is the same concept as 'supercooling', you can look up videos where they tap the side of a container of water and you can see ice spread rapidly as the water freezes.
it definitely wouldn't happen in a tub, but the point was just "can you heat water past the boiling point" and the answer is yes, although it's not a normal occurrence