> That means JET could have boiled about 188 kg of water.

> only enough to boil about 60 kettles' worth of water

Exactly, no one has 3l kettles, but it's the right ballpark. You could also run about 9k kettles for that 5 seconds but not boil them, and if you tried to run 60 kettles consuming all that power for 5 seconds you would have quite the fire...