Photonicinduction's 10-second kettle[1] managed about 10kW max (took around 5s to boil water) for a short time, 440V 23A. Then the resistance dropped, it went up to 16kW (426V 33A) and popped. 7-8kW (375V 19A to 400V 20A) seemed more sustainable.
2500W on 240V, single phase AC, 16A, German 'Schuko'-plug is normal. Or was. Some EU-regulation limits that to 2000, or even 1500W only now, for new devices, or something.
Don't care. Still have the old ones, and whatever the electrician wired as '120V 3-phase AC' for the full US-style range in the US.
Seriously though, a 15A kettle sounds great.