Q:

Meaning of the applicance wattage range 2000-2400W that is written on a tally

Checking power consumption of a kettle with a wattmeter it shows constantly about 1970W (close to the lowest value of the wattage range on the ketler that is 2000W).
What does mean upper up to 2400W wattage range provided on the kettle's tally?
In which circumstances 2400W consumption can happen when boiling water?
Update to answers:
In dockerhab, when kettle is in use, I can see constantly ~2000W power consumption until the end when kettle powers off / water is boiled (values arrives via mqtt broker)
2020-05-28 07:44:30.618 [vent.ItemStateChangedEvent] - GosundSP111-7 changed from 1973 to 1970
2020-05-28 07:44:30.621 [vent.ItemStateChangedEvent] - GosundSP111-7 changed from 1970 to 1973
2020-05-28 07:44:31.617 [vent.ItemStateChangedEvent] - GosundSP111-7 changed from 1973 to 1987
2020-05-28 07:44:33.625 [vent.ItemStateChangedEvent] - GosundSP111-7 changed from 1987 to 1973
2020-05-28 07:44:34.622 [vent.ItemStateChangedEvent] - GosundSP111-7 changed from 1973 to 1983
2020-05-28 07:44:35.624 [vent.ItemStateChangedEvent] - GosundSP111-7 changed from 1983 to 1973
2020-05-28 07:44:38.629 [vent.ItemStateChangedEvent] - GosundSP111-7 changed from 1973 to 1984
2020-05-28 07:44:39.630 [vent.ItemStateChangedEvent] - GosundSP111-7 changed from 1984 to 1973
2020-05-28 07:44:41.635 [vent.ItemStateChangedEvent] - GosundSP111-7 changed from 1973 to 1987
2020-05-28 07:44:42.635 [vent.ItemStateChangedEvent] - GosundSP111-7 changed from 1987 to 1973
2020-05-28 07:44:42.937 [vent.ItemStateChangedEvent] - RaspberryOpenhabTemperature changed from 48.3 to 47.8
2020-05-28 07:44:44.640 [vent.ItemStateChangedEvent] - GosundSP111-7 changed from 1973 to 1970
2020-05-28 07:44:45.640 [vent.ItemStateChangedEvent] - GosundSP111-7 changed from 1970 to 1982
2020-05-28 07:44:46.640 [vent.ItemStateChangedEvent] - GosundSP111-7 changed from 1982 to 1970
2020-05-28 07:44:47.643 [vent.ItemStateChangedEvent] - GosundSP111-7 changed from 1970 to 1973
2020-05-28 07:44:49.943 [vent.ItemStateChangedEvent] - RaspberryOpenhabTemperature changed from 47.8 to 48.3
2020-05-28 07:44:50.646 [vent.ItemStateChangedEvent] - GosundSP111-7 changed from 1973 to 1970
2020-05-28 07:44:51.647 [vent.ItemStateChangedEvent] - GosundSP111-7 changed from 1970 to 1973
2020-05-28 07:44:53.658 [vent.ItemStateChangedEvent] - GosundSP111-7 changed from 1973 to 1970
2020-05-28 07:44:53.667 [vent.ItemStateChangedEvent] - GosundSP111-7 changed from 1970 to 1973
2020-05-28 07:44:54.653 [vent.ItemStateChangedEvent] - GosundSP111-7 changed from 1973 to 39
2020-05-28 07:45:02.661 [vent.ItemStateChangedEvent] - GosundSP111-7 changed from 39 to 3
2020-05-28 07:45:04.663 [vent.ItemStateChangedEvent] - GosundSP111-7 changed from 3 to 0

A:

Does the nameplate also state a voltage tolerance range, such as 230-240V? Because that would make a difference in the wattage. In a load that is a fixed resistance, Power (watts) varies at the square of the voltage change. So if the kettle is rated for 2000W at 230V, but you apply 240V, the new voltage is 240/220 = 109%, so it will consume 1.09sq. the amount of power, so roughly 120% power, i.e. 2400W.

