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you don't need to use even 1,400W for a vacuum cleaner

I used to work for a vacuum cleaner manufacturer.

Back then, there was a machine on the market that was advertised as being able to pick up a bowling ball. "And how often do you need to do that?" was the first thing that cam einto my miond, but didn't seem to occur to many...

You don't need much power at all to clean a room - air is not a particularly dense medium, and accelerating it to the appropriate speed isn't hard. But you do need to ensure that the airflow isn't blocked; the vacuum itself doesn't perform any cleaning, it is the airflow into that vacuum that carries the dirt.

So it's pretty much all about the design of the pickup head; power is largely irrelevant.

Vic.