What's the power difference of the three model?
Model Min. Suction Power Med. Suction Power Max. Suction Power
E20 600 1000 2000Pa
E30/E31 600 1000 2200Pa
The max. suction power of E30/E31 is 10% more powerful than E20, and will clean deeper.
However, the items that can be sucked in are determined by the size of the suction inlet and the level of the suction power. The suction inlet of these models is the same, so if the suction power is stronger, it will be easier to get the larger item into the Dust Bin (but the size of the item should be smaller than the suction inlet).
Here is a picture for your reference:
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