The higher the wattage, the more powerful the appliance.
900W
Dust capacity
The more the cleaner holds, the less often you have to empty it.
4.5L clean water / 3L dirty water
Hose length
The longer the hose, the easier it is to clean curtains, high shelves and ceilings. A hose longer than 3.8 metres can reach all parts of the stairs from the top or the bottom.