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The answer is some you can, some you can't I believe, I think most karchers can be, and they even sell an overpriced bit of hose to allow you to do it https://www.halfords.com/motoring/car-cleaning/pressure-washer-accessories/karcher-pressure-washer-suction-hose-909747.html
not really a DIY question I suppose but not sure where to put it - can you run karcher pressure washers (e.g. the K2) from a supply of water in a large bucket (i.e. instead of connecting it to a supply of water from a tap)? I have an awkward kitchen tap and don't think I'd be able to mount the hose to it