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Karcher ones (or at least mine) can be rigged to draw from a water butt or reservoir with a particular hose
https://www.amazon.co.uk/K%C3%A4rcher-4-440-238-Suction-Check-Valve/dp/B000BFJ7F8
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My Karcher will run from a water butt or even a bucket on a chair - admittedly at much lower delivery pressure than from a mains supply. The trick seems to be having the bucket higher than the washer and filling the hose etc. by siphoning before switching on - it's not very good at priming by sucking water up from a low level, and air locks cause alarming noises.
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no experience with them - and would not be sure of the power of the jet but looks like its on the right track - supply a bucket of water though.
Pressure washers. No outside tap. Don't want to run off kitchen tap out window, it'll come off I'm sure. Don't want hand pump one.
Is there one that runs off a tank rather than avtap?
Ta