Karcher are rubbish unless you get up into the professional grade level, the impellers are plastic on the pumps so break easily if not treated well on lower end models
Nilfisk by comparison (as I have one) use a metal impeller, have a similar range of accessories (inc adapters for other items) and cost less for similar spec models
There are some good deals on the Nilfisk ones at Screwfix at the moment. You do get what you pay for, as the really cheap Karcher washers can be pretty poor quality.
i went for the nilkfisk c120 after my kracher died on me. the patio cleaning attachment isn't as good at the K version but everything else seems better.
Just stay away from the brakes - pressure washers remove the grease from the caliper slides and can eventually lead to binding brakes.
Just being pedantic but plunger-type pumps in pressure washers don't use impellers. But yeah I've seen the inside of some Karcher models using plastic pump parts. It's not necessarily a bad thing though if they use the right plastics and in suitable locations. If their use of inappropriate materials is causing failures though then it's a problem. Strangely I have an older model which IIRC is all-metal?
Had both Karcher & Kew Nilfisk Alto at work & personally preferred the Nilfisk. Spares were cheaper & never had any complaints from customers. The only job I wouldn't use a pressure washer on is block paving as it takes all the sand out between the bricks.
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