How does a pressure washer work and does it use a lot of water? The way that a pressure washer operates is that it is like a water pump thatis powered by an electrical motor. The washer receives regular water from the hydrant or faucet and the pump propells the water with a high enough amount of pressure and then shoots it from a hose at a high speed with a gun that has a trigger. The average amount of water that it uses is about 8 gallons per minute.
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