How Pressure Washer Works

Pressure washers are part garden hose and part air compressor. A typical pressure washer has either a gas-fueled engine or electrical powered motor that powers a water pump. The pump accelerates the water, supplied from a garden hose, to produce high pressure. The washer is hooked to a high pressure-rated hose. At the end of the hose is a water gun that looks similar to the pressure guns used at car washes. When the trigger is pulled, the water mixes with the air and comes out of the nozzle.

Pressure washers can aggressively blast things clean with water jets pressurized at about 75 times the pressure of a garden hose. Or, they can gently spray with lower pressures for delicate cleaning. Pressure washers are commonly rated by Pounds per Square Inch (PSI) which gives power to penetrate the dirt and grime. and Gallons per Minute (GPM) which gives you the power to break down dirt and wash it away.

The high-pressure of the jet not only cleans more effectively but means you're wasting around 80 percent less water than if you used an ordinary low-pressure hosepipe (which is more economical if your water is metered).

When choosing the best pressure washer for your needs, there are two general cleaning terms to understand. Overall cleaning performance is determined by how these work together. The higher the numbers, the faster you can clean.

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