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How to Choose the Best Pressure Washer
When you shop for a pressure washer, there are two important acronyms to know: PSI and GPM. Pound force per square inch (PSI) measures how powerful the water spray is. Gallons per minute (GPM) measures how much water goes through the spray wand at a time. The higher the PSI and GPM, the more forceful and heavy. For example, 2,000 PSI and two GPM (or lower for these) is a good rule of thumb for light jobs such as cleaning off a patio or getting mud off a car. For longer, more arduous tasks such as cleaning a driveway, you may need a medium-duty machine with a PSI up to 3,000 and GPM up to three, but most household jobs do not require a pro-grade, industrial PSI or GPM. It’s too much power and can strip surface paint or worse.
