PSI (Pounds per Square Inch) measures water pressure—essentially how hard the water hits the surface that is being cleaned.

So, for example, if a pressure washer has a PSI of 2,000 and a GPM of 1.5, then it has 3,000 cleaning units. Gas vs Electric Like most lawn and garden equipment, pressure washers are available in both ...

Greenworks 3000 PSI Pressure Washer: At a Glance Our rating: 4.5/5. Buy on Amazon for $374.99. Testing the Greenworks 3000 PSI Pressure Washer.