Understanding the PSI and GPM of Your Pressure Washer

Published:

8/1/2018

How much pressure is too much for your pressure washer? Although you may think that you can never have enough to clean the grime and dirt that sits in front of you on your car, driveway, or industrial equipment, it might not be the pressure you should be focused on. Instead look to the flow rate!


Both the amount of pressure measured in pounds per square inch (PSI) and the flow rate measured in gallons per minute (GPM) are key factors in improving your pressure washer’s efficiency and overall performance.

PSI Defined

PSI measures the amount of pressure applied when cleaning a surface. This factor varies between models providing you different options for your specific pressure washing needs.

GPM Defined

GPM is the flow rate, or amount of water coming out of your pressure washer per minute. This measurement determines how long you need to sufficiently clean the surface you are tackling.


When it comes to pressure washing, the PSI takes care of removing the grime from the surface, but the GPM moves the grime away. So with both of these factors proving equally important in your pressure washing ability, we must take both into consideration when choosing our pressure washing tool for our next project!


In order to clean your car, patio and furniture, and other small-structured outdoor surfaces of your home, an electric pressure washer with less than 2,000 PSI should do the trick.


For a larger deck, siding, vehicles and boats in both your home or business, a gas-powered pressure washer with a higher PSI and producing around 2.5 GPM can get the job done.


If you’re looking to tackle a professional, heavy-duty cleaning project like industrial-site equipment and surface preparation, a gas-powered pressure washer with a higher PSI and GPM should be utilized.


For whatever pressure washing needs you may have, call on the experts at NorTex Sales & Service! We offer only the best hot- and cold-water cleaning equipment on the market. Call us at 214-630-7310 to learn more about our cleaning equipment and services!


Related Reading: 

Operating Your Pressure: Flow Rate the Key to Success