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There are 3 important pressure washer ratings that you need to remember when you are purchasing or renting a pressure washer. These pressure washer ratings will help you compare and choose the right pressure washer for your needs.

The PSI rating - PSI which stands for Pounds Per Square Inch. The PSI rating is a number used, like 1500 PSI, that defines the force of the water that the pressure washer is able to produce. The higher the PSI, the stronger the force of the water is.

Here is an example:
The typical garden hose produces about 40 PSI. In comparison, pressure washers can produce PSI's of 1,000 to 8,000+. Most pressure washers have adjustable PSI so I would recommend purchasing a pressure washer with more PSI then you think you need. You can always adjust the PSI down.

The GPM rating - GPM which stands for Gallon Per Minute, is the rate of the water flow. Or, how much water a pressure washer goes through within a minute of use. GPM is very important. It indicates the cleaning effectiveness of a pressure washer. The more GPM the faster your pressure washing job will go.

The CPU rating - CPU which stands for Cleaning Power Unit, is a pressure washers overall cleaning power. CPU is determined by multiplying the PSI by the GPM. The higher the CPU the better, faster and more efficiently the pressure washer will perform.