For cleaning large areas and grimy objects outdoors, high pressure washers can't be beat. With a powerful stream of water up to fifty times as strong as an ordinary garden hose, pressure washers can tackle tough jobs quickly while using much less water to accomplish the task.
Pressure washers come in electric and gas configurations. Electric pressure washers are portable and affordable, but not as powerful as gas pressure washers. Even the smallest gas pressure washer is more powerful than the largest electric pressure washer. A gas-powered pressure washer, however, cannot safely be used in enclosed or poorly-ventilated areas.
The power in pressure washers is measured in pounds per square inch (PSI). The higher the PSI, the faster and more effective the pressure washer will be at breaking the bond between the surface and the stain you are trying to clean. Another measurement that is used to compare pressure washers is gallons per minute (GPM). Water flow is measured by GPM; the higher the GPM, the more surface area a pressure washer will clean in a given amount of time. The final measurement of a pressure washer is called Cleaning Units (CU), and is simply the water pressure multiplied by the water flow rate. The higher the CU, the better the cleaning power of a given pressure washer.
Pressure washers are roughly categorized into three classes based on their cleaning capacity:
Take your time to carefully evaluate pressure washer options, as they range in price from just a few hundred to several thousand dollars. Local home improvement stores and industrial equipment dealers offer many choices in pressure washer models. Some highly-rated manufacturers to consider include: