A pressure washer has a pump that takes water from a garden hose and boosts the pressure up to 1,000 PSI or more. The pressurized water coming out of the spray wand then dislodges the dirt and grime and that collected on house sidings, driveways, vehicles and gutters.
Power washers come in two types: electric and gas. Electric pumps can deliver in the range of 1,300-1,400 psi (pounds per square inch) at about 1 1/2 gpm(gallons per minute). Electric washers are more suitable for light cleaning work, such as cleaning outdoor grills, garage floors and washing cars. They should always be connected to power outlets that have an integrated ground fault circuit interrupter (GFCI).