There are several important technical specifications about pressure washers that homeowners should know. By understanding the features, homeowners could avoiding overpaying for a power washing machine. The first decision should be about the power source of the pressure washer. Electric types have limited mobility because they must be plugged into an outlet, usually through long extension cords. Gas pressure washers offer maximum portability and they can be used at any location outside a house. Next, homeowners should decide the maximum PSI rating that is needed for their washing tasks. It does make sense to buy expensive pressure washers with more than 3,000 PSI if they are going to be used for light duty jobs.