Electric pressure washers are best for light work and small jobs like washing down driveways and sidewalks or gently cleaning decks, patio furniture, or aluminum siding—figure projects that take 30 minutes max. Pressure, Power, PSIThe pressure output of your electric pressure washer, measured in pounds per square inch (PSI), tells you how much force it can apply to a surface. The maximum flow rate of electric pressure washers can range from 1.1 to 2.5 GPM. The Benefits of Electric Pressure Washers… And When You Need GasElectric pressure washers are, in many ways, the best, most convenient choice for many homeowners. SafetyBecause they generally aren’t as powerful, electric pressure washers are generally safer to use than gas pressure washers on a wide variety of surfaces.