A pressure washer (PW) pumps water at high pressure through a hose and nozzle to clean vari­ous hard surfaces. Consumer PWs come in a variety of sizes and can be had as cordless, elec­tric and gas models. They’re rated by the water pressure they deliver, measured in pounds per square inch (PSI). Gas-powered PWs deliver between 2,500 and 4,000+ PSI, making them ideal for cleaning concrete, stripping paint and tackling large surfaces. However, they’re heavy and noisy. Electric PWs are lighter and quieter, typically delivering between 1,500 and 2,500 PSI. They’re well-suited for a range of domestic cleaning jobs includ­ing decks, driveways, siding and vehicles. Battery-powered PWs are more portable and conve­nient, usually delivering under 1,000 PSI. They’re best for clean­ing cars and patio furniture and accomplishing other small household tasks. A fully charged battery typically lasts 15 to 40 minutes, depending on the bat­tery amp-hour rating and the washer’s PSI setting. In addi­tion to water pressure, PWs are rated by water flow, measured in gallons per minute (GPM). A higher GPM allows a PW to clean a larger surface area more quickly and efficiently. Some PWs feature quick-connect noz­zles that provide different spray patterns, while others come with turbo nozzles for increased cleaning power. Certain models can draw water from a bucket or other water source, while oth­ers require a hose connection. Many models feature onboard detergent tanks to enhance cleaning power.