Pressure washers: PSI sells them, GPM cleans, and electric is enough for most driveways

How to read PSI and GPM together, when gas is actually needed, the nozzle and hose details that matter, and what to never spray.

Cleaning power is pressure times flow. The PSI number on the box is the sales figure; gallons per minute is what rinses the dirt away. Compare both.

Electric or gas

• Electric (1,500–2,300 PSI, 1.2–1.8 GPM): cars, decks, patio furniture, siding, a driveway with patience. Quiet, light, no fuel, starts every time. Right for most homes.
• Gas (2,500–3,500 PSI, 2.3–3 GPM): large driveways, paint stripping, second-story siding, concrete regularly. Loud, heavy, needs maintenance and fuel storage.

What to check

• Pump type: axial pumps are standard on consumer units; triplex pumps on better gas machines last far longer.
• Hose: 25 ft is short; 35–50 ft saves dragging the machine. Check whether the fittings are standard (M22) so you can replace it.
• Nozzles: 15°, 25°, 40° and soap; a turbo (rotary) nozzle doubles effective cleaning on concrete. A 0° nozzle is an injury tool; skip it.
• Surface cleaner attachment for driveways and decks — the accessory that changes the job most.
• Onboard detergent tank and whether it draws downstream (it should).
• Cord length and GFCI plug on electrics; wheel size on gas.

Never spray

Windows at high pressure, soft wood at close range, roof shingles, electrical boxes, or people and pets. Keep the wand moving and start with the widest nozzle.

Timing

Spring is peak demand and full price; late summer and fall clearances are the time. Refurbished units from the maker are common and sound in this category.

Today's prices

Every seller we found, ranked by total price: pressure washer.

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