Picked from manufacturer specs and manuals; we haven't tested these units.
Gas pressure washers suit large outdoor surfaces such as driveways, siding and fences, away from an outlet. Run them outdoors only, away from windows, doors and vents. Follow the manual for fuel, oil and storage.
Gas picks
Engines are named as each manufacturer states them.
Basis as the maker states it: PSI "Pressure rating"; GPM "Flow rating". Cleaning units (PSI × GPM) are our arithmetic, shown only where both figures share a basis.
Power
Gas
Engine and pump
Honda GX200; AAA Triplex pump
Hose
25 ft (5/16 in. M22 MorFlex)
Warranty
3 yr engine / 5 yr pump / 10 yr frame / 90 day accessories (limited commercial)
Who it suits Large driveways, walkways and siding outdoors, away from an outlet.
Trade-off It lists the highest pressure of the gas picks here. Simpson's FAQ says household jobs "shouldn't need a machine larger than 3000 PSI", so check you need this much.
Westinghouse WPX3200 Gas Pressure Washer, 3,200 PSI / 2.5 GPM as listed (manufacturer)
Gas, for driveways, siding and fences
PSI3,200
GPM2.5
CU8,000 as listed
Basis as the maker states it: PSI as listed; GPM as listed. Cleaning units (PSI × GPM) are our arithmetic, shown only where both figures share a basis.
Westinghouse WPX3400 Gas Pressure Washer, 3,400 PSI / 2.6 GPM as listed (manufacturer)
Gas, for large driveways and siding
PSI3,400
GPM2.6
CU8,840 as listed
Basis as the maker states it: PSI as listed; GPM as listed. Cleaning units (PSI × GPM) are our arithmetic, shown only where both figures share a basis.
Trade-off Westinghouse doesn't say whether these are max or rated figures. It also lists more than the 3,000 PSI that Simpson's FAQ calls enough for household jobs.
Generac G0088740 Gas Pressure Washer, 2,900 max PSI / 2.4 max GPM (manufacturer)
Gas under 3,000 PSI, for driveways, patios and siding
PSI2,900 max
GPM2.4 max
CU6,960 max
Basis as the maker states it: PSI "Max Outlet Pressure"; GPM "Max Flow Rate". Cleaning units (PSI × GPM) are our arithmetic, shown only where both figures share a basis.
Power
Gas
Engine and pump
196 cc 4-cycle OHV; recoil pull start
Hose
25 ft (1/4 in.; hose rated 3100 psi)
Warranty
2 Year Limited
Who it suits Driveways, patios and siding outdoors, if you want to stay under 3,000 PSI.
Trade-off Pull start only, and Generac lists no 15° tip in the box.
Champion 100783 Gas Pressure Washer, 3,200 max PSI / 2.5 max GPM, Honda GC190 (manufacturer manual)
Gas, for driveways, siding and fences
PSI3,200 max
GPM2.5 max
CU8,000 max
Basis as the maker states it: PSI "Max Pressure" (manual); GPM "Max Volume" (manual). Cleaning units (PSI × GPM) are our arithmetic, shown only where both figures share a basis.
Power
Gas
Engine and pump
Honda GC190, 187cc (manual parts list: 'GC190 Engine, 187cc')
Hose
25 ft (manual parts list: 'High pressure hose, 25ft.')
Warranty
2 year limited (manual)
Who it suits Driveways, siding and fences outdoors.
Trade-off Champion's manual says thicker detergents like dish soap will clog the chemical injection system, so plan on a detergent labeled for pressure washers.
A gas washer needs no outlet, and the picks here list more flow than the electric ones (2.4 to 2.6 GPM, on each maker's basis). That suits big, open surfaces outdoors. It also means fuel, oil and engine upkeep. Use the lowest pressure that does the job. Weighing it up? Read the gas vs electric trade-offs.
Outdoors only
Fuel, oil and storage
Follow the manual for fuel, oil and storage. We don't give our own fuel, oil or storage steps.
Yes. Follow the manual for fuel, oil and storage. Your washer's manual sets the schedule; we don't give intervals of our own.
Gas or electric: which should I get?
Gas suits big outdoor surfaces away from an outlet; electric suits cars, decks and patios near one. See gas vs electric trade-offs.
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