Diesel vs Gas Pressure Washer: Which One Should You Buy?

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Diesel vs gas pressure washer: the direct answer

Diesel and gas pressure washers differ first in fuel: a diesel machine runs on diesel fuel, and a gas machine runs on gasoline. That fuel difference sets what to keep on hand, which engine type the listing names and which compliance statements the listing carries. All four machines featured below are gas-powered, so this guide states gas figures only. No diesel PSI, GPM, engine or hose figure is stated here, because no diesel listing is included. A buyer weighing diesel against these gas machines should compare the diesel candidate’s own listing line by line: fuel type, engine size, PSI, GPM, hose length, nozzle set, wheels, stated compliance and warranty terms.

See the electric vs gas pressure washer comparison for the electric side of the same choice.

The four gas machines, ranked

Machine	PSI	GPM	Engine	Hose	Nozzles	Weight
IvyBess 4200	4200 PSI	4 GPM	212CC, 7HP	25 feet	0, 15, 25, 40 degrees and soap	66 pounds
SIMPSON CM61083	3400 PSI	2.5 GPM	208 cc CRX	25 feet	0, 15, 40 degrees and soap	64 lb
SIMPSON CM61456	3200 PSI	2.5 GPM	174 cc	25 feet	0, 15, 40 degrees and soap	50 lb
Ezasin EAPW01	3500 PSI	2.3 GPM	212CC, 7HP	25 feet	0, 25, 40 degrees and soap	63 pounds

The IvyBess machine tops the ranking on stated cleaning figures: 4200 PSI and 4 GPM from a 212CC 7HP engine at 3600RPM, with a 25-foot hose, 9-inch wheels, five nozzles at 0, 15, 25, 40 degrees and soap, a 1000ML foam bottle and a safety lock on the trigger. Its listing states EPA, CARB and ETL compliance and an IPX5 motor, and it states no warranty term. The missing warranty term is the main gap on an otherwise full listing.

The SIMPSON CM61083 comes next: 3400 PSI and 2.5 GPM from a 208 cc CRX engine with low-oil shutdown, an axial cam pump with a thermal relief valve, a 25-foot MorFlex hose, 10-inch pneumatic tires and a welded steel frame with a powder-coated finish. Its warranty states 2 year engine, 1 year pump and 1 year frame coverage. Two contradictions sit inside this listing and are worth noting: the bullets state 64 lb while the spec table states 61 pounds, and the title names 5 nozzles while the bullets name four quick-connect tips at 0, 15, 40 degrees and soap. The bullets are trusted over the spec table for weight, and both nozzle counts are stated here as listed.

The SIMPSON CM61456 follows with 3200 PSI and 2.5 GPM from a 174 cc engine with low-oil shutdown, an axial cam pump with a thermal relief valve, a built-in soap tank, a turbo nozzle, a 25-foot hose, 12-inch never-flat wheels and a 16-inch spray wand. Its warranty is the broadest here, stating a 2-year limited engine warranty, a 1-year limited pump warranty, a 5-year limited frame warranty and a 90-day limited accessory warranty, and its listing states EPA compliance. One contradiction appears: the title, bullets and maximum pressure state 3200 PSI, while one spec table row states 3400 PSI. The title and bullets are trusted, so 3200 PSI is the figure used here.

The Ezasin EAPW01 closes the ranking: 3500 PSI and 2.3 GPM from a 212CC 7HP 4-stroke OHV gasoline engine with recoil start and an axial cam pump, a soap tank, four nozzles at 0, 25, 40 degrees and soap, 10-inch tires and dual front rubber pads. Its listing names SAE 10W-30 oil and 87 octane or higher gasoline, with 0.5L oil added initially, and states a 1 year warranty. Its spec table states a hose length of 300 inches while the title and bullets state a 25-foot hose, and both figures are stated here as listed. It states no compliance certification, which leaves it behind the SIMPSON CM61456 on warranty breadth and stated compliance even though its PSI is higher.

What to check on a diesel listing

A diesel listing should be read the same way as the gas listings above. Check the fuel type first, then the engine size and type, then PSI and GPM, then hose length, nozzle set, wheel size, stated compliance and warranty terms. If any of those facts is missing from the diesel listing, that gap counts against it in the same way the missing warranty term counts against the IvyBess listing and the missing compliance statement counts against the Ezasin listing. Fuel storage matters too: gasoline and diesel need separate handling, so a property that already stores gasoline for other engines has one less fuel to manage by choosing gas.

Hoses, nozzles and wheels

All four featured machines state a 25-foot hose, so reach does not separate them, though the Ezasin spec table states its hose as 300 inches. Nozzle sets differ: the IvyBess set covers 0, 15, 25, 40 degrees and soap, the SIMPSON sets cover 0, 15, 40 degrees and soap, and the Ezasin set covers 0, 25, 40 degrees and soap. The SIMPSON CM61456 adds a turbo nozzle and a built-in soap tank, the Ezasin adds a soap tank, and the IvyBess adds a 1000ML foam bottle. Wheels differ as well: 9-inch wheels on the IvyBess, 10-inch pneumatic tires on the SIMPSON CM61083, 10-inch tires on the Ezasin, and 12-inch never-flat wheels on the SIMPSON CM61456. Both SIMPSON listings state a 16-inch spray wand and a welded steel frame, and the SIMPSON CM61083 states a tank volume of 2.5 gallons.

Safety

Never point a pressure washer at people or animals, and keep children, pets and bystanders away from the work area. Gas pressure washers run outdoors only, never in a closed garage or shed. Refuel only with the engine off and cool, and follow the listing for oil and fuel: the Ezasin listing names SAE 10W-30 oil and 87 octane or higher gasoline. The IvyBess listing states a safety lock on the trigger to guard against accidental triggering. Wear eye protection, clear debris from the surface before washing, and check the manual for the nozzle angle suited to each surface.

FAQ: mowing large lots

Is there a diesel pressure washer among the featured machines?

No. All four featured machines are gas-powered, and no diesel washer is featured in this guide. The diesel side of the comparison is covered by what to check on a diesel listing, not by a featured diesel machine.

Which featured washer has the highest stated PSI and GPM?

The IvyBess machine, at 4200 PSI and 4 GPM from a 212CC 7HP engine, with a 25-foot hose, five nozzles and a 1000ML foam bottle.

What fuel and oil does the Ezasin listing name?

87 octane or higher gasoline and SAE 10W-30 oil, with 0.5L oil added initially. The listing also notes that a minor gasoline odor may remain from factory checks.

Do the SIMPSON listings state the same warranty?

No. The SIMPSON CM61083 states 2 year engine, 1 year pump and 1 year frame coverage, while the SIMPSON CM61456 states a 2-year limited engine warranty, a 1-year limited pump warranty, a 5-year limited frame warranty and a 90-day limited accessory warranty.

Can a gas pressure washer be used indoors?

No. Gas pressure washers run outdoors only. Refuel only with the engine off and cool, never point the spray at people or animals, and keep bystanders away from the work area.

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