Simpson Pressure Washers: Which Model Matches Your Cleaning Jobs?

Best for
Homeowners tackling routine seasonal outdoor cleaning

The Simpson Clean Machine 3400 PSI Gas pressure washer is designed specifically for homeowners tackling seasonal chores around patios, driveways, and fences. Powered by a 208 cc CRX engine equipped with low-oil shutdown, the machine generates 3400 PSI at 2.5 GPM. This combination provides ample force to sweep oil stains from concrete, strip grime from brick walkways, and freshen outdoor furniture. Unlike entry-level electric machines such as a sun joe electric pressure washer, this cold-water gas unit delivers the water volume necessary to push accumulated dirt across wide flat surfaces without slowing down.

At the center of the Simpson Clean Machine CM61083 is a maintenance-free OEM Technologies axial cam pump with a thermal relief valve to prevent overheating. The assembly sits in a powder-coated welded steel frame riding on 10-inch pneumatic tires for smooth rolling over grass and curbs. It includes an ergonomic front-load M22 spray gun, a 16-inch steel wand, and four quick-connect tips. This model serves as an ideal homeowner workhorse, but it yields to the heavier PowerShot series when tasks demand all-day continuous contractor duty cycles.

• 208 cc CRX gas engine with low-oil shutdown sensor for reliable starting.
• Maintenance-free OEM Technologies axial cam pump providing 3400 PSI at 2.5 GPM.
• MorFlex 25-foot non-marring high-pressure hose with quick-connect fittings.
• Four quick-connect spray nozzles covering 0, 15, 40 degrees, and soap.

Best for
Contractors stripping paint and heavy industrial grime

Contractors, wood restoration specialists, and facility maintenance crews needing immense cleaning force will find the Simpson PowerShot 4400 PSI Gas Pressure washer built for heavy-duty tasks. Driven by a large CRX 420cc commercial engine, this machine unleashes an aggressive 4400 PSI alongside a generous flow rate of 4.0 GPM. That output enables operators to strip peeling paint, restore weathered decks down to fresh grain, and scour years of embedded grease from industrial workshop slabs in fewer passes.

Simpson equips the Simpson PowerShot PS60843 with a heavy-duty AAA industrial triplex plunger pump featuring PowerBoost Technology to maximize nozzle pressure. The welded steel frame with a powder-coated finish protects internal components against jobsite impacts, supported by 13-inch pneumatic tires that handle rough grading. It includes a 50-foot Monster 3/8-inch high-pressure hose with a polyurethane jacket, an ergonomic spray gun, a 31-inch lance, and five quick-connect nozzles. Its 61.23 kg weight and high flow rate make it excessive for simple residential washing, where smaller 2.5 GPM machines are far easier to transport.

• CRX 420cc commercial engine designed for smooth pull starts and high output.
• AAA industrial triplex plunger pump delivering 4400 PSI at 4.0 GPM.
• Monster 50-foot 3/8-inch high-pressure hose with kink-resistant jacket.
• Five quick-connect nozzles including 0, 15, 25, 40 degrees, and soap.

Best for
Contractors wanting compact Honda GX engine reliability

The Simpson PowerShot 3500 PSI Gas Pressure washer bridges the gap between residential maneuverability and professional endurance. Listed as the Simpson PowerShot PS61002-S, it features a commercial Honda GX200 engine recognized across industries for easy pull starts, fuel economy, and reliable low-oil shutdown protection. Supplying 3300 to 3500 PSI at 2.5 GPM, this machine gives painting contractors and dedicated property owners commercial-grade components in a balanced 72.8-pound steel chassis.

Unlike residential axial machines, this PowerShot incorporates an industrial AAA triplex pump with an integrated unloader and thermal relief protection. The triplex design withstands daily use for washing brick, clearing graffiti, and prepping painted siding. A powder-coated steel frame rests on 10-inch pneumatic tires for steady transport across grass and gravel. It comes equipped with a 25-foot MorFlex hose, a rear-load spray gun, a 16-inch wand, and five quick-connect nozzles. It provides an exceptional balance of power and portability, but hands off to larger 3.5 or 4.0 GPM machines when sweeping massive parking lots.

• Commercial Honda GX200 engine with integrated low-oil shutdown protection.
• AAA commercial triplex pump featuring an integrated unloader and thermal relief.
• MorFlex 25-foot non-marring high-pressure hose with threaded M22 connections.
• Five quick-connect spray tips spanning 0, 15, 25, 40 degrees, and soap.

Best for
Jobsite crews cleaning commercial equipment and flatwork

For contractors who require both heavy stripping force and high water volume driven by Honda power, the Simpson Cleaning PS60869 PowerShot 4000 PSI pressure washer serves as a premier commercial solution. Powered by a Honda GX270 engine, the Simpson PowerShot PS60869 generates 4000 PSI at 3.5 GPM. That elevated flow rate is crucial for washing speed, as higher water volume rapidly pushes away stripped paint chips, concrete slurry, and dislodged dirt across wide expanses of pavement.

The mechanical assembly relies on a direct-drive AAA industrial triplex plunger pump equipped with thermal relief and PowerBoost Technology. A heavy-gauge welded steel frame protects the engine and pump, riding on 13-inch pneumatic tires that conquer uneven jobsite ground. Weighing 120 pounds, the machine includes an ergonomic spray gun, a 31-inch lance, five quick-connect nozzles, and a 50-foot Monster 3/8-inch high-pressure hose. This model is engineered for demanding jobsite work, handing off only to aluminum models when rust immunity in humid marine air is an absolute priority.

• Honda GX270 commercial engine engineered for long-duration jobsite duty.
• AAA industrial triplex plunger pump outputting 4000 PSI at 3.5 GPM.
• Monster 50-foot 3/8-inch abrasion-resistant hose with quick-connect fittings.
• Heavy-duty welded steel frame riding on 13-inch pneumatic tires.

Best for
Industrial fleet washers needing maximum flow rate

Best for
Marine detailers and coastal facility managers

Working near swimming pools, marinas, or coastal properties exposes painted steel frames to constant corrosion. The Simpson Aluminum Series 3600 PSI Gas pressure washer solves this issue by mounting its running gear to a frame crafted from 100 percent aircraft-grade extruded aluminum. Weighing 78 pounds, the Simpson Aluminum Series ALH3425 offers mobile contractors and estate managers professional durability in a lightweight chassis that will never rust or corrode from harsh water or chemical exposure.

Performance is driven by a commercial Honda GX200 engine paired with an industrial AAA triplex plunger pump producing 3600 PSI at 2.5 GPM. The pump features an integrated unloader and PowerBoost technology for consistent pressure across long sessions. Ten-inch pneumatic tires make the unit easy to guide over gravel or roll into transport vans. The package includes a 35-foot MorFlex non-marring hose, a professional spray gun with safety lock-out, a 16-inch wand, and five quick-connect nozzles. While ideal for mobile detailers and property maintenance, larger commercial wash jobs will benefit from the higher water volume of the 4200 PSI Aluminum model.

• Aircraft-grade aluminum frame eliminates rust and minimizes transport weight.
• Honda GX200 engine paired with a commercial AAA triplex plunger pump.
• Outputs 3600 PSI at 2.5 GPM with PowerBoost technology for nozzle pressure.
• Extended 35-foot MorFlex non-marring high-pressure hose with M22 fittings.

At the top of the brand’s portable gas lineup, the Simpson Aluminum Series 4200 PSI Gas pressure washer is engineered for demanding construction cleanup, fleet maintenance, and facility management. The Simpson Aluminum Series ALH4240 combines a powerful Honda GX390 commercial engine with an industrial CAT triplex plunger pump. CAT pumps are renowned throughout the pressure-washing industry for exceptional endurance, featuring ceramic-coated pistons and advanced oil seals that extend operational life during continuous, high-hour commercial shifts.

Delivering 4200 PSI at 4.0 GPM, this machine produces an immense cleaning factor to blast away grease, heavy equipment grime, and stubborn graffiti. Despite its 389 cc engine and brass pump, the aircraft-grade aluminum frame keeps the machine balanced and durable at 133 pounds without risk of frame corrosion. It features 13-inch pneumatic tires, a 50-foot Monster dual-braided non-marring hose, an ergonomic spray gun with safety lock-out, and five quick-connect nozzles. Due to its intense power and 4.0 GPM water appetite, it is tailored strictly for commercial operations rather than light home chores.

• Commercial Honda GX390 gas engine with low-oil shutdown protection.
• Industrial CAT triplex plunger pump delivering 4200 PSI at 4.0 GPM.
• Corrosion-proof aircraft-grade aluminum frame with 13-inch pneumatic tires.
• Monster 50-foot dual-braided non-marring high-pressure hose for wide reach.