Product Review: Simpson Cleaning 4200 PSI Gas Pressure Washer, 4.0 GPM Power Washer for Commercial Use, Honda GX390 Engine, 50-Foot Steel-Braided Hose, Aluminum Series, 49-State (ALH4240)
Introduction
If you’re a contractor or serious DIYer looking to buy Simpson ALH4240 or want the best commercial cleaning performance, this review covers everything you need. The Simpson Cleaning pressure washer ALH4240 promises robust power, portability, and professional-grade components—making it a top contender among 4200 PSI pressure washer models. Below you’ll find an honest, practical review, helpful comparisons, and tips for where to find the best deal.
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What is this product?
The Simpson Cleaning 4200 PSI Gas Pressure Washer ALH4240 is a commercial-grade, Honda GX390 pressure washer in the Aluminum Series. Rated at 4200 PSI pressure washer output and 4.0 GPM power washer flow, it’s designed for demanding jobs like deck cleaning, wood restoration, paint prep, and fleet maintenance. This 49-state compliant unit features a lightweight aircraft-grade aluminum frame, a CAT triplex pump, and a 50-foot steel-braided hose, making it a reliable professional pressure washer for contractors.
Key Features
- Professional Performance: HONDA GX390 commercial series engine—easy to assemble and start.
- Power and Durability: CAT Industrial triplex plunger pump delivering 4200 PSI at 4.0 GPM with thermal relief.
- Sturdy and Portable: Aircraft-grade aluminum frame with brushed extruded tubing and 13-inch pneumatic tires.
- Quality Accessories: Monster 3/8″ x 50-foot high-pressure hose (kink- and abrasion-resistant), five quick-connect nozzles (0°, 15°, 25°, 40°, Soap), 16″ steel wand, professional spray gun with safety lock-out.
- Important Notes: 49-State compliant; Pump/Hose connection uses threaded M22 connection.
Why these features matter
For professionals the combination of Honda GX390 reliability, a triplex pump, and a lightweight aluminum frame means fewer breakdowns and less strain while transporting to job sites. The included 50-foot steel-braided hose is ideal for wide coverage without needing to constantly move the washer.
Detailed Description
The SIMPSON Aluminum Series pressure washer delivers a carefully balanced mix of mobility and commercial strength. The HONDA GX390 engine provides consistent, manageable power while the CAT triplex pump is known for long service life and steady pressure under load. The ALH4240’s aircraft-grade aluminum frame makes it significantly lighter than steel-frame competitors without sacrificing durability. That makes this model particularly attractive when comparing professional pressure washers for deck cleaning, graffiti removal, and equipment maintenance.
This model arrives with everything a contractor needs to get started: hose, gun, wand, 5 quick-connect nozzle tips, detergent siphon tube, engine oil, and clear setup instructions. Simpson backs the unit with solid warranties: 10-year limited frame, 5-year limited pump, and 3-year limited engine warranty.
Pros and Cons
Pros
- Powerful output: 4200 PSI and 4.0 GPM—excellent for heavy-duty cleaning.
- Durable pump & engine: CAT triplex pump with Honda GX390 engine.
- Lightweight frame: 100% aircraft-grade aluminum for corrosion resistance and easier transport.
- Long hose: 50-foot steel-braided hose reduces the need to reposition the unit often.
- Commercial accessories: Professional spray gun, wand, and nozzle set included.
Cons
- Price: As a commercial pressure washer, initial Simpson Cleaning pressure washer price is higher than consumer models (consider this an investment).
- Weight: Although aluminum minimizes weight, the engine and pump still make it a heavy unit relative to consumer electric washers.
- Fuel/maintenance: Being a gas pressure washer, it requires regular engine maintenance and proper winter storage.
Who Should Buy This Product
This unit is ideal if you are a contractor or facilities manager who needs a commercial pressure washer that will stand up to regular, heavy use. It’s perfect for professionals seeking a professional contractor pressure washer 4200 psi 4 gpm and for those who prioritize durability, portability, and reliable components like Honda and CAT.
If you are wondering where to buy power washer ALH4240 or looking for the best deal Simpson pressure washer, this model is a solid choice. For casual homeowners with occasional light cleaning needs, a lower-powered electric model may be more economical.
Comparison with Similar Products
Compared to other 4200 PSI pressure washers, the ALH4240 stands out due to its aluminum frame and Honda engine. Many competitors use steel frames which increase weight and risk corrosion. The CAT triplex pump is also a step up from cheaper axial cam pumps found on lower-cost units.
If comparing to electric models or lower PSI gas washers, remember the ALH4240 is designed for contractors—its power and flow rate (4.0 GPM power washer) mean faster cleaning on tough jobs. For those seeking a Simpson 4200 psi 4.0 gpm Honda GX390 commercial power washer ALH4240 review or looking specifically for an aluminum frame 4200 psi pressure washer with 50 ft steel braided hose, this model checks all the boxes.
Frequently Asked Questions
Is the Simpson ALH4240 49-state compliant?
Yes. The product is listed as 49-State compliant.
What maintenance is required?
Regular oil changes for the Honda GX390 engine, pump oil checks, winterization, and inspecting the hose and nozzles are the primary tasks. See the owner’s manual for Simpson ALH4240 maintenance tips and accessories for recommended intervals.
Where can I purchase this unit?
You can purchase the Simpson ALH4240 from authorized retailers and online marketplaces. To purchase commercial pressure washer units and find deals, check the product link below.
Final Verdict
The Simpson Cleaning 4200 PSI Gas Pressure Washer (ALH4240) is a dependable, high-performance commercial pressure washer built for professionals. With a Honda GX390 engine, CAT triplex pump, and aircraft-grade aluminum frame, it offers a compelling mix of power, longevity, and portability. If you want to buy Simpson ALH4240 for demanding cleaning tasks or are looking for a heavy duty power washer for commercial cleaning with Honda GX390, this model is one of the best choices on the market.
For price checks, availability, and to secure the best deal Simpson pressure washer offers, click below to view the product on Amazon.