Best SIMPSON Pressure Washers with 4.0 GPM in 2026: 5 Picks
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Finding the best SIMPSON pressure washers with 4.0 GPM requires looking at the specs that matter for your workload. We compared 5 models based strictly on published specifications. The Simpson PowerShot 4400 PSI Gas Pressure Washer leads because its 4400 PSI output delivers industrial-grade power for professional deck cleaning. This list helps you decide which unit fits your specific needs, whether you need portability or raw cleaning force. You can trust these picks to match your project demands without guessing.
Quick picks
| # | Product | Best for | Price |
|---|---|---|---|
| 1 | Simpson PowerShot 4400 PSI Gas Pressure Washer Best overall | professional deck cleaning and heavy-duty surface prep | Check price of Simpson PowerShot 4400 PSI Gas Pressure Washer on Amazon |
| 2 | Simpson Aluminum 4200 PSI Honda Gas Pressure Washer Best budget | contractors needing durable aluminum build | Check price of Simpson Aluminum 4200 PSI Honda Gas Pressure Washer on Amazon |
| 3 | Simpson King Brute 4000 PSI 4.0 GPM Gas Washer Best premium | industrial grease and oil removal | Check price of Simpson King Brute 4000 PSI 4.0 GPM Gas Washer on Amazon |
| 4 | Simpson SuperPro Roll-Cage 4400 PSI Pressure Washer Also great | commercial cleaning jobs requiring mobility | Check price of Simpson SuperPro Roll-Cage 4400 PSI Pressure Washer on Amazon |
| 5 | SIMPSON Water Blaster 4200 PSI Gas Also great | contractors needing commercial engine durability | Check price of SIMPSON Water Blaster 4200 PSI Gas on Amazon |
The best fit for you
- You want the most compact model on the list Simpson PowerShot 4400 PSI Gas Pressure Washer It measures 3 inches wide, making it the narrowest unit available.
- You need the lightest pressure washer for mobility Simpson Aluminum 4200 PSI Honda Gas Pressure Washer It weighs 124 pounds, which is the lowest weight in the group.
- You require hot water for industrial grease removal Simpson King Brute 4000 PSI 4.0 GPM Gas Washer It is the only model listed with hot water capability.
- You prioritize the highest pressure output available Simpson PowerShot 4400 PSI Gas Pressure Washer It delivers 4400 PSI, matching the highest pressure rating on the list.
Our 5 picks
Simpson PowerShot 4400 PSI Gas Pressure Washer
Best for: professional deck cleaning and heavy-duty surface prep
- Flow Rate
- 4.0 GPM (what this guide is about)
- Maximum Pressure
- 4400 PSI
- Power Source
- Gas
- Engine Displacement
- 420cc
- Hose Length
- 50 ft
- Nozzle Count
- 5
View on Amazon: Simpson PowerShot 4400 PSI Gas Pressure Washer Affiliate link
The SIMPSON PowerShot delivers 4400 PSI at 4.0 GPM using a CRX 420cc engine. Its AAA industrial triplex plunger pump includes thermal relief and PowerBoost Technology for consistent performance. The welded steel frame supports 13-inch pneumatic tires for easy movement. You get a 50-foot hose and five quick-connect nozzle tips. This setup suits contractors and serious homeowners needing professional-grade power for decks and paint prep.
Pros
- 4400 PSI output at 4.0 GPM for fast cleaning
- AAA industrial triplex plunger pump with thermal relief
- CRX 420cc engine provides reliable starting power
- 50-foot kink-resistant high-pressure hose included
- Five quick-connect nozzle tips for various surfaces
Cons
- 135-pound weight makes it heavy for frequent lifting
- Does not ship to California due to 49-State compliance
- No electric start option listed in specifications
Good fit if
- You need high pressure for tough jobs like deck stripping
- You want a durable steel frame for job site use
- You prefer a long 50-foot hose for reach
Skip if
- You live in California where shipping is restricted
- You need a lightweight unit for easy carrying
- You require electric start for simpler operation
Verdict: SIMPSON PowerShot 4400 PSI Gas Pressure Washer offers industrial-grade durability and strong cleaning power. It fits contractors and serious homeowners who prioritize pump longevity and raw performance over portability.
Simpson Aluminum 4200 PSI Honda Gas Pressure Washer
Best for: contractors needing durable aluminum build
- Flow Rate
- 4.0 GPM (what this guide is about)
- Maximum Pressure
- 4200 PSI
- Power Source
- Gas
- Hose Length
- 50 ft
- Nozzle Count
- 5
- Pump Type
- Triplex plunger
View on Amazon: Simpson Aluminum 4200 PSI Honda Gas Pressure Washer Affiliate link
This Simpson gas pressure washer delivers 4200 PSI and 4.0 GPM for heavy-duty cleaning tasks. It features a Honda GX390 engine and a CAT triplex plunger pump with ceramic pistons. The unit includes a 50-foot hose and pneumatic tires for easy mobility. Its aircraft-grade aluminum frame resists corrosion. This model suits contractors and professionals who need reliable performance and durability for demanding jobs.
Pros
- Honda GX390 engine for easy starts
- CAT triplex plunger pump with ceramic pistons
- 50-foot dual-braided high-pressure hose
- Aircraft-grade aluminum frame resists corrosion
- 13-inch pneumatic tires for smooth rolling
Cons
- 4200 PSI is lower than the 4400 PSI on other list picks
- 133 lb weight is heavier than lighter competitors
- Not for sale in California due to emissions
Good fit if
- You need a durable machine for daily professional use
- You want a Honda engine for reliability
- You prefer a lightweight aluminum frame over steel
Skip if
- You live in California
- You need the highest PSI in this group
- You prefer a hot water unit for grease
Verdict: Simpson Aluminum Series 4200 PSI offers a robust Honda engine and 50-foot hose reach. It fits contractors who prioritize durability and mobility over maximum pressure.
Simpson King Brute 4000 PSI 4.0 GPM Gas Washer
Best for: industrial grease and oil removal
- Flow Rate
- 4.0 GPM (what this guide is about)
- Maximum Pressure
- 4000 PSI
- Power Source
- Gas
- Hose Length
- 50'
- Nozzle Count
- 5
- Pump Type
- triplex plunger
View on Amazon: Simpson King Brute 4000 PSI 4.0 GPM Gas Washer Affiliate link
This is a hot water gas pressure washer designed for tough grease and oil. It delivers 4000 PSI at 4.0 GPM using a Honda GX390 engine. The unit features a triplex plunger pump and a heavy-duty steel frame. It includes a 50 ft hose and four nozzle tips. You should choose this if you need industrial cleaning power for heavy-duty tasks.
Pros
- Honda GX390 direct drive engine for reliable power
- 4000 PSI output at 4.0 GPM flow rate
- Hot water capability for grease and oil removal
- Heavy-duty 1-1/2 inch tubular welded steel frame
Cons
- Significantly heavier than standard cold water models
- Requires diesel fuel for the burner system
- Lacks cold water bypass functionality for general use
Good fit if
- You clean industrial equipment or factory floors
- You need to remove heavy grease and oil stains
- You require hot water for faster cleaning results
Skip if
- You only need to wash cars or decks
- You prefer a lighter unit for easy transport
- You want to use only gasoline for all functions
Verdict: Simpson King Brute 4000 PSI Hot Water is built for industrial environments where grease removal is critical. It suits professionals who prioritize cleaning speed and durability over portability.
Simpson SuperPro Roll-Cage 4400 PSI Pressure Washer
Best for: commercial cleaning jobs requiring mobility
- Flow Rate
- 4.0 GPM (what this guide is about)
- Maximum Pressure
- 4400 PSI
- Power Source
- Gas
- Hose Length
- 50 ft
- Pump Type
- Triplex plunger
- Dimensions
- 38 × 27.5 × 33 inches
View on Amazon: Simpson SuperPro Roll-Cage 4400 PSI Pressure Washer Affiliate link
The SIMPSON SuperPro delivers 4400 PSI and 4.0 GPM via a CRX 420 belt drive engine and triplex plunger pump. Its roll-cage cart design includes 10-inch pneumatic tires and wheel-locking brakes for stable mobility. The unit comes with a 50-foot Monster Series hose and professional gun. This gas-powered washer suits heavy-duty commercial cleaning tasks where durability and high flow matter.
Pros
- 4400 PSI maximum pressure output
- 4.0 GPM flow rate for fast cleaning
- Belt drive CRX 420 engine for durability
- 50-foot high-pressure hose included
- Roll-cage cart with locking brakes
Cons
- Heavy weight limits easy transport
- Large footprint requires storage space
- Gas engine needs maintenance
Good fit if
- You need commercial-grade durability
- You clean large outdoor areas
- You prefer wheeled mobility over carrying
Skip if
- You store equipment in tight spaces
- You want a lightweight portable unit
- You need electric power sources only
Verdict: SIMPSON SuperPro Roll-Cage 4400 PSI is built for professionals who need a heavy-duty, mobile cleaning solution with high flow and pressure. It fits users who prioritize commercial durability and easy transport over compact storage.
SIMPSON Water Blaster 4200 PSI Gas
Best for: contractors needing commercial engine durability
- Flow Rate
- 4.0 GPM (what this guide is about)
- Maximum Pressure
- 4200 PSI
- Power Source
- Gas
- Hose Length
- 50 ft
- Nozzle Count
- 5
- Pump Type
- Triplex plunger
View on Amazon: SIMPSON Water Blaster 4200 PSI Gas Affiliate link
The Simpson Water Blaster delivers 4200 PSI at 4.0 GPM with a Honda GX390 engine. It features a 50-foot hose and five quick-connect nozzle tips for versatile cleaning. The welded steel frame and pneumatic tires aid mobility. This unit suits contractors needing durable, professional-grade equipment for deck cleaning and wood restoration tasks.
Pros
- Honda GX390 commercial series engine for reliable starts
- 50-foot high-pressure hose included
- Five quick-connect nozzle tips (0°, 15°, 25°, 40°, Soap)
- Welded steel frame with powder-coated finish
- 13-inch premium pneumatic tires for terrain maneuverability
Cons
- Heavier at 159 pounds compared to aluminum series models
- Lower pressure output of 4200 PSI versus 4400 PSI competitors
- Does not ship to California
Good fit if
- You need a commercial-grade engine for daily contractor use
- You want a long 50-foot hose to reduce refills
- You work on uneven ground requiring pneumatic tires
Skip if
- You require 4400 PSI or higher pressure
- You live in California due to shipping restrictions
- You prefer a lighter aluminum frame for easy transport
Verdict: SIMPSON Water Blaster 4200 PSI Gas is a robust option for professionals prioritizing engine durability and long hose reach. It fits users who value commercial components over maximum pressure or lightweight portability.
Specifications side by side
| Spec | Simpson PowerShot 4400 PSI Gas Pressure Washer | Simpson Aluminum 4200 PSI Honda Gas Pressure Washer | Simpson King Brute 4000 PSI 4.0 GPM Gas Washer | Simpson SuperPro Roll-Cage 4400 PSI Pressure Washer | SIMPSON Water Blaster 4200 PSI Gas |
|---|---|---|---|---|---|
| Maximum Pressure | 4400 PSI | 4200 PSI | 4000 PSI | 4400 PSI | 4200 PSI |
| Flow Rate | 4.0 GPM | 4.0 GPM | 4.0 GPM | 4.0 GPM | 4.0 GPM |
| Power Source | Gas | Gas | Gas | Gas | Gas |
| Engine Displacement | 420cc | not stated | not stated | not stated | not stated |
| Hose Length | 50 ft | 50 ft | 50' | 50 ft | 50 ft |
| Nozzle Count | 5 | 5 | 5 | not stated | 5 |
| Pump Type | Triplex plunger | Triplex plunger | triplex plunger | Triplex plunger | Triplex plunger |
| Pressure | 4400 PSI | 4200 PSI | 4000 PSI | 4400 PSI | 4200 PSI |
| Water Temperature | not stated | not stated | Hot Water | not stated | not stated |
| Color | Black | Red | Black/Grey | Black/Grey | Black |
| Dimensions | 8 × 3 × 50 inches | 38 × 23.5 × 29 inches | 42 × 28 × 47.5 inches | 38 × 27.5 × 33 inches | 44.3 × 26 × 24.5 inches |
| Weight | 135 pounds | 124 pounds | 375 pounds | 182 pounds | 159 pounds |
| Size | 4400 psi At 4.0 GPM | 4200 PSI @ 4.0 GPM | not stated | not stated | 4200 PSI |
| Model | PS60843 | ALH4240 | KB65133 | SRC4440111 | 60205 |
How to choose the right one
-
Check power source type
All five models on this list run on gas. This means you need to manage fuel storage and engine maintenance. Gas engines provide consistent power for heavy-duty tasks without relying on electrical outlets. You must ensure you have a safe place to store gasoline. If you prefer electric models, this list does not cover them. For these specific units, focus on engine durability and fuel efficiency rather than cord length or battery life. Gas allows for high-pressure performance in remote locations where electricity is unavailable.
-
Match pressure to task
Pressure determines how effectively you strip stubborn grime. The PowerShot and SuperPro deliver 4400 PSI, ideal for tough deck prep and paint removal. The Aluminum and Water Blaster offer 4200 PSI, which is sufficient for general cleaning. The King Brute provides 4000 PSI, optimized for industrial grease. Higher PSI does not always mean better for delicate surfaces. You should select the lowest PSI that handles your toughest job to prevent damage. Compare these values against the material you plan to clean.
-
Use flow rate for speed
All units here share a 4.0 GPM flow rate. This consistent water volume ensures fast rinsing and efficient cleaning across the board. Flow rate removes dirt faster than pressure alone. Since every model offers this same gallon-per-minute output, you do not need to compare this spec between them. Instead, focus on how the machine delivers that water. A steady 4.0 GPM means you spend less time scrubbing. This spec is constant for all five picks, so it is not a differentiator for choice.
-
Consider weight for mobility
Weight affects how easily you move the unit. The Aluminum model weighs 124 pounds, making it the lightest and most portable option. The King Brute is the heaviest at 375 pounds, requiring a cart or two people. The PowerShot weighs 135 pounds, while the SuperPro is 182 pounds. If you need to carry the washer up stairs or load it frequently, choose the lighter unit. Heavy units are stable but difficult to transport. Check the weight spec to match your physical ability and transport needs.
-
Evaluate water temperature needs
Most models use cold water, but the King Brute is a hot water washer. Hot water dissolves grease and oil much faster than cold water. If you clean vehicles, machinery, or industrial floors, the King Brute is the only choice here. For decks, driveways, and siding, cold water is sufficient and simpler to maintain. Hot water systems require more upkeep and safety precautions. You must decide if your primary job involves heavy grease. If not, stick with the standard cold water gas models.
Frequently asked questions
Which SIMPSON pressure washer with 4.0 GPM is the lightest?
The Simpson Aluminum 4200 PSI Honda Gas Pressure Washer is the lightest option. It weighs 124 pounds, which is significantly less than the heaviest model. This lower weight makes it easier for contractors to move around job sites. Its aluminum build also contributes to its durability while keeping the overall mass down for better mobility.
What is the narrowest SIMPSON pressure washer with 4.0 GPM?
The Simpson PowerShot 4400 PSI Gas Pressure Washer is the narrowest unit. It measures only 3 inches in width. This slim profile allows it to fit into tight storage spaces or transport slots where other wide units would not. It combines this compact width with a substantial 4400 PSI output for heavy cleaning tasks.
Does any SIMPSON 4.0 GPM model use hot water?
Yes, the Simpson King Brute 4000 PSI 4.0 GPM Gas Washer uses hot water. This feature is critical for professionals who need to remove industrial grease and oil quickly. The hot water capability allows for faster cleaning speeds and better results on tough contaminants compared to standard cold water units. It is built for industrial environments.
Which SIMPSON pressure washer is the heaviest?
The Simpson King Brute 4000 PSI 4.0 GPM Gas Washer is the heaviest. It weighs 375 pounds, which is much heavier than the other models. This significant weight reflects its industrial-grade construction designed for durability in harsh environments. You should consider this mass when planning transport, as it is not intended for frequent manual moving.
What is the highest PSI available in this group?
The highest PSI available is 4400, found in two models. The Simpson PowerShot and the Simpson SuperPro Roll-Cage both deliver 4400 PSI at 4.0 GPM. This higher pressure is suitable for professional deck cleaning and heavy-duty surface prep. It provides the raw power needed to strip away tough grime and prepare surfaces effectively.
Which model is best for industrial grease removal?
The Simpson King Brute 4000 PSI 4.0 GPM Gas Washer is best for this task. It is specifically built for industrial environments where grease removal is critical. The combination of 4000 PSI and hot water allows you to break down stubborn oil and grease efficiently. It suits professionals who prioritize cleaning speed and durability over portability.