Simpson PS4240 - 4200 PSI 4 GPM Gas Pressure Washer With Honda Engine
The Simpson PowerShot PS4240 is a gas-powered pressure washer offering a maximum water pressure of 4200 PSI and flow of 4 GPM. (Read full specs)
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Description
Built for cleaning professionals, the SIMPSON PowerShot 4200 PSI @ 4.0 GPM is built to perform. With a powerful Honda engine, reliable triplex pump and welded steel frame construction, this gas pressure washer is great for construction, equipment upkeep, facility & fleet maintenance cleaning.
Zoom on the Simpson PS4240
In summary, the Simpson PS4240 is a heavy duty, commercial pressure washer, that offers an all-around versatile cleaning experience, and also:
- focused spot cleaning on hard, unpainted surfaces, accessing high spots, and efficiently eliminating stubborn stains
- complete cleaning of hard surfaces, vehicle washing, and surface prep for painting
- mild cleaning for delicate surfaces, and low-pressure cleaning for broader areas
- using cleaning solutions, and rinsing surfaces to remove residue
Ahead are presented its power characteristics and design, its main features and any other additional features.
Power
The Simpson PS4240's triplex pump, powered by an impressive 389cc (11.7 hp) engine, can provide a pressure of up to 4200 PSI (approximately 70 times more than a standard garden hose) and a flow of up to 4 GPM (CETA-certified values). Thus, the Simpson PS4240 achieves a cleaning power of 16800 Cleaning Units.
Starting the Honda GX390 engine of this gas pressure washer involves using a conventional pull-start method.
Fuel for the pressure washer is housed in a steel tank capable of holding up to 1.6 gallon of gasoline.
Design & Handling
Featuring a wheelbarrow design, the Simpson PS4240 prioritizes maneuverability and stability, ensuring smooth handling and reliable functionality in demanding cleaning applications. Guaranteeing longevity, the robust welded steel frame offers stability and protects internal components, even when subjected to demanding tasks. The handle adds to the PS4240 convenience of transport.
With its hefty 136 lbs, this unit isn't exactly easy to handle, making manual lifting and transport quite a daunting task, especially on uneven terrain. Its 389cc Honda GX390 engine, the triplex pump and welded steel frame are mainly responsible for its heavy weight. Nevertheless, with its two 13" pneumatic wheels, users can manage the PS4240 with less difficulty, even over uneven terrain.
Main Features
The Simpson PS4240 comes with a spray gun, a wand, a pressure hose, 5 nozzles and a detergent injection feature, which are detailed below.
- Soap injection: While the device doesn't feature a soap tank, detergent supply is ensured by a siphon hose. The detergent is automatically mixed with the water flow by the pressure washer when a soap nozzle is connected.
- Pressure hose: With a set of convenient hooks, the unit provides a convenient way to store the included 50 ft ⌀3/8" high-pressure hose when not in use, keeping it organized and readily accessible.
- Spray gun and wand: A side hook allows for an easy storage of the included classic ergonomic spray gun and its steel wand.
- Nozzles: In the table below, you can see the 5 included nozzles alongside their respective recommended surface uses.
0° | 15° | 25° | 40° | Soap | |
|---|---|---|---|---|---|
| Concrete, brick, masonry | |||||
| Siding, gutters, house | |||||
| Fencing, deck, patio | |||||
| Lawn equipment, boat, RV |
Note: The shape of the nozzles above is for illustration purposes only and may differ.
Not recommended. Suitable. Use with caution.
Other Features
- Onboard storage: The Simpson PS4240 allows you to be always fully prepared, as it features a handy storage area, where nozzles and accessories can be stored.
- Safety: Safety of operation is enhanced by a low oil protection, a trigger lock mechanism (which prevents accidental operation) and a thermal relief valve (which helps to prevent internal pump damage).
- Accessories: Besides the usual owner's manual (opens in a new tab) and documentation to get you promptly started, the Simpson PS4240 comes with oil, soap hose, wand, spray gun and pressure hose.
Product Videos
The Simpson PS4240's performance versus other pressure washers
The following charts are provided to give you an idea of how the key specs of the Simpson PS4240 compare to similarly priced pressure washers.
- With a maximum pressure of 4200 PSI, the Simpson PS4240 is among the gas-powered options offering above-average water pressure, in the $1000 to $1300 price bracket. If you're going after the highest possible power of the water stream, one of the best in this price range is the DeWalt DXPW4440 that can reach up to 4400 PSI.
- The water flow of this washer, which reaches up to 4 GPM (gallons per minute) is one of the highest values found in the above-mentioned price range.
- Reaching up to 16800 Cleaning Units (PSI X GPM), the PS4240 is one of the more efficient amongst its similarly priced peers. If the highest overall cleaning power is a priority, the DeWalt DXPW4440 and its 17600 Cleaning Units are notable for their higher potential cleaning efficiency compared to units in the same price range.
Price comparison
As you can see from these interactive charts, when compared to other gas-powered washers between 16500 and 17000 Cleaning Units, the Simpson PS4240 is on the average side of the price range.
Therefore, this pressure washer nicely fits in the expected budget for this kind of cleaning power.
The bottom line
- In the expected price range
- 10 year (limited) warranty
- Triplex pump
- Honda engine
- Designed to be stable
- Good range of nozzles included
- Onboard storage
- Several security features
- High PSI for the price
- High GPM for the price
- High CU for the price
- No soap tank
Features and Specifications
| Fuel | Gas-Powered |
|---|---|
| Engine | 389cc 11.7 HP Honda GX390 OHV 4-stroke |
| Pump | AAA Triplex |
| Water | Cold (100°F max.) |
| PSI | 4200 |
| GPM | 4 |
| Cleaning Units | 16800 |
| Pressure control | Valve |
| Frame | Welded steel |
|---|---|
| Handling | Wheelbarrow |
| Wheels | 2 wheels, ⌀13", pneumatic |
| Weight | 136 lbs |
| Dimensions | Approx. 38 x 23.5 x 29 in (L x W x H) |
| Hose storage | Hooks |
| Soap injection | Via siphon hose |
|---|---|
| Nozzles | 0°, 15°, 25°, 40°, Soap |
| Quick connect nozzles | Yes |
| Onboard storage | Yes |
| Hose | 50 ft, ⌀3/8 |
| Security | Low oil, trigger lock and thermal relief valve |
|---|---|
| Emissions | EPA |
| Included accessories | Oil, steel wand, spray gun, high pressure hose, soap hose, 5 nozzles |
| Warranty | 10 years |
| Series | PowerShot |
| Other model numbers | 60456 |
| UPC | 879399000713 |
We've taken extra care to research and verify each of the specifications above. That said, occasional mistakes or omissions are still possible. If you spot any missing or inaccurate information, feel free to suggest a correction so we can address it.
About Simpson
Simpson has over 50 years of experience making quality products for the outdoor power equipment industry. Part of the FNA Group based in Pleasant Prairie, Wisconsin since 2006, they are a vertically-integrated company, meaning most of the parts and accessories are manufactured and assembled by them. Their manufacturing facilities are international, but their gas-powered pressure washers are made in the USA. With the company motto "Driven by Performance", Simpson continues to offer a great variety of pressure-washing systems for the homeowner or the professional contractor.
Warranty Information
The Simpson PS4240 is covered under a warranty for up to 10 years. This warranty may be limited and may not cover all parts of the unit.
For more information about the warranty of Simpson pressure washers, please contact the Simpson Customer Support: 1-877-362-4271.



