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
The Simpson PS4240, a commercial pressure washer, gives its user an all-around versatile cleaning experience, topped off by the following features:
- pinpoint spot cleaning of hard, unpainted surfaces, accessing high areas, and successfully removing stubborn stains
- complete cleaning of hard surfaces, vehicle washing, and surface prep for painting
- delicate surface cleaning, andbroad area cleaning with reduced pressure
- applying detergents or chemicals, and rinsing surfaces afterward
Ahead are presented its power characteristics and design, its main features and any other additional features.
Power
Utilizing an impressive 389cc (11.7 hp) engine, this machine's triplex pump can deliver a pressure of 4200 PSI (around 70 times stronger than a standard garden hose) and a flow rate of up to 4 GPM (CETA-certified values). Thus, the Simpson PS4240 achieves a cleaning power of 16800 Cleaning Units.
To initiate the Honda GX390 engine of this gas-powered pressure washer, a traditional pull-start mechanism is employed.
Containing gasoline, the pressure washer's steel fuel tank can hold a maximum of 1.6 gallon.
Design & Handling
Characterized by its wheelbarrow layout, the Simpson PS4240 provides improved mobility and stability, facilitating easy movement and steadfast operation for effective cleaning results. 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.
Weighing in at 136 lbs, it's safe to say this unit isn't lightweight, which might pose difficulties for users when it comes to lifting and transporting, particularly over uneven surfaces. Its 389cc Honda GX390 engine, the triplex pump and welded steel frame add up to a large chunk of the device's weight. Despite this, the presence of two 13" pneumatic wheels reduces the complexity of moving the PS4240, even on rugged surfaces.
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. Upon connecting a soap nozzle, the pressure washer takes over the task of seamlessly combining the detergent with the water flow.
- Pressure hose: For easy organization, the included 50 ft ⌀3/8" high-pressure hose can be stored on the unit using a set of convenient hooks when it's not in use, ensuring a clutter-free workspace.
- Spray gun and wand: Both the classic ergonomic spray gun and its steel wand may be conveniently stored in a side hook.
- Nozzles: The table below shows you the 5 included nozzles and the surfaces they're the most appropriate for.
0° | 15° | 25° | 40° | Soap | |
|---|---|---|---|---|---|
| Concrete, brick, masonry | |||||
| Siding, gutters, house | |||||
| Fencing, deck, patio | |||||
| Lawn equipment, boat, RV |
Please be aware: The shapes of the depicted nozzles are for illustration purposes and may differ. Symbols utilized include a indicating 'Not recommended,' a for 'Suitable,' and an for '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 thermal relief valve (which helps to prevent internal pump damage) and a trigger lock mechanism (which prevents accidental operation).
- Accessories: Besides the usual owner's manual (opens in a new tab) and documentation to get you promptly started, the Simpson PS4240 comes with spray gun, pressure hose, oil, soap hose and wand.
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.
- Equipped to deliver up to 4200 PSI, the Simpson PS4240 is recognized as one of the gas-powered models delivering higher-than-average water pressure, priced between $1000 and $1300. If the highest possible power of the water stream is your priority, one of the champions in this price range is the DeWalt DXPW4440 with 4400 PSI.
- In the aforementioned price range, the 4 GPM (gallons per minute) of this washer makes it one of the best performing units in terms of the delivered volume of water.
- Boasting with 16800 Cleaning Units (PSI X GPM), the PS4240 is one of the more efficient devices in its respective price range. When considering the importance of superior cleaning power, the DeWalt DXPW4440 stands out with its 17600 Cleaning Units, boasting one of the highest cleaning efficiencies among similarly priced units.
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 cheap side of the price range.
It can therefore be a really good buy if you're looking to acquire a budget pressure washer.
The bottom line
- Inexpensive
- 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.



