The DeWalt DH4240B is a gas-powered pressure washer offering a maximum water pressure of 4200 PSI and flow of 4 GPM. (Read full specs)
Zoom on the DeWalt DH4240B
In summary, the DeWalt DH4240B is a heavy duty, commercial pressure washer, that offers an all-around versatile cleaning experience, and also:
- spot cleaning of hard, unpainted surfaces or high reach areas
- intense cleaning of tough, paintless surfaces
- cleaning of painted and frail surfaces
- application of detergent and cleaning solutions
Using a powerful 389 cc (11.7 hp) engine, its triplex pump delivers a pressure of up to 4200 PSI (roughly 70 times more than a standard garden hose) and a flow of up to 4 GPM (values claimed by the manufacturer). Together, the values result in a cleaning power of 16800 Cleaning Units.
A classic pull-start mechanism is responsible for starting the gas-powered pressure washer’s Honda GX390 engine.
Gasoline storage is facilitated by a fuel tank with a maximum capacity of 1.6 gallon.
Design & Handling
The wheelbarrow design of the DeWalt DH4240B grants mobility and stability to the unit. The strong welded steel frame assures assembly longevity. The handle adds to the DH4240B convenience of transport.
This model weighs 145 lbs. For this reason, it cannot be called lightweight and thus, carrying and transporting it might be somewhat challenging. Its 389 cc Honda GX390 engine, the triplex pump and welded steel frame add up to a large chunk of the device's weight. However, the unit is manipulated smoothly thanks to its two 13" pneumatic wheels, which play a key role in its maneuvrability.
Along with the DeWalt DH4240B itself, the package also includes a spray gun, a wand, a pressure hose, 5 nozzles and a detergent injection feature, which are discussed in further detail below.
- Soap injection: Even though the device doesn't have a soap tank, detergent is supplied by a siphon hose. Whenever a soap nozzle is connected, the detergent is automatically added to the water.
- Pressure hose: The 50 ft ⌀3/8" high-pressure hose (4500 PSI rating), which is included with the device, can be stored neatly on the unit itself when idle, using a set of convenient hooks.
- Spray gun and wand: A side hook allows for an easy storage of the included classic ergonomic spray gun and its wand. The gun features a rotating auxiliary side handle to further improve the comfort of both left and right-handed users.
- Nozzles: The 5 nozzles included with the device, and the respective surfaces which they’re the most suitable for, are shown in the following table.
|Concrete, brick, masonry||Use with caution||Suitable||Suitable||Suitable||Suitable|
|Siding, gutters, house||Not recommended||Use with caution||Use with caution||Suitable||Suitable|
|Fencing, deck, patio||Not recommended||Use with caution||Use with caution||Suitable||Suitable|
|Lawn equipment, boat, RV||Not recommended||Use with caution||Use with caution||Use with caution||Suitable|
Note: The shape of the nozzles above is for illustration purposes only and may differ.
Red cross: Not recommended. Green check: Suitable. Orange check: Use with caution.
- Onboard storage: The DeWalt DH4240B features a handy storage area, which allows you to neatly store nozzles and accessories and be always prepared by having everything needed at hand.
- 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 DeWalt DH4240B comes with nozzle cleaner, oil, soap hose, wand, pressure hose and spray gun.
- Emissions: The DeWalt DH4240B is EPA-approved and CARB-compliant. Thus, selling and purchasing this pressure washer is allowed in each of the 50 states, including California.
The DeWalt DH4240B's performance versus other pressure washers
The following charts are provided to give you an idea of how the key specs of the DeWalt DH4240B compare to similarly priced pressure washers.
- The DeWalt DH4240B, reaching a PSI of up to 4200, is one of the more powerful gas-powered units in $1150-1500 price range. In case you are looking for a device with the highest possible power of its water stream, one of the top achievers in this price range is the Lifan LFQ4515E-Elite with a PSI of 4500.
- 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.
- The DH4240B, with its 16800 Cleaning Units (PSI x GPM) sits at the high end of the cleaning efficiency spectrum, when compared to other devices of similar price. If you are after the highest overall cleaning power, the Lifan LFQ4515E-Elite with its 18000 Cleaning Units is one of the products that can achieve the highest cleaning efficiency in this price range.
As you can see from this interactive chart, when compared to other gas-powered washers between 16500 and 17000 Cleaning Units, the DeWalt DH4240B 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.
Features and Specifications
|Water||Cold (100°F max.)|
|Engine||389 cc 11.7 HP Honda GX390 4-stroke OHV|
|Soap injection||Via siphon hose|
|Nozzles||0°, 15°, 25°, 40°, Soap|
|Quick connect nozzles||Yes|
|Hose||50 ft, ⌀3/8|
(L x W x H)
|Approx. 45 x 28 x 25.5 in|
|Wheels||2 wheels, ⌀13", pneumatic|
|Included accessories||Oil, nozzle cleaner, wand, spray gun, high pressure hose, soap hose, 5 nozzles|
|Security||Low oil, trigger lock and thermal relief valve|
Unlike many websites, we did our best to research each of the specs above. That being said, we are not immune to making the occasional mistake or omission. Should you notice any missing or incorrect values, don't hesitate to suggest improvements so we can address the issue.
With the invention of the first radial arm saw in 1922 by Raymond DeWalt, the company has since grown into one of the top names in power tools in the industry. Acquired by Black & Decker in 1960, the DeWALT brand has become a favorite of contractors, particularly in North America. It boasts seven manufacturing facilities in the U.S. Though known mainly for professional-grade corded-electric and battery-powered hand tools, the company has also begun to offer some outdoor power equipment as well, such as leaf blowers and string trimmers.
The DeWalt DH4240B is covered under a warranty for up to 3 years. This warranty may be limited and may not cover all parts of the unit.
For more information about the warranty of DeWalt pressure washers, please consult DeWalt's warranty policies (opens in a new tab). Alternatively, you can also contact their Customer Support: 1-800-4-DEWALT (800-433-9258).