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 hard, unpainted surfaces
- cleaning of painted and frail surfaces
- applying detergent and cleaning solutions
Powered by an impressive 389 cc (11.7 hp) engine, its triplex pump can deliver a pressure of 4200 PSI (around 70 times more than a standard garden hose) and a flow of up to 4 GPM (values claimed by the manufacturer). Combined, these values mean that the DeWalt DH4240B has a cleaning power of 16800 Cleaning Units.
The Honda GX390 engine of this gas-powered pressure washer gets started by a classic pull-start mechanism.
The fuel is stored in a tank, which can hold up to 1.6 gallon of gasoline.
Design & Handling
The wheelbarrow design of the DeWalt DH4240B grants mobility and stability to the unit. The robust and sturdy welded steel frame offers longevity to the assembly. The handle adds to the DH4240B convenience of transport.
The unit's weight of 145 lbs renders its carrying and transportation challenging, as it is far from lightweight. A key role in its final weight is played by its 389 cc Honda GX390 engine, the triplex pump and welded steel frame. However, the unit’s two 13" pneumatic wheels are crucial to its maneuvrability, since they provide a smooth method of manipulation on the job.
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. The detergent is automatically added to the water when a soap nozzle is connected.
- Pressure hose: Using a set of convenient hooks, the included 50 ft ⌀3/8" high-pressure hose (4500 PSI rating) can be easily stored on the unit when it is not running.
- Spray gun and wand: Both the classic ergonomic spray gun and its wand may be conveniently stored in a side hook. The gun features a rotating auxiliary side handle to further improve the comfort of both left and right-handed users.
- Nozzles: The table below shows you the 5 included nozzles, as well as the surfaces they're the most appropriate for.
|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: With the DeWalt DH4240B's handy storage area, you’ll always have all the necessary nozzles and accessories at hand and thus, you’ll be fully prepared for any job.
- Safety: Safety of operation is enhanced by a thermal relief valve (which helps to prevent internal pump damage), a trigger lock mechanism (which prevents accidental operation) and a low oil protection.
- Accessories: The DeWalt DH4240B comes with an owner's manual (opens in a new tab) and some basic documentation to get you quickly started. On top of that, you also get nozzle cleaner, spray gun, wand, pressure hose, oil and soap hose.
- 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.
- Reaching a 4200 PSI max pressure output, the DeWalt DH4240B has an expected pressure value, compared to the other gas-powered units in the $1100 to $1500 price range. If your priority is the highest possible power of the water stream, in this price range, we suggest checking out the Lifan LFQ4515E-CA, which reaches up to 4500 PSI.
- With a maximum GPM of 4 (gallons per minute), this washer belongs to the best in terms of water flow, in its respective price range.
- Boasting with 16800 Cleaning Units (PSI x GPM), the DH4240B is one of the more efficient devices in its respective price range. In case you are looking for the highest overall cleaning power, in this price range, one of the current champions is the Lifan LFQ4515E-CA and its 18000 Cleaning Units.
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).