#1 Home Improvement Retailer

Internet # 202066580

Model # DH4240B

Store SKU # 268912

Store SO SKU #1000584791

Exclusive

4200 PSI 4.0 GPM Belt Drive Gas Pressure Washer, Honda GX390 Engine, Commercial Cold Water Power Cleaner

Limit 5 per order
$2,299.00
Apply Now
$/mo** suggested payments with mos** financing. Apply Now
  • 4200 PSI 4.0 GPM pressure washer for pro cleaning
  • Perfect for cleaning buildings, docks and high traffic areas
  • Power washer includes gun, high-pressure hose, lance and nozzles
  • View More Details

Free & Easy Returns In Store or Online

Return this item within 7 days of purchase.

Read Return Policy

Ask about this product

Get an answer now with AI

Magic Apron Assistant is an AI virtual assistant. By proceeding, you consent to the recording and use of your information by The Home Depot (and authorized third parties). More information

Product Details

About This Product

DEWALT pressure washers deliver high performance and maximum power straight from the box. They are great for cleaning equipment, wood structures, driveways and vinyl siding. Ideal for commercial portable power washing needs. DEWALT offers sturdy, reliable high pressure cleaners that are easy-to-assemble, easy to start and easy to store. They are perfect for any of your cleaning needs. The DH4240B features a industrial triplex belt drive pump for extended pump life.

Highlights

  • Honda GX390 OHV commercial series engine with oil alert is easy starting, light weight and quiet, yet powerful - engine oil is included
  • Belt drive industrial triplex pump with brass pump head for extended pump life
  • Dual belt-drive system for longer pump and engine life
  • 3/8 in. x 50 ft. high pressure steel-braided hose is non-marring, kink and abrasion resistant and equipped with quick connectors
  • Pro-style spray wand with 5 quick connect nozzle tips- 0, 15, 25, 40 and soap applicator nozzle
  • Professional spray gun designed to be comfortable and easy to operate - safety lock-out to prevent gun from being accidentally activated
  • Welded steel frame, steel engine plate, solid steel axle and 13 in. pneumatic tires for extreme durability and effortless maneuverability
  • Convenient on-board accessory storage for spray gun/wand, high pressure hose and nozzles
  • Downstream detergent injection system for convenient use of cleaners
  • Limited warranty - commercial use - 3-year on Honda GX engine, 5-year on AAA pump, 10-year frame components, 90-days on spray accessory items
  • This product does not ship to California
  • Images shown may vary from the actual unit
  • Return Policy
  • California residents
     see Prop 65 WARNINGS

Product Information

Internet # 202066580

Model # DH4240B

Store SKU # 268912

Store SO SKU #1000584791

Specifications

Dimensions: H 27 in, W 27 in, D 36 in

Dimensions

Assembled Depth (in.)

36 in

Assembled Height (in.)

27 in

Assembled Width (in.)

27 in

Details

Commercial / Residential

Commercial

Engine Displacement (cc)

389

Engine Make

Honda Engine

Features

Chemical/detergent injection, Kink free hose, Quick connect tips

Included

Adapters, Engine oil, Hose, Hose connect, Nozzle cleaning tool, Onboard cord storage, Onboard storage, Wheels

Max Gallons Per Minute

4

Maximum Pressure (PSI)

4200 psi

Nozzle Type

Multi-Pattern

Power Type

Gas

PSI Range

3200+ PSI

Pump Brand

AAA

Pump Type

Triplex

Rated Pressure (PSI)

4200 psi

Returnable

7-Day

Start Type

Recoil Start

Suggested Use

Brick, Decking, Driveway, Paint Preparation, Siding

Water Temperature

Cold

Warranty / Certifications

Certifications and Listings

CETA

Manufacturer Warranty

3 Year Limited Commercial Engine Warranty : 5 Year Limited Pump Warranty : 10 Year Limited Frame Warranty : 90 Day Limited Accessory Warranty

Questions & Answers

What size tip orifices does this unit use?
ByAug 12, 2025
1 Answer | 
Answer This Question

Hi, Jason. This unit takes a 4.0. Hope this helps!

By|Aug 13, 2025


    What is the draw rate for the down stream injector for this machine.
    ByMar 22, 2023
    1 Answer | 
    Answer This Question

    Hi, Scott. The ratio is 17:1. Hope this helps & let us know if you have any further questions.

    By|Mar 24, 2023


      Belt or gear ratio
      ByDec 20, 2021
      2 Answers | 
      Answer This Question

      Zeke, The Ratio is 1:1

      By|Dec 22, 2021

        Excelent products

        By|Mar 31, 2022


          Can I downstream bleach with this machine
          ByMay 5, 2021
          2 Answers | 
          Answer This Question

          Ryan, we do not recommend using caustic chemicals such as bleach as the internal components of the injector are not designed to handle these chemicals

          By|May 6, 2021

          I would not run bleach through this machine!! Bleach is extremely damaging to brass and stainless steel. I would get a chemical hudson sprayer and pre treat area then pressure wash.

          By|May 6, 2021


          Can I use "down streaming" instead of using the pump?
          ByFeb 21, 2021
          4 Answers | 
          Answer This Question

          Mark, the Dewalt DXPW4240B comes equipped with a downstream injection system.

          By|Feb 22, 2021

            Mark, the Dewalt DXPW4240B comes equipped with a downstream injection system.

            By|Jan 17, 2024

            Do you mean, add a soap injector at the gun? Or, can I hook up a wet sandblaster ? of course. And this thing is bulletproof. Add a particulate filter at the water supply inlet to eliminate scoring in the pump, or fouling of the valves. It has plenty of power and flow to run add ons.

            By|Feb 23, 2021

            Mark, the Dewalt DXPW4240B comes equipped with a downstream injection system.

            By|Feb 22, 2021


              Hi. Can synthetic oil be used? Thanks.
              ByOct 24, 2020
              3 Answers | 
              Answer This Question

              yes

              By|Oct 26, 2020

                yes you can

                By|Oct 26, 2020

                  Crlitos, Yes you can use synthetic oil in the engine.

                  By|Oct 26, 2020


                  can I use this pressure washer everyday?
                  BySep 2, 2019
                  2 Answers | 
                  Answer This Question

                  Marceau, yes this is an industrial machine and is designed to be used daily

                  By|Sep 2, 2019

                  Yes

                  By|Sep 3, 2019


                    Can you connect a foam cannon to wash cars
                    ByJul 22, 2019
                    2 Answers | 
                    Answer This Question

                    FGDetails, Yes a Foam Cannon can be used as an attachment to the end of the wand with this machine

                    By|Jul 23, 2019

                    I did not try that option so I can not answer. The power wash is very powerful machine for washing cement floors.

                    By|Jul 24, 2019


                      Viewing 1-8 of 29

                      Customer Reviews

                      4 out of 5

                      • 4 out of 87 reviews
                      • 72% recommend this product
                      Filter by:
                      Showing 1-10 of 87 reviews
                      Excellent Machine.
                      It’s an excellent machine, Super powerful and efficient working.I go like to buy again.
                      by
                        • Recommended
                        Strong & portable
                        The version of this 20+ years ago was a beast but lasted for decades. This more compact model appears to have similar power & dependability. Still early with the experience with this one but love the consistent 3 year base warranty that DeWalt provides.
                        by
                          • Recommended
                          Never purchase this
                          I purchased two of these pressure washers, and put hour meters on both of them. One had ten hours on it and the pump failed. They denied the warranty claim stating it wasnt under warranty. Once the other hit 50 hours, the pump also failed. The claim was once again denied as they said the pistons were a wear item and not covered. The list of not covered "wear" items is basically the whole pump. They do not honor any warranty. Never purchase a AAA pump, they fail and will deny the warranty. I will tell everyone I know who is looking to purchase a pressure washer to completely avoid this brand.
                          by
                          Response from DEWALT Pressure Washer SupportNov 28, 2025
                          This isn't the experience we strive for David, & we're sorry to hear about the difficulties in getting these issues resolved. We would like to accelerate your case to upper management. Would you reach out directly to our National Service Manager? He can be contacted at DHattan@fna-group.com. We would like to understand more about field service issues you have described and hope to improve this experience as quickly as possible. Thanks for reviewing and we hope you will be in contact with him soon. fna-dewalt
                            This customer chose to rate the product and not provide text.
                            by
                            • Verified Purchase
                            First time started the handle broke into pieces. Bought...
                            First time started the handle broke into pieces. Bought for Christmas present and this is the first time to start. What can you do about it. It is supposed to use for work. Model number is DH4240B
                            by
                            Response from DEWALT Pressure Washer SupportMay 9, 2022
                            Hi, cecelia. We are sorry to hear about the difficulty you had with the handle & would like to learn more about the condition of your unit upon unboxing. Would you reach out to our support team directly at 877-362-4271? We'd like to help you get the part you need to up & running. Thanks for your time/feedback and we hope you will be in touch soon. fna-dewalt
                            • Verified Purchase
                            motor is great, pump is bad
                            we purchased in september and after 6 month a seal w3ent out in the unloader and is spraying tons of water out. Im trying to find a seal to fix it. i purchased a belt drive this time to get the longevity you'd expect but the pump is crap.
                            by
                            Response from DEWALT Pressure Washer SupportMay 4, 2022
                            Hi, schuboy. We are sorry to hear about the worn seal. Would you reach out to our support team directly at 877-362-4271? We would like to help you find the parts you need to get up and running again. We really appreciate your time & feedback and hope to hear from you soon. fna-dewalt
                              • Recommended
                              This customer chose to rate the product and not provide text.
                              by
                              • Verified Purchase
                              This customer chose to rate the product and not provide text.
                              by
                                This customer chose to rate the product and not provide text.
                                by
                                  Dewalt
                                  In my opinion this pressure washer is good..after a week of usin the unit the belt cover came off and the screw got lost …. Not happy
                                  by
                                  Response from DEWALT Pressure Washer SupportDec 13, 2021
                                  Hi, Jose. We are sorry to hear about the belt cover & lost screw. Please reach out to our pressure washer support team when you can at 877-362-4271 so we can learn more about what happened & try to help you get reassembled. We appreciate your time and feedback & hope you will be in touch with us soon. fna-dewalt
                                    Showing 1-10 of 87 reviews

                                    Compare Key Features

                                    current item

                                    Product Snapshot

                                    Built for heavy-duty cleaning, this pressure washer boasts a powerful Honda GX390 engine and durable AAA Triplex pump. Ideal for professionals or homeowners seeking exceptional performance and reliability.
                                    Built for professionals, this pressure washer offers 4400 PSI of power. Its durable steel frame and premium tires ensure reliable performance.
                                    Built for tough jobs, this pressure washer is ideal for customers who want professional-grade cleaning power with a reliable Honda engine, ensuring exceptional performance and longevity.
                                    Built for professionals, this gas pressure washer boasts a Honda engine and CAT pump for ultimate power and reliability.

                                    Maximum Pressure (PSI)

                                    4200
                                    4400
                                    4400
                                    4200

                                    Flow Rate (GPM)

                                    4
                                    4.0
                                    4.0
                                    4.0

                                    Engine Power (HP/CC)

                                    389
                                    420
                                    389
                                    389

                                    Adjustable Pressure

                                    Hot Water Capability