Model#: GRCN6602

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Brand new items;Full manufacturer warranty available
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New items with possible minor cosmetic damage; CPO 120 day money back guarantee
Returned items inspected, repaired and tested by CPO technicians; CPO 60 day money back guarantee

Generac 6602 OneWash 2,000 - 3,100 PSI 2.8 GPM Residential Gas Pressure Washer

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Product Overview


Perfect for those who deal with various tasks on a multitude of surfaces, Generac's OneWash 2000 - 3,100 PSI Pressure Washer is a must-have companion. With the Powerdial variable pressure control and consolidated panel, you not only have the capability of adjusting the spray pressure to adapt to any job, but also have all the pressure washer's control in one single location.
This pressure washer's versatility extends from at-home to on-the-job tasks.
Non-CARB Compliant Product - This product does not meet CARB regulations and is not available for sale or use in the state of California.
  • No need to scour for different buttons or switches as the consolidated panel keeps everything in one single location
  • PowerDial variable pressure control adjusts the spray intensity to tackle various cleaning tasks
  • Includes a 0 degree, 25 degree, and soap quick-click nozzle tips
  • Powerful 212cc Generac OHV engine delivers maximum cleaning performance and reliability
  • Axial cam pump with easy-access hose connections prevents kneeling down on the ground
  • Drainable detergent tank allows for easy cleaning of the tank after each use
  • Oversized never-flat tires provides improved mobility on rugged terrain
  • 30 ft. high pressure hose provides an extended range for improved usage and coverage
  • Designed and built in the USA for quality you can rely on
  • OneWash 2000 - 3,100 PSI 2.8 GPM Residential Gas Pressure Washer - 6602
  • Spray Gun
  • 30 ft. High Pressure Hose
  • (3) Quick-Click Nozzle Tops (0 degree, 25 degree, Soap)


Series: OneWash
Length: 20.6 in.
Width: 21 in.
Height: 39.5 in.
Weight: 68.5 lbs.
Built-in Detergent Tank: Yes
CARB Compliant: No
Case Included: No
Chemical Injection Method: Siphon Tube
Engine Displacement: 212cc
Engine Make: Generac
Engine Type: OHV engine
Frame Type: 2-Wheel Cart
Hose Connection: Quick Connect
Hose Diameter: 5/16 in
Hose Length: 35 ft
Hose Material: Polyurethane
Max. Water Flow Rate (GPM): 2.8
Max. Water Pressure (PSI): 3100
Motor Type: Brushed
Nozzle Type: Quick-Change
Nozzles Included: Yes
Powered Tool Power Source: Gas
Pump Type: Axial Cam
Spray Gun Connection: Quick Connect
Starter Type: Recoil
Water Temperature: Cold
Wheel Size: 10 in
Wheel Type: Never-Go-Flat



4.8 / 5.0
260 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Yes, I would recommend this to a friend (13)
No, I would not recommend this to a friend (1)
Powerful (8)
Lightweight (2)
Easy To Use (1)
Best Uses
Frequent Use (1)
Large Projects (1)
Small Projects (1)
Home Repair (1)
This product is extremely versatile
Product is extremely versatile. Works great for cars to wood decks. The only problem is the soap dispenser. It does not seal and leaks badly.
October 4, 2017
Originally posted at
Solid product for residential use
I purchased the OneWash based on the consistent reviews online listing product quality and it did not disappoint. It performs as advertised and even exceeded expectation. My only thought of a missing piece or part was not providing soap blaster and turbo nozzles that are included with lower cost models. Overall I am very happy with my purchase decision.
September 25, 2017
Originally posted at
need servicing
I have model #0064360 accd to the book but online shows #6602. I am having a hard time getting a carburetor kit for it. It leaks around the bowl. The unit was starting OK but quit when closing the choke knob. I took the carb apart and put it back together properly. I may need a new carb. Where can I buy one and what is the part number? A diagram of the carb would be nice. When it works it is fantastic compared to other washers.
September 10, 2017
Originally posted at
attention to enginering and quality are obvious
I researched for a pressure washer online and looked at several makes.The Generac One Wash really stood out with it's features and obvious attention to details . The engineering and quality of materials are top notch. Rated for residental use but pro quality is definitely in mind.
August 29, 2017
Originally posted at
This is the one to buy!
We've had other power washers and this is the best! We have used it so far on decks, sidewalks, patio furniture, and siding at our place on the lake. Easy to assemble. Much easier to start than other brands. Not too noisy. Great on gas. Very powerful. Great features like the folding handle for easy storage, different pressure choices for a variety of surfaces to clean, easy access to hose hook up, detergent tank instead of bottles, big wheels that make moving it around easier, and the long high pressure hose that we didn't have any problems with kinking and could reach the second level. We would definitely recommend a Generac!
August 9, 2017
Originally posted at
Money well spent
This is the 4th pressure washer I have owned and is hands down the best. In my opinion it is the top of the line pressure washer for any home owner. I have a ten acre place, a mini farm if you will and it does the job. I just finished using the OneWash to power wash my standing seam metal roof on our two story farm house. It was terrific in removing the old tar/asphalt coating and blew away any other debris. Yet you can dial it back for areas where the 3100 psi is too much. I have never pulled the starter rope more than 4 times before it came to life. The only negative remark is the top part of the folding handle is plastic. I'm sure it will break eventually. When it does I will make a metal replacement.
August 6, 2017
Originally posted at
Easy to use
Unit was easy to assemble. Started right up and stripped our deck very quickly. I am impressed.
August 1, 2017
Originally posted at
Convenient and works great
This unit came packed well, assembled easy. It's very powerful for home use. I like the large diameter wheels. The handle folds down for compact storage.
July 27, 2017
Originally posted at
I like the variable pressure!
The website was very hard to navigate. Machine is very quiet. An O-Ring broke after 5 hours of use.
July 8, 2017
Originally posted at
Difficult to start
Very difficult to start because of kickback even with depressurizing wand. Usually get someone to hold trigger while I start it
June 30, 2017
Originally posted at

Questions & Answers

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Browse 11 questions Browse 11 questions and 11 answers
How do you completely empty the motor oil compartment to add clean motor oil?

Thank you.
Stella on Dec 16, 2014
BEST ANSWER: Please contact Generac's technical support for assistance. 1-888-436-3722
what type of pump comes with this unit. two types are listed
Bob the Builder on Sep 23, 2015
BEST ANSWER: The Generac 6602 has an axial cam pump
how do you change the battery?
TOM on Jun 19, 2017
BEST ANSWER: There is no battery.
what makes it cut off while in use?
A shopper on May 4, 2019
BEST ANSWER: Your question will be best answered by the manufacturer, who can provide you with the accurate information. The number to reach the technician is 1-888-436-3722.
Trying to figure out what size spark plug is needed?
Paul F on Apr 18, 2019
BEST ANSWER: The spark plugs for model 6602 will be 0J00620106.
Motor starts and stops after a couple of minutes.
Joe on Apr 24, 2016
BEST ANSWER: Please contact CPO Customer Care
Is this a durable unit? Or will it break down just after the warranty expires?
jim on Apr 10, 2015
BEST ANSWER: Generac makes a good product in terms of durability. It is made to be used everyday
why does the reviews say the one wash has water oil warning light shut off
ted waiting on delevery on Nov 25, 2014
BEST ANSWER: We can only assume that the reveiwer intended to review a different model. Generac's model 6602 does not offer a low oil shut off feature.
when I push the off button the unit does not shut down?
jeff s on Apr 8, 2017

New Vs. Reconditioned

What's the difference between New and Factory-Reconditioned?

Factory-Reconditioned products have been returned to the manufacturer and are restored to like-new operating condition; they go through a rigorous testing and inspection process. Plus, they offer a significant savings vs. new.
  • Reconditioned products may have minor cosmetic blemishes or scratches that do not affect item performance.
  • Reconditioned products may not come with all of the consumables the new version comes with (bits, sanding pads/papers, cases, etc.).
  • Both come with a manufacturer warranty and are covered by our Money Back Guarantee; New is 30 days, Reconditioned is 120 days.
Condition: New Factory Reconditioned
Features: Same Same
Specs: Same Same
Includes: OneWash 2000 - 3,100 PSI 2.8 GPM Residential Gas Pressure Washer - 6602,
Spray Gun,
30 ft. High Pressure Hose,
(3) Quick-Click Nozzle Tops (0 degree, 25 degree, Soap)
OneWash 2,000 - 3,100 PSI 2.8 GPM Residential Gas Pressure Washer - 6602R
Availability: Out of Stock Out of Stock
Warranty: 2 Year null



For a period of two years from the date of original sale, Generac Power Systems, Inc. (Generac) warrants its Pressure Washers will be free from defects in materials and workmanship for the items and period set forth below. Generac will, at its option, repair or replace any part which, upon examination, inspection and testing by Generac or a Generac Authorized Warranty Service Dealer, is found to be defective. Repair or replacement pursuant to this limited warranty shall not renew or extend the original warranty period. Any repaired product shall be warranted for the remaining original warranty period only. Any equipment that the purchaser/owner claims to be defective must be returned to and examined by the nearest Generac Authorized Warranty Service Dealer. All transportation costs under the warranty, including return to the factory, are to be borne and prepaid by the purchaser/owner. This warranty applies only to Generac Pressure Washers and is not transferable from original purchaser. Save your proof-of-purchase receipt. If you do not provide proof of the initial purchase date, the manufacturer’s shipping date of the product will be used to determine the warranty period.

***This Warranty only applies to units sold for use in the US and Canada.***


Consumer applications are warranted for two (2) years.


YEAR ONE – Limited comprehensive coverage on Labor and Part(s) (proof of purchase and maintenance is required):

  • • All Components

YEAR TWO - Limited comprehensive coverage on Part(s) (proof of purchase and maintenance is required):

  • • Engine only – Major components including: Block, head, crank, cam, rods and pistons.

NOTE: For the purpose of this warranty “consumer use” means personal residential household or recreational use by original purchaser. Any use of the Pressure Washer in a commercial or rental application will void the warranty.


  • • The customer is responsible to read and follow all operating instructions.
  • • Products that are damaged due to improper operation, will not be covered by warranty. This includes water pump components that are started without the required water flow and pressure.
  • • The customer will be responsible to transport the product to an authorized Generac repair facility for all Warranty All Components.
  • • Verification of maintenance may be requested for coverage of Warranty Repairs.
  • • Warranty Labor Rates are based on normal working hours. Additional costs for overtime, holiday or emergency labor costs for repairs outside normal business hours will be the responsibility of the customer.
  • • Warranty Parts shipment costs are reimbursed at ground shipment rates. Costs related to requests for expedited shipping will be the responsibility of the customer.


  • • Generac pressure washers that utilize non-Generac replacement parts.
  • • Costs of normal maintenance and adjustments.
  • • Failures caused by any contaminated or improper fuels, oils or lack of proper oil levels.
  • • Repairs or diagnostics performed by individuals other than Guardian/Generac authorized dealers not authorized in writing by Generac Power Systems.
  • • Failures due, but not limited, to normal wear and tear, accident, misuse, abuse, negligence or improper use. As with all mechanical devices, the Generac engines need periodic part(s) service and replacement to perform as designed. This warranty will not cover repair when normal use has exhausted the life of a part(s) or engine.
  • • Failures caused by any act of God and other force majeure events beyond the manufactures control.
  • • Water freezing in the pump (water must be drained from the pump at the end of the season in freezing climates).
  • • Damage related to rodent and/or insect infestation.
  • • Products that are modified or altered in a manner not authorized by Generac in writing.
  • • Any incidental, consequential or indirect damages caused by defects in materials or workmanship, or any delay in repair or replacement of the defective part(s).
  • • Failure due to misapplication.
  • • Expenses related to “customer instruction” or troubleshooting where no manufacturing defect is found.
  • • Rental equipment used while warranty repairs are being performed.
  • • Starting batteries, fuses, filters, light bulbs and engine fluids.

THIS WARRANTY IS IN PLACE OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, SPECIFICALLY, GENERAC POWER SYSTEMS MAKES NO OTHER WARRANTIES AS TO THE MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Any implied warranties which are allowed by law, shall be limited in duration to the terms of the express warranty provided herein. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to purchaser/owner.

GENERAC POWER SYSTEMS ONLY LIABILITY SHALL BE THE REPAIR OR REPLACEMENT OF PART(S) AS STATED ABOVE. IN NO EVENT SHALL GENERAC POWER SYSTEMS BE LIABLE FOR ANY INCIDENTAL, OR CONSEQUENTIAL DAMAGES, EVEN IF SUCH DAMAGES ARE A DIRECT RESULT OF GENERAC POWER SYSTEMS, INC. NEGLIGENCE. Some states do not allow the exclusion or limitation of incidental or consequential damages, so the above limitations may not apply to purchaser/owner. Purchaser/owner agrees to make no claims against Generac Power Systems, Inc. based on negligence. This warranty gives purchaser/owner specific legal rights. Purchaser/owner also may have other rights that vary from state to state.