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Model#: GRCN6821

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Generac CW15K 79cc Gas 1-1/2 in. Clean Water Pump

  • Generac CW15K 79cc Gas 1-1/2 in. Clean Water Pump
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The Generac CW15K 79cc Gas 1-1/2 in. Clean Water Pump is perfect for homeowners, boat owners, and gardeners. It features a Generac 79cc engine that delivers high-flow capacity to (quickly) remove standing water from basement floors. It can also be used to water lawns and gardens or drain swimming pools, hot tubs, ponds, and window wells. It’s lightweight, compact, and easy to use.
  • Powerful Generac 79cc engine delivers high-flow capacity
  • Custom funnel design allows quick and easy priming
  • Color coded suction and discharge ports ensure that you complete the correct hose connections
  • Easy to use on-board instructions with icons of key touch points
  • Carbon ceramic seal is designed for extended wear and lower maintenance over time
  • Ergonomic carry handle with soft grip adds comfort
  • CW15K 79cc Gas 1-1/2 in. Clean Water Pump - 6821
  • 10 ft. Suction Hose
  • 25 ft. Discharge Hose
  • Strainer


Discharge Capacity: 80 GPM
Engine Displacement: 79cc
Engine Type: Generac
Mechanical Seal: Carbon Ceramic
Port Diameter: 1-1/2 in.



4.0 / 5.0
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Would you recommend?
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Easy To Use (1)
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Yes, I would recommend this to a friend
Easy To Use
Great Value
I purchased the pump to remove water off the winter pool cover and from the underground sump of the in ground pool. The pump was well packaged and accessories included were everything I needed to get the job done. Engine oil, extra spark plug with wrench, and a funnel to add the oil were in the kit. Caution as the oil included is more than the engine needs so you can overfill the crankcase. I only took a few minutes to get the pump ready to go to work and out to the pool we went. I had an issue getting the pump to prime and I was following all proper procedures. After about 30 min of no success I finally traced the issue to air getting in around the rubber seal provided for the inlet coupling. Caution do not overtighten the coupling or it will distort the rubber seal and allow air in. Once repositioned, the pump primed right away. The engine is quiet loud and it likes its fuel. I only managed about 30min on a tank of fuel. Another thing I ran into was the engine would periodically stall out. It always started first pull again but I can't understand why it stalled to begin with. It wanted to be choked even when starting it hot but it always started first pull. Overall I am happy with my purchase with a couple issues thrown in. Another reason I purchased this pump was I have a Generac 17KW standby generator that worked flawlessly now for over 2yrs and I am hoping the quality carries over to the rest of their equipment.
March 30, 2015

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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.