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Model # 6250

Internet # 204007488

20,000-Watt Air Cooled Automatic Standby Generator-DISCONTINUED

This item has been discontinued.
The Home Depot no longer carries this specific product.

$3,997.00 /each



Model # 6250

Internet # 204007488

Store SO SKU # 1000032997

Choose the #1 Selling Home Standby Generator Brand. Generac’s 20kW Guardian Series provides the automatic backup power you need to protect your home and family during a power outage. Connected to your existing LP or natural gas fuel supply, it kicks in within seconds of determining power loss - automatically - and runs for as long as necessary until utility power returns. Control your power. Control your life.

  • Tool-less fuel conversion allows for easy switching between natural gas and LP fuels in the field
  • System Includes: 20kW generator, evolution controller, and composite mounting pad, mobile link and 26R battery purchased separately
  • 24/7 Generac customer care support 365 days a year, power outages do not always occur during normal working hours
  • Generac’s OHVI engine is purpose-built to run dependably for extended periods, delivering power when you need it most
  • Generac’s evolution controller features a dual-line, multilingual LCD display allowing for easy monitoring and management of generator functions, built-in hour meter and external “at-a-glance” indicator lights
  • Certified for 18 in. installation to the home (3rd party-certified to NFPA standards provided it is located away from doors, windows and fresh air intakes and unless otherwise directed by local codes)
  • Easy installation with re-engineered connection points, and composite mounting pad that eliminates the need for a poured concrete base (unless specified by local codes) get it installed 800-557-5221
  • Rated for operation in areas with low natural gas pressure, significantly lower than published numbers for competitive standby systems (Generac is the only manufacturer to certify operation on only 3.5 in. of water column)
  • Sturdy, all-weather aluminum enclosure with rhino coat finish for superior corrosion-resistant protection from the elements, making it ideal for coastal, salt-air climates and able to withstand 150 MPH winds
  • Quiet-test weekly self-test mode runs at a lower RPM, is quieter and consumes less fuel, sound-dampening enclosures are lined with foam panels for further noise reduction
  • DPM technology intelligently manages household loads for a more affordable standby solution
  • True power technology provides clean, smooth operation of sensitive electronics and appliances
  • Mobile link compatible - wireless remote monitoring system, receive status updates using your computer, tablet or smart phone - giving you peace of mind, even when you’re away (purchased separately)
  • Generac promise - engineered and built in the USA supported by a 5 year limited warranty and 24/7 customer care support 365 days a year

Info & Guides

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Product Depth (in.) 
Product Height (in.) 
Product Length (in.) 
Product Width (in.) 
CA (CARB) Compliant 
Not CARB Compliant 
Color Family 
Commercial / Residential 
Continuous Wattage 
Engine Displacement (cc) 
Engine Make 
OEM Branded 
Generator Features 
Hour Meter,Low Oil Shutdown,Overload Protection 
Operational volume (dB) 
Product Weight (lb.) 
451 lb 
Remote Monitoring 
Sold Separately 
Response time (sec.) 
UL Listing 
1-UL Listed 
Warranty / Certifications
Certifications and Listings 
1-UL Listed,CSA Listed 
ENERGY STAR Certified 
Manufacturer Warranty 
5 Year Limited 


Rated 4.8 out of 5 by 251 reviewers.
Rated 5.0 out of 5.0 by Great product Installed 20 kW unit with the smart transfer switch in November of 2014. Simple enough to install. Not for a do it your self project without a huge understanding of multiple trades. Started by picking a 17kw unit. Bought it, waited and waited for it. 2 months later, I finally walked into my supplier and asked in person what is going on. After the run around, they informed me that the 17kw was not available anymore. So I changed suppliers and went to a 20 kW. Had my unit delivered on the next day. I poured the pad one night after work, landed the unit a couple of days later, took a full day on a Saturday with 2 guys to complete the install. Overall, I am happy with the unit that I have. May 25, 2015
Rated 4.0 out of 5.0 by Only had it for 2 days too early to tell Looks good starts good just waiting an outage! It looks like my text is to short so xxxxxxxxxxxx oooooooooo xxxxxxxxx ooooooooo try this July 3, 2015
Rated 5.0 out of 5.0 by model 6729 20/18 kw Generac Generators are extremely dependable in 15 years of owning one and having numerous power outages our generacs have never failed us July 3, 2015
Rated 5.0 out of 5.0 by Worry Free Area has been hit with power outages of over 22 days in last 2 years. Newly renovated house has sump and sludge pumps and if the power goes out . . . . Whole home generator comes on, we have well water and no worries. Transfer system awesome, techs were professional and very well organized. Even in the -20 degree day of installation were great to work with. 4 thumbs up (wife and I). June 12, 2015
Rated 5.0 out of 5.0 by Has shown it is commercial grade We installed the system 3 years ago. There has only been one issue with it when one winter cold snap brought up the need for a cold weather kit. This kit should have been recommended by the installer. No issues since then. In one outage it has ran continuously for almost 5 days without a problem. The one feature item that is needed is to have the system charge the battery while online. Running without a charge for extended periods risks a failed restart if, for example, you stop for a short period to check the oil level. May 26, 2015
Rated 5.0 out of 5.0 by worry free connectivity I've had my generator now for over a year and am very satisfied. Although we have not had any significant power losses, the power has gone out several times for a few hours at a time and the generator has performed well. I work shift work and the power losses were at night, so my wife was very happy that she didn't have to lift a finger to get the power back on; the generator auto started and auto transferred to power the whole house. Very satisfied. May 22, 2015
Rated 4.0 out of 5.0 by the generator worked great for the first 8 months the product worked great for the first 8 months, I really thought it could get no better, than it came up with error code 1500 under voltage, now its going to cost me 300 bucks and than play the waiting game to see if Generac will cover the repairs with the warranty or not May 21, 2015
Rated 5.0 out of 5.0 by Takes the Worry Out of Power Loss Our 20 KW Generac gives us a secure feeling. Our power was out for an hour and a half a week ago. Our generator came on and powered the house without skipping a beat. We don't worry about lost power anymore. May 21, 2015
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Curbside Truck Shipping (By Appointment) includes delivery to receiving area/dock for businesses or curbside for residential orders. The carrier will contact you to make a delivery appointment with a 4 hour window once the items have arrived at the local hub in your area. Delivery appointments are required.

If product is eligible for shipping to AK, HI and US Territories additional transit time and remote surcharges may apply.