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Model # 6244

Internet # 204006877

20,000-Watt Air Cooled Automatic Standby Generator with 200-Amp SE Rated Transfer Switch

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

$4,497.00 /each



Model # 6244

Internet # 204006877

Store SO SKU # 1000032989

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: 20 kW generator, 200 Amp transfer switch, 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 – that is why we are standing by.
  • 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” 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 an intelligent pre-wired transfer switch, 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” of water column.)
  • STURDY, STEEL ENCLOSURE WITH RHINOCOAT FINISH for superior protection from the elements 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).
  • THE GENERAC PROMISE - Engineered and built in the USA supported by a five year limited warranty and 24/7 customer care support 365 days a year.

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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 
Engine manufacturer 
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 249 reviewers.
Rated 5.0 out of 5.0 by Great product. Highly recommend This product is great. We've had numerous power outages over the last year and the generator has never failed. August 7, 2015
Rated 5.0 out of 5.0 by Extremely satisfying! We got a 20 kW Generac installed the summer of 2014 when we moved into a new home. The previous owners had one already but decided to take it. So we just replaced it with a brand new one. So far we have had only two power outages. One in January of 2015 and one about a week ago. We were so happy to have it when we lost power during the ice storm because the whole house could be heated! Also when we lost it a week ago our neighbors were without power for 3 days from just a pop up summer storm, but we weren't because we had a Generac. All of our neighbors had to leave their home to go to a hotel because there was 100+ degree temperatures during the day. We were so relieved that it our generator could run 2/3 AC units and everything else in our 5,000+ sq. ft. home! This was our first backup generator and have been very satisfied since we have moved. So far it's been great and hope it will last a long time. I just wish Generac made an air cooled generator bigger than 22 kW because they are so much more affordable then a liquid cooled and some people don't want to spend $15,000+ dollars for a liquid cooled model that will run 3 AC units at once! July 22, 2015
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
  • 2015-08-29T11:45:09.695-05:00
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