Generac 20,000-Watt Air Cooled Automatic Standby Generator with 200-Amp SE Rated Transfer Switch-6244 - The Home Depot
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Model # 6244

Internet # 204006877

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

Generac 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.

Info & Guides

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Assembled Depth (in.) 
48 in 
Assembled Height (in.) 
25 in 
Assembled Width (in.) 
29 in 
Height (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 
Hour Meter 
Low oil shutdown 
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 237 reviewers.
Rated 5.0 out of 5.0 by This Product brings peace of Mind! After 2 storms, I am glad to say I finally invested in a Generac. The 20KW does the entire house and I have a lot less worries! It starts up every Sat AM for its weekly run, and has not skipped a beat. I highly recommend the Mobile Link to receive Text Messages on how your system is doing. April 10, 2015
Rated 4.0 out of 5.0 by low maintenance, reliable back-up other than changing the oil, there isn't much to do but stand out of the way and let the generator do it's thing. the unit isn't loud, but more noise insulation in the cabinet would always be a good thing (for any unit). March 27, 2015
Rated 5.0 out of 5.0 by Excellent peace of mind I just had this generator installed. We live in the country In Iowa and have a gas furnace and well for water. The winters here can be brutal. I can't begin to tell you how much peace of mind this equipment provides. I can rest easy now when I am out of town and not worry that my wife has any concerns with heat, water, the security system or anything else that is dependent on electricity. The system is awesome. It checks itself on a weekly basis and is very simple to maintain. This is probably the best investment I have made for our home. December 16, 2014
Rated 5.0 out of 5.0 by product fits well with most landscaping we had just finished installing our unit and wouldn't you know it there was a power failure and allbeit a very short one it was long enough to have the generator kick in automatically and run longer in cool down stage than protection stage, but still i think it will be worth it in the long run we have had several outages in the past so here's hoping. we also purchased the whole house smart switch for added comfort and protestion Eric December 17, 2014
Rated 5.0 out of 5.0 by should of bought one yesterday dont put it off generac the one only to have in case of power outage the life saver. December 17, 2014
Rated 5.0 out of 5.0 by excellent unit to have i live on a mountain bluff on a dead end road at the edge of the electric utility service region, well outside of any town or city. power outages are not unusual. this unit is reliable and quiet and works like a charm. it was a part of our going in plan when we chose to build in this location and i'm glad to have it included. would do it again and would recommend it to other to consider. November 6, 2014
Rated 5.0 out of 5.0 by Better than 5 stars!!!!! We had our Generac 20kW and whole house switch installed in March 2014. Ever since the install we have been hoping for the power to go out (strange yes but wanting to test the investment). Finally the power went out during a thunderstorm Sept. 1st. The generator started confidently just like it does on it's weekly exercise runs. We were so pleased that we did not need to drag out the old portable generator. During the 6 hours of outage we ran, 3 TVs, 3 computers, the dishwasher, the AC, 2 fridges, 1 freezer, the sump pump, the well pump, the garage door and almost every light in the house at varying times. The Generac never missed a beat and was so quiet when it was time for bed nobody complained like they did with our old portable. Fantastic product. Exactly why my parents and in-laws installed their's a few years ago. September 2, 2014
Rated 5.0 out of 5.0 by Awesome! We had this unit installed and within 2 weeks the power went out for approx. 7 hours. Would have thought it just blinked off then back on thanks to this generator. Love it! Worked like a charm. Could not be happier! September 10, 2014
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