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Guardian 22kW with Whole House Switch

Guardian 22kW with Whole House Switch

Model #6551

Starting At

$4,799.00 MSRP MSRP Includes Transfer Switch and Not Installation Add to My Products

Guardian 22 kW Generator Features and Benefits

The 22 kW Guardian® Series home standby generator is the largest air-cooled home standby generator on the market. Not only does it deliver all the features and functionality customers have come to expect from the market-leading brand of home standby generators, but with an MSRP that is the lowest cost per kilowatt of any air-cooled home standby generator. Provides whole house coverage for many homes.

Guardian 22 kW Generator <strong>Features and Benefits</strong>

Lowest Cost Per Kilowatt
Homeowners can invest in a home standby air-cooled generator size that used to only be available in much more expensive, liquid-cooled models, giving them the lowest cost per kilowatt available.

Generac OHVI® Engine
Your Guardian Series generator might have to get you through days—or weeks—without utility power. Generac’s OHVI® engine, specifically designed for generator use, provides the reliability to power through the most severe outages.

True Power™ Technology
Best-in-class power quality with less than 5% total harmonic distortion means clean, smooth operation of your sensitive electronics and appliances.

Evolution™ Controller
The next generation of intuitive controllers featuring a multilingual, two-line LCD text display with color-coded, backlit buttons.

Certified for 18" Installation to the Home
Third-party certified to NFPA standards to be installed as close as 18” from the home’s exterior wall, provided it is located away from doors, windows, and fresh-air intakes, and unless otherwise directed by local codes.

Easy Installation
When combined with a pre-wired transfer switch or Smart Switch, re-engineered connection points, and composite mounting pad that eliminates the need for a poured concrete base (unless specified by local codes), the Guardian Series 22 kW generator is easy to install.

Rated for Operation in Areas with Low Natural Gas Pressure
In areas with low natural gas pressure, the Guardian Series 22 kW generator can operate on natural gas pressures of only 3.5” of water column.

All-Weather Aluminum Enclosure
Our durable powder-coat finish helps make the sturdy, all-weather aluminum enclosure corrosion resistant, making it ideal for coastal, salt-air climates. It’s also able to withstand 150 mph winds.

Tool-less Fuel Conversion
Switch between natural gas and LP fuel in the field in a few seconds, without the need for any tools.

Quiet-Test™ Mode
All standby generators run a weekly test to ensure the system is running properly. Thanks to Quiet-Test, your Guardian Series home standby generator runs its self-test at a lower, quieter RPM than standard operation, and can be programmed to run weekly, bi-weekly, or monthly.

Mobile Link™ Compatible
Take advantage of Generac’s Mobile Link cellular remote monitoring system and check on your generator’s status using your computer, tablet or smartphone, even when you are away. Sold separately.

Non-cellular remote monitoring options are also available for generator monitoring from inside the home.

24/7/365 Customer Support
Power outages don’t always occur during normal working hours. That’s why Generac’s customer care call center—right here in Wisconsin—provides support any time of day or night, all year long. Generac is standing by 24/7, every minute of every day, to answer your questions.

5-year Limited Warranty

Home Generator Buyer's Guide

Included with This Generator Bundle

Gain up to whole-house coverage through smart power management. If it is unlikely you will turn on every appliance at the same time (most people don’t), a smaller generator paired with a Generac Smart power management transfer switch provides whole-house coverage through a managed power solution. The process is simple - non-essential circuits are shed when the generator approaches maximum capacity to eliminate overload, then are cycled back on when essential circuits are satisfied. Give yourself a little more than just the basics without a substantial increase in your investment.

Download the Spec Sheet

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Rated 5 out of 5 by this products is all it was claimed to be I have only been out of power twice since my installation, on 9/25/14 my generator came on in about 15 seconds after power lost and supplied all my needs until power was restored. June 22, 2016
Rated 5 out of 5 by this generator is exactly what we have been looking for this generator has the power to run our whole house and not break the bank doing it .It also looks nice setting in the flowerbed May 11, 2016
Rated 5 out of 5 by Very pleased so far We are still installing the 22kw generator and would like to be able to switch from natural gas to propane without using tools. I read this was possible. Is there a combination valve we need to buy or is it included with the generator? April 30, 2016
Rated 5 out of 5 by Peace of mind. Generator installed for peace of mind to protect home and or pets if or when we have an outage. Install team performed a great job. Respected the home and made sure the completed job reflected the expectations associated with Generac. October 29, 2015
Rated 5 out of 5 by Peace of Mind I purchased and had the Guardian 22KW installed on 041615. We rarely have power outages in our area but I had the Generac installed specifically for Hurricane season. Lo and behold, the day after my generator was installed our area experienced a tornado and power was out in our area for 9 1/2 hours. Three days later we had another bad storm and the area power was out for 6 hours once again. The Generac did just what it is supposed to do. Within seconds of the electricity being disrupted, the Generac kicked on and powered everything we would normally be using for the entire time. We never even would have known the electricity had gone out if we couldn't hear the generator running outside and the few seconds the house went dark before the generator sensed the problem and started automatically. Our generator runs on propane and after being on for close to ten hours, hardly even budged the propane gauge on our 500 gallon tank. It did not even register a gallon used to power the unit for that length of time. We are extremely pleased with our new Generac 22KW and would highly recommend it to friends or family. The professional installers were very efficient and thorough. They did a beautiful job and even completed the installation even though it was storming outside before they were finished. We have had the generator running for only eleven days and it has powered us for (16) very unexpected outage hours. Apparently we got it just in time. April 28, 2015
Rated 5 out of 5 by Dependable and quality product Installation was completed a week ago just ahead of a heavy wet snowfall. We wondered if we would be protected if the power failed and woke the next morning to hear the motor humming along. Power was lost during the night but the generator never missed a beat powering up immediately and giving us a welcome sound. Peace of mind is worth the investment. February 4, 2015
Rated 5 out of 5 by Installation done - very happy! A whole house generator seemed like an extravagance - our power does not go out that much, but with a well pump providing water - who wants to go without for even a short time. I did my research and quickly realized the generator affords the security and comfort I want, it increases the value of the home and with it being installed, ready to work all the time it is certainly added security for the family if I am traveling. Next I researched brands - I quickly found out from speaking to friends with other brands, parts, service and availability are critical. Generac seems to be marketshare leader therefore has the most available parts and service. I also learned that the Generac models are more reliable than others, so that decision was made. Finally, I chose a really good installer. A family electrical contracting business that has been around for many years who now only does generators. After electric and plumbing was done I was very happy with the finished product. Its amazing - I am actually looking forward to the first time the power goes out so I can see it in action. The testing was flawless. Thanks and keep up the good work!!! December 11, 2014
Rated 5 out of 5 by Excellent generator You need this generator for bad weather and unknown outages, I can't think of not having one!!!! November 29, 2014
  • 2016-06-25 T09:04:35.384-05:00
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Rated 4.9 out of 5 by 54 reviewers.
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The Generac Promise


Peace of mind.

And the power to live.

The Generac Promise means that our 8 – 22 kilowatt Guardian® Series home backup generators will give you peace of mind and the power to live. It means that we engineer and build them here in America*. It means we stand behind them with a strong 5-year limited warranty. We promise to continue to innovate, like with our new Mobile Link™ cellular monitoring system, so you’ll know the status of your generator, no matter where you are. And if you ever need to call, we’re standing by 24/7, every minute of every day, ready to pick up the phone right here in Wisconsin.

*Built in the USA using domestic and foreign parts.

We’ll back you up. We’re standing by. Count on it.

Generac Stock Ticker

  • NYQ
  • GNRC
  • $34.62
  • 6/24/2016 4:04 PM EST