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22kW Generac Guardian 6551 Home Standby Generator with 200A SE-Rated ATS | 6551

Availability: In stock


Quick Overview

The 22 kW GuardianĀ® 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 best standby generator.
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    22kW Generac Guardian 6551 Home Standby Generator with 200A SE-Rated ATS | 6551

    Generac Portable iX Series 800 Watt 

    Generac's iX Series inverter technology takes the raw power produced by the generator and passes it through a special electronic microprocessor to provide clean and stable power, safe for computers and other sensitive electronic devices. 


    • True Power Electrical Technology
    • Two Line LCD Multilingual Digital
    • Electronic Governor
    • External Main Circuit Breaker, System Status & Maintenance Interval LED Indicators
    • 5 Minute, Weekly, Bi-Weekly or Monthly Exerciser
    • GFCI Duplex Outlet
    • Sound Attenuated Aluminum Enclosure
    • Includes Flexible Fuel Line Connector
    • Composite Mounting Pad - Attached
    • Pre-Packaged with 200 Amp Service Rated, Outdoor Rated, Automatic Transfer Switch RTSW200A3
    • Natural Gas Or LP Operation
    • Capability to be installed within 18" of a building
    • 5 Year Limited Warranty

    Generac Guardian 22kW Home Standby Generator NG/LP Single Phase Aluminum Pre Packaged with 200 Amp Service Entrance Rated Automatic Transfer Switch | 6551

    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. Additional Load Management is available by adding Generac Smart Management Modules to your system.

    Features & Benefits:

    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 Generac 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:  Thanks to Quiet-Test, your Guardian Series 22 kW home standby generator runs its weekly self-test at a lower RPM for only five minutes. It’s quieter than other brands, and consumes less fuel. Choose your schedule - 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.

    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

    6551 Pre Packaged With:  RTSW200A3 - Generac 200 Amp Service Entrance Rated Automatic Transfer Switch in Nema 3R (Indoor/Outdoor Rated) Enclosure, Flexible Fuel Line Connector, Base Fascia Trim Kit and attached Composite Mounting Pad.  Note: The RTSW200A3 is compatible with Smart Management Modules, Smart Management Modules are sold separately.

     Product Warranty

    Manufacturers Warranty: 5 Year Limited




    Model Number 6551-1
    Manufacturer Generac Power Systems
    Made In USA Yes
    Rated Watts 22kW LP/19.5kW NG
    Rated Amps 91.6 LP/86.3 NG
    Voltage 120/240V Single Phase
    Ac Ton Rating 5 Ton
    Enclosure Aluminum
    Ul Listed Yes
    Decibel Rating 7m 67 dbA @ 23 ft at Normal Operating Load


    Starting System Automatic Start
    Low Oil Alert Yes
    Hour Meter Yes
    Battery Reqments Group 26R, 12V, 525 CCA Min, Not Included
    Mounting Pad Composite Base Attached
    Weight 526 lbs
    Dimensions 48L x 26.2W x 29H


    Engine Brand Generac
    Engine Size 999 cc
    Engine Rpm 3600
    Cast Iron Sleeve Yes
    Cooling System Air Cooled
    Alternator Type Brushed
    Frequency 60 Hz
    Auto Voltage Regulation Yes


    Type Natural Gas (NG) / Propane (LP)
    NG Power Capacity 19.5kW
    LP Power Capacity 22kW
    NG Consumption Full Load 281 cu.ft/hr
    NG Consumption Half Load 184 cu.ft/hr
    LP Consumption Full Load 3.68 gal/hr
    LP Consumption Half Load 2.16 gal/hr

    Transfer Switch

    Model RTSW200A3
    Switch Amps 200 Amps
    Switch Circuits Whole Service
    Ats Poles 2 Pole
    Switch Weight 39 lbs

    Warranty Information

    Consumer Warranty 5 Year Limited Warranty
    Type Standby Generator


    Ship Shipping Dimensions 29H X 48W X 25D
    Ship Shipping Weight 568 lbs

    Additional Information

    Call For Price No

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