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Model # 6437
MSRP: $2,959.00
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About Generac.com

Who is Generac?

Since 1959, Generac Power Systems has been designing and manufacturing backup power generators for residential, commercial and industrial applications. They have grown to be the world's largest provider of residential standby generators. Generac generators has revolutionized the commercial market with the first cost effective product line meeting the needs of small and mid-sized businesses.


Avg. Product Review Rating: 5.0/5 (based on 4 reviews - read reviews) Write a Review - $10 Store Credit

Generac Guardian 11kW Standby Generator Pre Packaged with 50 Amp 12 Circuit ATS 6437

  • True Power Electrical Technology
  • Two Line LCD Multi-Lingual Digital Evolution Controller
  • Includes 50 Amp Pre-Wired 12 Circuit ATS
  • Electronic Governor
  • External Main Circuit Breaker, System Status & Maintenance Interval LED Indicators
  • Sound Attenuated Enclosure
  • Flexible Fuel Line Connector
  • Composite Mounting Pad
  • Natural Gas or LP Gas Operation
  • 5 Year Limited Warranty
  • UL 2200 Listed


Generac Power Systems 6437 Details and Specifications

The 6437 standby generator from Generac includes the 50-ampere automatic transfer switch with load center. When a storm or other event interrupts utility power, the generator and transfer switch operate automatically to supply your home with up to 11 kilowatts of backup emergency power, to protect your home and family from unexpected power outages.

Fuel Choices

The 6437 standby generator is factory ready for Natural Gas, but easily and quickly converts to LP gas (propane) during installation. LP gas allows the generator to produce a full 11 kilowatts of power, and 10 kilowatts using natural gas. At half load, the generator uses 1.2 gallons of LP gas or 124 cubic feet of natural gas. Actual fuel consumption is directly related to the electrical load which changes continuously.


The GH-530 is an 18-horsepower, overhead-valve industrial engine designed specifically by Generac for use in its generators. The electronic ignition engine runs at constant 3600 RPM for clean, smooth electrical output from the generating unit. Features like 'Spiny-Lok' cast iron cylinder walls for extra rigidity, a pressurized lubrication system, and a 200 hour-2 year maintenance schedule allow for extended operation during long-term outages with minimal maintenance and exceptional reliability.

Evolution Controller

The Evolution Controller handles most generator functions, including starting, stopping, and exercising the generator. It senses a power outage, starts the generator and signals the transfer switch to switch the house onto standby generator power. While the generator is operating, the Evolution monitors the voltage level and frequency and adjusts it to maintain utility-quality power. Once power is restored and the house is moved back onto utility power, it allows the generator engine to run during a cool-down period and then shuts it down.

Features include a programmable exercise period that keeps the generator lubricated and ready to run, advanced fault detection and reporting, and a dealer programmable start delay (2 to 1500 seconds) that guards against starting during momentary power interruptions. The controller includes a smart battery charger and alerts the homeowner to failing battery conditions. The color-coded membrane keypad and high-visibility LED indicators make using the controller easier than ever before.

The optional Mobile Link system keeps you connected to the generator wherever you go with text message alerts to your cell phone and access via laptop, smart phone, or tablet to the controller through a web-based dashboard where you can check on maintenance, get generator status, and other controller functions.

The basic wireless controller (optional) keeps you informed of generator status from inside your home, while the advanced model allows you to view alerts, status, and test the generator or program exercise periods.

Automatic Transfer Switch

The included automatic transfer switch is a pre-wired, 50 amp transfer switch and load center with 12 circuit breaker positions. Included are five 120-volt, 15-amp circuits, three 120-volt, 20-amp circuits, one 240-volt 30 amp, and one 240-volt 40 amp circuit. 240-volt circuits use two positions each.

The automatic transfer switch has two pre-wired conduits, one to connect directly to the main service panel and the other to the standby generator, greatly simplifying wiring and installation.

When utility power is interrupted, the transfer switch receives a signal from the Evolution Controller and switches the load center from utility power to generator power to supply your selected critical circuits with power until utility power is restored.

Generator Unit

The power generating unit utilizes a brush-less design that incorporates a revolving magnetic field and skewed stators. Brush-less technology improves reliability and extends the life of the generating unit. The revolving field and skewed stators provide better power regulation and a higher surge capacity for starting air conditioners and other large motors, even when the generator is under a continuously changing load.

Appearance and Noise

An all metal, steel enclosure with powder coat paint keeps the unit looking good, in all environments. The lockable hinged lid provides easy access to the controller and engine maintenance. At just 63db, the 6437 is quieter than many air conditioners and with the 48-inch-wide 25-inch-deep and 29-inch-high footprint, it fits into any neighborhood setting.

Product Videos

What is a Generac Automatic Home Standby Generator (01:47)
When the power goes out even if its just for a few hours life is disrupted
  • What is a Gene...
    When the power goes out even if its just for a few hours life ...

Warranty Information

Manufactures Warranty: 5 Year Limited

Product Specifications

Model Number 6437
Series Guardian Series
Manufacturer Generac Power Systems
Made In USA Yes
Rated Watts 11/10kW
Rated Amps 45.8 LP/41.7 NG
Voltage 120/240V Single Phase
A/C Ton Rating 3 Tons
Enclosure Steel
UL Listed Yes
Decibel Rating 63 db(A)
Starting System Automatic
Low Oil Alert Yes
Mainline Breaker 50 Amps
Hour Meter Yes
Battery Requirement Group 26R, 12V, 525 CCA
Mounting Pad Composite Base Attached
Product Weight 407 lbs.
Dimensions (Inches) 48L x 25W x 29H
Engine Brand Generac OHVI V-Twin
Engine Size 530 cc
Engine RPM 3600
Cast Iron Sleeve Yes
Cooling System Air Cooled
Alternator Type Brushed
Frequency 60 Hz
Auto Voltage Regulation Yes
Fuel Type LP/NG
NG Power Capacity 10kW
LP Power Capacity 11kW
NG Consumption @ Full Load 195 cu.ft/hr
NG Consumption @ 1/2 Load 124 cu.ft/hr
LP Consumption @ Full Load 1.92 gal/hr
LP Consumption @ 1/2 Load 1.18 gal/hr
Transfer Switch
Transfer Switch Model RTG12EZA1
Transfer Switch Amps 50 Amps - Nema 1 Indoor Rated
Transfer Switch Circuits 12 Pre Wired Circuits
1-40 Amp 240V
1-30 Amp 240V
3-20 Amp 120V
5-15 Amp 120V
ATS Poles 2
Transfer Switch Weight 70 lbs
Warranty Information
Consumer Warranty 5 Year Limited
Shipping Weight 507 lbs
Shipping Dimensions 44H x 51W x 26D
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Product Reviews

  1. Always pleased by Generac

    Posted by Robby F. on 1st May 2014

    We have bought multiple models of Generac standby generators over the years. Never had a problem with any of them. Highly recommended.

  2. No More Dark Nights

    Posted by David Guy on 28th Dec 2013

    I had 2 portable generators in the garage for when the power went out. At least twice a year I would drag them out and run extension cords to the appliances and lights that I needed to power until the electric came back on. Sometimes that would be days. Last year a friend of mine put in a Generac 17kW Generator at his house and I was sold. My wife was sold when we went over and they had power and none of their neighbors did. Just finished the installation of our Generac Standby 11kW Guardian Series. Easy to install and couldn't be happier. Highly recommended.

  3. Model #: 6437

    Posted by Dwight Lubansky on 22nd Dec 2013

    Bought the 10kW Generac that this is the replacement for now and took a day to build a nice platform, another day to do the gas plumbing to the generator and then a day to wire up the transfer switch. Was a fairly straight forward installation and runs wonderfully. Small oil leak I hope will be resolved when I change it's oil.

  4. Very pleased!

    Posted by Mike on 11th Oct 2013

    I was leaning toward the 10kw Guardian, but this unit took its spot in the lineup. Being a new model, I was skeptical, but I'm so glad I went for it. The Evolution control is sleek and modern and I believe even easier to use than the previous interface. The 50 amp generator panel was a new style also, but the installation was a breeze....highly recommended!

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Shipping Terms

All generators include 24 hour delivery notification and residential delivery. Liftgate service is available on all air-cooled generators and some liquid cooled units – Please call for verification. Free Shipping is curbside service only. Curbside service means the freight company will deliver to your address and lower your generator to the ground. The freight company will not back down driveways, place a generator in a building or where it is being installed. You are responsible for arranging the movement and setting of the generator.

Some restrictions apply to "Free Shipping" you may either view our
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