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Generac 8939 GP20000E Generator 20,000W/22,500W Gas EFI 50A Low THD CO Sense Electric Start New

GeneracModel 8939

Generac 8939 GP20000E Generator 20

  • Peak22.5 kW
  • Running20 kW
  • FuelGasoline
  • StartElectric
  • Outlet50 A
Black Friday price
$3,069.00

Black Friday price ends in —

In stock Ships within 24 hours

Free delivery Fri, Nov 6 – Wed, Nov 11 if you order today, by UPS or FedEx Ground to your door.

Not available in California. This model is not CARB certified, so we cannot ship it to a California address.

  • Free shipping48 states + DC
  • 30-day returnsReturn shipping on us
  • Full warrantyBrand-new, from the maker
  • Secure checkoutEncrypted by Stripe
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Questions before you buy? Our small team in Wilmington, NC answers every message personally. Email [email protected]

The Generac GP20000E high wattage portable generator is built to deliver dependable power for home backup, jobsite use, and demanding equipment.

Running watts
20,000 W
Starting watts
22,500 W
Fuel
Gasoline
Start
Electric
Largest outlet
50 A
Safety
CO shutdown sensor
SKU: 8939
Category: , ,

The Generac GP20000E high wattage portable generator is built to deliver dependable power for home backup, jobsite use, and demanding equipment. Its electronic fuel injection engine is designed to provide strong performance and efficient power delivery, while True Power technology helps support sensitive electronics. COsense technology adds carbon monoxide protection, and the electric start system with included battery makes startup easier. A large fuel tank, hour meter, low-oil shutdown, and durable steel tube cradle round out its heavy-duty design.

Not for sale in California.

Full specifications

BrandGenerac
Model8939
Running watts20,000 W
Starting watts22,500 W
FuelGasoline
StartElectric
Largest outlet50 A
SafetyCO shutdown sensor
How it shipsUPS or FedEx GroundTo your door, free
Order today, deliveredFri, Nov 6 – Wed, Nov 11Leaves our warehouse within 24 hours

Tracking is emailed as soon as it ships.

We ship to the 48 contiguous states and Washington, DC. Shipping details · 30-day free returns

Brand-new, with the full manufacturer’s warranty. The terms are set by Generac and included in the box. If something goes wrong, contact us first: we confirm the next steps within 2 business days and help you file the claim.

How warranty claims work

What it can run

20,000 W running, 22,500 W starting

Pick what you want to power at the same time.

Typical wattages – check the label on your own appliances. Where only one figure is published, running watts are estimated at 80% of the starting figure. Connect to house circuits only through a transfer switch or interlock fitted by a licensed electrician.

Compare similar generators

Same power class, side by side.

SpecificationGenerac 8939 GP20000E Generator 20,000W/22,500W Gas EFI 50A Low THD CO Sense Electric StartThis generator$3,069.00Westinghouse WGen20000c 20000W/28000W Generator Low THD 50 Amp Remote Start Gas with CO Sensor$2,529.00Generac GP15000E 15000W/22500W Gas Generator Electric Start$2,459.00
Running watts20,000 W20,000 W15,000 W
Starting watts22,500 W28,000 W22,500 W
FuelGasolineGasolineGasoline
StartElectricRemote and electricElectric
Largest outlet50 A50 A—
SafetyCO shutdown sensorCO shutdown sensor—
LinkYou are hereView →View →

Questions and answers

Answered by our team in Wilmington. Can’t find yours? Ask below.

Can I connect this generator to my house?
Only through a transfer switch or an interlock kit installed by a licensed electrician. Never plug a generator into a wall outlet: it can back-feed the utility line and endanger line workers. Connecting safely.
What can it run at the same time?
Use the What it can run planner above: tick your appliances and it checks both the running load and the start-up surge against this generator.
Does it ship with oil?
It depends on the manufacturer. If oil is included it is listed under What’s in the box; otherwise use the grade given in the owner’s manual before the first start.
Can I use it in the rain?
Not uncovered. Run it on a dry surface under an open, canopy-like cover, at least 20 feet from doors, windows and vents, and never in a garage.
Can it be shipped to California?
Some generators are not certified for sale in California (not CARB compliant). If the description says this model is not for sale in California, we cannot ship it to a California address.
How will it be delivered?
Free, by UPS or FedEx Ground to your door, usually within 2–5 business days after it ships. Tracking is emailed as soon as it ships.
What if it arrives damaged?
Photograph it and email us within 48 hours of delivery. We replace or refund damaged items at no cost to you.
Ask a questionWe reply personally by email.

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