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Generac

Generac 22,500 Starting Watt Portable Gas Generator - Electric Start - Home Backup or RV Ready - Heavy Duty Frame - Quiet, Long Runtime, Emergency Power - 49-State Compliant

  • Based on 221 reviews
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Availability: Only 1 left in stock, order soon!
Fulfilled by OmniHop
Arrives Feb 24 – Mar 4
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Style: 22,500 Watts


Features

  • Powerful Generac Engine - The Generac 8917 HP18000EFI 816cc EFI Engine delivers optimal power for peak performance and efficiency, making it a reliable choice for your power needs.
  • COsense Technology Protection - Stay safe with our COsense Technology that provides powerful protection against hazardous carbon monoxide.
  • TruePower for Electronics - Our TruePower Technology, with less than 5% THD, safely powers sensitive electronics and tools, making it ideal for home use.
  • Low-Oil Pressure Shutdown - Our generator features a low-oil pressure shutdown mechanism that automatically safeguards the engine from damage, ensuring longevity and reliability.
  • Large Fuel Capacity - The large capacity fuel tank, with an incorporated fuel gauge, provides extended run times and durability for long-term use.

Description

From emergency home backup to DIY projects to the jobsite, the Generac GP18000EFI portable generator provides high wattage, dependable portable power. Equipped with an 816cc engine with Electronic Fuel Injection, the GP18000EFI delivers power efficiently, providing up to 9 hours of runtime at 50% load. TruePower™ Technology safely powers sensitive electronics, appliances and tools while onboard COsense® Technology provides powerful protection against hazardous carbon monoxide. The GP18000EFI also features electric start (battery included), low-oil shutdown protection, circuit breaker protected outlets and an hour meter with maintenance resets. The included never-flat wheel kit and available lifting eye accessory make transportation easy around the home or jobsite.

Brand: Generac


Wattage: 18000 watts


Fuel Type: Gasoline


Power Source: Fuel Powered


Recommended Uses For Product: Residential


Voltage: 120 Volts


Output Wattage: 18000


Special Feature: Portable


Included Components: Generator, Owner's manual


Color: No Finish


Brand: Generac


Wattage: 18000 watts


Fuel Type: Gasoline


Power Source: Fuel Powered


Recommended Uses For Product: Residential


Voltage: 120 Volts


Output Wattage: 18000


Special Feature: Portable


Included Components: Generator, Owner's manual


Color: No Finish


Product Dimensions: 58.5"L x 30.9"W x 36.5"H


Model Name: GP18000EFI


Engine Type: 816cc EFI Engine


Ignition System Type: Electronic


Tank Volume: 14.2 Imperial Gallons


Engine Displacement: 816 Cubic Centimeters


Total Power Outlets: 3


Starting Wattage: 22500 Watts


Running Wattage: 18000 Watts


UPC: 696471101324


Manufacturer: Generac


Item Weight: 427 pounds


Item model number: 8917


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Feb 24 – Mar 4

This item is non-returnable:

Non-returnable. Transportation of this item is subject to hazardous materials regulation

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • Efficient and Dependable Generator
Style: 10,000 Watts
Review Image by Marlon Smalling Marlon Smalling
Great value and easy to use This generator arrived well-packaged and was easy to set up right out of the box. It starts reliably and provides steady power for my basic needs. The noise level is reasonable for its size, and it feels solidly built. Overall, it does exactly what I expected and is a good value for the price. ... show more
Reviewed in the United States on December 13, 2025 by Marlon Smalling Marlon Smalling
    • Great Generator
Style: 10,000 Watts
Really great generator. Easy assembly, easy start. Used once after owning for several months and it ran great. Its not terribly loud compared to other brands. Would highly recommend.
Reviewed in the United States on November 26, 2025 by Aaron
    • A better piece of equipment
Style: 9,400 Watts
This is a much better piece of equipment than the ‘mass import’ companies offer. Smoother operation with negligible metal to metal noise. Much tighter operation. Just a better piece of equipment
Reviewed in the United States on December 26, 2025 by Bob W
    • Generac is unreliable
Style: 10,000 Watts
I have had this generator (10000/8500W) generator for about 4 months. Followed all the directions for setting it up, all of the directions getting it started and running including shutdown. Did a break in of the motor per the manual. First major storm of the season the generator would start up and run for a few minutes and would then shutdown. Tried it about 5 or 6 times and had the same thing happen. Checked to see if the carbon monoxide sensor was shutting down but it wasn’t. Tank was full of fuel, the right amount of oil. Checked to make sure I hadn’t done something wrong by reading the manual but everything should have been okay. Gave up and got out my 20 year old Onan generator that I wasn’t nearly as fastidious with and it started up and ran fine. Terrible waste of waste of money buying this Generac generator. When the Generac did run it would load up even when switching on a few lights, I couldn’t believe it. The Onan generator was roughly half the capacity and I never had any issues like that.. ... show more
Reviewed in the United States on December 19, 2025 by dps
    • Strong and reliable.
Style: 12,500 Watts Tri Fuel
Works as promised. Power to run my house, furnace and all. Very loud will have to take steps to mitigate some of the noise.
Reviewed in the United States on December 22, 2025 by jj23
    • Great product
Style: 10,000 Watts
Easy, great quality
Reviewed in the United States on December 25, 2025 by J
    • So far so good.
Style: 10,000 Watts
Review Image by Joe's son Joe's son
Arrived in good shape, installed the feet wheels and handle, and carefully moved it to the back yard. I put in some fresh gas connected the battery and was able to start it immediately. After it warmed up I put it under some load and it handled it without any hesitation. My last generator was 5500W so I'm hoping this one isn't pulled down from varying loads during a power outage like the old one. ... show more
Reviewed in the United States on December 22, 2025 by Joe's son Joe's son
    • Generac 10,000 Starting Watt Portable Gas Generator - Electric Start
Style: 10,000 Watts
Works great... got it on sale. Plenty of wattage for my refrigerator and freezer.
Reviewed in the United States on December 15, 2025 by Richard Mann

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