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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
Condition: New
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Availability: Only 1 left in stock, order soon!
Fulfilled by Voomi Supply

Arrives Jun 27 – Jun 29
Order within 7 hours and 12 minutes
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Style: 22,500 Starting 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


Wattage: 18000 watts


Fuel Type: Gasoline


Power Source: Fuel Powered


Recommended Uses For Product: Residential


Voltage: 120 Volts


Output Wattage: 18000


Additional Features: Portable


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


Frequency: 50 Hz


Runtime: 9 hours


Color: No Finish


Brand Name: Generac


Included Components: Generator, Owner's manual


Model Name: GP18000EFI


Model Number: 8917


UPC: 696471101324


Manufacturer: Generac


Manufacturer Part Number: GP18000EFI


Unit Count: 1.0 Count


Item Type Name: Portable Generator


Warranty Description: 3-year residential warranty


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


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Jun 27 – Jun 29

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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

Learn more about financing & leasing here.

Top Amazon Reviews


  • Excellent
Style: 19,300 Starting Watts
Used daily for our business It's loud but easy to use. We use non-ethenol fuel in it & change the oil before the recommended & have had no issues. Have almost 500hrs on it. Quality is good, runs well. I wish it were cheaper, but compared to others it's in the money. We had a duramax prior & it didn't run well & ended up frying our equipment. This one is OK for electronics. Would recommend ... show more
Reviewed in the United States on December 22, 2024 by Amazon Customer

  • Excellent generator for a very good price!
Style: 22,500 Starting Watts
This is a excellent generator that can handle most applications and it’s relatively simple to use fairly low noise levels
Reviewed in the United States on August 24, 2025 by Thomas Quigley

  • Won't even start
Style: 19,300 Starting Watts
I had a bad experience with Amazon after buying this. The first machine that was delivered had a massive dent in the fuel tank where it had clearly been dropped onto the ground from a height. I only found that out after unboxing (something that takes an hour because it's in a crate). I contacted Amazon who did arrange to have it replaced. When the new one arrived, it won't even start. There is something fundamentally wrong with it - the battery is good, it has correct fuel, etc. but the starter motor won't turn over. The local dealer don't know what is wrong with it and Generac are no help at all. ... show more
Reviewed in the United States on November 7, 2025 by Saperlo

  • Great product for value paid.
Style: 19,300 Starting Watts
Great product for the value paid. Easy to start, easy to set-up.
Reviewed in the United States on August 9, 2025 by JWH

  • Parts Missing
Style: 19,300 Starting Watts
I like the build quality. I'm currently breaking in the generator, runs great. Made in USA definitely a plus. Value for the money spent is good compared to overseas models. The issue is that the axle for the wheel kit is missing from the wheel kit box. You'd expect better quality checking before shipping. Currently have been on hold w/ Generac support 25 min. I got a very nice girl to help me with this issue, so we'll see how good the support is. I'm getting the axle @ N/C under warranty. The drag is the 7-10 business days for shipping because Generac doesn't expedite shipping. UPDATE: Generac did UPS me an axle kinda quick, so kudos to them for that. Generator is running fine so far for 10hrs on brake in, only glitch was having to reset spark plug gap to proper .030 as it started to sputter a little. Spark plugs are gapped wrong from factory @ .018. I'm a auto tech so not a big deal. So far I would recommend this unit. It is well built, not bad on fuel so far & I'm picky. Also I like the fact it has AVR instead of capacitor regulation. Better for electronics. ... show more
Reviewed in the United States on October 28, 2024 by Begeiled

  • A1 Top Shelf Portable Generator
Style: 22,500 Starting Watts
Best portable generator I've ever seen, much less owned. This hoss gets er done. Best investment so far for me this year.
Reviewed in the United States on February 10, 2025 by Bryan Morgan

  • Powerful generator
Style: 22,500 Starting Watts
Runs our 2500 sqft house and a 5ton a/c unit.
Reviewed in the United States on September 13, 2024 by Juan Doblado

  • Serious manufacture equipment defects and warranty process experience terrible so far Serious manufacture equipment defects and warranty process experience terrible so far
Style: 22,500 Starting Watts
Does not meet expectation, serious manufacture equipment defects and warranty process experience terrible so far. Fuel tank collapsed under vacuum after equipment ran for 6hrs. There is no adjustable feature to control fuel tank ventilation meaning this issue can only be caused by manufacture equipment defects. ... show more
Reviewed in the United States on February 12, 2026 Reviewed in the United States on February 12, 2026 by Glen

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