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Generac iQ3500 vs GP3500iO - The Differences

Further down the page, you'll find some explanations regarding the key similarities and differences between the Generac GP3500iO and the Generac iQ3500.

But before checking out explanations regarding their power, portability, and features, here's a table that summarizes the main pros of each of these 2 generators:

Generac GP3500iOGenerac iQ3500
Generac GP3500iOGenerac iQ3500
  • Less bulky
  • Lighter
  • Higher runtime
  • Lower fuel consumption
  • Double handle
  • Electric start
  • Fuel gauge
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As the GP3500iO and the iQ3500 are both Generac generators, they benefit from the same level of quality and attention to detail.

Power Comparison

The following charts are provided to show you at a glance how the main specs of the Generac GP3500iO compare to the Generac iQ3500.

  • Power: As both the Generac GP3500iO and the Generac iQ3500 share the same running wattage of 3000W, they will both allow you to simultaneously power the same appliances. In addition, as the 2 generators have the same starting watts (3500 W), they will both give you the same boost needed to start the motor of your most demanding appliances.
  • Runtime: When loaded to 25% of their max capacity, the iQ3500 offers a higher runtime on a full tank than the GP3500iO: it can operate for up to 14.1 hours, whereas the GP3500iO offers a maximum runtime of 11 hours.
  • Fuel Efficiency: With a gasoline consumption at 25% load of 0.18 GPH (gallon per hour), the iQ3500 is more fuel efficient than the Generac GP3500iO and its 0.22 GPH. The former's operation will therefore cost less in terms of the money spent on gasoline. Inverter generators like these 2 are of the most fuel efficient (and quiet) type.
  • THD: Both generators offer a low THD (<3% for the Generac GP3500iO and <3% for the Generac iQ3500) and are therefore perfectly suitable to safely power your sensitive electronic devices.

Portability Comparison

  • Bulkiness: With dimensions of L19.3" x W16.9" x H16.4", the Generac GP3500iO offers a much more compact experience of power generation than the Generac iQ3500 and its L23.7" x W18" x H21.7".
  • Weight: Weighing 74.3 lbs, the GP3500iO is much lighter than the 109.1 lbs of the iQ3500.
  • Portability: To the contrary of the GP3500iO, the iQ3500 benefits from a double handle, to help you get a better grip anytime you wish to move your portable generator.

Feature Comparison

  • Starting System: While these two devices can both start thanks to a conventional pull-start mechanism, the Generac iQ3500 has the advantage of also being able to get running via a convenient electric starter.
  • Outlets: The GP3500iO and the iQ3500 both offer 3 AC outlets. None of them feature GFCI outlets. Both of them also feature a DC output. For more detailed information regarding all their respective receptacles, refer to the GP3500iO's and the iQ3500's product pages.
  • Data Center & Fuel Gauge: Each of these 2 portable generators is equipped with a data center allowing you to conveniently monitor some aspects of the power output. Besides that, thanks to the digital fuel fauge provided by its data center, the Generac iQ3500 provides instant visibility of the fuel level.

TL;DR

Generac GP3500iOGenerac iQ3500
Generac GP3500iOGenerac iQ3500
  • Less bulky
  • Lighter
  • Higher runtime
  • Lower fuel consumption
  • Double handle
  • Electric start
  • Fuel gauge
Show all offers
Show all offers
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You can compare as many generators as you wish. However, for the best results, we recommend you to compare only 2 generators at a time.

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