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Generac 6551 22kW Watt Review

generac 6551 review

The Generac Guardian 6551 22kW generator is the largest air-cooled home standby generator. It runs on natural gas or liquid propane (LP) gas, and sits outside just like a central air conditioning unit. It is designed to run for extended periods, ensuring reliable, uninterrupted power. The machine is equipped with a ground-fault circuit interrupter, which is designed to protect users from electric shocks.

OHVI Engine

The Guardian Series generator might have to get you through days without utility power. It is specifically designed for generator use which provides the reliability to power through the most severe outages.

True Power

It has the best power quality with less than 5% harmonic distortion which means clean, smooth operation of your sensitive electronics and appliances.

Easy Installation

The Generac 22kW generator is easy to install when combined with a pre-wired transfer switch or Smart Switch, re-engineered connection points, and composite mounting pad that eliminates the need for a poured concrete base (unless specified by local codes).

Rated for Operation in Areas with Low Natural Gas Pressure

In areas with low natural gas pressure, the Generac 22kW generator can operate on natural gas pressures of only 3.5” of water column.

All Weather Aluminum Enclosure

The durable powder-coat finish helps make the sturdy, all-weather aluminum enclosure corrosion resistant, making it ideal for coastal and salt-air climates. It is also able to withstand winds of up to 150 mph.

Quick and Quiet Exercise Test

The standby generator requires a short run-time periodically, known as exercise, to test and ensure the system is functioning properly and ready for an emergency. This whole house generator’s self-test runs for only twelve minutes.


  • Starts automatically for 24/7 backup power protection
  • Easy to switch between natural gas and LP fuel without any need for tools
  • It is durable and strong
  • It has a quality build and design


  • Needs to be professionally installed
  • Can be a little noisy


Gain up to whole-house coverage through smart power management. The process is simple, non-essential circuits are shed when the generator approaches maximum capacity to eliminate overload, then are cycled back on when essential circuits are satisfied. It features a dual-line, improved multilingual LCD display for easy monitoring and management of generator functions, built-in hour meter and external at-a-glance indicator lights. The standby generator delivers power directly to your home’s electrical system, backing up your entire home or just the most essential items.

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