The Most Powerful and Fuel Efficient Generator in its Class
Generac’s newest addition to the Guardian product lineup is the largest capacity air-cooled standby generator on the market. No other generator manufacturer currently offers a comparable air-cooled standby unit. The propane and natural gas generator supplies up to 22 kilowatts of power while running on LP and 19.5 kilowatts on natural gas while using less fuel than similar units with a smaller capacity.
Did You Know?
Generac Guardian Propane and Natural Gas Generators for Home Use are the most popular home standby generator in the country. The new 22kW Guardian is more powerful and more efficient than any other home backup generator available.
The Right Fuel for Your Home Standby Generator
Fuel Efficiency
A glance at the specifications for the 22-Kilowatt Generac Guardian 70432 which provides a side-by-side comparison of Generac’s 16, 20, and 22 kilowatt Guardian generators, shows the 22kW uses less natural gas at either half load or full load than either the 20 kW or the 16kW and still generates more power. LP consumption is just slightly higher than the 16 and 20 kilowatt models at half load, and less than the 20 kilowatt at full load, but the fuel used per kilowatt of electricity produced is much lower for both fuels under any load condition.
| Natural Gas (ft³/hr) | 50% Load | Efficiency | 100% Load | Efficiency |
| 16kW | 193 | 24.1 ft/kW | 312 | 19.5 ft/kW |
| 20kW | 205 | 20.5 ft/kW | 308 | 16.4 ft/kW |
| 22kW | 184 | 16.7 ft/kW | 281 | 12.7 ft/kW |
| Natural Gas (ft³/hr) | 50% Load | Efficiency | 100% Load | Efficiency |
| 16kW | 1.99 | 0.25 gal/kW | 3.57 | 0.22 gal/kW |
| 20kW | 2.08 | 0.21 gal/kW | 3.85 | 0.19 gal/kW |
| 22kW | 2.16 | 0.20 gal/kw | 3.67 | 0.17 gal/kW |
Generac points to three design changes that improved efficiency. A better fuel delivery system, engine modifications, and the use of low-loss steel in the unit’s alternator—the component that generates electricity. Low-loss steel is an alloy that reduces electrical losses and improves the efficiency of motors, generators, and transformers.
Generac Guardian Features and Benefits
22 Kilowatt Models
Norwall Power Systems offers the 22kW in two packages:
- Guardian 70422 includes only the standby generator.
- Guardian 70432 adds a 200-Amp Generac Smart Switch.
The Smart Switch included with the 70432 is an automatic transfer switch (RXSW200A3) rated for use as a 200-amp service entrance and equipped for whole house managed power.
New to the 22-kilowatt models is a reduced exercise cycle of just five minutes, programmable to run on a weekly, bi-weekly, or monthly schedule.
Generac Digital Power Management technology and a Generac Smart Switch ATS manage two central air conditioners without additional hardware. The addition of a PMM starter kit and Power Management Modules allows the switch to manage up to four additional high-voltage, high-current loads such as an electric hot water heater, well pump, or electric dryer. Digital Power Management prevents overload conditions while allowing the generator to power multiple heavy loads, all while keeping your home cool and the lights on.
Home Standby Generators and Power Management
Guardian Standby Features
The Guardian standby models come equipped with True Power technology. Utility-quality power that meets the needs of motors, appliances, and sensitive electronics. Less than 5% total harmonic distortion of the AC signal and voltage regulation within 1%, even under heavy load.
Compliance with National Fire Codes allows installation within 18 inches of the home, subject to local regulation and the location of nearby vents, windows, and doors.
A compact and attractive design, all-weather aluminum enclosure and quiet operation makes the 22kW unit practical in any residential setting. At 68dB, these generators produce noise that is lower than the average residential central A/C unit.
Generac’s intuitive Evolution Controller has a two line display and an easy to read back-lit keypad. With an optional basic or advanced wireless monitor, the controller is accessible inside the home. Built In Mobile Link Monitoring provides controller access from anywhere in the world with a smartphone, tablet, PC, or Laptop.
Covered by Generac’s 5-year limited consumer warranty.
Shop the Generac Generator Catalog at Norwall PowerSystems
Updated June 17, 2020
