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    QuietSource 20-45 kW Liquid-Cooled Standby Generators

    Just because your home requires more power doesn’t mean you have to pay a whole lot more. Generac Power Systems has taken all of the leading-edge technologies from our industrial product line and applied them to our GUARDIAN QuietSource™ liquid-cooled products. Models range from 20-45 kW and cost thousands of dollars less than competitors’ units. They also feature automotive style, liquid-cooled engines, our exclusive patent-pending Whisper-Test™ feature and a corrosion-resistant aluminum enclosure option. You won’t find more affordable products with this kind of power.

    Industrial Power
    Our industrial grade automotive engines provide unmatched power and long life. If an engine is designed for a car to run hundreds of thousands of miles, just think how long a generator that never leaves your home will last!

    Whisper Quiet Operation
    GUARDIAN’s exclusive patent-pending Whisper-Test low speed exercise feature makes our GUARDIAN QuietSource™ systems the quietest liquid-cooled generators on the market. Whisper-Test reduces noise by 50% during the generator’s weekly automatic self-test cycle allowing for near silent operation that satisfies all known sound ordinances.

    Corrosion-Resistant Protection
    If you live near the coast or in an area with a lot of snow, you know how destructive salt and moisture can be. You can protect your standby power investment with a GUARDIAN QuietSource™ aluminum model. Our all aluminum enclosure provides corrosion-resistance that is far superior to anything else on the market.

    • Liquid-Cooled Engine: Produces more electricity for greater needs
    • Enclosure Options: Steel (tan) or corrosion-resistance aluminum (gray) for coastal communities
    • Whisper-Test™: Patent-pending, self-test feature makes the GUARDIAN QuietSource™ quieter than a central air conditioner
    • Superior Paint: Tough, textured powder coat paint finish for unmatched durability and all weather protection
    • UL Listed: For safety and certified power ratings UL Logo
    • Clean Burning Fuel: Natural gas or LPV

    Model (steel)
    Rated Power (kW) LP/NG 20/20 25/24 30/29 45/45 45/45
    (3 Phase Models available) Contact Dealer Contact Dealer Contact Dealer Contact Dealer Contact Dealer
    Voltage @ 60 Hz 240 240 240 240 240
    Phase Single Single Single Single Single
    Frequency 60 Hz 60 Hz 60 Hz 60 Hz 60 Hz
    Amps LP 83.3 104.2 125 187.5 187.5
    Amps NG 83.3 100 120 187.5 187.5
    Engine/Alternator RPM 3600 3600 3600 3600 3600
    Engine 1.6L/4 Cyl. 1.6L/4 Cyl. 1.6L/4 Cyl. 1.6L/4 Cyl. 1.6L/4 Cyl.
    Full Spec Sheet Spec Sheet Spec Sheet Spec Sheet Spec Sheet Spec Sheet
    Enclosure Steel Steel Steel Steel Steel
    Whisper Test Yes Yes Yes Yes Yes
    Automatic Transfer Switch (not included) RTS RTS RTS RTS RTS
    Sound Level (dBA @ exercise) 62 62 62 61 61
    Sound Level (dBA @ normal operation) 74 74 75 73 73
    Dimensions (L" x W" x H") 62x29x34 62x29x34 62x29x34 62x29x34 62x29x34
    Unit Wt. (lbs.) (steel/aluminum) 875 875 935 1414 1464
    Note: Prior to choosing a generator size, always check the appliance or equipment manufacturer's power requirements. This will help to ensure power accommodations for items that cycle during operation.