Memorial Day / Shavuot Holiday Closing Friday & Monday May 26 - 29 [See Details for More]

Our store will be closed for the Holiday. You can always place your orders online and they will be processed as usual when our office reopens. Alternatively you may email your requests and we will get back to them in a timely manner.

We appreciate your patience as we return to our regular operations schedule.


    Generac 7040 20/18kW Air-Cooled Standby Generator *DISCONTINUED*

    By Generac | Mfr#: 7040 | Tiger#: TS35209
    • Generac 20/18kW Air-Cooled Standby Generator GEN7038-
    • Generac 20/18kW Air-Cooled Standby Generator 7038
    • Generac 20/18kW Air-Cooled Standby Generator with Switch


    • Maximum continuous power: 20,000 or 18,000 watts
    • Optional 200 Amp transfer switch
    • Dual fuel type: Natural Gas or Liquid Propane
    • True Power Technology for quick connection
    • 999cc OHV (OverHead Valve) engine
    • Certifications: UL, CUL, EPA
    • Aluminum enclosure
    • LCD screen to monitor the status
    More Product Details What's Included
    • Product Options
    Availability:Out Of Stock
    Ships Out Within: Discontinued
    Tiger Supplies no longer carries this item

    California Proposition 65 WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and reproductive harm. For more information go to

    Overview for Generac 7040 20/18kW Air-Cooled Standby Generator

    The Generac 20/18kW Air-Cooled Standby Generator is a dependable and intense home power backup. Its 999cc OHV motor handles the Magnetoelectronic starting method that highlights a reliable quick startup that works superbly with its full pressure lubrication method for longer engine performance. The motor has less than 5% of total harmonic distortion, creating a consistent and adequate power supply for home appliances. This automatic standby generator offers a power capacity of 20,000 watts for Liquid Propane and 18,000 watts for Natural Gas.

    The Generac 20/18kW home backup generator has a choice of 200 Amp service rated smart switch. It has an LCD screen with LED indicators for easy monitoring of fuel level, battery, and track maintenance intervals. The air-cooled standby generator has great engine features like the high temperature and low oil level shutdown that protect the engine to avoid damage.

    The panels of this generator are made from strong aluminum, keeping it well protected from weather conditions such as rain and sunlight, it is also resistant to corrosion. It is certified by UL, EPA, and CUL to provide safety for operators and protection for the environment. In addition, Generac has 24/7 customer service, it also comes with a 5-year limited warranty.

    Configuration Options

    The Generac 20/18kW Air-Cooled Standby Generator comes in four packages with an option for a transfer switch. Select your preference from the drop-down menu above.

    • 7038: No Transfer Switch; UL/EPA/CUL Certified
    • 7039: With 200 Amp Service Rated Smart Switch; UL/EPA/Non-CUL Compliant
    • 7040: With 200 Amp Service Rated Smart Switch with Mobile Link; UL/EPA/Non-CUL Compliant
    • 7041: With 200 Amp Non-Service Rated Smart Switch; UL/EPA/CUL Certified

    The 200-Amp Service Rated Switch is an electrically operated switch rated for all classes of load both inductive and resistive. It follows the standard of Digital Power Management (DPM) technology for added safety. The enclosure is NEMA/UL3R rated aluminum enclosure great for harsh weather conditions. 


    UL. The Underwriters Laboratories Inc. (UL) is the leading and trusted product safety accreditor in the United States. UL is recognized as the organization for the health and safety testing of machines and other industrial equipment.

    EPA. The United States Environmental Protection Agency (EPA or USEPA) is from the federal government of the United States which regulates and ensures the protection of both human health and the environment.

    CUL. The Canadian Electrical Code (CUL) certification ensures that the equipment has been tested thoroughly and has passed the requirements issued by the CSA or Canadian Standards Association. The engines under this certification are suitable for use in Canada.

    Specifications (LP/NG)


    10/9 kW


    13/13 kW


    16/16 kW


    20/18 kW


    22/19.5 kW

    100 Amp Transfer SwitchYesYesYes--
    200 Amp Service Rated Smart Switch-YesYesYesYes
    Voltage (Single Phase)120/240V120/240V120/240V120/240V120/240V
    Amps @ 240V LP/NG41.7 / 37.554.2 / 54.266.6 / 66.283.3 / 7591.6 / 81.3
    Engine / Alternator RPM3,6003,6003,6003,6003,600
    EngineGenerac G-ForceGenerac G-ForceGenerac G-ForceGenerac G-ForceGenerac G-Force
    Engine Displacement460cc816cc816cc999cc999cc
    Fuel Consumption @ 100% Load NG cu. ft/hr127225245301327
    Fuel Consumption @ 100% Load LPG gal/hr1.482.452.993.563.90
    Quiet Test ModeYesYesYesYesYes
    Dimensions (L x W x H)48" x 25" x 29"48" x 25" x 29"48" x 25" x 29"48" x 25" x 29"48" x 25" x 29"
    Weight (lbs.)338385420448466
    Standard with Mobile LinkYesYesYesYesYes