20kW1 Standby Generator with 200 Amp Automatic Transfer Switch

Model Number: 040346-00

Briggs & Stratton 20kW1 standby generators provide backup electricity for your air conditioner, appliances, lights, TVs or computers and give you the peace of mind to take charge. Ideal for large-sized homes, Briggs & Stratton standby generators can dependably power your home’s essential power needs with flexible power options. This backup generator comes with the best value warranty. Nobody else offers a 4-year limited warranty2 that includes both parts and labor!

MSRP: $4,499.00

Learn more about this unit (PDF)

PlugPlugPlugManaged Whole House Power

Do you want to power your essential items, but also have access to some additional high wattage appliances? Managed Whole House Power provides managed power to all of your high-wattage household appliances plus up to two air conditioners with our Load Control Center.

Product Ratings

  • Did you know that each week, 3.5 million Americans will experience a power outage in their home? Watch this video to learn about the benefits of owning a standby generator!

  • Reliable Engine Power

    Briggs & Stratton standby generators are powered by commercial-grade Vanguard™ engines that are design-engineered to dependably take on the most demanding jobs.

  • Flexible Placement3
    Tested against tough National Fire Protection Agency standards, Briggs & Stratton standby generators can be placed as close as 18” from the home providing more placement options in your yard – perfect for tight lot lines3.
  • Natural Gas Pressure Requirements

    Rated for operation in areas with low natural gas pressure. This standby generator can operate at 3.5'' to 7'' water column.

  • Durable Enclosure

    Designed to weather the elements, the system's enclosure is made from automotive-grade Galvanneal steel to resist rust. Its advanced powder coat paint process results in years of protection against chips and abrasions.

  • 4-Year Limited Warranty2

    Our 4-year warranty is the most comprehensive and customer-friendly in the industry. See for yourself.

  • Availability

    This standby generator is available for sale in all 50 states.

  • Package Includes
    200 Amp Automatic Transfer Switch
    Patented A/C Power Control Module to power up to two load dependent, air conditioners
    Installation Base
    Battery Charger
    Hour Meter

1This generator is rated in accordance with UL (Underwriters Laboratories) 2200 (stationary engine generator assemblies) and CSA (Canadian Standards Associations) C22.2 No. 100-04 (motors and generators).
2Warranty details available at
3Installations must strictly comply with all applicable codes, industry standards, laws, regulations and provided installation manual. Running engines give off carbon monoxide, an odorless, colorless, poisonous gas so it is important to keep exhaust gas away from any windows, doors, ventilation intakes or crawl spaces. The installation manual contains specific instructions related to generator placement in addition to NFPA 37, including the requirement that Carbon monoxide detectors be installed and maintained in your home.
4Review local codes to determine if a transfer switch with separate service disconnect is required.
Not for prime power or use where standby systems are legally required, for serious life safety or health hazards, or where lack of power, hampers rescue or fire-fighting operations.

  • Have a question? Search our FAQs to find answers related to model specifications, routine maintenance, repair or troubleshooting. Search FAQs »

  • Find genuine Briggs & Stratton repair and/or maintenance parts for your engine or outdoor power equipment to ensure future performance. Purchase Parts »

20kW1 Standby Generator with 200 Amp Automatic Transfer Switch
Running Watts (LP) 20,000
Running Watts (NG) 18,400
Engine Brand Briggs & Stratton
Engine Series Vanguard
CC 993
Operation Fully Automatic
Running Amps 83.3 (LP) 75.0 (NG)
Fuel Consumption (Cubic Feet per Hour @ 1/2 Load) 2.31 gal/hr (LP); 187 ft3/hr (NG)
Fuel Consumption (Cubic Feet per Hour @ Full Load) 3.75 gal/hr (LP); 260 ft3/hr (NG)
Overcrank Protection Yes
Length (in) 48
Width (in) 34
Height (in) 31
Weight (lbs) 500
Warranty (Product) 4 Year Parts and Labor

*NG = Natural Gas; LP = Liquid Propane. **Fuel consumption rates are estimated based on normal operating conditions at 1/2 load. Generator operation may be greatly affected by elevation and the cycling operation of multiple electrical appliances - fuel flow rates may vary depending on these factors.

Basic Wireless Monitor

Easy, trouble-free monitoring is a reality with the new Briggs & Stratton Basic Wireless Monitor. Place the wireless monitor in your home and know your generator is working without ever having to go outside.

16-20kW1 Cold Weather Kit Help ensure smooth starting and reliable operation in the winter months with the Briggs & Stratton Cold Weather Kit tested to start at -25° F. The thermostatically controlled battery warmers and oil heaters activate as the temperature drops. Each kit includes a battery warmer and two oil heaters. View Generator Accessory
16-20kW1 Maintenance Kit Briggs & Stratton maintenance kits help you complete scheduled maintenance and prevent costly repairs on your standby generator. Maintenance kits are designed specifically for your generator’s needs. Each maintenance kit contains air and oil filters, synthetic oil, and spark plugs for your model. View Generator Accessory
10-20kW1 Load Control Center

Used in addition to your transfer switch, this upgrade allows you to manage the power demands of multiple high wattage appliances, while the generator continues to power the essential loads throughout your home.

200 Amp Automatic Transfer Switch

200 Amp Automatic Transfer Switch

The 200 amp automatic transfer switch provides power to more of your household appliances. Featuring our patented Air Conditioning Control Module (ACCM), the 200 amp automatic transfer switch manages the load of 1 or 2 air conditioners while keeping household appliances powered. Flexible, indoor/outdoor transfer switch placement makes it …

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