Loading... Please wait...
Call Toll-Free 855-453-4494

Model # RS20L-100DF
MSRP: $9,515.00
You Save: $427.00


Login to Norwall

Or Add to Wish List

Product Information PDFs

Previously Viewed Products

Whoa! No review on this Product

Be the first to review this product and earn a chance for a $10 store credit when you place a review on this product post purchase.

Cummins Onan 20kW LP/NG Liquid Cooled Standby Generator with 100 Amp Automatic Transfer Switch RS20L 100DF

  • Very quite operation
  • Aluminum weather resistant housing
  • Available for use with natural gas or LP vapor
  • Includes 100 Amp Automatic Transfer Switch, NEMA 3
  • Includes programmable exerciser
  • Includes integrated battery charger
  • Attractive and discreet housing
  • Electronic governor for precise frequency control
  • Includes 120 V coolant heater
  • Listed to UL 2200
  • 12 lead re-connectable alternator
  • Low coolant shutdown
  • 2 year warranty

Bookmark and Share

Details and Specifications

Cummins Onan 20kW Propane or Natural Gas Fueled Liquid Cooled Standby Generator

Cummins Onan RS Series 20,000 Watt Propane or Natural Gas Fueled Liquid Cooled Standby Generator offers many features, a fully weather protective enclosure, significantly quieter operation, comes on automatically when you need it and shuts down automatically once main power is restored.  Comfort, security and convenience are things you can depend on with a Cummins Onan standby generator - just in case the power goes out.


Cummins Onan RS 20kW Generator Model 20GGMA

• Very quiet operation
• Aluminum weather resistant housing
• Fully automatic operation when used with a Cummins Onan automatic transfer panel
• Atractive and discreet housing
• Electronic governor for precise frequency control
• Includes 120V coolant heater
• Low coolant shutdown
• 2 Year Warranty

U.S. EPA and CARB Emissions compliant for use in all 50 states.
UL 2200 Listed


• RSS100-6634 Cummins Onan 100 Amp Automatic Transfer Switch, outdoor rated (Nema 3R), programmable exerciser and integrated battery charger.

Warranty Information

Manufactures Warranty: 2 Years

Product Specifications

Model Number RS20L-100DF
Manufacturer Cummins Onan
Made In USA Yes
Rated Watts 20kW
Rated Amps 83 Amps
Voltage 120/240V Single Phase
A/C Ton Rating 5 Ton
Enclosure Aluminum
UL Listed Yes
Decibel Rating 66 db(A)
Starting System Automatic
Low Oil Alert Yes
Hour Meter Yes
Mounting Pad Requires a Prepared Site
Product Weight 1105 lbs
Dimensions (Inches) 64.4L x 30W x 46.7H
Engine Brand GM Industrial
Engine Size 3.0L
Engine RPM 1800 RPM
Cooling System Liquid Cooled
Alternator Type Brushless
Frequency 60 Hz
Auto Voltage Regulation Yes
Fuel Type Natural Gas/LP (Propane)
NG Power Capacity 20kW
LP Power Capacity 20kW
NG Consumption @ Full Load 298 cu.ft/hr
NG Consumption @ 1/2 Load 203 cu.ft/hr
LP Consumption @ Full Load 3.2 gal/hr or 116 cu.ft/hr
LP Consumption @ 1/2 Load 2.2 gal/hr or 78.8 cu.ft/hr
Transfer Switch
Transfer Switch Model RSS100-6634
Transfer Switch Amps 100 Amps
Transfer Switch Circuits Whole Panel - Outdoor Rated
ATS Poles 2 Pole
Warranty Information
Consumer Warranty 2 Year Limited
You need to be logged in to write a review.
Write A Review

Product Reviews

This product hasn't received any reviews yet. Be the first to review this product!

LAYAWAY Available Now

Shipping Terms

All generators include 24 hour delivery notification and residential delivery. Liftgate service is available on all air-cooled generators and some liquid cooled units – Please call for verification. Free Shipping is curbside service only. Curbside service means the freight company will deliver to your address and lower your generator to the ground. The freight company will not back down driveways, place a generator in a building or where it is being installed. You are responsible for arranging the movement and setting of the generator.

Some restrictions apply to "Free Shipping" you may either view our
Shipping Information page or contact us for details.