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Model # RS20-C2100
MSRP: $6,134.00
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Avg. Product Review Rating: 5.0/5 (based on 3 reviews - read reviews) Write a Review - $10 Store Credit

Cummins 20kW NG/LP Standby Generator Cold Weather Package with 200 Amp SE ATS and 2 100 Ft Install Harnesses RS20 C2100

  • Very quiet operation
  • Internet remote monitoring and email notification
  • Automatic load management - The intelligent generator control automatically manages non-essential household loads for maximum utilization of generator power
  • Cold weather equipped for temperatures to -20 F
  • Designed alternator and electronic control
  • Starts and runs a 5 ton A/C under full pre-load
  • GFCI Ready
  • Self-diagnostic capability
  • Service & maintenance viewable on the in home display
  • Easy installation with innovative molded polymer installation base - no need for a concrete pad
  • Package Includes 200 Amp Automatic, Outdoor Rated, Service Rated Automatic Transfer Switch, Two 100 ft Installation Harnesses, In Home/Remote Display Monitor
  • Commercial/Consumer Warranty: 5 Year or 2000 Hour Limited


Cummins Power Generation RS20-C2100 Details and Specifications

Cummins Power Generation 20kW NG/LP Standby Generator Cold Weather Package with 200 Amp Automatic Service Entrance Rated Transfer Switch. Package also includes Remote In-Home Display and (2) 100 Ft. Installation Harnesses

EPA and CARB Emissions compliant models for California available upon request, no extra charge.

Comfort, Security and Convenience are the things you can depend on with a Cummins Residential Standby Generator...just in case the power goes out. With power outages occurring more and more frequently, it is good to be prepared. A Cummins Standby Generator can give you peace of mind and the ability to live your busy life, uninterrupted.

Generator Model 20GSBB-6714Features:

Very Quiet Operation

Internet remote monitoring and email notification, with the included In-Home Display

Load Management: Automatically turns on/off loads to prevent generator overload. Easy to set up from In-Home Display - INCLUDED. Easily connected at the generator.

Cummins designed alternator and electronic control

Powerful motor starting - starts and runs a 5 ton A/C under full pre-load

Self-diagnostic capability, Programmable Exerciser

Service and maintenance information displayed on the included In-Home Display

Easy installation with innovative molded polymer installation base - no need for a concrete pad.

Electronic Governor for precise frequency control

Flexible 12 inch fuel line provided with genset

Generator designed and manufactured in the USA.

Cold weather equipped for temperatures below 32 degrees

U.S. EPA Emissions Certified

UL 2200 Listed and CSA Certified

5 Year, 2000 Hour Limited Manufactures Warranty

Transfer Switch Model RSS200-6869 Features:

200 Amp, Nema 3R (Outdoor Rated), Service Entrance Rated

Fully automatic control, selectable exercise at repeatable intervals.

Integrated, automatic 2 amp regulated battery charger.

Independent break-before-make action

UL Listed

Includes (2) 100 Ft Installation Harnesses:

p/n A029U303 Easy plug-n-play harness connects low voltage wiring between generator and transfer switch.


p/n A029U310 Easy plug-n-play connection from remote display to RS air-cooled generators. Color coded for easy installation.

Product Specifications

Model Number RS20-C2100
Manufacturer Cummins Power Generation
Made In USA Yes
Rated Watts 20kW
Rated Amps 81 Amps
Voltage 120/240V Single Phase
A/C Ton Rating 5 Ton
Enclosure Aluminum
UL Listed Yes
Decibel Rating 62
Starting System Automatic Start
Low Oil Alert Yes
Hour Meter Yes
Battery Requirement 12V, Group 26R, 545 CCA
Mounting Pad Composite Base Attached
Product Weight 540 lbs
Dimensions (Inches) 53L x 43W x 34.7H
Engine Brand Cummins Designed
Engine Size 993cc, OHV V-Twin
Engine RPM 3600
Cooling System Air Cooled
Alternator Type Brushed
Frequency 60 Hz
Auto Voltage Regulation Yes
Fuel Type Natural Gas (NG) / Propane (LP)
NG Power Capacity 18kW
LP Power Capacity 20kW
NG Consumption @ Full Load 240 cu.ft/hr
NG Consumption @ 1/2 Load 135 cu.ft/hr
LP Consumption @ Full Load 3.0 gal/hr
LP Consumption @ 1/2 Load 1.5 gal/hr
Transfer Switch
Transfer Switch Model RSS200-6869 Automatic
Transfer Switch Amps 200 Amps
Transfer Switch Circuits Whole Service
ATS Poles 2 Pole
Warranty Information
Consumer Warranty 5 Year/2000 Hour Limited
Shipping Weight 715 lbs
Shipping Dimensions 64H x 55W x 48D
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Product Reviews

  1. Definately Worth the Extra Money

    Posted by Carl P. on 12th Nov 2014

    I've installed other brand units for people I know and was never very impressed with the quality of them, especially the Generac's. My wife and I are building a new house out in the middle of farm country and did a lot of research before ordering one. When it arrived on the truck, the first thing I was impressed with was how well it was crated up. Even the delivery guy couldn't believe all the 1x4's and how stout the crate was. Once it was unpacked and I started to look the unit over, I was very impressed with how well it was made. I am an engineer by trade and everything was well thought out from the cabinetry, the intake/exhaust through the top of the hood, the serviceability, the quality of the materials, the transfer switch, etc. The installation instructions are a little to be desired for the do it yourselfer, but it was probably one of the cleanest installs I've done. The unit is so quiet, I can't even hear it running unless I open a window and stick my head outside. Switchover is seamless and the power generation is superb without any flickering as loads are applied.

  2. 20kw Cummins Onan Is Worth The Money

    Posted by John M. on 10th Aug 2014

    I purchased after lots of research. I was tired of dragging out the portable one from the garage. I chose this one for the ability to turn it on and off from inside the house and that I was able to find a Cummins rep to repair it if needed. I am very happy with it, it was not hard to do some of the install myself, I dug the line and set the electrical pipes in place. I even pulled the wire through. I had an electrician do the final hook up and a gas company do the final connection to LP. They were both surprised how quite this generator is compared to others, it sounds as quite as an air conditioner. In 9 months it has come on a couple of times with no issues, I didn't even know it turned on. I would recommend you check over the generator very carefully for damage even if it is in clear packaging. Mine had a crack in the top from the delivery team i did not see, the good news is UPS made good on this and gave me the money for a new top. You get what you pay for with this generator, easy to use and easy to access the inside for routine maintenance, the communication cables that it came with were very convenient. I am very happy.

  3. Absolutely the Best

    Posted by Tony on 21st Oct 2012

    When I researched the purchase of a home standby generator, I was concerned about three things. Efficiency, sound level and warranty. The Cummins Onan unit excelled in all three catagories, The price is a bit more than the competition, but the advantages are huge. The installers could not believe how quite it is and how quickly it starts and provides electricity. The Onan se switch is made with high level components - not usual with the competition. The indoor monitoring control is simple and easy to use. The low sound level is astonishing - my neighbors Generac across the street drowns out my unit when when they are both exercising. I would gladly do a free commercial for Cummins Onan for this unit.

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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.

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