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Model # RS20-C250
MSRP: $5,931.00
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Avg. Product Review Rating: 4.8/5 (based on 6 reviews - read reviews) Write a Review - $10 Store Credit

Cummins 20kW NG/LP Standby Generator Cold Weather Package with 200 Amp Automatic SE Rated Transfer Switch RS20 C250

  • 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 0 F, Additional equipment available for temperatures below 0 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 - no need for a concrete pad
  • Package Includes 200 Amp Automatic, Outdoor Rated, Service Rated Automatic Transfer Switch, Two 50 ft Installation Harnesses, In Home/Remote Display Monitor
  • Commercial/Consumer Warranty: 5 Year or 2000 Hour Limited


Cummins Power Generation RS20-C250 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) 50 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-6714


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) 50 Ft Installation Harnesses:

p/n A029U302 Easy plug-n-play harness connects low voltage wiring between generator and transfer switch.


p/n A029U308 Easy plug-n-play connection from remote display to RS air-cooled generators. Color coded for easy installation.

Product Specifications

Model Number RS20-C250
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
Transfer Switch Weight 58 lbs
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. Never disappointed with the best

    Posted by Paul on 17th Sep 2014

    Looked at all others and decided to purchase this one. Costs more but well worth it. Quiet/well built/easy to install. Lost power within 4 hours of installing and this generator clicked on almost instantly. I could hear my neighbors generator noise over this one and I was standing next to it.

  2. Excellent product

    Posted by Unknown on 14th Aug 2013

    Ordered from Norwall and was very pleased with customer service who provided advice throughout delivery and installation. The genset shipped very quickly, although actual delivery to the site was delayed by about a week due to the freight company's shuttling between a "hub" and "distribution center" and then back to the "hub" before they finally delivered.

    Installed the genset myself and installed the transfer switch with the help of a licensed electrician (power company requirement). The installation went very smoothly and the integrated pad saved me time and money by not having to pour concrete. The electrician commented several times how impressed he was with the quality of the transfer switch and the entire setup.

    The generator has functioned flawlessly during several power outages. It is so quiet that you may not know that it's in use unless you are outside near the genset or standing near the control panel.

    I cannot comment about the web interface as there is no connection at this site.

  3. Now selling and installing these.

    Posted by Steve Hollander on 1st Aug 2013

    I find this to be the most user friendly unit to install and program.

  4. Quiet and reliable standby power for most medium to large homes.

    Posted by Steve Hollander on 1st Aug 2013

    This is one of the finest generators on the market today for homeowners in the affordable range.

  5. Generator works fine but web and email interface is poor at best

    Posted by Mitch G on 27th Jun 2013

    The generator is very quiet compared to others generators I have seen. It does the job it is intended to do. However the Ethernet port resets constantly causing the browser to not connect properly or lose connection while you are attempting to use the web interface. Sometimes you get weird looking pages et. The email setup is poor. For example the field “user name” is used for both logon and from email address. So if your server requires a login name that is different than the from address i.e. user@domain.com the system will not work. Further it is plain smtp and not able to do any ssl or encryption on the net leaving the email ripe for hacking. Make sure you set up a special from email just for the generator. Also I am not happy with the way load shedding is designed. If I have 2 loads let’s say 2 Air Conditioner units on the load shedding if they both come on and usage is 95% it will shut both off and after 2 tries never turn them on again without manual intervention. It would be nice if you could have them cycle each load for a specific amount of time so one load would be on at a time as reasonably demanded.
    I have heard there are issues with it and Windows 8 but I could not duplicate them
    BTW I own one of the oldest microcomputer consulting firms in the USA

  6. Performs excellent

    Posted by Joseph J. Z on 5th Feb 2013

    After Sandy I knew we needed a backup in the event of another storm. I was surprised at the number of trees that had fallen and the big job that had to be done by LIPA. This generator was hooked up as directed by a licensed electrician and plumber and they were amazed as I on how quiet and smooth running the generator is. We have lost electricity only once since it has been hooked up. Did not hear anything until I opened the window and saw it working beautifully. I would recommend this generator to everyone for its reliability and craftsmanship.

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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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