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Model # 20RESA-QS2
MSRP: $5,089.00
You Save: $1,092.00


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Kohler 20RESA QS2 20kW Air Cooled Generator with 100% Corrosion-Proof Enclosure

  • High Quality Power Kohler provides advanced voltage and frequency regulation along with ultra-low levels of harmonic distortion for excellent generator power quality
  • Extraordinary Reliability 5-year or 2000 hour warranty
  • Powerful Performance Exclusive Power boost technology provides excellent starting power
  • Exclusive 100% Corrosion-Proof Enclosure
  • Fast Response Kohler's unique Fast-Response excitation system delivers excellent voltage response and short-circuit capability
  • Quiet Operation Kohler home generators provide quiet, neighborhood friendly performance

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Details and Specifications

Kohler 20kW Air Cooled Standby Generator

"The Kohler Advantage"

  • Best-in-Class Power Quality
  • Extraordinary Reliability
  • Powerful Performance
  • Exclusive 100% Corrosion-Proof Enclosure
  • Faster Response
  • Quiet Operation

Automatic, hands-off operation
In the event of a utility power outage, the transfer switch - working in tandem with the generator - automatically starts the generator to restore power to the home, whether you're home or away.

Fast backup power
KOHLER home standby generators restore power within 10 seconds of an outage.

Standard Features:

  • RDC2 Controller - One digital controller manages both the generator and Model RXT transfer switch functions, has a two-line backlit LCD display with adjustable contrast
  • Displays 70 diagnostic messages for the engine, generator, Model RXT transfer switch and any controller accessories you add-on (PIM or LCM).
  • Programmable exerciser - any day, any time for once a week or every two weeks, when used with a Model RXT transfer switch.
  • Designed for today's most sophisticated electronics, Extraordinary Reliability!
  • Multi-Fuel System - LP Vapor (Propane) or Natural Gas, Field Convertible.
  • Kohler Command PRO Engine for Powerful, Reliable Air-Cooled Performance
  • Exclusive 100% Corrosion-Proof Enclosure
  • Polymer base eliminates the need for a concrete mounting pad.
  • Meets emission regulations for U.S. Environmental Protection Agency, CARB and EPA Certified Fuel System
  • The Kohler 20 kW generator can easily start and run a 5 ton air conditioner without dropping power to other appliances.*

* Check the appliance manufacturer’s specifications for actual power requirements. Consult a Kohler Power Systems professional to calculate your exact residential power system requirements.

IMPORTANT:  Warranty Coverage - Stationary standby applications used as a backup to a commercial utility source: Five (5) years from the registered startup date (or, if there is not a registered startup date, the date of purchase by the original end user) or 2000 hours (whichever occurs first).  Startup service is not included, your local Kohler Dealer can quote the price for start up.

Product Specifications

Model Number 20RESA
Manufacturer Kohler Power Systems
Made In USA Yes
Rated Watts 20kW
Rated Amps 83 LP/75 NG
Voltage 120/240V Single Phase
A/C Ton Rating 5 Ton
Enclosure Corrosion Proof Polymer
UL Listed Yes
Decibel Rating 69 dBA
Starting System Automatic
Low Oil Alert Low Oil Pressure Shutdown
Hour Meter Yes
Battery Requirement Requires 12V Group 51 500 CCA
Mounting Pad Included
Shipping Weight 535 lbs
Dimensions (Inches) 48L x 26.2W x 29H
Engine Brand Kohler CH1000
Engine Size 999 cc
Engine RPM 3600
Cooling System Air Cooled
Frequency 60 Hz
Auto Voltage Regulation Yes
Fuel Type Natural Gas/LP (Propane)
NG Power Capacity 18kW
LP Power Capacity 20kW
NG Consumption @ Full Load 281 cu.ft/hr
NG Consumption @ 1/2 Load 161 cu.ft/hr
LP Consumption @ Full Load 3.7 gal/hr
LP Consumption @ 1/2 Load 2.2 gal/hr
Transfer Switch
Transfer Switch Model Sold Separately
Warranty Information
Consumer Warranty 5 Year/2000 Hr Limited
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Product Reviews

  1. Cost Effective Peace of Mind

    Posted by Peter P. on 24th May 2014

    Installed the 20RESA 8/13. Had a very cold and snowy winter in this area of NJ. The unit responded perfectly on each outage - at least 4 that I'm aware of. Noise level was present but acceptable.

  2. Great design

    Posted by Unknown on 29th Apr 2013

    I attended a Kohler install seminar and these are really built well. Better than the mainstream units. Pay a little more and you get a great product.

  3. A life saver

    Posted by Joanne on 1st Nov 2012

    I've been on this generator for several days now thanks to power loss from Sandy. It has been a blessing to have light and heat in these terrible events on the Jersey shore. I had a few questions and the tech support at Kohler has been terrific. Maintainence is minimal - just check the oil every day and add as needed. One of the best decisions I ever made when I bought this

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.