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Kohler 20RES - 20kW Home Standby Generator (Composite Enclosure)

Kohler Electric Generators and Accessories
Model: 20RES
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  • Features
  • Specs
  • 2
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  • Articles
Run Watts
Rated Watts
120/240 Single-Phase

Product Video Disclaimer: "PED is not responsible for any variances from the product in this video and the item you purchase. Please review all product specs prior to purchase."

Kohler Command PRO® OHV Engine
Meets emission regulations for U.S. EPA & California
Powerful and reliable engine with hydraulic valve lifters

PowerBoost™ Technology
Greater motor-starting ability for large electrical loads

Cleaner Power for Sensitive Electronics
Protects sophisticated electronics with low distortion (THD)

Fast Response
Kohler™ generators restore power in as little as 10 seconds

Quiet Operation
Maintains neighborhood solitude - approx 73 dB(A) at 7 m (23 ft)

ADC-RES Advanced Digital Control
Digital voltage regulation & engine speed governing
LED display shows system status and setup information

Easy Installation
Polymer base eliminates the need for a concrete pad
Simple field conversion between natural gas and LP

Exclusive 100% Corrosion-Proof Composite Enclosure
Will not rust - even in harsh seaside environments

Transfer Switch Sold Separately
Engine Brand
30 HP
999 CC
Consumer Engine Warranty
5 Years
Commercial Engine Warranty
5 Years
Engine RPM
3600 RPM
Low Oil Alert/Shutdown
Product Specs
120/240 Single-Phase
60 Hertz
Rated Watts
20000 Watts
Fuel Type
LP/Natural Gas
NG Power Capacity
18000 Watts
LP Power Capacity
20000 Watts
NG Fuel Consumption @ 50% Load
161 (BTU: 161,000 BTU/HR) ft³/hr
LP Fuel Consumption @ 50% Load
2.3 (BTU: 208,725 BTU/HR) gallons/hr
Rated Amps
83 @ 240 Volts (Single Phase) Amps
Decibel Rating @ 7m
73 dbA
Transfer Switch
Automatic (Not Included)
Not Included (500 CCA)
A/C Ton Rating
Mounting Pad
Composite (Included)
Cooling System
Air Cooled
UL Listed
Grade Type
Made in USA
500 Pounds
Product Style
Standby Generator
Product Length
48 Inches
Product Width
26.2 Inches
Product Height
29 Inches
Consumer Warranty
5 Years
Commercial Warranty
5 Years
  2 Questions
Q: I've heard that a Kohler dealer must do the "startup" of the generator, otherwise the warranty is void. Dealers in this area seem to charge big $$ for this service. What's the deal?
by Woody Montreaux from Massachusetts on February 22, 2011

A: This is correct. A Kohler dealer must do the "start-up" to preserve the manufacturers warranty.
by Mike, Product Expert

Q: Hi
I am upgrading from a 6.3 KW Propane Kohler to this 20KW - I hope! My feed line is 7/8" OD and I figure about 1/2" ID, will that give me enough fuel supply to this unit?

by Dan Elmendorf from New York on January 19, 2011

A: Generator fuel pipe sizing is based on the wattage size of the unit along with the distance from the fuel source. Kohler does list the pipe sizes in the specification sheet for each model. We list the specification sheet within the specs tab to the left of the Q & A tab.

Spec Sheet
by Mike, Product Expert

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Shop for the Kohler 20RES - 20kW Home Standby Generator (Composite Enclosure) at Electric Generators Direct. Research Kohler standby generators air-cooled generator online. Find Kohler 20RES standby generators air-cooled generator & Kohler liquid propane vapor and natural gas operated generator system features and specifications.