Kohler 8.5RES

8.5 kW, Single Phase, Natural Gas|LP

Affordable, commercial-grade power for basic power needs. When a bad storm or utility failure knocks out your power, the 8.5RES KOHLER® generator keeps your lights on, fridge cold and sump pump working. This generator will power most appliances in smaller homes, or a few critical items in larger homes.*


  • Reliable.

    Inside this generator is a commercial-grade engine built to withstand extreme workloads year after year.

  • Powerful.

    In just 10 seconds, your KOHLER generator automatically restores power to your heat or AC as well as appliances and electronics.*

  • Premium warranty.

    We’ve got you covered with 5-year, 2,000-hour protection and a steel enclosure that’s built to last.

  • Smart.

    You get steady, high-quality power that protects your electronics from damage related to low-quality power sources.

  • Money saver.

    No pricey concrete pad needed. Your contractor – and your wallet – will appreciate the built-in mounting pad and easy-to-connect terminal block.


  • PowerBoost™ technology provides the power to start large loads without dropping power to other appliances

  • Extraordinary peak motor-starting capacity: 23kVA at 240V

  • Premium power quality delivers exceptional digital voltage and frequency regulation along with low levels of harmonic distortion to protect sophisticated electronics

  • Powered by reliable KOHLER Command PRO® engine, designed and tested for tough commercial applications; with hydraulic valve lifters to eliminate need for lengthy break-in periods and expensive valve adjustments; operation speed is 3600 rpm (the standard for air-cooled generators)


  • ADC-RES Advanced Digital Control designed for today’s sophisticated electronics

  • Quiet, neighborhood-friendly operation with sound levels similar to a typical central air conditioner

  • Steel enclosure with automotive-grade paint for advanced corrosion protection

  • Runs on either natural gas or liquid propane (LPG) with simple switching between natural gas and LPG in the field

  • Streamlined installation, including built-in base that eliminates need for concrete mounting pad and simple terminal block for easy field connections

  • Compatible with optional OnCue® Generator Management System

*Based on generator and load size.


Rated kW LP 8.5 kW
Rated kW NG 7.0 kW
Amps LP 35 amps
Amps NG 29 amps
Peak Motor Starting kVA @240 V 23 kVa
Alternator Note All information shown is for 1 Phase 60 Hz generator with the largest alternator option available.
Displacement 0.624 L (38 cu. in.)
Horsepower NG 13.4 HP, LP 15.4 HP
Enclosure Material Steel
Sound Output During Full-speed Operation 65 dB(A)
Response Time 10 seconds
Warranty Premium five-year limited warranty
Country of Origin US
Certifications/Listings EPA|CSA|CARB
Automatic Transfer Switch Included No
Remote Monitoring Available Yes
Off Grid Warranty 18-month/1000-hour for off-grid applications
Off Grid / Utility Backup Utility Backup|Off Grid
Weight 430 lbs.
Alternator Type 2-Pole, Rotating Field
Fuel Consumption on NG at 50% load? 31 cfh
Fuel Consumption on LP at 50% load? 31 cfh
Controller Advanced Digital Control
Cylinder Arrangement V-2
Dimensions 1123mm x 726mm x 804mm (44.2 in. x 28.6 in. x 31.6 in.)
Engine Manufacturer/Description KOHLER
Engine Model CH20
Engine/Alternator RPM 3600
Fuel Type Natural Gas|LP
Frequency 60 Hz|50 Hz
Phase Single Phase
Voltage @ 60 Hz 120/240
Digital Voltage Regulation ±1.5%


Dixon ZTR
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