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Kohler 20RESA 20kW, 120/240V UL Generator

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  • Industry-renowned for high-quality and reliable generators
  • Made in USA

Product Information

Model Part No. Watts (LPG/Natural Gas) Amps Volts AC Size & Weight Price
Kohler 20RESA 20kW, 120/240V UL Generator187012020,000 / 18,000W83A120 / 240VAC48 × 26.2 × 29 in
535 lbs


Kohler’s 20RESA generator is ideal for whole-home backup of most medium homes. Installed outside on a concrete or gravel pad and enclosed in a polymer shell, the 20RESA uses Kohler’s CH1000 engine to produce 20kW of clean power (18kW using natural gas). Additional surge capacity of 40.5kVA is available as needed, and two 20RESA units can be put in parallel using Kohler’s PowerSync® Automatic Parallel Module (sold separately) to produce up to 40kW of backup power for larger homes.

The 20RESA operates at a neighborhood-friendly sound level not exceeding 69 dB(A) and meets EPA emission regulation standards for both propane and natural gas applications. It’s polymer shell is corrosion-proof and has been tested to withstand even the harshest environments. For more sophisticated installations, homeowners can pair the 20RESA with Kohler’s Load Shed Kit (sold separately), which automatically disconnects non-critical loads as needed based on pre-programmed priorities. The Load Shed Kit makes the 20RESA feasible as whole home backup for even larger homes.

Kohler’s sophisticated and user-friend RDC2 Controller is included with all 20RESA units, allowing users to easily program and control their generator. The RDC2 Controller also includes the option to pre-program repeating maintenance exercises on a weekly or bi-weekly schedule, which supports longer equipment lifespan. Kohler’s sophisticated OnCue Plus Generator Management System, which allows homeowners to remotely monitor and control their 20RESA generator via web browser and/or smartphone app, is sold separately, as is the recommended CH740 Maintenance Kit.


Manufacturer’s warranty for 5 years or 2,000 hours for standby applications. Warranty is not applicable for off-grid installations.

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Features & Attributes

  • Dimensions (LxWxH): 48 × 26.2 × 29 inches
  • Weight: 535 lbs
  • OnCue Plus Generator Management System compatible
  • Remote two-wire stop/start capability
  • Corrosion-proof polymer enclosure
  • Requires one 12VDC Group 51 battery, sold separately
  • UL 2200 Listed
  • Shipping Weight: 535 lbs
  • MPN: 20RESA-QS13
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Kohler 20RESA 20kW, 120/240V UL Generator

Product Manual
Spec. Sheet
Installation Manual
Dimensional Drawing
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About Kohler

KOHLER Power Systems is a division of Kohler Co., and provides complete power systems, including generators (home, industrial, mobile and marine), automatic transfer switches, switchgear, monitoring controls, and accessories for emergency, prime power and energy-management applications. KOHLER Power Systems has delivered energy solutions for markets worldwide since 1920.

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