New & used Commercial Kohler Generators for saleIndustrial-Rated Kohler Generators

Kohler Standby Generators From 125 kW to 2 MW

Kohler generators come through our yard more often than almost any other brand, and the range runs from small commercial standby units through multi-megawatt installations. Recent Kohler inventory has included units from 125 kW up to 2000 kW, in both diesel and natural gas, with most configured for permanent standby duty. That breadth makes Kohler a common choice for hospitals, data centers, schools and campuses, water districts, and commercial buildings of nearly every size. Browse our standby generators and used industrial generators for current options.

Kohler Is Now Rehlko

Buyers researching Kohler generators will increasingly see a second name. Kohler Co. separated its energy business in 2024, when Platinum Equity acquired it as an independent company, and the business was renamed Rehlko later that year. Kohler Co. remains an investment partner. Rehlko continues to build power generation equipment, and the Kohler name on existing units is not going anywhere. Newer equipment may carry Rehlko branding, and some of our listings already show both names. For a used buyer, the practical impact is minimal: the engineering, controllers, and product families are the same, and parts support for most units runs through the engine manufacturer as much as through Kohler itself. Kohler also builds engines used in other brands’ equipment. A Wacker Neuson generator we recently sold, for example, ran a Kohler KDI diesel engine.

How to Read a Kohler Model Number

Kohler model numbers look cryptic but follow a consistent pattern across the units we stock. The leading number tracks the standby kW rating, and the letters that follow indicate fuel type and engine family.

Example Model	What It Tells You
150REOZJF	150 kW standby, diesel, John Deere engine
600REOZVB	600 kW standby, diesel, Volvo Penta engine
800REOZMB	800 kW standby, diesel, Mitsubishi engine
1000REOZDC	1000 kW standby, diesel, MTU engine
300REZXB	300 kW standby, natural gas, PSI/Doosan engine
750REZK	750 kW standby, natural gas, Siemens engine

In our inventory, “REOZ” models are diesel and “REZ” models run on natural gas. Treat this as a quick reading guide rather than an official decoder, and confirm the engine and rating on each listing’s spec sheet. The engine make matters more than most buyers expect, since it determines where you source filters, injectors, and major components for the life of the unit.

Kohler Fuel Options

Kohler diesel generators dominate the larger sizes. Units at 400 kW and above typically carry Volvo Penta, Mitsubishi, MTU, or Detroit Diesel engines, often with UL-listed sub-base fuel tanks and weather or sound-attenuated enclosures. Natural gas Kohler units are common from the low hundreds of kilowatts up through 750 kW in our inventory, and they suit facilities that already have gas service and would rather avoid on-site fuel storage. Browse our natural gas generators and diesel generators to compare. Most Kohler units we carry are UL 2200 listed and use Kohler’s Decision-Maker control panels. Higher-end controllers in the lineup support paralleling, which matters if you plan to run multiple generators together.

Matching a Kohler Unit to Your Facility

Start with every load that runs at the same time, separate resistive from inductive, and account for the surge large motors draw at startup. Our power calculators will get you a working estimate. Small commercial buyers often start with units like 50 kW diesel generators or the 100kW – 249kW range. Mid-size facilities typically land in 250kW – 374kW or 500kW – 999kW, and large campuses and data centers move into 1000kW – 1499kW and 1500kW – 1999kW equipment. The shop by kW page lists every range.

Owning Kohler Backup Power Instead of Renting

For facility standby, buying is the clear answer. A backup generator earns its value by being on your site when the utility drops, and rental fleets are committed elsewhere during the regional outages you are protecting against. Used Kohler units keep the upfront cost manageable, and our generator financing options spread it further. Renting fits a temporary gap, such as covering a facility while a failed unit is replaced. Our rental division, Stag Power Rentals, handles those situations.

Kohler Generators With IronClad Coverage

Every Kohler generator we sell passes a 22-point inspection and load bank testing before shipment, so it arrives verified under load rather than on paper. We have been buying and selling industrial generators for more than a decade. Every purchase is backed by our 30-day IronClad warranty. After installation, our service team handles fuel system repair, emergency service, and scheduled maintenance. Comparing brands? Cummins generators and Generac generators compete across similar sizes, and our shop by brand page covers every manufacturer we carry.

Ready to Buy a Kohler Generator?

Tell us your load, your fuel preference, and whether you need paralleling capability, and we will match you to the right Kohler unit. Browse our full inventory of industrial generators or contact us to talk it through.