Kohler · REOZ Series (Diesel Commercial Standby)

Kohler 30REOZK

30 kW standby / 28 kW prime · Diesel · Liquid-cooled

30 kW diesel commercial standby generator. Kohler-powered diesel for commercial, healthcare, education, and government standby applications.

Kohler Kohler 30REOZK generator — specifications and details
Standby power
30 kW / 28 kW prime
Voltage options
120/208V, 277/480V, 120/240V
Frequency / Phase
60 Hz · 1/3-phase
Engine
Kohler KDI2504TM/G18 · 2.5L
CommercialHealthcareGovernment
Configure & QuoteDownload spec sheet

Overview#

The Kohler 30REOZK is a 30-kilowatt diesel commercial standby generator powered by a Kohler diesel engine at 1800 RPM. It is designed for commercial facilities, healthcare, education, and government applications where diesel fuel independence is required. The unit features a 4-pole rotating-field alternator with PowerBoost excitation and is available with durable enclosures rated for 186 mph wind loads.

Our service experience#

OnPoint services Kohler REOZK diesel generators throughout Northern California. The 30REOZK sits in a popular size band for small commercial buildings and branch offices, and we typically structure these accounts around an annual PM plus semi-annual fuel and filter inspection.

Engineering specifications

Physical

Length
56.6 in
Width
31.9 in
Height
40.3 in
Wet weight
1,130 lb

Fuel system & runtime

Fuel use @ full load
2.6 GPH
Fuel use @ 75% load
2.1 GPH
Fuel use @ 50% load
1.5 GPH

Photos

Kohler 30REOZK — product photo

Documents & downloads

Spec sheets & manuals

Ready to order this model?

Configure your Kohler 30REOZK

Lock the enclosure, fuel system, transfer switch, and add-ons — we'll confirm pricing, availability, and lead time within one business day. Prefer a free-form quote? That option is still here.

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Estimate runtime for the Kohler 30REOZK

Adjust load percent and tank size to estimate runtime. Pre-filled with this model's spec where available.

Estimate runtime on this tank

Estimated runtime

99.7 hours(4.2 days)

Fuel consumption ≈ 2.01 GPH at 75% load. Estimate based on industry-typical 1800 RPM standby curves (≈0.07 GPH/kW at full load). Actual consumption varies by engine, ambient temperature, fuel quality, and tuning.

Service intervals

Manufacturer-recommended intervals for the Kohler 30REOZK under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.

Oil & filter
Every 250 hours or 12 months
Coolant change
Every 2000 hours
Air filter
Every 500 hours
Fuel filter
Every 250 hours
Major overhaul
≈ 8,000 hours
Load bank test
Every 12 months

Common failure modes

What we've seen fail on this platform. Use as a service-planning reference, not a diagnostic — actual failure modes depend heavily on duty cycle and maintenance history.

ComponentSymptomTypical hoursSeverity
Fuel quality / degradationInjector fouling, hard starting, reduced power output4,380+moderate
Coolant thermostatOvercooling at light load, extended warmup time8,000+minor
Battery (starting)Slow crank, failed exercise, low voltage alarm8,760+minor

Frequently Asked Questions

What engine is in the Kohler 30REOZK?
The 30REOZK uses a Kohler diesel engine rated at 1800 RPM, EPA certified for stationary emergency standby use.
Is there a Tier 4 Final version of the 30REOZK?
Yes. The 30REOZK4 is the EPA Tier 4 Final variant of this model, certified for both stationary emergency and non-emergency applications.

Compatible equipment

Transfer switches

More in the REOZ Series (Diesel Commercial Standby)

Kohler's diesel commercial standby series — 10 to 510 kW, John Deere and Kohler engines, built for life-safety loads.

View all 33 models in this series →

Why we recommend Kohler

Kohler is our primary recommendation for commercial standby power. We sell and service the full Kohler line — RCA residential, RCL light commercial, KG industrial diesel, and REOZ large-frame — and our technicians are factory-trained on every product family.

We are an authorized Kohler dealer with factory-trained technicians. Kohler is the majority of our new generator sales today, spanning residential through large industrial. Our parts inventory is stocked for same-day Kohler service.

See all Kohler generators →

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Services for the Kohler 30REOZK

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