Kohler · RZX Series (Industrial Gaseous)

Kohler 250RZXB

260 kW standby / 235 kW prime · LPG · Liquid-cooled

224 kW LPG industrial standby generator. Open-frame gaseous standby with Doosan engine for commercial and industrial facilities.

Kohler Kohler 250RZXB generator — specifications and details
Standby power
260 kW / 235 kW prime
Voltage options
120/208V, 277/480V
Frequency / Phase
60 Hz · 3-phase
Engine
Doosan D146L · 14.6L
Alternator
Kohler Brushless, Permanent-Magnet
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Overview#

The Kohler 250RZXB is a 224-kilowatt LPG industrial standby generator in an open-frame (skid-mounted) configuration. Rated at 148-224 kW standby depending on voltage, it uses a Doosan engine paired with a brushless permanent-magnet alternator at 1800 RPM. The open-frame design is intended for indoor mechanical rooms or buildings with dedicated generator enclosures.

Gaseous vs diesel at 224 kW#

At this capacity, gaseous generators eliminate on-site fuel storage requirements and SPCC compliance. LPG provides clean combustion with lower emissions than diesel and avoids fuel degradation issues common with low-runtime standby diesel units. At this power level, propane consumption is significant, so tank sizing and delivery contracts become important planning considerations.

Our service experience#

PowerGen provides installation, maintenance, and emergency service for Kohler gaseous generators throughout Northern California. The Doosan engine platform in the RZX series handles the 200+ kW class reliably, and we structure PM programs around annual ignition, fuel system, and coolant inspections.

Engineering specifications

Physical

Length
137.8 in
Width
68.9 in
Height
84.6 in
Wet weight
7,055 lb

Fuel system & runtime

NG required pressure
7 in WC

Photos

Kohler 250RZXB — product photo

Documents & downloads

Spec sheets & manuals

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Service intervals

Manufacturer-recommended intervals for the Kohler 250RZXB 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 3000 hours
Air filter
Every 500 hours
Spark plugs
Every 500 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
Spark plugs / ignitionMisfire under load, cylinder dropout codes, rough idle500+minor
Turbocharger sealsOil in intake, blue smoke, boost pressure loss10,000+moderate
Fuel pressure regulator / vaporizerHard starting, gas pressure fault, erratic idle8,000+moderate
Battery (starting)Slow crank, failed exercise8,760+minor

Frequently Asked Questions

What is the standby rating of the Kohler 250RZXB?
The 250RZXB is rated 148-224 kW standby (185-280 kVA) depending on voltage configuration, with a prime rating of 200 kW (250 kVA), operating on LPG at 60 Hz.
What fuel does the Kohler 250RZXB use?
The 250RZXB operates on LPG (propane). Natural gas and dual-fuel variants are also available in the RZX line.
What is the difference between RZX and REZX models?
RZX designates the open-frame (skid-mounted) configuration, while REZX is the enclosed (sound-attenuated or weather-protective) version. Both use the same engine-alternator package; the difference is the enclosure.

Compatible equipment

Engine

Transfer switches

More in the RZX Series (Industrial Gaseous)

Kohler RZX open-frame LPG gensets from 190 to 400 kW — skid-mounted for indoor mechanical room installation.

View all 6models in this series →

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