The Kohler 250REZXB is a 260-kilowatt LPG industrial standby generator in an enclosed configuration. Rated at 170-260 kW standby depending on voltage, it uses a Doosan engine paired with a brushless permanent-magnet alternator at 1800 RPM. This unit is EPA certified for both stationary emergency and non-emergency applications, with hurricane-rated enclosure options available featuring 186 mph wind load rating.
At 260 kW, 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. At this power level, propane consumption is significant, so tank sizing and delivery contracts become important planning considerations for extended outage scenarios.
OnPoint Generators provides installation, maintenance, and emergency service for Kohler gaseous generators throughout Northern California. The Doosan engine platform in the REZX series handles the 200+ kW class reliably, and we structure PM programs around annual ignition, fuel system, and coolant inspections with attention to the higher-capacity fuel delivery components.
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.
Manufacturer-recommended intervals for the Kohler 250REZXB 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.
Component
Symptom
Typical hours
Severity
Spark plugs / ignition
Misfire under load, cylinder dropout codes, rough idle
500+
minor
Turbocharger seals
Oil in intake, blue smoke, boost pressure loss
10,000+
moderate
Fuel pressure regulator / vaporizer
Hard starting, gas pressure fault, erratic idle
8,000+
moderate
Battery (starting)
Slow crank, failed exercise
8,760+
minor
Frequently Asked Questions
What is the standby rating of the Kohler 250REZXB?
The 250REZXB is rated 170-260 kW standby (213-325 kVA) depending on voltage configuration, with prime ratings of 225-235 kW, operating on LPG at 60 Hz.
What fuel does the Kohler 250REZXB use?
The 250REZXB operates on LPG (propane). Natural gas and dual-fuel variants are also available in the REZX 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.
