FIRMAN 459cc Tri-Fuel Portable Generator – 11,600-Watt Class

Legendary FIRMAN Engineering. Reliable Power. Three Fuel Options.

The FIRMAN Tri-Fuel Portable Generator delivers dependable power for home backup, job sites, and emergency situations. Powered by a robust 459cc engine, it operates on gasoline, LPG (propane), or natural gas, offering flexibility when choosing an available fuel source.

With electric and recoil starting, a durable cast-iron cylinder sleeve, low-oil shutoff, and CO Sensor Alert technology, this generator combines practical operation with essential safety features. Its 120/240V output, multiple covered outlets, and 9-gallon fuel tank make it a versatile solution for demanding power needs.

Key Features

Powerful 459cc Tri-Fuel Engine

The FIRMAN 459cc engine supports three fuel options, allowing you to select gasoline, propane, or natural gas according to availability and application.

Multiple Starting Options

Choose between electric start for convenient operation and recoil start as a backup.

Strong Output Across Three Fuel Types

The generator provides different starting and running power levels depending on the fuel used.

Fuel Type	Starting Watts	Running Watts
Gasoline	11,400 W or 11,600 W*	9,300 W
LPG (Propane)	10,400 W	8,300 W
Natural Gas	8,650 W	6,900 W

The supplied information lists two gasoline starting-wattage figures: 11,400W and 11,600W. Verify the correct rating before publishing.

Extended Runtime

The 9-gallon fuel tank provides up to 11 hours of runtime at 50% load, according to the supplied specifications. Actual runtime depends on load, fuel type, and operating conditions.

Essential Engine Protection

The generator includes an automatic low-oil shutoff feature to help protect the engine from damage caused by insufficient oil.

CO Sensor Alert

Built-in carbon monoxide detection helps protect users by alerting to dangerous CO conditions and initiating the specified safety response. Always operate the generator outdoors, far from doors, windows, vents, and occupied spaces.

Multi-Feature Control Panel

The control panel features covered outlets and several connection options for compatible equipment, including a 120/240V, 50A outlet.

Durable, Portable Construction

Weighing 217.5 lbs, the generator is built for demanding applications where substantial portable power is required.

Technical Specifications

Specification	Details
Brand	FIRMAN
Generator Type	Portable tri-fuel generator
Engine Displacement	459cc
Fuel Types	Gasoline, LPG/propane, natural gas
Starting System	Electric start and recoil start
Gasoline Starting Watts	11,400W or 11,600W — verify
Gasoline Running Watts	9,300W
LPG Starting Watts	10,400W
LPG Running Watts	8,300W
Natural Gas Starting Watts	8,650W
Natural Gas Running Watts	6,900W
AC Voltage	120/240V
Frequency	60Hz
Fuel Tank Capacity	9 gallons
Maximum Listed Runtime	Up to 11 hours at 50% load
Noise Level	74 dB; load condition differs across source entries
Total Harmonic Distortion (THD)	11%–14% at full load
Weight	217.5 lbs
Engine Protection	Low-oil shutoff
Carbon Monoxide Protection	CO Sensor Alert
Warranty	4 years, as supplied

Outlet Configuration

Quantity	Outlet Type	Voltage	Amperage
1 duplex	5-20R GFCI	120V	20A
1	L5-30R twist-lock	120V	30A
1	L14-30R twist-lock	120/240V	30A
1	14-50R	120/240V	50A

The supplied specifications also list the 14-50R outlet as supporting 38.8A at 240V and 9,300W. Confirm the manufacturer's intended outlet and output ratings before connecting high-demand equipment.

Certifications and Compliance

Certification	Status
EPA Certified	Yes
CARB Certified	No
cETL Certified	Yes
NOM Certified	Yes
UL Certified	No
ANSI/PGMA G300-2018	Yes

Ideal Applications

• Home backup power


• Emergency power during outages


• Job-site equipment


• Backup power setups using a compatible transfer switch


• Applications where access to multiple fuel sources is beneficial

Safety and Operating Guidelines

• Operate the generator outdoors only. Never run it inside a home, garage, shed, or other enclosed or partially enclosed space.


• Keep the unit well away from doors, windows, vents, and occupied areas to reduce carbon monoxide exposure risk.


• Follow the manufacturer's instructions for fuel connections, maintenance, grounding, and safe operation.


• Use a properly rated transfer switch for home backup connections; never connect the generator directly to household wiring without an approved arrangement.


• Check the generator's output ratings and connected equipment requirements before use.

Warranty and Support

The supplied product information lists a 4-year warranty. Confirm the warranty terms, coverage, and eligibility with FIRMAN before purchase or publication.

Why Choose the FIRMAN Tri-Fuel Generator?

With its 459cc engine, three fuel options, electric and recoil starting, multiple outlet configurations, and essential engine and carbon monoxide safety features, this FIRMAN generator is designed to provide flexible power for home backup and demanding work environments.

Important specification note: Verify the gasoline starting-wattage rating (11,400W versus 11,600W), the stated noise level and measurement conditions, the 14-50R outlet's listed current/output figures, and the 4-year warranty terms before finalizing the product listing.

• We currently ship within the United States only.
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• Orders are processed within 1–2 business days.
• Estimated Total Delivery Time is 4–7 business days.
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• Items must be unused and in original condition.
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