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Tri-Fuel Inverter Generators

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Tri-fuel inverter generators run on natural gas, propane, and gasoline. They provide pure sine wave electricity (<3% THD) and connect directly to home gas meters for continuous emergency backup.

1 Continuous natural gas supply eliminates gas station lines during storms

2 Cleaner combustion reduces spark plug fouling and carburetor maintenance

3 Natural gas produces approximately 15% to 20% lower peak wattage than gasoline

Tested Models in this Class (18)

Sorted by continuous running power

Tri-Fuel Score 8.4/10

Open-Frame Inverter 2.4% THD

GENMAX : 458cc 4-Stroke OHV Air-Cooled Cast-Iron Sleeve : Floating Neutral

GENMAX GM10500XiT 10,500W Peak / 8,000W Running Open-Frame Tri-Fuel Inverter

Best For: Value-focused whole-home 50-amp interlock backup with factory Floating Neutral and <3% pure sine wave.

Running / Surge 8,000W / 10,500W

Noise @ 23ft 68 dBA (Open-Frame)

Fuel & Runtime Gas/LPG/NG (13.5h)

Backup Outlet NEMA 14-50R

Power Purity <2.4% THD (Floating)

Weight & Mobility 156.5 lbs (Wheel Kit)

Lowest Verified Price

$1,549.00

$0.19 / Running Watt

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Tri-Fuel Score 8.8/10

Enclosed Inverter 2.1% THD

Westinghouse : 457cc 4-Stroke OHV Copper-Wound Alternator : Bonded Neutral

Westinghouse iGen12000TFc 12,000W Peak / 9,000W Running Enclosed Tri-Fuel Inverter

Best For: Large 4-ton to 5-ton central A/C homes needing maximum 9,500W+ enclosed tri-fuel inverter power.

Running / Surge 9,000W / 12,000W

Noise @ 23ft 64 dBA (Quiet)

Fuel & Runtime Gas/LPG/NG (16h)

Backup Outlet NEMA 14-50R

Power Purity <2.1% THD (Bonded)

Weight & Mobility 191 lbs (Wheel Kit)

Lowest Verified Price

$1,849.00

$0.21 / Running Watt

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Tri-Fuel Score 8.5/10

Enclosed Inverter 1.9% THD

DuroMax : 459cc 4-Stroke OHV 100% Copper Winding : Bonded Neutral

DuroMax XP11000iHT 11,000W Peak / 9,000W Running Enclosed Tri-Fuel Inverter

Best For: Quiet 61 dBA enclosed tri-fuel home backup with 100% copper windings and remote start.

Running / Surge 9,000W / 11,000W

Noise @ 23ft 61 dBA (Quiet)

Fuel & Runtime Gas/LPG/NG (17h)

Backup Outlet NEMA 14-50R

Power Purity <1.9% THD (Bonded)

Weight & Mobility 239 lbs (Wheel Kit)

Lowest Verified Price

$2,499.00

$0.28 / Running Watt

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Tri-Fuel Score 8.1/10

Open-Frame Inverter 2.6% THD

Champion : 420cc 4-Stroke OHV Champion Tri-Fuel : Bonded Neutral

Champion 201176 9,000W Peak / 7,250W Running Open-Frame Tri-Fuel Inverter

Best For: Budget-conscious whole-home tri-fuel backup with a 3-year residential warranty and open-frame serviceability.

Running / Surge 7,250W / 9,000W

Noise @ 23ft 64 dBA (Quiet)

Fuel & Runtime Gas/LPG/NG (14h)

Backup Outlet NEMA 14-50R

Power Purity <2.6% THD (Bonded)

Weight & Mobility 165 lbs (Wheel Kit)

Lowest Verified Price

$1,349.00

$0.19 / Running Watt

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Tri-Fuel Score 8.7/10

Enclosed Inverter 2.2% THD

A-iPower : 500cc 4-Stroke OHV Copper-Wound Alternator : Floating Neutral

A-iPower GXS12000iRD 12,000W Peak / 9,500W Running Enclosed Tri-Fuel Inverter

Best For: 50-amp whole-home tri-fuel backup with Factory Floating Neutral and 500cc displacement.

Running / Surge 9,500W / 12,000W

Noise @ 23ft 63 dBA (Quiet)

Fuel & Runtime Gas/LPG/NG (15.5h)

Backup Outlet NEMA 14-50R

Power Purity <2.2% THD (Floating)

Weight & Mobility 218 lbs (Wheel Kit)

Lowest Verified Price

$1,999.00

$0.21 / Running Watt

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Tri-Fuel Score 8.7/10

Open-Frame Inverter 4.8% THD

Champion : 439cc Champion 4-Stroke OHV Engine : Bonded Neutral

Champion 100813 9,375W Peak / 7,500W Running Tri-Fuel Generator with CO Shield

Best For: Whole-home backup resilience and jobsite power requiring dependable Bonded Neutral operation and clean electrical sine waves.

Running / Surge 7,500W / 9,375W

Noise @ 23ft 72 dBA (Open-Frame)

Fuel & Runtime Gas/LPG/NG (16.5h)

Backup Outlet NEMA 14-50R

Power Purity <4.8% THD (Bonded)

Weight & Mobility 207 lbs (Wheel Kit)

Lowest Verified Price

$1,299.00

$0.17 / Running Watt

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Tri-Fuel Score 8.5/10

Enclosed Inverter 2.1% THD

Champion : 292cc 4-Stroke OHV Copper-Wound Alternator : Floating Neutral

Champion 201183 5,500W Peak / 4,250W Running Enclosed Tri-Fuel RV & Home Inverter

Best For: Quiet 59 dBA essential-circuit natural gas backup and 30-amp RV camping.

Running / Surge 4,250W / 5,500W

Noise @ 23ft 59 dBA (Quiet)

Fuel & Runtime Gas/LPG/NG (14.5h)

Backup Outlet NEMA L14-30R

Power Purity <2.1% THD (Floating)

Weight & Mobility 121 lbs (Wheel Kit)

Lowest Verified Price

$1,099.00

$0.26 / Running Watt

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Tri-Fuel Score 8.8/10

Enclosed Inverter 2% THD

Champion : 459cc 4-Stroke OHV Copper-Wound Alternator : Bonded Neutral

Champion 201423 11,000W Peak / 9,000W Running Enclosed Tri-Fuel Inverter

Best For: Turnkey enclosed tri-fuel home backup with 25-foot NG hose included and 3-year warranty.

Running / Surge 9,000W / 11,000W

Noise @ 23ft 62 dBA (Quiet)

Fuel & Runtime Gas/LPG/NG (15h)

Backup Outlet NEMA 14-50R

Power Purity <2% THD (Bonded)

Weight & Mobility 218 lbs (Wheel Kit)

Lowest Verified Price

$2,099.00

$0.23 / Running Watt

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Tri-Fuel Score 8.6/10

Open-Frame Inverter 2.9% THD

DuroMax : 500cc 4-Stroke OHV Copper-Wound Alternator : Bonded Neutral

DuroMax XP13000HXT 13,000W Peak / 10,500W Running 500cc Tri-Fuel Home Backup Generator

Best For: High-surge 50-amp whole-house backup where raw 500cc natural gas torque matters most.

Running / Surge 10,500W / 13,000W

Noise @ 23ft 72 dBA (Open-Frame)

Fuel & Runtime Gas/LPG/NG (17h)

Backup Outlet NEMA 14-50R

Power Purity <2.9% THD (Bonded)

Weight & Mobility 240 lbs (Wheel Kit)

Lowest Verified Price

$1,599.00

$0.15 / Running Watt

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Tri-Fuel Score 8.9/10

Enclosed Inverter 1.8% THD

DuroMax : 760cc 4-Stroke OHV Copper-Wound Alternator : Bonded Neutral

DuroMax XP16000iHT 16,000W Peak / 13,000W Running V-Twin Enclosed Tri-Fuel Inverter

Best For: Large luxury homes needing full 50-amp (10,800W+) natural gas inverter capacity.

Running / Surge 13,000W / 16,000W

Noise @ 23ft 64 dBA (Quiet)

Fuel & Runtime Gas/LPG/NG (16.5h)

Backup Outlet NEMA 14-50R

Power Purity <1.8% THD (Bonded)

Weight & Mobility 365 lbs (Wheel Kit)

Lowest Verified Price

$4,499.00

$0.35 / Running Watt

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Tri-Fuel Score 8.3/10

Open-Frame Inverter 2.9% THD

Firman : 439cc 4-Stroke OHV Copper-Wound Alternator : Bonded Neutral

Firman T08073 10,000W Peak / 8,000W Running Tri-Fuel Home Backup Generator

Best For: Sub-$1,000 tri-fuel home backup when paired with a Micro-Air EasyStart soft-starter.

Running / Surge 8,000W / 10,000W

Noise @ 23ft 71 dBA (Open-Frame)

Fuel & Runtime Gas/LPG/NG (14h)

Backup Outlet NEMA 14-50R

Power Purity <2.9% THD (Bonded)

Weight & Mobility 213 lbs (Wheel Kit)

Lowest Verified Price

$999.00

$0.12 / Running Watt

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Tri-Fuel Score 8.6/10

Enclosed Inverter 1.9% THD

Firman : 338cc 4-Stroke OHV Copper-Wound Alternator : Floating Neutral

Firman WT05571 6,850W Peak / 5,500W Running Whisper Series Enclosed Tri-Fuel Inverter

Best For: Quiet 58 dBA 30-amp home transfer switches running on natural gas or propane.

Running / Surge 5,500W / 6,850W

Noise @ 23ft 58 dBA (Quiet)

Fuel & Runtime Gas/LPG/NG (13h)

Backup Outlet NEMA L14-30R

Power Purity <1.9% THD (Floating)

Weight & Mobility 146 lbs (Wheel Kit)

Lowest Verified Price

$1,399.00

$0.25 / Running Watt

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Tri-Fuel Score 8.7/10

Enclosed Inverter 2.1% THD

GENMAX : 458cc 4-Stroke OHV Copper-Wound Alternator : Floating Neutral

GENMAX GM10500iETC 10,500W Peak / 8,500W Running Enclosed Tri-Fuel Inverter

Best For: Suburban homeowners wanting a quiet 62 dBA enclosed tri-fuel inverter with Factory Floating Neutral.

Running / Surge 8,500W / 10,500W

Noise @ 23ft 62 dBA (Quiet)

Fuel & Runtime Gas/LPG/NG (14h)

Backup Outlet NEMA 14-50R

Power Purity <2.1% THD (Floating)

Weight & Mobility 216 lbs (Wheel Kit)

Lowest Verified Price

$2,199.00

$0.26 / Running Watt

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Tri-Fuel Score 8.9/10

Enclosed Inverter 2.3% THD

Genmax : 458cc 4-Stroke OHV Commercial Engine : Floating Neutral

Genmax GM12000iET 12,000W Peak / 9,000W Running Tri-Fuel Inverter Generator

Best For: Whole-home backup resilience and jobsite power requiring dependable Floating Neutral operation and clean electrical sine waves.

Running / Surge 9,000W / 12,000W

Noise @ 23ft 66 dBA (Open-Frame)

Fuel & Runtime Gas/LPG/NG (12h)

Backup Outlet NEMA 14-50R

Power Purity <2.3% THD (Floating)

Weight & Mobility 195 lbs (Wheel Kit)

Lowest Verified Price

$1,899.00

$0.21 / Running Watt

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Tri-Fuel Score 8.3/10

Open-Frame Inverter 2.9% THD

Predator : 500cc 4-Stroke OHV Copper-Wound Alternator : Bonded Neutral

Predator 13000 13,000W Peak / 10,000W Running Heavy-Duty Tri-Fuel Home Backup Generator

Best For: Budget 50-amp whole-home tri-fuel backup with local Harbor Freight parts availability.

Running / Surge 10,000W / 13,000W

Noise @ 23ft 73 dBA (Open-Frame)

Fuel & Runtime Gas/LPG/NG (15h)

Backup Outlet NEMA 14-50R

Power Purity <2.9% THD (Bonded)

Weight & Mobility 238 lbs (Wheel Kit)

Lowest Verified Price

$1,299.00

$0.13 / Running Watt

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Tri-Fuel Score 8.5/10

Open-Frame Inverter 2.9% THD

WEN : 550cc 4-Stroke OHV Copper-Wound Alternator : Bonded Neutral

WEN TF1450X 14,500W Peak / 11,500W Running Heavy-Duty 550cc Tri-Fuel Generator

Best For: Maximum 50-amp whole-home natural gas wattage on a strict $1,300 hardware budget.

Running / Surge 11,500W / 14,500W

Noise @ 23ft 72.5 dBA (Open-Frame)

Fuel & Runtime Gas/LPG/NG (18.5h)

Backup Outlet NEMA 14-50R

Power Purity <2.9% THD (Bonded)

Weight & Mobility 232 lbs (Wheel Kit)

Lowest Verified Price

$1,299.00

$0.11 / Running Watt

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Tri-Fuel Score 8.4/10

Open-Frame Inverter 2.3% THD

Westinghouse : 420cc 4-Stroke OHV Copper-Wound Alternator : Bonded Neutral

Westinghouse iGen8200TFc 8,200W Peak / 6,600W Running Open-Frame Tri-Fuel Inverter

Best For: Mid-size 3-ton A/C homes needing a portable 144-lb tri-fuel inverter with 240V output.

Running / Surge 6,600W / 8,200W

Noise @ 23ft 65.5 dBA (Open-Frame)

Fuel & Runtime Gas/LPG/NG (14.5h)

Backup Outlet NEMA L14-30R

Power Purity <2.3% THD (Bonded)

Weight & Mobility 144 lbs (Wheel Kit)

Lowest Verified Price

$1,249.00

$0.19 / Running Watt

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Tri-Fuel Score 8.7/10

Open-Frame Inverter 2.9% THD

Westinghouse : 550cc 4-Stroke OHV Copper-Wound Alternator : Bonded Neutral

Westinghouse WGen11500TFc 14,500W Peak / 11,500W Running Heavy-Duty Tri-Fuel Generator

Best For: Whole-house 50-amp backup with 9,500W natural gas output at an unbeatable $1,499 price.

Running / Surge 11,500W / 14,500W

Noise @ 23ft 72 dBA (Open-Frame)

Fuel & Runtime Gas/LPG/NG (19h)

Backup Outlet NEMA 14-50R

Power Purity <2.9% THD (Bonded)

Weight & Mobility 236 lbs (Wheel Kit)

Lowest Verified Price

$1,499.00

$0.13 / Running Watt

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