Compare Generators Side-by-Side
Select up to 4 generators to compare specs, power output, noise levels, runtime and more. Your compare URL is shareable.
- Firman T04073
- AIVOLT VS8000411
Quick charts
Each chart uses its own Y-axis scale (so numbers are comparable within a chart).
Running watts
W
Starting watts
W
Noise
dB
Runtime @50%
h
Running watts by fuel
Shows how output changes across gasoline/propane/natural gas (when available).
| Specification | Firman T04073 | AIVOLT VS8000411 |
|---|---|---|
| General | ||
| Product type | Generator | Not available |
| Fuel | Tri-Fuel | Dual-Fuel |
| Inverter | No | Yes |
| Parallel capable | No | Yes |
| RV ready | No | Yes |
| Running watts | 4000 W | Winner: Winner: 6100 W |
| Starting watts | 5000 W | Winner: Winner: 8000 W |
| Noise (lower limit) | 67 dB | Winner: Winner: 62 dB |
| Weight | Winner: Winner: 123.4 lbs | 129 lbs |
| Run time @50% load | Winner: Winner: 12 h | Not available |
| Run time @25% load | 14 h | Not available |
| Fuel tank | 5 gal | Not available |
| Fuel gauge | Yes | No |
| Approx. dimensions (L × W × H) | 29.8 x 27.5 x 26.1 | 25.2"L x 19.7"W x 21.4"H |
| Electrical | ||
| Voltage (AC) | 120/240 | 120 Volts |
| Voltage (DC) | Not available | Not available |
| GFCI outlets | Yes | No |
| Covered outlets | Yes | No |
| Automatic Voltage Regulation | Yes | No |
| THD | 11%-14% % | 3 % |
| Engine | ||
| Engine | 223 cc OHV 4-stroke, cast iron sleeve | 322cc 4-stroke OHV engine |
| Alternator | Not available | Not available |
| Starting system | Recoil, Electric | Electric start |
| Warranty | ||
| Warranty | 3 years | Not available |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 4000 W | 6100 W |
| Starting watts | 5000 W | 8000 W |
| Running amps (120V) | Not available | Not available |
| Running amps (240V) | Not available | Not available |
| Peak amps (120V) | Not available | Not available |
| Peak amps (240V) | Not available | Not available |
| Run time @50% load | 14 h | Not available |
| Run time @25% load | Not available | Not available |
| Natural gas | Not available | Not available |
| Running watts | 3200 W | Not available |
| Starting watts | 4000 W | Not available |
| Running amps (120V) | Not available | Not available |
| Running amps (240V) | Not available | Not available |
| Peak amps (120V) | Not available | Not available |
| Peak amps (240V) | Not available | Not available |
| Run time @50% load | Not available | Not available |
| Run time @25% load | Not available | Not available |
| Propane | Not available | Not available |
| Running watts | 3600 W | Not available |
| Starting watts | 4500 W | Not available |
| Running amps (120V) | Not available | Not available |
| Running amps (240V) | Not available | Not available |
| Peak amps (120V) | Not available | Not available |
| Peak amps (240V) | Not available | Not available |
| Run time @50% load | 9 h | Not available |
| Run time @25% load | Not available | Not available |
| Other | ||
| Data center | Not available | Not available |
| Indicators | true | Not available |
| Compliance | CARB, EPA, ANSI/PGMA G300-2023 | EPA & CARB compliant |
| Security | Not available | Not available |
| Spark arrestor | Yes | No |
| Neutral | true | Not available |
| UPC | 840876140734 | Not available |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 4000 | 6100 |
| Running Watts (Propane) | 3600 | Not available |
| Running Watts (Natural Gas) | 3200 | Not available |
| Starting Watts (Gasoline) | 5000 | 8000 |
| Starting Watts (Propane) | 4500 | Not available |
| Starting Watts (Natural Gas) | 4000 | Not available |
| Runtime @ 50% Load (Gasoline) | 14 | Not available |
| Runtime @ 50% Load (Propane) | 9 | Not available |
| AC Outlet Types | 1x Duplex 120V 20A (5-20R) GFCI; 1x 120V 30A (L5-30R); 1x 120/240V 30A (L14-30R) | 4 outlets |
| Electrical & power | ||
| Frequency | 60 | 50 |
| Engine & construction | ||
| Engine Type | 223 cc OHV 4-stroke | Not available |
| Engine Displacement | 223 | 322 |
| Cylinder Sleeve | cast iron | Not available |
| Alternator Winding Material | Not available | 100% copper windings |
| Runtime & fuel system | ||
| Runtime @ 50% Load (Gasoline) | 14 | Not available |
| Runtime @ 50% Load (Propane) | 9 | Not available |
| Controls & display | ||
| Display Type | Not available | 5-in-1 LCD display center |
| Idle Control System | Not available | Eco-Mode |
| Safety & compliance | ||
| Overload Protection System | Low oil and overload protection, CO monitoring | Automatic shutdown during carbon monoxide detection |
| Low Oil Protection | Yes | Yes |
| Carbon Monoxide Monitoring | Yes | Yes |
| Included equipment | ||
| Mobility Components | Not available | Telescopic handle, two 7-inch never-flat wheels |
| Starting Components | Recoil, Electric | Not available |
| Fuel Connection Components | Not available | Automatic fuel-switching technology |
| Included Accessories | Oil, funnel, tool kit, propane hose, RV adapter, cover, battery, and wheel kit | Dual 2.4A USB adapter, emergency battery charger, LPG hose, tool kit, oil funnel |
| Warranty & identification | ||
| Residential Warranty | Not available | 2 |
| Commercial Warranty | 3 | 2 |
| Additional specs | ||
| Summary | The Firman T04073 is a 4,000-watt tri-fuel generator that runs on gasoline, propane, or natural gas. On gasoline, it delivers 5,000 starting watts and 4,000 running watts, enough to power a refrigerator, microwave, and multiple household circuits simultaneously. On propane, output drops to 3,600 running watts, and on natural gas it falls to 3,200 running watts. This fuel flexibility means users can switch between sources based on availability and cost, a significant advantage during extended outages or in remote locations where one fuel type may be scarce.
The T04073 targets homeowners, RV owners, and job site operators who need reliable backup power without the commitment to a single fuel source. Its 5-gallon tank runs for 14 hours at 25% load on gasoline, translating to roughly one week of emergency backup if you run it a few hours per day. The unit includes a wheel kit, making it easier to position despite its 123.4-pound weight. | The AIVOLT VS8000411 is a dual-fuel generator with 6100 rated watts and 8000 peak watts. |
- Most PowerfulAIVOLT VS80004116100W running
- QuietestAIVOLT VS800041162 dB
- Longest RuntimeFirman T0407312h at 50% load
Where to buy
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Firman T04073
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AIVOLT VS8000411
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