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
- Genmax GM6250iET
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 | Genmax GM6250iET |
|---|---|---|
| General | ||
| Product type | Generator | Generator |
| Fuel | Tri-Fuel | Tri-Fuel |
| Inverter | No | Yes |
| Parallel capable | No | Yes |
| RV ready | No | Yes |
| Running watts | 4000 W | Winner: Winner: 5500 W |
| Starting watts | 5000 W | Winner: Winner: 6250 W |
| Noise (lower limit) | 67 dB | Winner: Winner: 66 dB |
| Weight | 123.4 lbs | Winner: Winner: 102.6 lbs |
| Run time @50% load | Winner: Winner: 12 h | Not available |
| Run time @25% load | 14 h | 10 h |
| Fuel tank | 5 gal | 3 gal |
| Fuel gauge | Yes | Yes |
| Approx. dimensions (L × W × H) | 29.8 x 27.5 x 26.1 | 22.8 x 17.8 x 19.7 |
| Electrical | ||
| Voltage (AC) | 120/240 | 120/240 |
| Voltage (DC) | Not available | 5 |
| GFCI outlets | Yes | Yes |
| Covered outlets | Yes | Yes |
| Automatic Voltage Regulation | Yes | Yes |
| THD | 11%-14% % | 3 % |
| Engine | ||
| Engine | 223 cc OHV 4-stroke, cast iron sleeve | 224 cc OHV 4-stroke |
| Alternator | Not available | Not available |
| Starting system | Recoil, Electric | Recoil, Electric, Remote |
| Warranty | ||
| Warranty | 3 years | 3 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 4000 W | 5500 W |
| Starting watts | 5000 W | 6250 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 | 10 h |
| Natural gas | Not available | Not available |
| Running watts | 3200 W | 4500 W |
| Starting watts | 4000 W | 5000 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 | Not available | Not available |
| Run time @25% load | Not available | Not available |
| Propane | Not available | Not available |
| Running watts | 3600 W | 5000 W |
| Starting watts | 4500 W | 5500 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 | 9 h | Not available |
| Run time @25% load | Not available | 11 h |
| Other | ||
| Data center | Not available | Not available |
| Indicators | true | true |
| Compliance | CARB, EPA, ANSI/PGMA G300-2023 | EPA, ANSI/PGMA G300-2023 |
| Security | Not available | Not available |
| Spark arrestor | Yes | Yes |
| Neutral | true | true |
| UPC | 840876140734 | 784482491296 |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 4000 | 5500 |
| Running Watts (Propane) | 3600 | 5000 |
| Running Watts (Natural Gas) | 3200 | 4500 |
| Starting Watts (Gasoline) | 5000 | 6250 |
| Starting Watts (Propane) | 4500 | 5500 |
| Starting Watts (Natural Gas) | 4000 | 5000 |
| Runtime @ 50% Load (Gasoline) | 14 | Not available |
| Runtime @ 50% Load (Propane) | 9 | Not available |
| Runtime @ 25% Load (Gasoline) | Not available | 10 |
| Runtime @ 25% Load (Propane) | Not available | 11 |
| AC Outlet Types | 1x Duplex 120V 20A (5-20R) GFCI; 1x 120V 30A (L5-30R); 1x 120/240V 30A (L14-30R) | 1x Duplex 120V 20A (5-20R) GFCI; 1x 120V 30A (L5-30R); 1x 120/240V 50A (14-50R) |
| Electrical & power | ||
| Frequency | 60 | 60 |
| Engine & construction | ||
| Engine Type | 223 cc OHV 4-stroke | 224 cc OHV 4-stroke |
| Engine Displacement | 223 | 224 |
| Cylinder Sleeve | cast iron | Not available |
| Runtime & fuel system | ||
| Runtime @ 25% Load (Gasoline) | Not available | 10 |
| Runtime @ 50% Load (Gasoline) | 14 | Not available |
| Runtime @ 50% Load (Propane) | 9 | Not available |
| Safety & compliance | ||
| Overload Protection System | Low oil and overload protection, CO monitoring | Low oil and overload protection, CO monitoring |
| Low Oil Protection | Yes | No |
| Carbon Monoxide Monitoring | Yes | Yes |
| Included equipment | ||
| Starting Components | Recoil, Electric | Recoil, Electric, Remote |
| Included Accessories | Oil, funnel, tool kit, propane hose, RV adapter, cover, battery, and wheel kit | Funnel, tool kit, key fob, battery charger, cover, and battery |
| Warranty & identification | ||
| Commercial Warranty | 3 | 3 |
| 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 Genmax GM6250iET is a 5,500-watt tri-fuel inverter generator built for users who need substantial backup power without sacrificing electronics protection. Its 3% THD rating means it can safely power laptops, refrigerators, and air conditioning units simultaneously, while the tri-fuel capability lets owners switch between gasoline, propane, and natural gas depending on availability. This combination of clean power and fuel flexibility makes it a practical choice for RV owners, homeowners facing extended outages, and job sites where power quality matters as much as raw wattage. |
- Most PowerfulGenmax GM6250iET5500W running
- QuietestGenmax GM6250iET66 dB
- Longest RuntimeFirman T0407312h at 50% load
Where to buy
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Firman T04073
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