Compare Generators Side-by-Side
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- Firman T04073
- Generac #8063 GP9500ETF
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 | Generac #8063 GP9500ETF |
|---|---|---|
| General | ||
| Product type | Generator | Generator |
| Fuel | Tri-Fuel | Tri-Fuel |
| Inverter | No | No |
| Parallel capable | No | No |
| RV ready | No | Yes |
| Running watts | 4000 W | Winner: Winner: 9500 W |
| Starting watts | 5000 W | Winner: Winner: 12500 W |
| Noise (lower limit) | Winner: Winner: 67 dB | 0 dB |
| Weight | Winner: Winner: 123.4 lbs | 219 lbs |
| Run time @50% load | Winner: Winner: 12 h | 9.5 h |
| Run time @25% load | 14 h | 14 h |
| Fuel tank | 5 gal | 7.5 gal |
| Fuel gauge | Yes | Yes |
| Approx. dimensions (L × W × H) | 29.8 x 27.5 x 26.1 | 27.5 x 27.1 x 27.6 |
| Electrical | ||
| Voltage (AC) | 120/240 | 120/240 |
| Voltage (DC) | Not available | Not available |
| GFCI outlets | Yes | Yes |
| Covered outlets | Yes | Yes |
| Automatic Voltage Regulation | Yes | Yes |
| THD | 11%-14% % | Not available |
| Engine | ||
| Engine | 223 cc OHV 4-stroke, cast iron sleeve | OHV 4-stroke |
| Alternator | Not available | Not available |
| Starting system | Recoil, Electric | Recoil, Electric |
| Warranty | ||
| Warranty | 3 years | 3 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 4000 W | 9500 W |
| Starting watts | 5000 W | 12500 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 | 9.5 h |
| Run time @25% load | Not available | 14 h |
| Natural gas | Not available | Not available |
| Running watts | 3200 W | 7000 W |
| Starting watts | 4000 W | 9000 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 | 8550 W |
| Starting watts | 4500 W | 11250 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 | 4.5 h |
| Run time @25% load | Not available | 6 h |
| Other | ||
| Data center | Not available | Not available |
| Indicators | true | false |
| 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 | 696471104523 |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 4000 | 9500 |
| Running Watts (Propane) | 3600 | 8550 |
| Running Watts (Natural Gas) | 3200 | 7000 |
| Starting Watts (Gasoline) | 5000 | 12500 |
| Starting Watts (Propane) | 4500 | 11250 |
| Starting Watts (Natural Gas) | 4000 | 9000 |
| Runtime @ 50% Load (Gasoline) | 14 | 9.5 |
| Runtime @ 50% Load (Propane) | 9 | 4.5 |
| Runtime @ 25% Load (Gasoline) | Not available | 14 |
| Runtime @ 25% Load (Propane) | Not available | 6 |
| 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 120/240V 30A (L14-30R); 1x 120/240V 50A (14-50R) |
| Electrical & power | ||
| Frequency | 60 | 60 |
| Engine & construction | ||
| Engine Type | 223 cc OHV 4-stroke | OHV 4-stroke |
| Engine Displacement | 223 | 400 |
| Cylinder Sleeve | cast iron | Not available |
| Engine Oil Type | Not available | 10W-30 / SAE 30 |
| Runtime & fuel system | ||
| Runtime @ 25% Load (Gasoline) | Not available | 14 |
| Runtime @ 50% Load (Gasoline) | 14 | 9.5 |
| Runtime @ 50% Load (Propane) | 9 | 4.5 |
| Safety & compliance | ||
| Overload Protection System | Low oil and overload protection, CO monitoring | Low oil and overload protection, CO monitoring |
| Low Oil Protection | Yes | Yes |
| Carbon Monoxide Monitoring | Yes | Yes |
| Included equipment | ||
| Mobility Components | Not available | Yes |
| Starting Components | Recoil, Electric | Recoil, Electric |
| Fuel Connection Components | Not available | propane hose |
| Included Accessories | Oil, funnel, tool kit, propane hose, RV adapter, cover, battery, and wheel kit | Oil, propane hose, battery, and wheel kit |
| Warranty & identification | ||
| Residential Warranty | Not available | 3 |
| Commercial Warranty | 3 | Not available |
| 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 Generac GP9500ETF is a 9,500-watt tri-fuel generator built for whole-house backup and job site power. Its ability to run on gasoline, propane, or natural gas means users gain real fuel flexibility when one source becomes scarce during extended outages. The 12,500 starting watts provide enough surge capacity to handle motor-driven loads like well pumps and air handler fans without tripping breakers. This is a stationary workhorse, not a portable unit. |
- Most PowerfulGenerac #8063 GP9500ETF9500W running
- QuietestFirman T0407367 dB
- Longest RuntimeFirman T0407312h at 50% load
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Firman T04073
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Generac #8063 GP9500ETF
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