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Select up to 4 generators to compare specs, power output, noise levels, runtime and more. Your compare URL is shareable.
- Firman P08008
- Powerhorse s12500t
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 P08008 | Powerhorse s12500t |
|---|---|---|
| General | ||
| Product type | Generator | Generator |
| Fuel | Gasoline | Gasoline |
| Inverter | No | No |
| Parallel capable | No | No |
| RV ready | Yes | No |
| Running watts | 8000 W | Winner: Winner: 9500 W |
| Starting watts | 10000 W | Winner: Winner: 12500 W |
| Noise (lower limit) | Winner: Winner: 74 dB | 97 dB |
| Weight | Winner: Winner: 208 lbs | 235 lbs |
| Run time @50% load | Winner: Winner: 12 h | 9 h |
| Run time @25% load | Not available | Not available |
| Fuel tank | 8 gal | 6.6 gal |
| Fuel gauge | Yes | Yes |
| Approx. dimensions (L × W × H) | 27.1 x 27.5 x 26.8 | 29.3 x 26.7 x 26.4 |
| 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 | 25 % | <23% % |
| Engine | ||
| Engine | 439 cc Firman Max-Pro Series OHV 4-stroke, cast iron sleeve | 457 cc OHV 4-stroke |
| Alternator | Not available | Not available |
| Starting system | Recoil, Electric, Remote | Recoil, Electric, Remote |
| Warranty | ||
| Warranty | 3 years | 2 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 8000 W | 9500 W |
| Starting watts | 10000 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 | 12 h | 9 h |
| Run time @25% load | Not available | Not available |
| Natural gas | Not available | Not available |
| Running watts | Not available | 7125 W |
| Starting watts | Not available | 9375 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 | Not available | 8550 W |
| Starting watts | Not available | 9375 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 |
| Other | ||
| Data center | Not available | Not available |
| Indicators | true | true |
| Compliance | EPA, ANSI/PGMA G300-2023 | EPA, ANSI/PGMA G300-2023 |
| Security | Not available | Not available |
| Spark arrestor | Yes | Yes |
| Neutral | true | true |
| UPC | 840876180082 | 840321764034 |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 8000 | 9500 |
| Running Watts (Propane) | Not available | 8550 |
| Running Watts (Natural Gas) | Not available | 7125 |
| Starting Watts (Gasoline) | 10000 | 12500 |
| Starting Watts (Propane) | Not available | 9375 |
| Starting Watts (Natural Gas) | Not available | 9375 |
| Runtime @ 50% Load (Gasoline) | 12 | 9 |
| AC Outlet Types | 1x Duplex 120V 20A (5-20R); 1x 120V 30A (L5-30R); 1x 120/240V 30A (L14-30R); 1x 120/240V 50A (14-50R) | 2x 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 | OHV 4-stroke, cast iron sleeve | OHV 4-stroke |
| Engine Displacement | 439 | 457 |
| Cylinder Sleeve | Cast iron sleeve | Not available |
| Runtime & fuel system | ||
| Runtime @ 50% Load (Gasoline) | 12 | 9 |
| Safety & compliance | ||
| Overload Protection System | Low oil and overload protection | Not available |
| Low Oil Protection | Yes | Yes |
| Carbon Monoxide Monitoring | Yes | Yes |
| Included equipment | ||
| Mobility Components | Not available | Yes |
| Starting Components | Recoil, Electric, Remote | Recoil, Electric, Remote |
| Fuel Connection Components | Not available | natural gas hose with NPT adapter, propane hose |
| Included Accessories | Oil, funnel, tool kit, key fob, RV adapter, battery, and wheel kit | Funnel, tool kit, key fob, natural gas hose with NPT adapter, propane hose, and wheel kit |
| Warranty & identification | ||
| Commercial Warranty | 3 | Not available |
| Part Number | Not available | 6075695 |
| Additional specs | ||
| Summary | The Firman P08008 is an 8,000-watt gas generator built for job sites, emergency backup, and outdoor events where sustained power matters more than portability. At 8,000 running watts and 10,000 peak watts, this unit can run a refrigerator, microwave, and power tools simultaneously, or handle the electrical load of a small RV. The 439cc cast-iron-sleeve engine burns gasoline, a fuel readily available at any gas station, and runs for 12 hours at half load on an 8-gallon tank. This runtime window means a single refueling cycle covers an overnight power outage or a full day of outdoor work. | The Powerhorse s12500t is a versatile 12,500-watt tri-fuel portable generator equipped with electric start and CO shutdown features, suitable for various power needs. |
- Most PowerfulPowerhorse s12500t9500W running
- QuietestFirman P0800874 dB
- Longest RuntimeFirman P0800812h at 50% load
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Firman P08008
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Powerhorse s12500t
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