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.
- DuroStar DS13000X
- Firman P08008
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 | DuroStar DS13000X | Firman P08008 |
|---|---|---|
| General | ||
| Product type | Generator | Generator |
| Fuel | Gasoline | Gasoline |
| Inverter | No | No |
| Parallel capable | No | No |
| RV ready | Yes | Yes |
| Running watts | Winner: Winner: 10500 W | 8000 W |
| Starting watts | Winner: Winner: 13000 W | 10000 W |
| Noise (lower limit) | Winner: Winner: 74 dB | Winner: Winner: 74 dB |
| Weight | 240 lbs | Winner: Winner: 208 lbs |
| Run time @50% load | 8.5 h | Winner: Winner: 12 h |
| Run time @25% load | 17 h | Not available |
| Fuel tank | 8.3 gal | 8 gal |
| Fuel gauge | Yes | Yes |
| Approx. dimensions (L × W × H) | 30 x 29 x 26 | 27.1 x 27.5 x 26.8 |
| Electrical | ||
| Voltage (AC) | 120/240 | 120/240 |
| Voltage (DC) | Not available | Not available |
| GFCI outlets | Yes | Yes |
| Covered outlets | No | Yes |
| Automatic Voltage Regulation | Yes | Yes |
| THD | 12 % | 25 % |
| Engine | ||
| Engine | 500 cc OHV 4-stroke, cast iron sleeve | 439 cc Firman Max-Pro Series OHV 4-stroke, cast iron sleeve |
| Alternator | Not available | Not available |
| Starting system | Recoil, Electric | Recoil, Electric, Remote |
| Warranty | ||
| Warranty | 5 years | 3 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 10500 W | 8000 W |
| Starting watts | 13000 W | 10000 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 | 8.5 h | 12 h |
| Run time @25% load | 17 h | Not available |
| Other | ||
| Data center | Not available | Not available |
| Indicators | true | true |
| Compliance | Carb, EPA | EPA, ANSI/PGMA G300-2023 |
| Security | Not available | Not available |
| Spark arrestor | Yes | Yes |
| Neutral | Not available | true |
| UPC | 811640016739 | 840876180082 |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 10500 | 8000 |
| Starting Watts (Gasoline) | 13000 | 10000 |
| Runtime @ 50% Load (Gasoline) | 8.5 | 12 |
| Runtime @ 25% Load (Gasoline) | 17 | Not available |
| AC Outlet Types | 2x Duplex 120V 20A (5-20R); 1x 120V 30A (L5-30R); 1x 120/240V 30A (L14-30R); 1x 120/240V 50A (14-50R) | 1x Duplex 120V 20A (5-20R); 1x 120V 30A (L5-30R); 1x 120/240V 30A (L14-30R); 1x 120/240V 50A (14-50R) |
| Electrical & power | ||
| Frequency | 60 | 60 |
| Engine & construction | ||
| Engine Type | 500 cc OHV 4-stroke, cast iron sleeve | OHV 4-stroke, cast iron sleeve |
| Engine Displacement | 500 | 439 |
| Cylinder Sleeve | Not available | Cast iron sleeve |
| Engine Oil Type | 10W-30 | Not available |
| Runtime & fuel system | ||
| Runtime @ 25% Load (Gasoline) | 17 | Not available |
| Runtime @ 50% Load (Gasoline) | 8.5 | 12 |
| Safety & compliance | ||
| Overload Protection System | Low oil and overload protection, CO monitoring | Low oil and overload protection |
| Low Oil Protection | Yes | Yes |
| Carbon Monoxide Monitoring | Yes | Yes |
| Included equipment | ||
| Starting Components | Not available | Recoil, Electric, Remote |
| Included Accessories | Funnel, tool kit, battery, and wheel kit | Oil, funnel, tool kit, key fob, RV adapter, battery, and wheel kit |
| Warranty & identification | ||
| Commercial Warranty | Not available | 3 |
| Additional specs | ||
| Summary | The DuroStar DS13000X is a 10,500-watt gasoline generator built to handle whole-home backup power and job site demands. With 13,000 peak watts and a 500cc OHV engine, this unit can run a full refrigerator, multiple air conditioning units, and power tools simultaneously. The 8.3-gallon fuel tank stretches runtime to 17 hours at 25% load, meaning users can maintain power through an entire night without refueling. At 50% load, the 8.5-hour runtime covers a typical workday, making this suitable for both emergency preparedness and extended outdoor use.
The DS13000X includes both recoil and electric start, so users avoid the frustration of pulling a cord in cold weather or after long storage. A 5-year warranty backs the unit, which is 60% longer than the 3.1-year industry average for this wattage class. The combination of power output, fuel capacity, and starting convenience positions this generator as a practical choice for homeowners and contractors who need reliable, extended-runtime power without the complexity of inverter technology. | 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. |
- Most PowerfulDuroStar DS13000X10500W running
- QuietestDuroStar DS13000X74 dB
- Longest RuntimeFirman P0800812h at 50% load
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DuroStar DS13000X
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Firman P08008
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