Compare Generators Side-by-Side
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- DuroMax XP15000HXT
- Firman H08051
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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 | DuroMax XP15000HXT | Firman H08051 |
|---|---|---|
| General | ||
| Product type | Generator | Generator |
| Fuel | Tri-Fuel | Dual-Fuel |
| Inverter | No | No |
| Parallel capable | No | No |
| RV ready | Yes | Yes |
| Running watts | Winner: Winner: 12000 W | 8000 W |
| Starting watts | Winner: Winner: 15000 W | 10000 W |
| Noise (lower limit) | 78 dB | Winner: Winner: 74 dB |
| Weight | 362 lbs | Winner: Winner: 212 lbs |
| Run time @50% load | Winner: Winner: 12 h | Winner: Winner: 12 h |
| Run time @25% load | 17.9 h | Not available |
| Fuel tank | 13.2 gal | 8 gal |
| Fuel gauge | Yes | Yes |
| Approx. dimensions (L × W × H) | 36 x 33.2 x 32 | 30.2 x 27.5 x 26.3 |
| 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 | 12 % | 25 % |
| Engine | ||
| Engine | 670 cc OHV 4-stroke, cast iron sleeve | Firman Max-Pro Series OHV 4-stroke, cast iron sleeve |
| Alternator | Not available | Not available |
| Starting system | Recoil, Electric, Remote | Recoil, Electric |
| Warranty | ||
| Warranty | 5 years | 3 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 12000 W | 8000 W |
| Starting watts | 15000 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 | 12 h | 12 h |
| Run time @25% load | 17.9 h | Not available |
| Natural gas | Not available | Not available |
| Running watts | 10260 W | Not available |
| Starting watts | 12825 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 | 11400 W | 7250 W |
| Starting watts | 14250 W | 9050 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 | 2.8 h | 5 h |
| Run time @25% load | 4.1 h | Not available |
| Other | ||
| Data center | Not available | Not available |
| Indicators | true | false |
| Compliance | CARB, EPA | CARB, EPA |
| Security | Not available | Not available |
| Spark arrestor | Yes | Yes |
| Neutral | true | Bonded to frame |
| UPC | 811640016852 | 840876180518 |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 12000 | 8000 |
| Running Watts (Propane) | 11400 | 7250 |
| Running Watts (Natural Gas) | 10260 | Not available |
| Starting Watts (Gasoline) | 15000 | 10000 |
| Starting Watts (Propane) | 14250 | 9050 |
| Starting Watts (Natural Gas) | 12825 | Not available |
| Runtime @ 50% Load (Gasoline) | 12 | 12 |
| Runtime @ 50% Load (Propane) | 2.8 | 5 |
| Runtime @ 25% Load (Gasoline) | 17.9 | Not available |
| Runtime @ 25% Load (Propane) | 4.1 | Not available |
| AC Outlet Types | 5x Duplex 120V 20A (5-20R) GFCI; 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 | OHV 4-stroke | OHV 4-stroke |
| Engine Displacement | 670 | 439 |
| Cylinder Sleeve | cast iron sleeve | Cast iron |
| Alternator Winding Material | Copper windings | Not available |
| Engine Oil Type | 10W-30 | Not available |
| Runtime & fuel system | ||
| Runtime @ 25% Load (Gasoline) | 17.9 | Not available |
| Runtime @ 50% Load (Gasoline) | 12 | 12 |
| Runtime @ 50% Load (Propane) | 2.8 | 5 |
| 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 | No |
| Included equipment | ||
| Mobility Components | Yes | Wheel kit |
| Starting Components | Recoil, Electric, Remote | Recoil, Electric |
| Fuel Connection Components | Not available | Propane hose |
| Included Accessories | Funnel, tool kit, key fob, natural gas hose with NPT adapter, propane hose, battery, and wheel kit | Oil, funnel, tool kit, propane hose, battery, and wheel kit |
| Warranty & identification | ||
| Commercial Warranty | Not available | 3 |
| Additional specs | ||
| Summary | The DuroMax XP15000HXT is a 12,000-watt tri-fuel generator built for stationary backup power and job site work. It runs on gasoline, propane, or natural gas, giving users flexibility to match fuel availability to their location. The 670cc OHV engine delivers 15,000 peak watts on startup, enough to handle the inrush demands of air conditioners, well pumps, and heavy power tools. At 12,000 running watts, it sustains refrigerators, furnaces, and multiple circuits simultaneously. This is a home-backup or construction-grade machine, not a portable camping unit. | The Firman H08051 is an 8,000-watt dual-fuel generator built to power job sites, homes during outages, and RV setups. Running on gasoline, it delivers 8,000 watts continuously and 10,000 watts at startup, enough to run a refrigerator, microwave, and multiple power tools at once. Switch to propane and the output drops to 7,250 watts running and 9,050 watts starting, a trade-off for fuel flexibility and longer shelf life. The 439cc cast-iron engine is engineered for durability in commercial and residential use. At 212 pounds, this is a stationary or semi-portable unit, not a grab-and-go machine. |
- Most PowerfulDuroMax XP15000HXT12000W running
- QuietestFirman H0805174 dB
- Longest RuntimeDuroMax XP15000HXT12h at 50% load
Where to buy
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DuroMax XP15000HXT
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Firman H08051
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