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 H03654
- Sportsman GEN4000DF-SS
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 H03654 | Sportsman GEN4000DF-SS |
|---|---|---|
| General | ||
| Product type | Generator | Generator |
| Fuel | Dual-Fuel | Dual-Fuel |
| Inverter | No | No |
| Parallel capable | No | No |
| RV ready | Yes | Yes |
| Running watts | Winner: Winner: 3650 W | 3500 W |
| Starting watts | Winner: Winner: 4550 W | 4000 W |
| Noise (lower limit) | Winner: Winner: 67 dB | 69 dB |
| Weight | 119.5 lbs | Winner: Winner: 91 lbs |
| Run time @50% load | Winner: Winner: 14 h | 10 h |
| Run time @25% load | Not available | Not available |
| Fuel tank | 5 gal | 3.9 gal |
| Fuel gauge | Yes | No |
| Approx. dimensions (L × W × H) | 24.7 x 21.8 x 21.6 | 23 x 19.5 x 17.5 |
| Electrical | ||
| Voltage (AC) | 120V 60 Hz | 120 |
| Voltage (DC) | Not available | 12 |
| GFCI outlets | No | No |
| Covered outlets | Yes | No |
| Automatic Voltage Regulation | Yes | Yes |
| THD | 25 % | Not available |
| Engine | ||
| Engine | 208 cc Firman Max-Pro Series OHV 4-stroke, cast iron sleeve | 212 cc OHV 4-stroke |
| Alternator | Not available | Not available |
| Starting system | Recoil, Electric | Recoil |
| Warranty | ||
| Warranty | 3 years | 1 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 3650 W | 3500 W |
| Starting watts | 4550 W | 4000 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 | 10 h |
| Run time @25% load | Not available | Not available |
| Propane | Not available | Not available |
| Running watts | 3300 W | 3100 W |
| Starting watts | 4100 W | 3600 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 | 12 h |
| Run time @25% load | Not available | Not available |
| Other | ||
| Data center | Not available | Not available |
| Indicators | false | false |
| Compliance | EPA, ANSI/PGMA G300-2023 | EPA |
| Security | Not available | Not available |
| Spark arrestor | Yes | Yes |
| Neutral | Floating | Not available |
| UPC | 840876136546 | 27077082357 |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 3650 | 3500 |
| Running Watts (Propane) | 3300 | 3100 |
| Starting Watts (Gasoline) | 4550 | 4000 |
| Starting Watts (Propane) | 4100 | 3600 |
| Runtime @ 50% Load (Gasoline) | 14 | 10 |
| Runtime @ 50% Load (Propane) | Not available | 12 |
| AC Outlet Types | 1x Duplex 120V 20A (5-20R); 1x 120V 30A (L5-30R); 1x 120V 30A (TT-30R) | 2x Duplex 120V 20A (5-20R) and 1x 120V 30A (TT-30R) |
| Electrical & power | ||
| Frequency | 60 | 60 |
| Engine & construction | ||
| Engine Type | Max-Pro Series OHV 4-stroke | 212 cc OHV 4-stroke |
| Engine Displacement | 208 | 212 |
| Cylinder Sleeve | cast iron sleeve | Not available |
| Engine Oil Type | Not available | SAE10W-30 |
| Runtime & fuel system | ||
| Runtime @ 50% Load (Gasoline) | 14 | 10 |
| Runtime @ 50% Load (Propane) | Not available | 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 | Recoil, Electric | Recoil |
| Included Accessories | Oil, funnel, tool kit, propane hose, battery, and wheel kit | Funnel, tool kit, propane hose, and battery charging cables |
| Warranty & identification | ||
| Residential Warranty | Not available | 1 |
| Commercial Warranty | 3 | 1 |
| Additional specs | ||
| Summary | The Firman H03654 is a 3650-watt dual-fuel generator built for users who need flexible fuel options and moderate runtime between refueling cycles. Running on gasoline, it delivers 3650 watts continuously and 4550 watts at startup, which means it can power a refrigerator, microwave, and several lights simultaneously, or run a table saw and air compressor on a job site. On propane, output drops to 3300 watts running and 4100 watts starting, trading some power for the convenience of bottled fuel storage. The dual-fuel capability matters most during emergencies when one fuel type may be scarce, or for users who prefer propane's longer shelf life for seasonal equipment. At 119.5 pounds with a wheel kit included, this unit sits at the threshold between portable and stationary. It moves, but moving it requires planning. | The Sportsman GEN4000DF-SS is a dual fuel generator capable of delivering 4,000 surge watts and 3,500 running watts, suitable for powering RVs, household appliances, and power tools. |
- Most PowerfulFirman H036543650W running
- QuietestFirman H0365467 dB
- Longest RuntimeFirman H0365414h at 50% load
Where to buy
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Firman H03654
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