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 W03381
- Genmax GM3500iAED
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 @25%
h
Running watts by fuel
Shows how output changes across gasoline/propane/natural gas (when available).
| Specification | Firman W03381 | Genmax GM3500iAED |
|---|---|---|
| General | ||
| Product type | Generator | Generator |
| Fuel | Gasoline | Dual-Fuel |
| Inverter | Yes | Yes |
| Parallel capable | Yes | Yes |
| RV ready | Yes | No |
| Running watts | Winner: Winner: 3300 W | 3200 W |
| Starting watts | Winner: Winner: 3650 W | 3500 W |
| Noise (lower limit) | Winner: Winner: 58 dB | 62 dB |
| Weight | 87 lbs | Winner: Winner: 56.2 lbs |
| Run time @50% load | Not available | Not available |
| Run time @25% load | Winner: Winner: 10 h | 9 h |
| Fuel tank | 1.8 gal | 1.7 gal |
| Fuel gauge | No | Yes |
| Approx. dimensions (L × W × H) | 23.2 x 17.8 x 17.9 | 20.9 x 12.2 x 19.7 |
| Electrical | ||
| Voltage (AC) | 120 | 120 |
| Voltage (DC) | 12 | 5 |
| GFCI outlets | No | No |
| Covered outlets | Yes | Yes |
| Automatic Voltage Regulation | Yes | Yes |
| THD | 3 % | ≤3% % |
| Engine | ||
| Engine | 193 cc Firman Max-Pro Series OHV 4-Stroke, Cast Iron Sleeve | 145 cc OHV 4-stroke |
| Alternator | Not available | Not available |
| Starting system | Recoil | Recoil, Electric, Remote |
| Warranty | ||
| Warranty | 3 years | 1 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 3300 W | 3200 W |
| Starting watts | 3650 W | 3500 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 | 10 h | 8 h |
| Propane | Not available | Not available |
| Running watts | Not available | 2800 W |
| Starting watts | Not available | 3100 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 | 16 h |
| 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 | Floating | true |
| UPC | 840876133811 | 713424639021 |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 3300 | 3200 |
| Running Watts (Propane) | Not available | 2800 |
| Starting Watts (Gasoline) | 3650 | 3500 |
| Starting Watts (Propane) | Not available | 3100 |
| Runtime @ 25% Load (Gasoline) | 10 | 8 |
| Runtime @ 25% Load (Propane) | Not available | 16 |
| AC Outlet Types | 1x Duplex 120V 20A (5-20R); 1x 120V 30A (TT-30R) | 1x Duplex 120V 20A (5-20R) 1x 120V 30A (L5-30R) |
| Electrical & power | ||
| Frequency | 60 | 60 |
| Engine & construction | ||
| Engine Type | OHV 4-Stroke | OHV 4-stroke |
| Engine Displacement | 193 | 145 |
| Cylinder Sleeve | Cast iron sleeve | Not available |
| Engine Oil Type | 10W-30 | 10W-30 |
| Runtime & fuel system | ||
| Runtime @ 25% Load (Gasoline) | 10 | 8 |
| Safety & compliance | ||
| Overload Protection System | Low oil and overload protection | Not available |
| Low Oil Protection | Yes | Yes |
| Carbon Monoxide Monitoring | No | Yes |
| Included equipment | ||
| Starting Components | Recoil | Not available |
| Included Accessories | Oil, funnel, tool kit, and battery charging cables | Funnel, tool kit, key fob, propane hose, RV adapter, and battery |
| Warranty & identification | ||
| Commercial Warranty | 3 | Not available |
| Additional specs | ||
| Summary | The Firman W03381 is a 3300-watt inverter generator built around a 193cc OHV 4-stroke engine with a cast iron sleeve. This wattage puts it in the mid-range portable segment, capable of powering a refrigerator, microwave, and several household circuits simultaneously, or running a single large tool on a job site. The 3650-watt starting capacity handles the inrush demand of compressors and air conditioning units. Because the W03381 runs on gasoline with a 1.8-gallon tank, users will find a 10-hour runtime at 25% load, which translates to roughly 2.5 hours of continuous full-load operation before refueling becomes necessary. The inverter topology and 3% THD output mean sensitive electronics like laptops, phones, and televisions receive stable, clean power without risk of damage. At 58 decibels, this generator operates at a volume comparable to normal conversation, making it suitable for residential neighborhoods and RV parks where noise restrictions apply. | The Genmax GM3500iAED is a 3,200-watt dual-fuel inverter generator that runs on gasoline or propane. At 56.2 lbs, it handles essential household loads like refrigerators and small power tools while remaining portable enough for camping or job sites. The 62 dB noise level keeps it residential-friendly. |
- Most PowerfulFirman W033813300W running
- QuietestFirman W0338158 dB
- Longest Runtimeh at 50% load
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Firman W03381
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