Firman W03383 vs WEN DF475X
What is the difference?
The Firman W03383 has 3.3 kW of running power, 3.65 kW peak. The WEN DF475X has 3.8 kW of running power, 4.75 kW peak.
The Firman W03383 runs on gasoline, the WEN DF475X is dual-fuel.
The Firman W03383 has a 1.8 gal tank, the WEN DF475X has a 4 gal tank.
The Firman W03383 has a 3-year warranty, the WEN DF475X has a 2-year warranty.
The Firman W03383 has 120 V AC output, the WEN DF475X 120/240 V. Only 240 V output can run 240 V loads such as many well pumps, dryers and central AC.
Specs side by side
| Firman W03383 | WEN DF475X | |
|---|---|---|
| Running W | 3300 | 3800 |
| Peak W | 3650 | 4750 |
| Fuel | gasoline | dual-fuel |
| Tank (gal) | 1.8 | 4 |
| Run time @50 % (h) | — | 11 |
| Noise (dB) | — | — |
| CO shutoff | — | yes |
| Weight (lb) | 901 | — |
| Warranty (yr) | 3 | 2 |
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Specs as read from manufacturer pages on 2026-10-26 / 2026-10-31. Specs one maker does not list are left out of the comparison. Sponsored links; we may earn a commission.
Common questions
Which has more running watts, Firman W03383 or WEN DF475X?
The WEN DF475X. More running watts: 3800 W vs 3300 W.
Which has the longer warranty, Firman W03383 or WEN DF475X?
The Firman W03383. Longer warranty: 3 years vs 2 years.