Firman P03504 vs WEN DF475T
What is the difference?
The Firman P03504 has 3.55 kW of running power, 4.45 kW peak. The WEN DF475T has 3.8 kW of running power, 4.75 kW peak.
The Firman P03504 runs on gasoline, the WEN DF475T is dual-fuel.
The Firman P03504 runs 14 h at half load, the WEN DF475T runs 11 h at half load. The Firman P03504 runs longer on a tank.
The Firman P03504 has a 5 gal tank, the WEN DF475T has a 4 gal tank.
The Firman P03504 has a 3-year warranty, the WEN DF475T has a 2-year warranty.
The Firman P03504 has 120 V AC output, the WEN DF475T 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 P03504 | WEN DF475T | |
|---|---|---|
| Running W | 3550 | 3800 |
| Peak W | 4450 | 4750 |
| Fuel | gasoline | dual-fuel |
| Tank (gal) | 5 | 4 |
| Run time @50 % (h) | 14 | 11 |
| Noise (dB) | 75 | — |
| CO shutoff | yes | — |
| Weight (lb) | 108 | — |
| Warranty (yr) | 3 | 2 |
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Specs as read from manufacturer pages on 2026-11-04 / 2026-10-25. 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 P03504 or WEN DF475T?
The WEN DF475T. More running watts: 3800 W vs 3550 W.
Which has the longer warranty, Firman P03504 or WEN DF475T?
The Firman P03504. Longer warranty: 3 years vs 2 years.