Firman T04073 vs WEN DF480iX
What is the difference?
The Firman T04073 has 4 kW of running power, 5 kW peak. The WEN DF480iX has 4 kW of running power, 4.8 kW peak.
The Firman T04073 is tri-fuel, the WEN DF480iX is dual-fuel.
The Firman T04073 runs 14 h at half load, the WEN DF480iX runs 7 h at half load. The Firman T04073 runs longer on a tank.
The Firman T04073 has a 5 gal tank, the WEN DF480iX has a 1.9 gal tank.
The Firman T04073 has 120/240 V AC output, the WEN DF480iX 120 V. Only 240 V output can run 240 V loads such as many well pumps, dryers and central AC.
Specs side by side
| Firman T04073 | WEN DF480iX | |
|---|---|---|
| Running W | 4000 | 4000 |
| Peak W | 5000 | 4800 |
| Fuel | tri-fuel | dual-fuel |
| Tank (gal) | 5 | 1.9 |
| Run time @50 % (h) | 14 | 7 |
| Noise (dB) | — | 62 |
| CO shutoff | yes | yes |
| Weight (lb) | — | — |
| Warranty (yr) | — | 3 |
| Check on Amazon → | Check on Amazon → |
Specs as read from manufacturer pages on 2026-10-30 / 2026-10-25. Specs one maker does not list are left out of the comparison. Sponsored links; we may earn a commission.