FIRMAN WH03342 4125W Dual Fuel Inverter
A 4,125-watt dual-fuel inverter (3,300 running) from FIRMAN's Whisper series, with electric start, RV-ready outlets, a CO alert and parallel capability. It runs up to 9 hours at half load.
- Running watts
- 3,300 W
- Starting / surge watts
- 4,125 W
- Fuel
- gasoline, propane
- Best for
- RV trips, with propane as an option.
- Not for
- California, since FIRMAN says it isn't certified to ship there.
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Specifications
| Running watts | 3,300 W |
|---|---|
| Starting / surge watts | 4,125 W |
| Fuel | gasoline, propane |
| Inverter (clean power) | Yes |
| Parallel capable | Yes |
| Runtime at 50% load | 9 h |
|---|
| Noise | 58 dB(A) |
|---|---|
| Weight | 90 lb |
| CARB compliant | No |
|---|
Checked 29 October 2026. Sources: firmanpowerequipment.com.