Firman H08051 Dual Fuel 8000W vs Generac GP8000E COsense
Both units carry the same best-fuel running rating: 8,000 W. The Firman H08051 Dual Fuel 8000W offers more fuel flexibility (gasoline, propane) where the Generac GP8000E COsense runs on gasoline. The Firman H08051 Dual Fuel 8000W runs longer at half load — 12 hours on its 8-gallon tank vs 10 hours.
| Firman H08051 Dual Fuel 8000W | Generac GP8000E COsense | |
|---|---|---|
| Type | portable | portable |
| Fuel | gasoline, propane | gasoline |
| Running watts (gas / LP for standby) | 8000 W | 8000 W |
| Starting watts (gas) | 10000 W | 10000 W |
| Running watts (propane) | 7250 W | — |
| Starting watts (propane) | 9050 W | — |
| Noise level | 74 dBA | — |
| Runtime at 50% load (gas) | 12 h | 10 h |
| Fuel tank | 8 gal | 7.9 gal |
| Output voltage | 120/240V | 120/240V |
| Transfer-switch-ready outlet | — | 30 A |
| Start type | electric | electric |
| CO safety shutoff | — | Yes |
| Engine displacement | 439 cc | 420 cc |
| Weight | 212 lb | 198 lb |
Frequently asked questions
Which costs less to run, the Firman H08051 Dual Fuel 8000W or the Generac GP8000E COsense?
Estimated fuel for 24 hours at about 50% load: $51 on gasoline for the Firman H08051 Dual Fuel 8000W vs $61 on gasoline for the Generac GP8000E COsense, at national average prices. These are spec-sheet-derived estimates — the assumptions are on the methodology page, and different fuels make this a cost comparison, not an efficiency ranking.
Where do these specifications come from?
Every record on BackupAtlas is hand-curated from manufacturer documentation and spec sheets, and each generator page links to its source document.