Head to head
Generac GP8000E COsense vs Firman T07571 Tri-Fuel
Generac · Portable Generator
Generac GP8000E COsense
~$979
8,000 W / 10,000 W surge · up to well pump or a small central AC
Firman · Portable Generator
Firman T07571 Tri-Fuel
~$999
7,500 W / 9,400 W surge · up to well pump or a small central AC
Quick takeThe Generac GP8000E COsense lists about $20 lower; the Generac GP8000E COsense puts out more sustained power (8,000 W).
| Spec | Generac GP8000E COsense | Firman T07571 Tri-Fuel |
|---|---|---|
| Approx. price | ~$979 | ~$999 |
| Type | Portable Generator | Portable Generator |
| Fuel | Gasoline | Tri Fuel (Gas/LP/NG) |
| Running / output watts | 8,000 W | 7,500 W |
| Starting / surge watts | 10,000 W | 9,400 W |
| Battery capacity | — | — |
| Expandable to | — | — |
| Noise | — | 74 dB |
| Runtime | up to 11 hrs @ 50% load (7.9 gal) | up to 12 hrs @ 25% load (8 gal gas); unlimited on NG hookup |
| Outlets | 4x 120V 20A (5-20R), 1x 120/240V 30A (L14-30R) | 1x 120V 20A GFCI duplex (5-20R), 1x 120V 30A (L5-30R), 1x 120/240V 30A (L14-30R), 1x 120/240V 50A (14-50R) |
| Fuel tank | 7.9 gal | 8 gal |
| Weight | 198 lbs | 213 lbs |
| Transfer-switch ready | Yes | Yes |
| Warranty | 3-year limited | 3-year limited |
Highlighted cell is the better figure for that row.
Owner pros and cons
Generac GP8000E COsense
- +8,000 running watts under $1,000 with electric start
- +PowerRush 10,000W surge starts well pumps and AC
- +L14-30R 240V ready for an interlock
- +COsense CO shutdown standard
- +11-hour half-load runtime on the 7.9-gal steel tank
- −Loud open-frame operation; no published dB spec
- −Non-inverter power — keep sensitive electronics buffered
- −Gasoline only; no propane option in this SKU
- −Recall history (2022 handle, 2026 carb leak) requires serial checks
- −198 lbs with a narrow wheelbase on rough ground
Firman T07571 Tri-Fuel
- +Cheapest credible tri-fuel path to NG-powered backup
- +LP and NG hoses included — no accessory hunt
- +50A 14-50R plus 30A outlets cover any transfer setup
- +Electric start with battery included
- +3-year warranty on paper, generous Costco returns in practice
- +Solid 213-lb frame with never-flat wheels
- −5,500W on natural gas is a steep derate
- −74 dB open-frame noise
- −Output sags at higher loads on NG in owner reports
- −Manual fuel-selection procedure trips up first-timers