Generac GP9500E Tri Fuel
#4 in LargeFull review
A large tri-fuel generator for whole-home backup through a transfer switch, best for homes with a natural gas line. It is one of the cheapest ways to get 9,500 W and three fuels.
Amazon $1,169$1,169
The Generac GP9500E Tri Fuel is the better portable generator overall, rated 4.3 to 4.0. The Generac GP9500E Tri Fuel leads on value. The FIRMAN T09275 wins on run time. The Generac GP9500E Tri Fuel costs $538.66 less ($1,169 vs $1,707.66).
FIRMAN T09275
#18 in LargeFull review
A large tri-fuel generator for homes with a natural gas line that want transfer-switch backup without storing fuel, at a premium price.
Amazon $1,707.66$1,707.66
Prices were last checked October 28, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Generac GP9500E Tri Fuel for value ($0.12 per running watt vs $0.19 per running watt).
- Choose the FIRMAN T09275 for run time (11 hours on a tank at 50% load vs 9.5 hours on a tank at 50% load).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every large portable generator; a clear win is highlighted. How we rank explains each one.
| Factor weight | Generac GP9500E Tri Fuel | FIRMAN T09275 |
|---|---|---|
| Overall rating | 4.3/5 | 4.0/5 |
| Value 30% | 75 $0.12 per running watt | 38 $0.19 per running watt |
| Run time 15% | 55 9.5 hours on a tank at 50% load | 70 11 hours on a tank at 50% load |
| Fuel options 15% | 100 gasoline, propane or natural gas | 100 gasoline, propane or natural gas |
| Home hookup 15% | 100 240 V outlet for a transfer switch | 100 240 V outlet for a transfer switch |
| CO safety 10% | 100 shuts off when carbon monoxide builds up | 100 shuts off when carbon monoxide builds up |
| Warranty 10% | 67 3-year warranty | 67 3-year warranty |
| Starting 5% | 80 push-button electric start | 80 push-button electric start |
Specifications
| Generac GP9500E Tri Fuel | FIRMAN T09275 | |
|---|---|---|
| Output | ||
| Gasoline | 9,500 W running, 12,500 W starting | 9,200 W running, 11,400 W starting |
| Propane | 8,550 W running, 11,250 W starting | 8,300 W running, 10,400 W starting |
| Natural gas | 7,000 W running, 9,000 W starting | 6,900 W running, 8,650 W starting |
| Outlets | 2 × 120 V, L14-30, 14-50 | 2 × 120 V, L5-30, L14-30, 14-50 |
| Transfer switch ready | Yes, 240 V | Yes, 240 V |
| Full power at 120 V | No | - |
| Price per watt | $0.12 | $0.19 |
| Fuel and run time | ||
| Fuel | Gasoline, propane, natural gas | Gasoline, propane, natural gas |
| Tank | 7.5 gal | 9 gal |
| Run time (gasoline) | 9.5 hr at 50% load | 11 hr at 50% load |
| Run time (propane, 20 lb tank) | 4.5 hr | - |
| Engine | 500 cc | 459 cc |
| Noise and safety | ||
| Rated noise | - | 76 dBA |
| CO shutoff | Yes | Yes |
| CARB compliant | No | - |
| Build | ||
| Starting | Electric and recoil | Electric and recoil |
| Wheels | Yes | Yes |
| Dimensions | 27.5 x 27.1 x 27.6 in | 31 x 29.4 x 27 in |
| Weight | 219 lb | 217.5 lb |
| Warranty | 3 years | 3 years |
| Released | 2025-05 | 2022-09 |