Champion 11,500-Watt Dual Fuel
#13 in LargeFull review
A large dual-fuel generator for backing up most of a home, central air included, through a transfer switch. Its 14-50R also suits 50 A RV owners.
Amazon $1,159$1,159
The Champion 11,500-Watt Dual Fuel is the better portable generator overall, rated 4.2 to 4.0. The Champion 11,500-Watt Dual Fuel leads on value. The FIRMAN T09275 wins on fuel options and run time. The Champion 11,500-Watt Dual Fuel costs $548.66 less ($1,159 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 Champion 11,500-Watt Dual Fuel for value ($0.13 per running watt vs $0.19 per running watt).
- Choose the FIRMAN T09275 for fuel options (gasoline, propane or natural gas vs gasoline or propane) and run time (11 hours on a tank at 50% load vs 10 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 | Champion 11,500-Watt Dual Fuel | FIRMAN T09275 |
|---|---|---|
| Overall rating | 4.2/5 | 4.0/5 |
| Value 30% | 73 $0.13 per running watt | 38 $0.19 per running watt |
| Run time 15% | 60 10 hours on a tank at 50% load | 70 11 hours on a tank at 50% load |
| Fuel options 15% | 70 gasoline or propane | 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
| Champion 11,500-Watt Dual Fuel | FIRMAN T09275 | |
|---|---|---|
| Output | ||
| Gasoline | 9,200 W running, 11,500 W starting | 9,200 W running, 11,400 W starting |
| Propane | 8,280 W running, 10,350 W starting | 8,300 W running, 10,400 W starting |
| Natural gas | - | 6,900 W running, 8,650 W starting |
| Outlets | 4 × 120 V, L14-30, 14-50 | 2 × 120 V, L5-30, L14-30, 14-50 |
| Transfer switch ready | Yes, 240 V | Yes, 240 V |
| Price per watt | $0.13 | $0.19 |
| Fuel and run time | ||
| Fuel | Gasoline, propane | Gasoline, propane, natural gas |
| Tank | 7.7 gal | 9 gal |
| Run time (gasoline) | 10 hr at 50% load | 11 hr at 50% load |
| Run time (propane, 20 lb tank) | 5 hr | - |
| Engine | 459 cc | 459 cc |
| Noise and safety | ||
| Rated noise | 74 dBA | 76 dBA |
| CO shutoff | Yes | Yes |
| CARB compliant | No | - |
| Build | ||
| Starting | Electric and recoil | Electric and recoil |
| Wheels | Yes | Yes |
| Dimensions | 28.9 x 28 x 26.2 in | 31 x 29.4 x 27 in |
| Weight | 209 lb | 217.5 lb |
| Warranty | 3 years | 3 years |
| Released | 2025-02 | 2022-09 |