The Westinghouse WGen10500DFc is the better portable generator overall, rated 4.3 to 4.2. The Westinghouse WGen10500DFc leads on value and starting. The Generac GP9500E Tri Fuel EFI wins on fuel options and run time. The Westinghouse WGen10500DFc costs $300 less ($1,099 vs $1,399).
A large dual-fuel generator for whole-home backup through a 50 A transfer switch, with remote start and CO shutoff. Good value per watt for homeowners who can do without natural gas.
Amazon $1,099A large tri-fuel generator with fuel injection for whole-home backup, and the version to buy in California. Elsewhere the carbureted GP9500E does the same job for less.
Amazon $1,399Prices 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.
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 | Westinghouse WGen10500DFc | Generac GP9500E Tri Fuel EFI |
|---|---|---|
| Overall rating | 4.3/5 | 4.2/5 |
| Value 30% | 85 $0.10 per running watt | 60 $0.15 per running watt |
| Run time 15% | 55 9.5 hours on a tank at 50% load | 65 10.5 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% | 100 electric start with a remote fob or app | 80 push-button electric start |
| Westinghouse WGen10500DFc | Generac GP9500E Tri Fuel EFI | |
|---|---|---|
| Output | ||
| Gasoline | 10,500 W running, 13,500 W starting | 9,500 W running, 12,500 W starting |
| Propane | 9,500 W running, 12,500 W starting | 8,550 W running, 11,250 W starting |
| Natural gas | - | 7,000 W running, 9,000 W starting |
| Outlets | 4 × 120 V, L14-30, 14-50, USB | 2 × 120 V, L14-30, 14-50 |
| Transfer switch ready | Yes, 240 V | Yes, 240 V |
| Full power at 120 V | No | No |
| Total harmonic distortion | under 23% | - |
| Price per watt | $0.10 | $0.15 |
| Fuel and run time | ||
| Fuel | Gasoline, propane | Gasoline, propane, natural gas |
| Tank | 9.5 gal | 7.5 gal |
| Run time (gasoline) | 9.5 hr at 50% load | 10.5 hr at 50% load |
| Run time (propane, 20 lb tank) | 7 hr | 5 hr |
| Engine | 500 cc | 500 cc |
| Noise and safety | ||
| Rated noise | 74 dBA | - |
| CO shutoff | Yes | Yes |
| CARB compliant | No | Yes |
| Build | ||
| Starting | Remote, electric and recoil | Electric and recoil |
| Wheels | Yes | Yes |
| Dimensions | 28.6 x 29.3 x 26.8 in | 27.2 x 26.94 x 27 in |
| Weight | 230 lb | 227 lb |
| Warranty | 3 years | 3 years |
| Released | 2025-03 | 2025-03 |
