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 3.9. The Generac GP9500E Tri Fuel leads on CO safety, fuel options and run time. The Westinghouse WGen9500DF wins on value and starting. The Westinghouse WGen9500DF costs $170 less ($999 vs $1,169).
Westinghouse WGen9500DF
#22 in LargeFull review
A large dual-fuel generator for whole-home backup through a 50 A or 30 A transfer switch. Worth it only at a clear discount to the newer CO-sensor models, since it lacks CO shutoff.
Amazon $999$999
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 CO safety (shuts off when carbon monoxide builds up vs no CO shutoff), fuel options (gasoline, propane or natural gas vs gasoline or propane) and run time (9.5 hours on a tank at 50% load vs 8 hours on a tank at 50% load).
- Choose the Westinghouse WGen9500DF for value ($0.11 per running watt vs $0.12 per running watt) and starting (electric start with a remote fob or app vs push-button electric start).
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 | Westinghouse WGen9500DF |
|---|---|---|
| Overall rating | 4.3/5 | 3.9/5 |
| Value 30% | 75 $0.12 per running watt | 85 $0.11 per running watt |
| Run time 15% | 55 9.5 hours on a tank at 50% load | 40 8 hours on a tank at 50% load |
| Fuel options 15% | 100 gasoline, propane or natural gas | 70 gasoline or propane |
| 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 | 0 no CO shutoff |
| Warranty 10% | 67 3-year warranty | 67 3-year warranty |
| Starting 5% | 80 push-button electric start | 100 electric start with a remote fob or app |
Independent measurements
Generac GP9500E Tri Fuel
No independent test published yet.
Westinghouse WGen9500DF
| Tested by | Noise | Run time | Max output | Conditions |
|---|---|---|---|---|
| Bob Vila | 90 dBA | - | - | Hands-on review: a decibel meter read 89 to 90 dB from about 6 ft, the same on gasoline and propane; load not stated. |
Specifications
| Generac GP9500E Tri Fuel | Westinghouse WGen9500DF | |
|---|---|---|
| Output | ||
| Gasoline | 9,500 W running, 12,500 W starting | 9,500 W running, 12,500 W starting |
| Propane | 8,550 W running, 11,250 W starting | 8,500 W running, 11,200 W starting |
| Natural gas | 7,000 W running, 9,000 W starting | - |
| Outlets | 2 × 120 V, L14-30, 14-50 | 4 × 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 | $0.12 | $0.11 |
| Fuel and run time | ||
| Fuel | Gasoline, propane, natural gas | Gasoline, propane |
| Tank | 7.5 gal | 6.6 gal |
| Run time (gasoline) | 9.5 hr at 50% load | 8 hr at 50% load |
| Run time (propane, 20 lb tank) | 4.5 hr | 7 hr |
| Engine | 500 cc | 457 cc |
| Noise and safety | ||
| Rated noise | - | 74 dBA |
| Measured noise | - | 90 dBA (Bob Vila) |
| CO shutoff | Yes | No |
| CARB compliant | No | No |
| Build | ||
| Starting | Electric and recoil | Remote, electric and recoil |
| Wheels | Yes | Yes |
| Dimensions | 27.5 x 27.1 x 27.6 in | 27.2 x 26.1 x 26.5 in |
| Weight | 219 lb | 211 lb |
| Warranty | 3 years | 3 years |
| Released | 2025-05 | 2020-08 |