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| Specification | Generac #8917 GP18000EFI | Westinghouse WGen20000 |
|---|---|---|
| General | ||
| Product type | Generator | Generator |
| Fuel | Gasoline | Gasoline |
| Inverter | No | No |
| Parallel capable | No | No |
| RV ready | Yes | No |
| Running watts | 18000 W | Winner: Winner: 20000 W |
| Starting watts | 22500 W | Winner: Winner: 28000 W |
| Noise (lower limit) | 0 dB | Winner: Winner: 74 dB |
| Weight | Winner: Winner: 442.8 lbs | 540 lbs |
| Run time @50% load | 9 h | Winner: Winner: 11 h |
| Run time @25% load | Not available | 13 h |
| Fuel tank | 14.2 gal | 17.17 gal |
| Fuel gauge | Yes | Yes |
| Approx. dimensions (L × W × H) | 58.5 x 30.9 x 36.5 | 38 x 35 x 40.4 |
| Electrical | ||
| Voltage (AC) | 120/240 | 120/240 |
| Voltage (DC) | Not available | Not available |
| GFCI outlets | Yes | Yes |
| Covered outlets | Yes | Yes |
| Automatic Voltage Regulation | Yes | Yes |
| THD | <5% % | 5 % |
| Engine | ||
| Engine | Generac G-Force OVHI 4-stroke | OHV V-Twin, cast iron sleeve |
| Alternator | Not available | Not available |
| Starting system | Electric | Electric |
| Warranty | ||
| Warranty | 3 years | 3 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 18000 W | 20000 W |
| Starting watts | 22500 W | 28000 W |
| Running amps (120V) | Not available | Not available |
| Running amps (240V) | Not available | Not available |
| Peak amps (120V) | Not available | Not available |
| Peak amps (240V) | Not available | Not available |
| Run time @50% load | 9 h | 11 h |
| Run time @25% load | Not available | 13 h |
| Other | ||
| Data center | Not available | Not available |
| Indicators | true | false |
| Compliance | CARB, EPA | EPA |
| Security | Not available | Not available |
| Spark arrestor | Yes | Yes |
| Neutral | Bonded to Frame | true |
| UPC | 696471101324 | 850011336601 |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 18000 | 20000 |
| Starting Watts (Gasoline) | 22500 | 28000 |
| Runtime @ 50% Load (Gasoline) | 9 | 11 |
| Runtime @ 25% Load (Gasoline) | Not available | 13 |
| AC Outlet Types | 120/240V 50A (NEMA 14-50R), 120V 20A GFCI Duplex (NEMA 5-20R), 120V 30A Locking (NEMA L5-30R), 120/240V 30A Locking (NEMA L14-30R) | 2x Duplex 120V 20A (5-20R) GFCI; 1x 120V 30A (L5-30R); 2x 120/240V 30A (L14-30R); 2x 120/240V 50A (14-50R) |
| Electrical & power | ||
| Frequency | 60 | 60 |
| Engine & construction | ||
| Engine Type | Generac G-Force OVHI 4-stroke | OHV V-Twin |
| Engine Displacement | 816 | 999 |
| Cylinder Sleeve | Not available | cast iron sleeve |
| Alternator Winding Material | Not available | Copper |
| Engine Oil Type | 10W-30 / SAE30 | SAE 10W-30 |
| Runtime & fuel system | ||
| Runtime @ 25% Load (Gasoline) | Not available | 13 |
| Runtime @ 50% Load (Gasoline) | 9 | 11 |
| Controls & display | ||
| Display Type | Hour Meter | Not available |
| Safety & compliance | ||
| Overload Protection System | Not available | Low oil and overload protection |
| Low Oil Protection | Yes | Yes |
| Carbon Monoxide Monitoring | Yes | No |
| Included equipment | ||
| Mobility Components | 12" Never-flat Wheels, Folding Locking Handle | Not available |
| Starting Components | Electric Start, Battery Included | Not available |
| Included Accessories | Battery included | Oil, funnel, tool kit, battery, and wheel kit |
| Warranty & identification | ||
| Residential Warranty | 3 | Not available |
| Commercial Warranty | 2 | 3 |
| Part Number | 8917-0 | Not available |
| Additional specs | ||
| Summary | The Generac GP18000EFI is an 18,000 watt gasoline generator built for whole house backup and demanding job sites. With 22,500 peak watts, it can run central air conditioning, well pumps, electric ranges, and full household loads simultaneously. This is a stationary power solution for users who need utility replacement capacity. | The Westinghouse WGen20000TFc is a tri-fuel portable generator capable of producing up to 28,000 peak watts and 20,000 running watts, suitable for home backup and job site power needs. |