
Generac GP2500i vs Westinghouse iGen2800
Comparing the Generac GP2500i and Westinghouse iGen2800 inverter generators. Both deliver 2200 running watts, but differ in runtime, surge power, and noise.
- Generac #8251 GP2500i
- Westinghouse iGen2800
Comparison Overview
The Generac GP2500i and Westinghouse iGen2800 share the same 2200 running watts, making them direct competitors in the lightweight inverter generator category. Where they diverge is in surge capacity, runtime, and noise output. The Westinghouse iGen2800 offers 2800 starting watts compared to the Generac's 2500 starting watts, giving it a meaningful edge when powering appliances with high startup demands like small air conditioners or refrigerators.
Runtime is another notable difference. The iGen2800 stretches to 12 hours at 25% load, while the GP2500i manages 8 hours at 25% load and about 4.5 hours at half load. That extra endurance can matter a lot during overnight camping trips or extended power outages. On the noise front, the Westinghouse operates at 52 decibels, which is roughly the volume of a quiet conversation. Generac does not publish a noise rating for the GP2500i, so direct comparison there is difficult.
Both units weigh under 50 pounds, both run on gasoline, and both come with a 3-year warranty. The Generac GP2500i edges ahead slightly in overall scoring, but the Westinghouse iGen2800 brings stronger specs in several practical categories. Buyers who prioritize runtime and surge watts may lean toward the Westinghouse, while those who trust the Generac brand and value its broader dealer network may prefer the GP2500i.
Key takeaways
- Both deliver 2200 running watts with inverter-clean power safe for electronics
- Westinghouse iGen2800 provides 2800 starting watts versus Generac's 2500 starting watts
- Westinghouse runs up to 12 hours at 25% load, Generac manages 8 hours
- Both weigh under 50 pounds, making them easy to transport
- Westinghouse operates at a quiet 52 decibels, suitable for campground use
- Both include a 3-year warranty for long-term peace of mind
Best use cases
Choose the Generac GP2500i if you want a well-known brand with strong dealer and service support across the United States. Generac is one of the most recognized names in backup power, and finding replacement parts or warranty service tends to be straightforward. At 48 pounds, it is easy enough to load into a truck bed or carry to a tailgate. The 2200 running watts and 2500 starting watts will comfortably handle phone chargers, laptops, LED lights, a small TV, and a CPAP machine. If your typical use involves moderate loads and you value brand reputation, the GP2500i is a solid pick.
Choose the Westinghouse iGen2800 if runtime and starting power are higher on your priority list. The 12-hour runtime at 25% load is 50% longer than what the Generac offers, which makes a real difference if you are running the generator overnight at a campsite or during a storm-related outage. The 2800 starting watts also give you more headroom for appliances that draw a heavy surge when they kick on, like a small window AC unit or a sump pump. At 46.3 pounds, it is slightly lighter than the Generac, and its 52-decibel noise level is quiet enough for campground use without annoying neighbors.
Both generators produce clean inverter power safe for sensitive electronics, and both carry the same 3-year warranty. Neither is a bad choice for recreational use, emergency backup for essentials, or light job site tasks. The tradeoff really comes down to whether you value the Generac name and ecosystem or the Westinghouse's superior runtime and surge capacity.
Verdict & recommendation
If your priority is longer runtime and extra starting power for demanding appliances, the Westinghouse iGen2800 delivers more on paper with its 12-hour endurance and 2800 surge watts. If you prefer the peace of mind that comes with Generac's extensive service network and strong brand presence in the generator market, the GP2500i is a dependable choice that covers most portable power needs.
Both generators share the same running wattage, similar weight, and identical warranty coverage, so neither is a wrong answer. Your decision should come down to how you plan to use it most often. For overnight camping or extended outages where fuel efficiency matters, the iGen2800 has a clear practical advantage. For buyers who want a trusted name and easy access to support, the GP2500i holds its own.
Last updated March 18, 2026
| Specification | Generac #8251 GP2500i | Westinghouse iGen2800 |
|---|---|---|
| General | ||
| Product type | Generator | Generator |
| Fuel | Gasoline | Gasoline |
| Inverter | Yes | Yes |
| Parallel capable | Yes | Yes |
| RV ready | No | No |
| Running watts | Winner: Winner: 2200 W | Winner: Winner: 2200 W |
| Starting watts | 2500 W | Winner: Winner: 2800 W |
| Noise (lower limit) | 0 dB | Winner: Winner: 52 dB |
| Weight | 48 lbs | Winner: Winner: 46.3 lbs |
| Run time @50% load | Winner: Winner: 4.5 h | Not available |
| Run time @25% load | 8 h | 12 h |
| Fuel tank | 1 gal | 1 gal |
| Fuel gauge | No | Yes |
| Approx. dimensions (L × W × H) | 19.7 x 11.4 x 17.9 | 19.8 x 11.4 x 17.9 |
| Electrical | ||
| Voltage (AC) | 120 | 120 |
| Voltage (DC) | 12 | 5 |
| GFCI outlets | No | No |
| Covered outlets | Yes | Yes |
| Automatic Voltage Regulation | Yes | Yes |
| THD | Not available | <3% % |
| Engine | ||
| Engine | 98 cc OHV 4-stroke | Westinghouse OHV 4-stroke 98 cc |
| Alternator | Not available | Not available |
| Starting system | Recoil | Recoil |
| Warranty | ||
| Warranty | 3 years | 3 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 2200 W | 2200 W |
| Starting watts | 2500 W | 2800 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 | 4.5 h | Not available |
| Run time @25% load | 8 h | 12 h |
| Other | ||
| Data center | Not available | Not available |
| Indicators | true | true |
| Compliance | EPA, ANSI/PGMA G300-2023 | CARB, EPA |
| Security | Not available | Not available |
| Spark arrestor | Yes | Yes |
| Neutral | Not available | Floating |
| UPC | 696471003946 | 855464003896 |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 2200 | 2200 |
| Starting Watts (Gasoline) | 2500 | 2800 |
| Runtime @ 50% Load (Gasoline) | 4.5 | Not available |
| Runtime @ 25% Load (Gasoline) | 8 | 12 |
| AC Outlet Types | 1x Duplex 120V 20A (5-20R) | 1x Duplex 120V 20A (5-20R) |
| Electrical & power | ||
| Frequency | 60 | 60 |
| Engine & construction | ||
| Engine Type | 98 cc OHV 4-stroke | Westinghouse OHV 4-stroke |
| Engine Displacement | 98 | 98 |
| Engine Oil Type | 10W-30 | Not available |
| Runtime & fuel system | ||
| Runtime @ 25% Load (Gasoline) | 8 | 12 |
| Runtime @ 50% Load (Gasoline) | 4.5 | Not available |
| Safety & compliance | ||
| Overload Protection System | Low oil and overload protection | Low oil and overload protection |
| Low Oil Protection | Yes | Yes |
| Carbon Monoxide Monitoring | Yes | No |
| Included equipment | ||
| Starting Components | Recoil | Not available |
| Included Accessories | Oil, funnel, tool kit, and battery charging cables | Oil, funnel, and tool kit |
| Warranty & identification | ||
| Commercial Warranty | 3 | 3 |
| Part Number | 82512 | Not available |
| Additional specs | ||
| Summary | The Generac GP2500i is a 2200-watt inverter generator built for portable backup power and recreational use. At 48 pounds, it moves easily between campsites, job sites, and emergency situations. The inverter technology means laptops, phones, and sensitive tools run safely because the power output stays stable. This unit runs on gasoline and delivers 2500 starting watts, so it can handle the initial surge when motors kick on. | The Westinghouse iGen2800 is a portable inverter generator delivering 2,800 peak watts and 2,200 running watts, ideal for home backup and recreational use. It features a 98cc 4-stroke engine, operates as low as 52 dBA, and offers up to 12 hours of runtime at 25% load. |
- Most PowerfulGenerac #8251 GP2500i2200W running
- QuietestWestinghouse iGen280052 dB
- Longest RuntimeGenerac #8251 GP2500i4.5h at 50% load


