Generac GP6500 COsense review
Generac GP6500 6,500-Watt Gasoline Portable Generator, with COsense
By Tom Calder
At 6,500 running watts it can run a refrigerator, furnace blower, sump pump and lights together, with a window air conditioner as the biggest add. Generac lists it as HomeLink manual transfer switch compatible, and COsense is the maker's term for its carbon monoxide shutoff.
- Best for
- A simple, no-fuss gasoline backup for a typical home
- Skip it if
- You live in California (this is the 49-state model) or want electric start
as of Nov 14, 2026, 5:36 PM ET · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.We earn a commission if you buy through the retailer links on this page. It doesn't change our verdict. How we make money →
Researched, not used. We haven't used this product. This review is built from the maker's specifications, owner reports and our own sizing.
What we like
- COsense carbon monoxide shutoff
- Transfer-switch compatible per Generac
- Steel tube cradle and wheel kit
Worth knowing
- Recoil start only
- Gasoline only, no propane option
- Heavy at 172 lb, and this is the 49-state version
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Who shouldn't buy this
Don't buy it if you live in California (this is the 49-state model) or want electric start.
Key specs
| Running watts | 6,500 W |
| Starting watts | 8,125 W |
| Fuel | Gasoline |
| Weight | 172 lb |
| CO safety (maker's term) | COsense |
| Noise (as listed) | — |
This is a Researched review: we haven't used this product. We check every specification against at least two independent sources, re-check the US price on a schedule where we can track it automatically, and say plainly who it isn't for. Commissions never change a rating.
If this isn’t the one
Best for Big home backup with remote start
as of Nov 14, 2026, 5:36 PM ET · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.
Best for The benchmark quiet inverter generator
as of Nov 14, 2026, 5:36 PM ET · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.
Best for Runs on propane too