Firman P08008 vs Generac #7951 RS8000E

Comparison Overview

Key takeaways

• Both deliver 8000 running watts and 10000 starting watts on gasoline.
• Firman P08008 runs 12 hours at 50% load, longer between refuels.
• Generac #7951 RS8000E runs 10.5 hours at 50% load.
• Firman P08008 weighs 208 lb, slightly easier to roll than 213.8 lb.
• Both are non-inverter generators, better for tools and appliances than quiet camping.
• Both include a 3-year warranty for longer-term ownership confidence.

Best use cases

Choose the Firman P08008 if you want the closest thing to “same power, fewer refuels.” With 12 hours at 50% load, it is a strong fit for home backup where you are running a refrigerator, some lights, a router, and cycling a furnace fan or sump pump. That longer mid-load runtime is also helpful on a job site when the generator is powering tools intermittently and you do not want to stop to top off as often. At 208 lb, it is still heavy, but it is slightly easier to maneuver than the Generac if you are rolling it in and out of a garage.

Choose the Generac #7951 RS8000E if you are buying based on brand familiarity, parts availability, or you already own other Generac equipment and prefer to stay consistent. It matches the Firman on the numbers that matter most for capability, 8000 running watts and 10000 starting watts, so it can handle similar “big start” loads like a well pump or larger power tools. The tradeoff is a shorter stated runtime at the same 50% load, 10.5 hours, and a slightly higher weight at 213.8 lb, which can matter if you move it frequently.

For camping, RV use, or situations where quiet hours are enforced, neither is an ideal match because both are non-inverter designs and typically louder than inverter generators. For sensitive electronics, many people still use open-frame units successfully, but if you want the cleanest power and the quietest operation, an inverter generator is usually the better category to shop.

Verdict & recommendation

If your priority is getting maximum time between fill-ups at a typical household load, the Firman P08008 has the edge with 12 hours at 50% load versus 10.5 hours for the Generac #7951 RS8000E. If your priority is sticking with a brand you trust for service, parts, and familiarity, the Generac is an easy pick because it delivers the same 8000 running watts and 10000 starting watts.

Since both are gasoline, non-inverter, heavy-duty portables with 3-year warranties, think about how you will actually use it: longer runtime and slightly lighter weight point to Firman, while brand preference and support comfort can justify Generac. Either way, plan for safe outdoor operation, proper cords, and a realistic fueling routine during longer outages.