Compare Generators Side-by-Side

Generator

Generator

4550 W

230 lbs

19 h

120/240V 60 Hz

120V 60 Hz

457 cc OHV 4-stroke, cast iron sleeve

208 cc OHV 4-stroke, cast iron sleeve

Recoil, Electric

Recoil

5 years

3 years

11000 W

4550 W

19 h

8550 W

3300 W

3.5 h

CARB, EPA

EPA, ANSI/PGMA G300-2023

811640016722

840876136553

9000

3650

11000

4550

9

14

19

2x Duplex 120V 20A (5-20R) GFCI; 1x 120V 30A (L5-30R); 1x 120/240V 30A (L14-30R); 1x 120/240V 50A (14-50R)

1x Duplex 120V 20A (5-20R); 1x 120V 30A (L5-30R); 1x 120V 30A (TT-30R)

60

60

OHV 4-stroke, cast iron sleeve

208 cc OHV 4-stroke, cast iron sleeve

cast iron sleeve

cast iron sleeve

10W-30

19

3.5

Low oil and overload protection, CO monitoring

Low oil and overload protection

Wheel kit

Funnel, tool kit, propane hose, battery, and wheel kit

Oil, funnel, tool kit, propane hose, and wheel kit

3

The DuroStar DS11000DX is a 9,000-watt dual fuel generator built around a 457cc OHV engine with cast iron sleeves. This wattage places it squarely in the home backup and light job site category. On gasoline, it runs 9 hours at half load and 19 hours at quarter load. On propane, runtime drops to 3.5 hours at half load and 7 hours at quarter load, making gasoline the practical choice for extended outages. The dual fuel option gives users flexibility when propane is more accessible or economical, though gasoline delivers longer operating windows per tank. At 74 dB, the noise level sits in the moderate range for this power class, meaning it will be audible but not prohibitively loud in residential settings. The 8.3-gallon fuel tank combined with the quarter-load runtime means users can stretch a single fill to nearly a full day of light operation.

The Firman H03655 is a 3,650-watt dual-fuel generator built around a 208 cc OHV 4-stroke engine with a cast iron sleeve. Running on gasoline, it delivers 4,550 starting watts and 3,650 running watts. Switch to propane and output drops to 4,100 starting watts and 3,300 running watts. This power level runs a refrigerator, microwave, window air conditioner, or multiple power tools simultaneously. The dual-fuel flexibility means you can operate on whichever fuel is available, a practical advantage during extended outages or when propane storage is more convenient than gasoline. At 67 dB at quarter load, the H03655 operates quietly enough for residential neighborhoods without disturbing neighbors. The 5-gallon tank delivers 14 hours of runtime at 50 percent load on gasoline, translating to roughly one full day of moderate use before refueling. The RV-ready configuration and included wheel kit position this unit as a go-anywhere power source for camping, job sites, and home backup scenarios.