Best Dual Fuel Generators (2026)

A conventional open frame with a 4-gallon tank is the plainest way to buy dual fuel, and this Westinghouse keeps the drop on propane modest at 360 watts. Gas gives 3,600 running watts and propane 3,240, enough for a refrigerator, a sump pump and a furnace blower on a careful plan. A CO sensor is listed, and it arrives ready to use with oil, a funnel and a tool kit.

The design is not an inverter, so the engine runs at a fixed speed and the output is less clean than the iGen units. It suits tools, pumps and appliances but is less kind to sensitive electronics, so add a UPS for a computer. Against the Westinghouse 6500 it carries about 1,700 fewer running watts, which is the price of the lower tier.

Expect a loud engine and plan for a cord run. Keep the propane regulator seat clean, check the oil often, and run the unit monthly so the carburetor stays clear.

Four thousand running watts on both fuels is the standout number here, because most dual fuel machines lose a few hundred watts on propane and this one does not. The listing says only the surge falls, from 4,800 to 4,320. An inverter design gives clean power for phones, tablets and laptops, and the case is quieter than any open frame in this guide.

Compared with the Westinghouse 4650, it gives 400 more running watts, cleaner output and a quieter engine, at the price of a more complex inverter and a smaller tank. It is a sound pick for a household that cares about noise.

Inverters need the same oil and plug discipline as any engine but have more electronics. Keep it dry and covered, and run it monthly so the inverter board stays exercised along with the carburetor.

This is the size where a house starts to feel properly covered. Gas delivers 5,300 running watts and propane 4,800, enough for a refrigerator, a freezer, a furnace, a sump pump and lights together, with a transfer-switch-ready 30 amp outlet for a proper hookup. A 4.7-gallon tank gives a longer first run than the smaller units.

It is an open-frame, fixed-speed machine, so expect more noise and less refined power than the inverter models. The propane drop is 500 watts, a similar proportion to its smaller sibling. Against the WEN 4800, it adds about 1,300 running watts on gas but loses the inverter's quiet and clean output.

The kit includes a propane hose, a wheel kit, oil and a funnel, so assembly is light. In year three, the carburetor and the fuel selector valve are the parts that need attention, so run it on each fuel at least once a year and drain the carburetor before long storage.

Nine thousand five hundred running watts on gasoline and 8,500 on propane puts this machine in whole-house territory. A 457cc engine with a cast iron sleeve and an automatic oil-pressure approach suits long runs, and the listing includes remote electric start. Two GFCI household outlets, a transfer-switch-ready 30 amp outlet and an RV outlet cover the common connections.

The 1,000-watt drop on propane is larger than on the smaller units, so size on 8,500 if propane is your plan. Against the Westinghouse 6500 it nearly doubles the capacity, and with it the weight, the noise and the fuel burn.

It is an engine you plan for, with a dedicated pad, a cover and a fuel strategy. Check the oil often during a long run, and keep a spare spark plug, filter and propane hose in the garage.

A 500cc engine and a 13,000-watt peak lead this listing, and the CO alert with automatic shutdown is the feature that matters most in a machine built to sit near a house. The listing frames the dual fuel choice as gasoline for maximum power and propane for longer runtime, which matches how owners use it.

Compared with the Westinghouse 12500, it adds a larger engine and a stated CO shutdown, but the listing is thin on running watts per fuel, so confirm the nameplate before sizing loads. The open frame means noise and weather exposure follow the usual pattern.

Plan the pad, the cover and the transfer switch. Test the CO alert as the manual instructs, and run the machine on both fuels each season so the selector valve does not stick.

DuroMax is a brand built almost entirely on dual fuel open frames, and the XP13000EH is its flagship for whole-home work. The listing promises enough power to keep a house running through a storm, with electric start and an engine the maker designs itself.

That in-house engine is both a strength and a question. It means the maker controls the supply of parts, which helps, but the listing gives less detail on running watts than the Westinghouse 12500, so ask for the figures on both fuels before you buy.

Owners should expect a large machine that needs a pad and a plan. Change the oil early, check it often, and keep a stabilizer in the gas can that feeds it.