Best Dual Fuel Generator in 2027

The iGen12000DFc leads our ranking for a dual fuel buyer. It gives 9,000 running watts and 12,000 peak watts on gasoline. The listing says propane output is 8,100 running watts. That is enough to cover a furnace fan, a fridge and lights during an outage, with room left for a few tools.

Noise is listed at 64 dBA, and the maker points to Eco Mode, insulation and mufflers. That is louder than the 52 dBA iGen5000DFc, so expect a clear hum next to a campsite. Runtime is 19 hours at 25% load on a 7.9 gal tank. That ties for the longest runtime on the page.

Clean power matters for electronics, and THD is listed at ≤3%. It has a 240V outlet, a TT-30R RV outlet, a CO shutoff sensor and a remote start. The listing also says it is parallel ready. At 189 lb, it is heavy to move, so plan on a flat spot near your transfer switch.

The WGen11500DFc ranks second on our list. It lists 11,500 running watts and 14,500 peak watts on gasoline, which is more running power than the iGen12000DFc. That headroom helps if your essentials include a well pump, central air or several large appliances at once. The listing also names an automatic transfer switch that is sold separately.

Runtime is 19 hours at 25% load on a 9.5 gal tank, which matches the longest runtime listed on the page. The tradeoff is noise. It is listed at 74 dBA, tied for the loudest rating on the page and well above the 64 dBA of the iGen12000DFc. The listing also mentions automatic low-oil shutdown.

THD is listed at ≤5%, so it is cleaner than the WGen9500DFc but not as clean as the iGen12000DFc. It has a 240V outlet, a CO sensor and remote start. It has no TT-30R RV outlet. At 230 lb, plan to leave it in one spot. Warranty is 3 yr.

The WGen9500DFc ranks third. It lists 9,500 running watts and 12,500 peak watts on gasoline, and 8,500 running watts on propane. That is enough for a typical whole-house essentials plan with a transfer switch, and the 120/240V 50A outlet fits an RV. The 30A L14-30R outlet is transfer switch ready.

Runtime is 12 hours at 25% load on a 6.6 gal tank. That is shorter than the 19 hours listed for the iGen12000DFc and WGen11500DFc, so expect more refills on long outages. The listing mentions a fuel gauge. Noise is listed at 74 dBA, tied for the loudest rating on the page.

Power quality is the weak spot. THD is listed at ≤23%, which is far higher than the ≤3% on the iGen12000DFc. That matters for laptops and TVs. Use a surge-protected setup for those. It has remote start, a CO shutdown and a 3 yr warranty. At 212.1 lb, it is also heavy to move.

The XP13000HX ranks fourth. It lists 10,500 running watts and 13,000 peak watts on gasoline, which is more running power than the iGen12000DFc and the WGen9500DFc. It runs on gasoline or propane, and the front panel lets you change fuel type in seconds. That suits a long outage. It also has electric push button start.

Runtime is 17 hours at 25% load on an 8.3 gal tank. That is close to the leaders at 19 hours. Our data lists no noise level or warranty length for it, so you cannot judge how loud it is. Check both before you buy.

Power quality is listed at <5% THD, which is acceptable for most electronics. It has a 240V outlet, a CO alert, and a 50A outlet that is transfer switch ready. The listing also notes all copper windings and a 500cc engine. At 240 lb, it is heavier than the other four top-ranked models.

The iGen5000DFc ranks fifth, and it is a different kind of dual fuel generator. It lists 3,900 running watts and 5,000 peak watts on gasoline, and 3,500 running watts on propane. That suits an RV, a campsite or a few essentials at home, not a whole house.

Noise is the standout. At 52 dBA, it is the quietest among the models that list it. The maker credits a double-insulated cover, a muffler and a variable speed engine. Runtime is 18 hours at 25% load on a 3.4 gal tank, close to the 19 hour leaders. It lists a 3 yr warranty.

At 105.8 lb, it is easier to move than the larger units above it. THD is listed at <3%, which is good for phones and laptops. It has a TT-30R RV outlet but no 240V outlet, though the listing mentions a parallel kit that adds one. It is also parallel ready. Remote start and a CO sensor are included.