Best Dual-Fuel Portable Generators
Gasoline stales in months; propane keeps indefinitely and stays available when a regional outage takes gas pumps down with it. Dual-fuel units let you store propane for emergencies and burn gasoline when convenience matters. Expect roughly 10% less output on propane than the gasoline rating — size against the propane figure if propane is your storm plan.
Sizing target: a portable or inverter unit that runs on both gasoline and propane. Filtered to portable and inverter units fueled by both gasoline and propane, ordered by gasoline running watts. Rankings use published specifications only — no prices or sponsorships.
| Model | Running W (best fuel) | Starting W | Noise | Est. runtime @ 25% | Est. fuel cost/day |
|---|---|---|---|---|---|
| Westinghouse WGen14500DF | 14,500 | 18,000 | 74 dBA | — | — |
| DuroMax XP15000HX Dual Fuel | 12,000 | 15,000 | 78 dBA | 19.2 h | $84 (gasoline) |
| Westinghouse WGen12000DF | 12,000 | 15,000 | — | — | — |
| Westinghouse WGen11500TFc Tri-Fuel | 11,500 | 14,500 | 74 dBA | — | — |
| DuroMax XP13000EH Dual Fuel | 10,500 | 13,000 | 74 dBA | 12.8 h | $80 (gasoline) |
| DuroMax XP13000HX Dual Fuel with CO Alert | 10,500 | 13,000 | 74 dBA | 13.6 h | $75 (gasoline) |
| Predator 13000 Tri-Fuel (71386) | 10,000 | 13,000 | 78.5 dBA | 19.4 h | $68 (gasoline) |
| DuroMax XP12000EH Dual Fuel | 9,500 | 12,000 | — | 12.8 h | $80 (gasoline) |
| Pulsar G12KBN Dual Fuel 12000W | 9,500 | 12,000 | — | 20.8 h | $47 (gasoline) |
| Westinghouse WGen9500DF | 9,500 | 12,500 | 74 dBA | — | — |
Runtime at 25% load and daily fuel cost are estimates derived from published spec-sheet figures — the formulas and their limits are on the methodology page. A dash means the manufacturer doesn't publish the underlying number.
Not sure this is your use case? Add up your actual loads with the generator sizing calculator, or start from the sizing guide.
Frequently asked questions
What does this list require of a generator?
Every model shown meets the sizing target: a portable or inverter unit that runs on both gasoline and propane. Filtered to portable and inverter units fueled by both gasoline and propane, ordered by gasoline running watts.
How are these recommendations ranked?
Purely from published manufacturer specifications in the BackupAtlas dataset — no prices, sponsorships, or review scores are involved. Models missing the data a criterion needs are excluded rather than guessed at.
Are the wattage figures guaranteed?
They are the manufacturers' published ratings, and dual-fuel/natural-gas ratings differ by fuel — always size against the rating for the fuel you will actually run, and treat runtime and cost estimates as planning figures, not promises.