When the power goes out, a generator that runs on both gasoline and propane gives you unmatched flexibility. You can tap into your propane tank for clean, long-lasting fuel or use gasoline for maximum wattage when you need it most. Whether you’re preparing for hurricane season, living off-grid, or just want peace of mind during winter storms, a dual fuel generator is a smart investment. In this guide, we’ve reviewed seven top models from Westinghouse, DuroMax, and DuroStar to help you find the perfect match for your home backup needs.
If you’re new to dual fuel generators, you might want to check out our best dual fuel generator picks for reliable home backup for a broader overview before diving into specific models.
Buying Guide
Power Output: Peak vs. Running Watts
Your generator’s wattage determines what you can run. Peak watts handle startup surges from motors (like your fridge or AC), while running watts keep things going. For whole-home backup, look for at least 10,000 peak watts. The Westinghouse 14500 Peak Watt Dual Fuel Home Backup and DuroMax XP13000HX both deliver ample power for essentials plus some extra capacity for lights and electronics.
If your needs are lighter, a mid-range model like the Westinghouse 5000 Peak Watt Super Quiet Dual Fuel can handle a fridge, sump pump, and a few outlets without breaking the bank.
Fuel Type and Runtime
Propane burns cleaner and stores indefinitely, making it ideal for emergencies. Gasoline offers higher peak wattage and is easier to refuel during extended outages. Most dual fuel generators switch between fuels with a simple selector valve. For long runtimes, consider models with larger fuel tanks. The Westinghouse 13500 Peak Watt Dual Fuel Home Backup runs up to 19 hours on a 9.5-gallon gas tank at 25% load, meaning you can sleep through the night without refueling.
Inverter vs. Traditional Generator
Inverter generators use advanced electronics to produce clean power (under 3% THD) that’s safe for sensitive devices like laptops and TVs. They’re also quieter and more fuel-efficient because the engine speed adjusts to the load. The Westinghouse 12000 Peak Watt Dual Fuel Inverter Generator is a standout here, with a remote start and parallel capability for doubling output. Traditional generators are simpler and often cheaper, but they may not be ideal for electronics without an external voltage regulator.
For more on inverter technology, see our inverter generator guide.
Transfer Switch Readiness and Outlets
A transfer switch lets you connect your generator directly to your home’s electrical panel, so you can power hardwired appliances like your furnace or well pump. Many models, like the DuroMax XP13000EH and Westinghouse units, come with a 50-amp outlet ready for a transfer switch or interlock kit. Check the outlet configuration: you’ll want at least one 120/240V 50A outlet for whole-home connection, plus standard 120V household outlets for portable use.
For a deeper dive into transfer switch options, read our generac 24kW generator review for insights on whole-home integration.
Final Thoughts
Choosing the best dual fuel generator gas and propane comes down to your power needs, budget, and how you plan to use it. For whole-home backup with inverter technology and quiet operation, the Westinghouse 12000 Peak Watt Dual Fuel is our top pick, offering exceptional fuel efficiency and clean power for sensitive electronics. If you want maximum value and raw power without sacrificing reliability, the DuroMax XP13000HX 13,000-Watt Dual Fuel delivers 13,000 peak watts, a rugged all-metal frame, and a transfer switch-ready 50-amp outlet at a competitive price. Whichever you choose, you’re getting a dependable backup solution that keeps your family safe and comfortable during outages.
Frequently Asked Questions
Can I run a dual fuel generator on propane only?
Yes, all the generators in this review are designed to run on either gasoline or propane. Propane is ideal for emergencies because it doesn’t go bad over time, and it burns cleaner, reducing maintenance. Just make sure you have the proper propane regulator kit, which is included with most models like the Westinghouse units.
How long will a dual fuel generator last on a full tank of gas?
Runtime varies by model and load. For example, the Westinghouse 13500 Peak Watt Dual Fuel Home Backup can run up to 19 hours at 25% load on its 9.5-gallon tank. At higher loads, runtime decreases. Inverter generators like the Westinghouse 12000 Peak Watt Dual Fuel Inverter are more fuel-efficient because they adjust engine speed to match demand, saving up to 50% on fuel compared to traditional generators.
Do I need a transfer switch to connect a portable generator to my home?
For safety and code compliance, yes. A transfer switch or interlock kit prevents backfeeding, which can electrocute utility workers and damage your equipment. Many of the generators here, including the DuroMax XP13000EH and Westinghouse models, are transfer switch ready with a 50-amp outlet. For automatic operation, consider the Westinghouse WATS200 system (sold separately).
What is the warranty on these dual fuel generators?
Westinghouse generators come with a 3-year limited residential warranty and lifetime technical support. DuroMax and DuroStar offer similar coverage, typically 3 years on parts and labor. Always register your generator after purchase to activate the warranty. For more details, check the product page or contact the manufacturer directly.
