When the power goes out—whether from a storm, wildfire, blackout, or grid failure—having a reliable source of backup energy is essential. For many homeowners shopping for a generator, one important question to consider is: What are dual fuel portable generators?
Dual fuel portable generators are versatile backup power units that can run on either gasoline or propane (LPG), giving you two fuel source options instead of one. This flexibility is incredibly useful during emergencies, when fuel availability may be limited or uncertain.
In this comprehensive guide, we’ll explain how dual fuel generators work, compare them to traditional single-fuel models, highlight their advantages and trade-offs, and recommend top-rated models for home emergency use.
What Is a Dual Fuel Portable Generator?
A dual fuel portable generator is a type of generator that can operate using two types of fuel—typically gasoline and propane. This flexibility allows you to switch between fuels depending on availability, cost, storage, and personal preference.
How it works:
- The engine is designed to accept both gasoline and propane.
- A fuel selection switch allows you to choose your desired fuel.
- The generator delivers the same electrical power output regardless of which fuel is in use (though runtime and efficiency may vary).
Some models also offer automatic or manual fuel switching, allowing you to change fuels mid-operation with minimal disruption.
Why Choose a Dual Fuel Generator?
Dual fuel generators are popular among homeowners and preppers because they offer greater reliability, convenience, and fuel flexibility. Here’s why many experts recommend them for emergency use:
🔥 1. Fuel Availability During Emergencies
Gasoline may be scarce during natural disasters (especially hurricanes or winter storms). Propane is often more readily available and can be stored safely for longer periods.
⛽ 2. Extended Runtime
Dual fuel capability allows you to alternate between fuels or combine usage to extend overall runtime. For example, when your gasoline runs out, you can switch to propane without downtime.
💰 3. Potential Fuel Cost Savings
Depending on local prices, propane may be more affordable or stable than gasoline—especially during crisis-driven price spikes.
♻️ 4. Cleaner Burning with Propane
Propane produces fewer emissions, burns cleaner, and is less likely to gum up your carburetor or fuel lines than gasoline.
💼 5. Greater Peace of Mind
Having two fuel options gives you more control and confidence during unpredictable events. It’s a smarter long-term investment for off-grid resilience.
Gasoline vs. Propane: What’s the Difference?
| Feature | Gasoline | Propane |
|---|---|---|
| Energy Output | Higher BTU output per gallon | Slightly lower power output |
| Runtime | Shorter (dependent on tank size) | Longer (with large external tanks) |
| Storage Life | 30–90 days (without stabilizer) | Indefinite (when sealed properly) |
| Emissions | More carbon and residue | Clean-burning, fewer emissions |
| Availability | Gas stations (may be closed during emergencies) | Widely available in propane tanks at hardware/grocery stores |
| Startup Ease in Cold | Better in sub-zero temps | Can be harder to ignite in extreme cold |
How Much Power Do Dual Fuel Generators Provide?
Dual fuel generators come in a variety of sizes—from small, quiet inverter models to heavy-duty 10,000-watt units. The power output is usually similar across both fuel types, but propane may slightly reduce peak wattage.
Power Ratings:
- Small (2,000–3,500W): Lights, Wi-Fi, laptops, phones, small fridge
- Mid-size (4,000–7,500W): Refrigerator, sump pump, microwave, fans, TV
- Large (8,000–12,000W): Whole-house backup with transfer switch
Tip: Always calculate your total wattage needs before purchasing. Learn more in our guide: What Size Generator Do I Need for My Home?
Best Dual Fuel Generators for Home Emergency Backup
🔥 Champion 100891 9375/7500-Watt Dual Fuel Generator
- 7,500 running watts (gas) / 6,750W (propane)
- Electric start + Intelligauge monitoring
- Runs up to 10 hours on gasoline, 5.5 hours on a 20-lb propane tank
🔋 DuroMax XP12000EH Dual Fuel Generator
- 12,000 starting watts / 9,500 running watts
- Ideal for whole-home backup with transfer switch
- Heavy-duty 457cc engine + long runtime
🔇 Westinghouse WGen9500DF
- 9,500 running watts / 12,500 peak (gasoline)
- Remote start + transfer switch ready
- EPA & CARB compliant for all 50 states
How to Use a Dual Fuel Generator Safely
Whether you’re using propane or gasoline, follow these safety guidelines:
- ✅ Always run outdoors—at least 20 feet from your home, windows, or vents
- ✅ Use a generator tent or weather cover to shield from rain and snow
- ✅ Turn off generator and allow to cool before refueling
- ✅ Install battery-operated CO detectors inside your home
- ✅ Store propane tanks upright, outdoors, and away from heat sources
💡 Pro Tip: Learn how to connect your generator safely using a manual transfer switch for whole-home backup without extension cords.
Pros and Cons of Dual Fuel Generators
✅ Advantages:
- Two fuel sources = better emergency preparedness
- Longer runtime with fuel switching
- Propane storage is safer and more stable
- Cleaner emissions when using propane
- Increased flexibility for rural/off-grid use
❌ Disadvantages:
- Higher cost than single-fuel generators
- Slightly lower output on propane
- More complex fuel system = more parts to maintain
- Propane may be harder to start in extreme cold
FAQs: Dual Fuel Portable Generators
Q: Can I switch between fuels while the generator is running?
Some models allow hot switching, but most require you to turn off the unit before switching. Always check your manual for safety instructions.
Q: Is propane or gasoline better for long outages?
Propane is better for long-term storage and cleaner operation. Gasoline is easier to find during short outages and starts better in the cold.
Q: Do I need special propane tanks or regulators?
Most dual fuel generators come with a propane hose and regulator. You’ll need a standard 20-lb or 30-lb tank (like for a grill or RV).
Q: Are dual fuel generators louder than gas-only models?
Noise levels depend more on engine size and generator design than fuel type. Inverter-style dual fuel models are typically quieter.
Q: Can I use natural gas in a dual fuel generator?
No—unless it’s specifically tri-fuel. Dual fuel units are designed for gasoline and propane only.
Conclusion: Dual Fuel Generators Offer Power and Peace of Mind
If you’re shopping for a portable generator for emergency home use, dual fuel models offer the best of both worlds: the accessibility of gasoline and the long-term reliability of propane. With proper setup, storage, and maintenance, a dual fuel generator can be a dependable power source for storms, blackouts, and off-grid living.
From flexibility and fuel security to runtime and cleaner emissions, dual fuel generators give you options—and in an emergency, options are everything.
Need Help Choosing the Right Generator?
Start here: What Size Generator Do I Need for My Home? — our complete guide to calculating your power needs and comparing top-rated portable and standby units.