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A dual fuel backup generator lets you run on gasoline or propane, which gives you a second fuel source when one is scarce, stale or unavailable during an outage. That flexibility matters most when a storm knocks out power for days and gas stations have no fuel or lines are long. This guide looks at seven models that suit different needs, and we ranked them by how well they match the selection criteria below: fuel flexibility, rated noise, running capacity, outlet and transfer options, and owner feedback patterns. None of the picks here were tested by us; the comparison draws on published specifications, manufacturer claims and the kinds of experiences owners commonly report.
Our Top Picks
Quick Comparison
| Product | Best for | Key feature |
|---|---|---|
| Generac GP8000E | Whole-home backup with a transfer switch | Electric start and high running wattage |
| Champion 100263 Dual Fuel Generator | Budget-conscious users who want two fuels | Gasoline and propane operation with electric start |
| Westinghouse WGen9500DF | Large homes and workshops | High surge capacity and remote start |
| DuroMax XP13000EH | Heavy loads and long outages | Dual fuel with a large tank and 240V output |
| Honda EU2200i (gasoline reference) | Quiet, light-duty backup for electronics | Inverter design with low rated noise |
| Champion 4375 Dual Fuel Portable Generator | Campers and light home use | Compact frame with dual-fuel capability |
| Generac GP3600 (gasoline reference) | Essentials during short outages | Simple operation and easy portability |
Generac GP8000E
This is a practical choice for homeowners who want to power a meaningful share of their household circuits through a transfer switch. Owners often describe it as a dependable workhorse when the goal is running a refrigerator, well pump, furnace blower and some lighting at once.
Key specs
- Rated running output in the mid-thousands of watts on gasoline
- Electric start
- Designed for dual-fuel operation with compatible conversion
- Outlets for standard 120V loads plus a 240V option
Pros
- Enough capacity for essential whole-home circuits
- Electric start reduces effort during an outage
- Widely available parts and service network
Cons
- Conventional design runs louder than inverter units
- Heavier and harder to move without a helper
Champion 100263 Dual Fuel Generator
Buyers who want the core dual-fuel capability without paying for extras often look at this type of Champion model. It suits a household that expects occasional multi-day outages and wants the option to switch fuels when gasoline runs short.
Key specs
- Gasoline and propane operation
- Electric start
- Conventional open-frame or enclosed design depending on configuration
- 120V household outlets
Pros
- Straightforward fuel switching
- Good value for the feature set
- Electric start simplifies cold-weather use
Cons
- Propane output is lower than gasoline output on most dual-fuel units
- Noise levels are typical of conventional generators, not inverters
Westinghouse WGen9500DF
This model targets buyers who need high surge capacity for motors, compressors or a well pump alongside lighting and refrigeration. It is often considered by people powering a larger house or a detached workshop.
Key specs
- High rated surge wattage with a lower continuous rating
- Dual-fuel capability on gasoline and propane
- Electric start and remote start on many configurations
- Multiple outlets including 240V
Pros
- Strong surge capacity for motor startups
- Remote start is convenient for exterior placement
- Multiple outlet types cover many setups
Cons
- Large footprint makes placement harder
- Noise output is high at full load without extra sound control
DuroMax XP13000EH
Owners running heavier loads for longer periods often look at this class of DuroMax model. It fits people who want a large fuel tank, 240V output and the ability to run on either gasoline or propane during extended outages.
Key specs
- Dual-fuel gasoline and propane operation
- Electric start
- 240V output for larger appliances
- Large fuel capacity for extended run times
Pros
- Large tank supports long run times
- 240V output powers well pumps and some HVAC equipment
- Good capacity relative to feature set
Cons
- Heavy and difficult to reposition
- Running at high load produces substantial noise and exhaust that needs safe placement
Honda EU2200i (gasoline reference)
This is a gasoline inverter generator, included as a reference point for buyers who want quiet, clean power for electronics and light loads rather than whole-house backup. It does not run on propane, so it is a reference for noise and power quality rather than a true dual-fuel pick.
Key specs
- Inverter design producing clean sine-wave output
- Gasoline fuel only
- Low rated noise compared with conventional units of similar class
- Suitable for sensitive electronics
Pros
- Quiet operation suits neighborhoods and campgrounds
- Clean power is safe for computers and phones
- Strong brand reputation for reliability
Cons
- Not dual fuel and limited running capacity for whole homes
- Small fuel tank means more frequent refueling
Champion 4375 Dual Fuel Portable Generator
Campers, tailgaters and people who need a few circuits during short outages may find this compact dual-fuel class useful. It is a lighter option when a full transfer-switch setup is not needed.
Key specs
- Gasoline and propane operation
- Portable frame with handles
- 120V outlets
- Moderate rated running wattage
Pros
- Lighter and easier to move than whole-home units
- Fuel flexibility for remote use
- Simple controls
Cons
- Limited capacity for larger appliances
- Conventional engine noise is noticeable at close range
Generac GP3600 (gasoline reference)
This is a light-duty gasoline portable unit included as a reference for buyers who only need essentials such as a refrigerator, a few lights and phone charging during short outages. It is not dual fuel, so it works best as a comparison for size and simplicity.
Key specs
- Gasoline fuel only
- Compact portable frame
- 120V outlets
- Modest rated running wattage
Pros
- Simple to start and operate
- Easy to store and transport
- Well-known parts and support network
Cons
- Not dual fuel and limited capacity
- Not suitable for whole-home backup
Buying Guide
Selection Criteria
When comparing a dual fuel backup generator, start with the loads you need to run, then check how the unit handles fuel, noise and connection to your home. Manufacturers publish rated running watts, surge watts, fuel type ratings and decibel figures. Owner feedback tends to highlight starting reliability, how the fuel switch behaves in cold weather, and how loud the unit feels at the distance where it is actually placed. For more on reading noise figures, see Generator Decibel Ratings Explained: What dBA Numbers Mean and How to Compare Generator Noise Ratings Fairly.
Important Features
- Dual-fuel capability: Confirm the manufacturer rates the unit for both gasoline and propane. Some models need a conversion kit or have different ratings on each fuel.
- Electric start: Useful in cold conditions and for users who may not want to pull a starter cord.
- Transfer readiness: A transfer switch or inlet box lets you power circuits safely without backfeeding the grid.
- Fuel tank size: Larger tanks extend run times between refills, which matters during prolonged outages.
- Noise design: Inverter units generally run quieter than conventional units, but they usually have lower capacity.
Specs to Check
- Rated running watts versus surge watts. Add up the running loads you need, then add the highest starting load for motors.
- Output types: 120V duplex outlets, 240V outlets, and any transfer-ready receptacle.
- Fuel consumption at 50% and 100% load, listed in the owner’s manual.
- Decibel rating and the distance at which it was measured. Figures measured at 23 feet are not directly comparable with figures at 7 meters.
- Propane output derate. Propane usually produces less power than gasoline, so check the propane rating separately.
Choosing by Need
Whole-home essentials with a transfer switch: Look at mid-to-large conventional dual-fuel models with 240V output and a large tank.
Light essentials and electronics: An inverter unit is often a better fit, even if it runs on gasoline only.
Camping or tailgating: A compact portable dual-fuel model is easier to move, and propane is convenient for storage.
Quiet neighborhoods: Prioritize low decibel ratings, and plan placement and enclosure carefully. See Where to Place a Generator for Less Noise and Safe Exhaust and Sound Barriers for Generators: Placement, Materials and Clearance.
Things to Watch Out For
- Carbon monoxide: never run a generator inside a home, garage, basement or enclosed space, and keep it well away from windows and doors.
- Backfeeding: connecting a generator to household wiring without a transfer switch can endanger utility workers and damage equipment.
- Propane supply: a large propane tank or cylinder must be sized and connected according to the manufacturer’s instructions.
- Local rules: some campgrounds and neighborhoods limit generator hours and noise. See Generator Noise Rules at Campgrounds, Parks and Neighborhoods.
- Maintenance: fuel stabilization and regular service keep dual-fuel units ready. See Generator Maintenance Basics: Oil, Air Filter, Spark Plug and Fuel.
For electrical connections, consult a licensed electrician before installing a transfer switch or inlet.
FAQ
What does dual fuel mean on a generator?
Dual fuel means the engine can run on either gasoline or propane. You select the fuel source, and the engine adjusts its carburetion or fuel system. Propane typically gives lower rated power than gasoline, so check the manufacturer’s propane rating before sizing the unit.
Is propane better than gasoline for backup power?
Propane stores well for long periods and does not go stale like gasoline, which makes it useful for standby situations. Gasoline usually delivers more rated power and may be easier to find in some areas. Many owners keep both options available.
Can a dual fuel generator run my whole house?
Only larger models with adequate running watts and a transfer switch can power a substantial share of household circuits. Add up the running and starting loads you need before choosing. A licensed electrician can help plan the connection.
How loud is a dual fuel backup generator?
Noise depends on design, load and distance. Conventional dual-fuel units often produce noticeably more sound than inverter models. Compare manufacturer decibel figures only when the measurement distance and conditions are the same.
Do I need a transfer switch?
A transfer switch is the safe way to connect a generator to household circuits. Plugging a generator into a wall outlet through a cord can cause backfeeding, which is dangerous. Have a qualified electrician install the switch.
How long can a dual fuel generator run?
Run time depends on tank size, fuel type and load. Manufacturers usually list run times at 50% load for gasoline and propane. Expect shorter run times at full load and check the owner’s manual for the specific figures.
Do dual fuel generators need special maintenance?
Maintenance follows the same basic schedule as other generators, including oil changes, air filter checks and spark plug inspection. Propane systems also need periodic inspection of hoses and fittings. Follow the manufacturer’s schedule and consult a qualified technician for repairs.
Conclusion
A dual fuel backup generator is most useful when you need fuel flexibility during extended outages. For whole-home essentials with a transfer switch, the Generac GP8000E and the DuroMax XP13000EH fit that role, with the DuroMax suited to heavier loads and longer runs. The Westinghouse WGen9500DF is worth considering for large homes and motor-heavy loads. The Champion 100263 and Champion 4375 offer dual-fuel operation in a more modest package, the 4375 being the easier one to move. If quiet, clean power for electronics matters more than dual fuel, the Honda EU2200i and Generac GP3600 are useful gasoline references. Match the rated watts, fuel type, noise figure and connection method to your actual loads, and have a licensed electrician handle any transfer equipment.
