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A natural gas dual fuel generator lets you run on either propane or gasoline, and in many setups it can also be fed from a natural gas line. That flexibility matters most when a storm knocks out power for days and you need a generator that keeps running without constant refueling. It also matters for noise, because the fuel you choose affects how the engine sounds under load. The picks below are ranked by how well they fit a set of practical selection criteria: fuel flexibility, rated noise output, runtime per tank, power capacity and how easy the unit is to install and maintain. Nothing here comes from personal testing. The comparisons rely on manufacturer specifications, brand reputation and the patterns owners commonly describe in their reviews.
Our Top Picks
Quick Comparison
| Product | Best for | Key feature |
|---|---|---|
| Generac GP Series 8000E | Whole-home backup with a permanent transfer switch | Electric start and wide fuel flexibility |
| Champion 100263 Dual Fuel Portable Generator | Budget-minded buyers who want portable power | Switchable gasoline and propane operation |
| Generac GP15000E | Large homes and high-draw appliances | High running capacity with electric start |
| Westinghouse WGen7500DF | Users who want a large tank-style runtime | Dual-fuel operation with a large run time per tank |
| Champion 201cc Dual Fuel Inverter Generator | Quiet operation near campsites or neighbors | Inverter design for cleaner, quieter power |
Generac GP Series 8000E
This unit suits homeowners who want to connect a generator to a transfer switch and run essential circuits during an outage. Its fuel flexibility makes it a practical choice for households with an existing natural gas or propane supply.
Key specs
- Fuel options: gasoline, propane, and natural gas with a conversion kit
- Electric start with a battery-based starter
- Rated running output in the 6,500 to 8,000 watt range, depending on fuel
- Designed for permanent or semi-permanent installation
Pros
- Works well with transfer switches for whole-circuit backup
- Electric start reduces the effort of starting in bad weather
- Fuel flexibility covers several common home supplies
Cons
- Heavier than portable units and better suited to a fixed location
- Natural gas operation depends on a correctly sized supply and a qualified installer
Champion 100263 Dual Fuel Portable Generator
Buyers who need a portable unit for occasional outages or job sites often look at this type of model first. Owners frequently mention that switching between gasoline and propane is simple once the unit is set up.
Key specs
- Fuel options: gasoline and propane
- Portable frame with wheels and a handle
- Rated running output in the roughly 7,500 watt class
- Manual and electric start options vary by configuration
Pros
- Easy to move between locations
- Propane operation keeps fuel storage simpler for long periods
- Broadly available parts and service support
Cons
- Conventional open-frame design produces more noise than inverter models
- Natural gas operation is not its primary strength compared with propane
Generac GP15000E
This larger unit fits homes with central air, well pumps or other high-draw loads. It is a sensible choice when the goal is to power more of the house rather than a few outlets.
Key specs
- Fuel options: gasoline, propane, and natural gas conversion
- Electric start
- Rated running output in the 12,000 to 15,000 watt range, depending on fuel
- Requires a sturdy, well-ventilated mounting area
Pros
- High capacity for large or multiple appliances
- Electric start is convenient for a unit of this size
- Good fit for permanent transfer-switch installations
Cons
- Large and heavy, so placement and moving require planning
- Louder under heavy load than smaller inverter models
Westinghouse WGen7500DF
Users who want long runtimes between refueling often consider this type of larger-tank, dual-fuel model. It suits a homeowner who expects extended outages and wants fewer refueling trips.
Key specs
- Fuel options: gasoline and propane
- Rated running output in the roughly 7,500 watt class
- Larger fuel tank for extended runtime on gasoline
- Electric start on most configurations
Pros
- Long runtime per tank compared with many portable units
- Dual-fuel flexibility for changing supply conditions
- Reasonable power for essential household circuits
Cons
- Conventional engine design means more noise than inverter units
- Heavier than compact portables, which limits easy relocation
Champion 201cc Dual Fuel Inverter Generator
This is the option to consider when noise is a priority, such as camping, tailgating or running power near neighbors. Inverter designs adjust engine speed to load, which generally lowers noise at light loads compared with fixed-speed engines.
Key specs
- Fuel options: gasoline and propane
- Inverter output for cleaner power suitable for sensitive electronics
- Compact, lighter frame than conventional portables of similar class
- Engine displacement around 201cc
Pros
- Quieter operation at partial loads
- Clean power output suited to electronics
- Compact and easier to carry
Cons
- Lower maximum capacity than large standby-style units
- Not designed for whole-home backup without additional equipment
Buying Guide
Selection criteria
Start with how you plan to use the generator. Standby backup, job-site power and campground use all reward different features. For a natural gas dual fuel generator, the main questions are whether your home has a natural gas line, whether you can store propane safely, and how much load you need to run at once.
Important features
- Fuel flexibility: confirm whether the model runs on natural gas with a conversion kit, or only on gasoline and propane
- Electric start: useful for larger units and for cold or wet conditions
- Inverter versus conventional design: inverters are generally quieter at light loads and produce cleaner power
- Transfer switch compatibility: needed for connecting to household circuits safely
Specs to check
Compare rated running watts, not just peak watts. Add up the running wattage of the appliances you want to power, then choose a unit with headroom. Check the stated fuel consumption at 50 percent and 100 percent load, and look for the decibel rating the manufacturer lists, noting the distance at which it was measured. Manufacturers specify these figures under different test conditions, so compare them carefully.
Choosing by need
- Whole-home backup: a larger, electric-start unit with a transfer switch
- Occasional portable power: a compact dual-fuel or inverter model
- Quiet use near people: an inverter-style unit with a low rated decibel level
- Long outages: a unit with a larger tank or reliable propane supply
Things to watch out for
Never run any generator indoors, in a garage or near windows and vents, because exhaust contains carbon monoxide. Natural gas conversion kits and fixed installations should be handled by a licensed professional, and local codes may require permits. Consult a qualified electrician or gas technician before connecting any generator to a home supply.
FAQ
Can a natural gas dual fuel generator run on natural gas and propane?
Many dual-fuel models run on gasoline and propane, and some larger units can be converted to natural gas with a manufacturer-approved kit. Check the specific model’s documentation for supported fuels before buying.
Is a dual fuel generator quieter than a standard generator?
Not automatically. Noise depends mainly on engine design and load. Inverter dual-fuel units are generally quieter at light loads than conventional open-frame units, but a large unit under heavy load can be louder than a small one.
How long can a natural gas dual fuel generator run?
Runtime depends on the fuel source, tank size and load. Natural gas supplied from a utility line can allow long operation, while propane and gasoline runtime depends on tank capacity. Check the manufacturer’s stated run times at 50 percent load.
Do I need a transfer switch?
If you want to power household circuits, yes. A transfer switch isolates your home from the utility grid so power does not backfeed into lines, which is dangerous to utility workers. Have a licensed electrician install it.
Where should I place a dual fuel generator?
Place it outdoors, at least the distance the manufacturer specifies from doors and windows, and on level ground. Keep it away from people and pets. For more detail, see Where to Place a Generator for Less Noise and Safe Exhaust.
How do I reduce noise from my generator?
Placement, maintenance and vibration control all help. How to Make a Generator Quieter Safely covers practical steps, and Reducing Generator Vibration Noise: Pads, Mounts and Surfaces explains how mounts affect sound.
Is an inverter generator better for sensitive electronics?
Inverter generators typically produce cleaner power with lower total harmonic distortion than conventional units, which suits sensitive electronics. Still, verify the output specification against your device requirements.
How should I compare noise ratings?
Look at the decibel figure, the measurement distance and the load condition the manufacturer used. How to Compare Generator Noise Ratings Fairly walks through what to match up before comparing two models.
Conclusion
A natural gas dual fuel generator makes the most sense when you need flexible fuel options and reliable power. For whole-home backup, a larger electric-start unit paired with a transfer switch fits best, such as the Generac GP Series 8000E or GP15000E. For portable power on a tighter budget, the Champion 100263 or Westinghouse WGen7500DF offer dual-fuel flexibility. If quiet operation is the priority, the Champion 201cc inverter model is the most relevant of these picks. Match the unit to your actual load, your fuel supply and your noise tolerance, and have any gas or electrical connection installed by a qualified professional.
