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Choosing a dual fuel generator Generac model comes down to three things: how much power your home or job site actually needs, whether you want to run on gasoline, propane or both, and how much noise you can live with while the unit runs. Dual fuel designs let you switch between gasoline and propane (LP), which helps when fuel supply is uncertain or when you want longer storage life from one fuel source. In this guide we compare seven Generac dual fuel options using manufacturer specifications, brand reputation and common owner feedback patterns. We did not test these units ourselves, and every spec listed comes from published product information.
Our Top Picks
Quick Comparison
| Product | Best for | Key feature |
|---|---|---|
| Generac GP3500 Dual Fuel Portable Generator | Light backup and camping | Gasoline or propane operation in a compact frame |
| Generac GP6500 Dual Fuel Portable Generator | Whole-essentials backup for a small home | Higher running wattage with fuel switching |
| Generac GP8000E Dual Fuel Portable Generator | Medium home backup with electric start | Electric start and wheel kit availability |
| Generac GP10000E Dual Fuel Portable Generator | Larger homes and job sites | High output with electric start |
| Generac GP15000E Dual Fuel Portable Generator | Heavy loads and extended outages | Top output in the GP series with dual fuel use |
| Generac XG8000E Dual Fuel Portable Generator | Users wanting a heavier-duty frame | Dual fuel with a robust engine and electric start |
| Generac Dual Fuel Standby-Style Portable Model (XC series) | Owners who want a quieter, more stable output | Inverter-style output with dual fuel versatility |
Generac GP3500 Dual Fuel Portable Generator
This is the smallest unit in the group and fits people who need to keep a refrigerator, lights, phone chargers and a small fan running during a short outage. It also suits campers who want a lighter machine they can move without a cart.
Key specs
- Rated running output in the low-3,000-watt range on gasoline, with lower output on propane
- Manual start on most configurations
- Fuel switching between gasoline and propane via a selector
- Open-frame style construction typical of the GP line
Pros
- Lightweight relative to larger GP models
- Propane option extends fuel flexibility
- Simple controls with few parts to maintain
Cons
- Limited capacity for central AC or well pumps
- Manual start can be tiring in cold weather
Generac GP6500 Dual Fuel Portable Generator
The GP6500 is aimed at households that want to power a fridge, a furnace blower, lighting and a few circuits at once. Owners often describe it as the point where a portable unit starts to feel like a real whole-essentials backup source rather than a basic emergency setup.
Key specs
- Rated running output in the mid-5,000-watt range on gasoline
- Dual fuel capability (gasoline and propane)
- Electric start available on some configurations
- Multiple outlet types including 120V and 240V
Pros
- Enough capacity for many essential household circuits
- Dual fuel gives a backup if one supply runs short
- Widely available parts and service network
Cons
- Heavier and harder to move without a wheel kit
- Noise is noticeable at close range, so placement matters
Generac GP8000E Dual Fuel Portable Generator
This model suits owners who want electric start and a bit more headroom than the GP6500 provides. It fits well for a medium-sized home where a sump pump, a refrigerator and several lights need to run through a multi-hour outage.
Key specs
- Rated running output in the upper-7,000-watt range on gasoline
- Electric start on the “E” configuration
- Dual fuel operation (gasoline or LP)
- Wheel kit available as an add-on for easier positioning
Pros
- Electric start is convenient in cold or dark conditions
- Good capacity step up from GP6500 class models
- Propane operation helps with stored-fuel planning
Cons
- Needs a 12V battery for electric start, which must be kept charged
- Weight makes it awkward without a wheel kit
Generac GP10000E Dual Fuel Portable Generator
The GP10000E targets larger homes and light commercial use, such as job sites or workshops that need a steady power source for tools and lighting. It fits owners who are comfortable with a bigger, heavier unit that stays in one place.
Key specs
- Rated running output near 8,000 watts on gasoline, with higher peak figures listed by the manufacturer
- Electric start
- Dual fuel capability
- Multiple 120V and 240V outlets
Pros
- Handles larger loads than the smaller GP models
- Electric start with dual fuel flexibility
- Good fit for fixed-location backup
Cons
- Heavy enough that moving it requires two people or a cart
- Fuel consumption rises noticeably at higher loads
Generac GP15000E Dual Fuel Portable Generator
This is the top of the GP line in this comparison and suits users who need to run heavy loads, such as multiple appliances plus a well pump, during extended outages. It is a serious piece of equipment, so it makes most sense for owners with a permanent setup area.
Key specs
- Rated running output in the 12,000-watt range or higher depending on configuration
- Electric start
- Dual fuel gasoline and LP operation
- Heavy-duty frame with wheel kit compatibility
Pros
- Highest capacity in this group
- Dual fuel versatility over long outages
- Robust construction typical of the GP series
Cons
- Heavy and loud at full load, so placement and sound control matter
- Overkill for light backup needs
Generac XG8000E Dual Fuel Portable Generator
The XG8000E is a heavier-duty option for owners who want a more rugged frame and electric start in a mid-size output range. It fits people who expect frequent use, such as seasonal cabins or job sites, and want a build designed for repeated operation.
Key specs
- Rated output in the upper-7,000-watt range
- Electric start
- Dual fuel operation
- Heavier-duty frame compared with standard GP units
Pros
- Sturdy build for frequent use
- Electric start and dual fuel in one package
- Good mid-range output for many homes
Cons
- Weight limits portability
- Owners should confirm specific output figures against the current spec sheet before buying
Generac Dual Fuel Standby-Style Portable Model (XC series)
This option is for owners who want more stable power for sensitive electronics and a quieter running profile than a conventional open-frame unit. It suits home offices, medical devices with power needs (confirm requirements with your provider) and camping setups where noise rules apply.
Key specs
- Inverter-style output for cleaner power
- Dual fuel gasoline and propane operation on applicable models
- Lower running noise than conventional open-frame designs, per manufacturer specs
- Smaller footprint than the GP15000E class
Pros
- Cleaner output suitable for electronics
- Quieter operation than many conventional units
- Dual fuel flexibility retained
Cons
- Lower maximum output than the GP heavy-duty units
- Pricing and availability vary by configuration, so check current listings
Buying Guide
Selection Criteria We Used
We compared these models on published running wattage, dual fuel capability, start type, portability, and the noise profile manufacturers state for each unit. We also looked at brand service coverage and recurring owner feedback themes, such as whether units run reliably on propane in cold weather or how easily they are moved.
Important Features in a Dual Fuel Generac Generator
- Fuel switching: Check whether the unit switches fuels with a selector while running or only when shut down. Confirm the procedure in the owner’s manual.
- Running vs. starting watts: Starting watts are higher than running watts. Motor-driven loads like well pumps can need a significant surge.
- Start type: Electric start is easier in cold weather but depends on a healthy battery. Recoil start needs no battery.
- Outlets: Confirm 120V and 240V outlets match your transfer switch or appliance requirements.
Specs to Check Before You Buy
- Rated running watts on both gasoline and propane, since output typically drops on LP
- Fuel tank size and runtime at half load
- Noise rating in dBA at a stated distance (manufacturers specify this differently, so compare like with like)
- Weight and whether a wheel kit is available
Choosing by Need
- Light backup or camping: the GP3500 class
- Whole-essentials for a small home: the GP6500 or GP8000E
- Larger homes or heavy loads: the GP10000E or GP15000E
- Frequent use and rugged build: the XG8000E
- Electronics and quieter running: the XC-series inverter-style model
Things to Watch Out For
- Never run any generator indoors, in a garage or near open windows. Carbon monoxide can build up quickly.
- Propane output is usually lower than gasoline output, so size the unit on LP ratings if you plan to rely on it.
- Check local rules on generator noise hours before running one at a campsite or in a residential area.
For placement and noise reduction, see Where to Place a Generator for Less Noise and Safe Exhaust and Generator Decibel Ratings Explained: What dBA Numbers Mean. Maintenance habits that affect noise and reliability are covered in Generator Maintenance Basics: Oil, Air Filter, Spark Plug and Fuel.
FAQ
Can a dual fuel generator Generac unit run on both gasoline and propane?
Yes, the dual fuel models in this list are designed to run on either gasoline or propane (LP). Switch fuels according to the owner’s manual, and expect lower rated output on propane.
Is propane better than gasoline for a dual fuel generator?
Propane stores for longer than gasoline and burns cleaner, which is useful for standby planning. Gasoline usually delivers higher rated output. Many owners keep a supply of both.
Do dual fuel Generac generators start in cold weather?
Electric-start models depend on a charged battery, so keep it maintained. Cold weather reduces battery capacity and can affect propane vaporization, so consult the manual for cold-start guidance.
How loud is a dual fuel generator?
Noise depends on model, load and distance. Open-frame units are generally louder than inverter-style designs. Compare manufacturer dBA ratings at the same test distance. Consult a professional if you plan to install a unit permanently near living space.
Can I power my whole house with one of these units?
Most portable models here are better suited to essential circuits. Whole-house backup usually requires a standby system or a properly installed transfer switch, which a licensed electrician should size and install.
Do I need a transfer switch?
Yes, if you connect a generator to your home wiring. Never backfeed a household circuit through a standard outlet. A licensed electrician can install a transfer switch to protect utility workers and your equipment.
How often should I service a dual fuel generator?
Follow the manufacturer’s maintenance schedule for oil changes, air filter checks and spark plug inspection. Regular service supports reliable starts and steady output on both fuels.
Conclusion
For light backup and camping, the GP3500 class is the simplest entry point. Homeowners who want to run essential appliances should look at the GP6500 or GP8000E, with the electric-start GP8000E offering more convenience. Larger homes and heavy loads point toward the GP10000E or GP15000E. The XG8000E suits frequent use, while the XC-series inverter-style model is the best fit for electronics and quieter operation. Match your pick to your wattage needs on propane as well as gasoline, and confirm current specifications before purchase, since configurations change.
