Dual fuel vs. single fuel generator: What’s the difference?

In this article, we’ll provide an in-depth comparison of single fuel and dual fuel generators to help you make an informed decision.

January 6, 2026
BY BISON

Suddenly, the lights go out during a storm, your campsite is in total darkness, or a worksite grinds to a halt because there’s no electricity. In moments like these, having a reliable source of power isn’t just convenient—it’s essential. More and more people are realizing the importance of dependable backup power for home, work, or outdoor adventures.

Portable generators have emerged to meet this need. Among the many options on the market, two types stand out: single fuel generators, which run on one type of fuel, and dual fuel generators, which can operate on two different fuels for added flexibility. Each has its advantages, depending on your priorities, budget, and circumstances.

As a professional generator manufacturer, BISON understands the critical role these machines play. In this article, we’ll provide an in-depth comparison of single fuel and dual fuel generators to help you make an informed decision.

Single fuel generators

A single fuel generator is designed to run on only one type of fuel. These generators are straightforward, lighter, and easier to operate, making them a popular choice for home backup, outdoor activities, and job sites. By focusing on a single fuel type, they achieve better efficiency, smoother combustion, and reliable performance. Whether powered by gasoline, diesel, propane, or natural gas, single fuel generators provide a dedicated power solution optimized for specific applications.

Advantages

Simplicity: easy to operate and maintain, with fewer components than dual fuel models.
Reliable performance: provides consistent power output for its specific fuel type.
Affordability: lower initial purchase cost compared to dual fuel generators, making them ideal for short-term or occasional use.
Straightforward operation: no need to manage fuel switching or complex setup, making them convenient for users who prefer simplicity.

Disadvantages

Limited fuel flexibility: runs on only one fuel type, which can be a drawback if supply is limited or unavailable.
Fuel storage challenges: large quantities of gasoline or diesel fuel can be dangerous, while natural gas requires a dedicated safety system for its supply.
No advanced features: lacks the versatility and extended runtime of dual fuel systems. Users needing flexible fuel options may find single fuel models limiting.

Dual fuel generators

A dual fuel generator is a versatile portable generator capable of running on two fuel types, most commonly gasoline and propane (LPG). This flexibility allows users to choose the fuel that is most convenient, cost-effective, or readily available at any given time.

Dual fuel generators are ideal for running essential appliances, lighting, and heating or cooling systems during power outages or in off-grid locations. They feature a simple switching mechanism—often a knob or fuel line adjustment—that lets you switch between gasoline and propane without interrupting the power supply.

Advantages

Longer runtime: alternating fuels allows extended operation without immediate refueling.
Potential cost savings: choose the more affordable fuel when available, reducing operating costs.
Increased fuel efficiency: many dual fuel generators use diesel or gasoline for ignition and natural gas or propane for operation, improving energy output and runtime compared to single fuel generators.
Environmentally friendly: efficient engines combined with cleaner fuels result in fewer pollutants than single fuel gasoline or diesel generators.

Disadvantages

Higher cost: generally more expensive upfront than single fuel models.
More complex maintenance: dual fuel systems require extra care and occasional servicing. Monitoring both fuel systems can involve cleaning, inspecting engines, and checking fuel lines.
Fuel storage challenges: gasoline has a limited shelf life and requires stabilizers for long-term storage.

Major differences between dual and single fuel generators

As an experienced generator manufacturer, BISON knows that choosing the right generator depends on understanding the key differences between single fuel and dual fuel models. Here’s a clear comparison:

1. Fuel flexibility

Single fuel: runs on only one fuel type—gasoline, diesel, propane, or natural gas. Simple and reliable, but limits options if your preferred fuel is unavailable.

Dual fuel: can operate on two fuels, typically gasoline and propane. Allows switching depending on availability or cost.

2. Power output and performance

Single fuel: delivers consistent power for its fuel type. Gasoline and diesel models generally offer higher peak performance than propane-based models.

Dual fuel: power may be slightly lower on propane than gasoline but is sufficient for most home, worksite, or outdoor needs.

3. Efficiency and runtime

Single fuel: efficiency depends on the fuel; diesel provides longer runtime, gasoline is convenient for short-term use, and propane burns cleaner with slightly less energy density.

Dual fuel: extended runtime by switching fuels if one runs out. Ideal for emergencies or long workdays and can prolong generator life.

4. Price and maintenance

Single fuel: usually less expensive and simpler to maintain. Fewer components make servicing straightforward. Operational costs depend on fuel prices.

Dual fuel: higher upfront cost and more complex maintenance due to the dual system, but fuel flexibility can lead to long-term savings. Switching fuels allows the use of the more cost-effective or cleaner-burning option.

5. Portability and weight

Single fuel: lighter and more compact, making transport easier for camping or small job sites.

Dual fuel: typically heavier due to extra fuel components, but still manageable for most users.

6. Environmental impact and emissions

Single fuel: emissions vary by fuel type. Gasoline and diesel produce more pollutants, while propane and natural gas burn cleaner.

Dual fuel: can reduce environmental impact by using cleaner-burning fuels like propane, helping meet emission standards while providing reliable power.

Choosing the best generator for your needs

Key considerations

Total wattage: list all devices you need to power and add up their wattage. Single fuel generators may suffice for lower power requirements, while dual fuel models are better for higher or fluctuating demands.
Budget: single fuel generators are generally more affordable upfront, ideal for occasional use or cost-conscious buyers. Dual fuel generators cost more initially but provide long-term versatility and fuel options.
Intended use: for occasional home backup, a simple single fuel generator may be sufficient. For outdoor adventures or jobsites with varying fuel availability, dual fuel models offer flexibility and extended runtime.
Fuel access: if only one fuel type is easily available, single fuel generators are convenient. Dual fuel models ensure you’re never left powerless when fuel options vary.
Portability: single fuel generators are lighter and easier to transport, perfect for camping or small projects. Dual fuel generators are heavier but still manageable, especially when fuel flexibility is important.

Recommendations by user type

Homeowners: Single fuel gasoline or propane generators are ideal for home backup power, offering advantages such as simple design, affordability, and reliable performance during power outages. For areas with frequent outages, dual fuel generators offer extended runtime and the ability to switch fuels to keep essential appliances running longer.
Outdoor enthusiasts & campers: Dual fuel generators allow the use of propane for both power and appliances, reducing the need for multiple fuel types while keeping gasoline as an alternative for remote locations.
Job site operators: Dual fuel generators provide versatility and continuous operation. Diesel single fuel generators may suit larger projects requiring consistent heavy-duty power.
Emergency preppers: Fuel flexibility is critical. Dual fuel generators let you switch between gasoline and propane to ensure reliable backup during extended outages.

Summary

Choosing the right generator comes down to your power needs, fuel availability, and how you plan to use it. Single fuel generators are simple, reliable, and cost-effective, making them ideal for occasional use, budget-conscious buyers, or users who prefer a specific fuel type. Dual fuel generators offer flexibility, longer runtime, and peace of mind, making them perfect for emergencies, frequent outdoor use, or situations where fuel availability may vary.

As a professional Chinese generator manufacturer, BISON offers a wide range of generators, including both single fuel and dual fuel generators, with various options and configurations to choose from for you and your customers.

Invest in BISON today and import cost-effective generators from China – get a power supply that is easier to maintain, simpler to operate, and has a longer lifespan.

FAQs

What is the runtime of a dual fuel generator?

A standard dual-fuel generator can run for 6–12 hours on propane. Runtime depends on factors such as wattage demand and the amount of fuel available.

Can you convert a generator to dual fuel?

Yes. A dual-fuel conversion kit allows you to run low-pressure propane, natural gas, or gasoline. Note that this kit does not support high-pressure propane from tanks like barbecue cylinders.