When the lights go out, a generator kicks in to keep your home running smoothly. But what does a Generac generator run on? It’s a great question—and one every homeowner should ask before making a purchase or planning an installation. The answer depends on the type of Generac generator you own or are considering.
Generac generators are designed to run on three primary fuel sources: natural gas, liquid propane, and diesel. Each has its benefits depending on your location, fuel availability, and how often you expect to use your generator.
Let’s take a closer look at how each of these fuel types works with Generac models—and why it matters when choosing the right generator for your home or business.
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Top Types of Fuel for Generac Generators
Generac designs its generators to be flexible when it comes to fuel. Whether you’re in the city with access to natural gas lines or in a rural area relying on a propane tank, there’s a model that fits your needs.
Diesel
Generac’s diesel-powered generators are typically used for larger-scale applications. These models are known for their powerful output and long-lasting performance. Diesel fuel is more energy-dense than other options, which means the generator can run longer without refueling.
It’s also more stable during long-term storage, which is why many commercial properties and critical infrastructure sites rely on diesel systems. If you need heavy-duty backup power for extended outages, diesel is a strong contender.
Liquid Propane
For homeowners without access to natural gas lines, propane is a popular and dependable fuel option. Many Generac models are designed to run efficiently on liquid propane, which connects to storage tanks located above or below ground.
Propane burns cleanly, doesn’t degrade over time, and offers reliable performance during extended outages, making it ideal for remote or rural properties. If you’ve ever wondered whether a Generac generator can run on propane, the answer is yes—it’s one of the cleanest and most convenient fuel sources available.
Natural Gas
If your home is already connected to a municipal gas line, natural gas is the most convenient fuel choice for your Generac generator. These models are ideal for homeowners who want a fully automatic, low-maintenance solution.
Since the generator draws directly from the gas line, there’s no need to store fuel or schedule refills. Plus, natural gas burns clean and allows the generator to run for as long as necessary during an outage, whether it’s a few hours or several days.
Can a Generac Generator Be Converted?
Thinking about switching your Generac generator from propane to natural gas—or vice versa? Some models can be converted, especially dual-fuel standby units, which are designed to run on either natural gas or liquid propane.
A licensed technician can typically adjust your current setup with minimal effort. However, diesel-powered generators are less flexible; converting them requires significant mechanical changes and is usually not the most affordable choice. If you’re unsure about your unit’s compatibility, check the owner’s manual or contact our team—we’ll help you determine the best fuel setup for your home.
Advantages of a Generac Generator
When it comes to whole-home backup power, Generac generators stand out for their performance, convenience, and user-friendly features. Whether you live in a hurricane-prone area or just want peace of mind during outages, here are some of the key benefits you can expect:
- Automatic transfer switch: Detects power outages and starts the generator instantly—no manual startup required.
- Flexible fuel options: Many models run on natural gas or propane, offering versatility depending on your home’s setup.
- Wide range of sizes: From small homes to large estates, Generac offers systems to match every power need.
- Remote monitoring: Stay in control with mobile app access that lets you track your generator’s performance anytime, anywhere.
- Reliable brand reputation: Generac is a trusted name with decades of experience in residential and commercial backup power.
- Professional installation: Our team provides Generac backup generator installation services throughout South Florida, customized to match your home’s layout, energy needs, and available fuel source.
Pros and Cons of Different Generator Fuel Types
Choosing the right fuel source isn’t just about what’s available—it’s also about understanding how each one performs in real-world conditions. Here’s how diesel, propane, and natural gas compare when it comes to cost, efficiency, and long-term maintenance.
Diesel
Diesel generators are known for durability and high energy output, which makes them a great choice for heavy-duty applications or long outages. But they aren’t always the best option for residential use.
Pros:
- Offers high energy efficiency and longer runtime per gallon
- Fuel stores well and has a long shelf life
- Ideal for large homes or commercial use
Cons:
- Typically louder than gas or propane units
- More expensive upfront and during installation
- Emits more pollutants than other fuels
Propane
Propane strikes a balance between efficiency and cleanliness. It’s easy to store and doesn’t degrade over time, which is why it’s a popular choice for homes without natural gas access.
Pros:
- Clean-burning and environmentally friendly
- Long shelf life—no risk of fuel going bad
- Available in above- or underground tank setups
Cons:
- Higher operating cost per hour compared to natural gas
- Refueling can be inconvenient without automatic delivery
- Less energy-dense than diesel
If you’re considering a propane setup, be sure to discuss tank size and delivery options during your initial consultation.
Natural Gas
For most homeowners in urban or suburban neighborhoods, natural gas is the most convenient and cost-effective option.
Pros:
- Unlimited fuel supply when connected to a utility line
- Burns clean with minimal emissions
- Low cost and minimal maintenance
Cons:
- Not available in all areas
- Susceptible to disruptions if utility service is interrupted
- Lower energy output than diesel (though sufficient for most home needs)
Popular Generac Generator Lines
Generac offers a range of generator lines to meet the power needs of different homes and lifestyles. Whether you’re looking for off-grid capability, quiet operation, or just reliable backup for essentials, there’s a model designed for your situation.
Guardian Series Generators
The Guardian Series is one of Generac’s most popular home standby options. These generators are fully automatic, compatible with both natural gas and propane, and available in a wide range of sizes. They’re ideal for homeowners who want hands-free power protection with remote monitoring and self-testing capabilities.
EcoGen Series Generators
If you live off the grid or use solar power, the EcoGen Series is designed specifically for you. These generators work in conjunction with renewable energy systems and are optimized for low-emission performance. They’re also compatible with liquid propane for cleaner, long-term operation.
Centurion Series Generators
The Centurion Series offers dependable backup for medium to large homes, with weather-resistant enclosures and smart transfer switch integration. These units are built for durability in areas prone to storms or frequent outages.
QuietSource Series Generators
If you want quality backup power without compromising peace and quiet, the QuietSource Series delivers commercial-grade power with sound-dampening technology. These units are ideal for luxury homes, home offices, or anyone who values low noise during operation.
Protector Series Generators
The Protector Series provides high-capacity power for large estates, commercial buildings, or properties with high energy demands. These diesel-fueled models are known for longevity and are often used in areas where power loss can’t be tolerated.
Check out our full lineup of Generac Protector series generators to see if this heavy-duty solution is right for you.
Generac Generator Installation and Repair Services
Whether you’re planning to install a new unit or need service for an existing one, Reliable Power Systems is your trusted partner for backup power across South Florida.
With over two decades of experience, we help homeowners find the right generator model and fuel setup through personalized consultations and expert recommendations. Our licensed electricians provide efficient generator repair and proactive generator maintenance to ensure your system runs smoothly year-round.
Looking for a team that’s local, reliable, and deeply experienced with Generac? Get a backup power you can rely on by calling our Reliable Power Systems or scheduling your service online.
