Best Dual Fuel Generators of 2021 | Comparison Chart & Reviews

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If you are a business or house owner, you might sometimes face the situation when can’t run appliances because the grid is down.

One of the solutions can be a dual-fuel generator. A dual fuel generator does the same job as a single fuel generator, but the difference is unlike single fuel generators, these generators can run on propane or gasoline as well. This flexibility of choosing the fuel will let you use the best-suited fuel for different applications like power requirement, noise, restriction on fuel availability in the area, and the fuel you have at hand.

The dual fuel generator will be cost-effective and eco-friendly and will satisfy all your power needs. Here we have compiled a list of the best dual fuel generators available in the market right now.

Best Dual Fuel Generator
Champion 76533 (Best Overall)
  • Surge Watts / Continuous Watts (Gas): 4750/3800
  • Surge Watts / Continuous Watts (Propane): 4275/3420
  • Run-Time (Gas): 9 hrs @ 50% load
  • Run-Time (Propane): 10.5 hrs @ 50% load (20-pound tank)
  • Start Type: Electric & Recoil
  • Noise Level: 68 dBA
  • Weight: 122 pounds
  • Warranty: 3 years
DuroMax XP12000EH (Highest Power Output)
  • Surge Watts / Continuous Watts (Gas): 12000/9500
  • Surge Watts / Continuous Watts (Propane): 10200/8075
  • Run-Time (Gas): 10 hrs @ 50% load
  • Run-Time (Propane): 5 hrs @ 25% load (5-gallon tank)
  • Start Type: Electric & Recoil
  • Noise Level: 74 dBA
  • Weight: 224 pounds
  • Warranty: 3 years
Champion 100263 (Best Dual-fuel Inverter Generator)
  • Surge Watts / Continuous Watts (Gas): 3400/3100
  • Surge Watts / Continuous Watts (Propane): 3060/2790
  • Run-Time (Gas): 7.5 hrs. @ 25% load
  • Run-Time (Propane): 14.5 hrs. @ 25% load (20-pound tank)
  • Start Type: Electric + Recoil
  • Noise Level: 59 dBA from 23 feet
  • Weight: 95 pounds
  • Warranty: 3 years
  • Special Feature: RV-ready, Quick touch panel, Eco-mode, Compact & Lightweight
WEN DF475T (Cheapest Dual-fuel Generator)
  • Surge Watts / Continuous Watts (Gas): 4750/3800
  • Surge Watts / Continuous Watts (Propane): 4350/3500
  • Run-Time (Gas): 11 hrs @ 50% load
  • Run-Time (Propane): 8 hrs @ 50% load
  • Start Type: Electric + Recoil
  • Noise Level: 69 dBA
  • Weight: 105 pounds
  • Warranty: 2 year
Champion 200914 (Cheapest Dual-fuel Inverter Generator)
  • Surge Watts / Continuous Watts (Gas): 4250/3500
  • Surge Watts / Continuous Watts (Propane): 3825/3150
  • Run-Time (Gas): 22 hrs @ 25% load
  • Run-Time (Propane): 14 hrs @ 25% load (20-pound tank)
  • Start Type: Recoil with Cold start
  • Noise Level: 64 dBA
  • Weight: 90 pounds
  • Warranty: 3 years
Westinghouse WGen7500DF
  • Surge Watts / Continuous Watts (Gas): 9500/7500
  • Surge Watts / Continuous Watts (Propane): 8550/6750
  • Run-Time (Gas): 16 hrs @ 25% load
  • Run-Time (Propane): 12 hrs @ 25% load
  • Start Type: Wireless, Electric & Recoil
  • Noise Level: 58 dBA
  • Weight: 192 pounds
  • Warranty: 3 years
  • Special Feature: Wireless Start, GFCI Outlets, VFT DATA Display & Transfer Switch Ready Port
Champion 200961
  • Surge Watts / Continuous Watts (Gas): 2500/1850
  • Surge Watts / Continuous Watts (Propane): 2500/1665
  • Run-Time (Gas): 11.5 hrs @ 25% load
  • Run-Time (Propane): 34 hrs @ 25% load (20-pound tank)
  • Start Type: Recoil with Cold start
  • Noise Level: 53 dBA
  • Weight: 39 pounds
  • Warranty: 3 years
Rainier R12000DF
  • Surge Watts / Continuous Watts (Gas): 12000/9500
  • Surge Watts / Continuous Watts (Propane): 10800/8550
  • Run-Time (Gas): 17 hrs @ 25% load
  • Run-Time (Propane): 15 hrs @ 25% load
  • Start Type: Electric & Recoil
  • Noise Level: 72 dBA
  • Weight: 196 pounds
  • Warranty: 3 years

Best Dual Fuel Generator

1. Champion 76533 4750/3800-Watt Dual Fuel Generator

Champion 76533 3800-Watt Dual Fuel Generator

Champion is a known name in the industry for providing the best in class power generators, and the 76533 is no different.

It works on two fuels; you can use either gasoline or propane. If the tank is full of gas, then the 224cc 4-stroke engine, which is EPA and CARB compliant, supplies 4750 peak watts and 3800 running watts, but if you are using propane, then you will get 3420 peak watts and 4275 running watts, which is less than what you get on the gas.

With the 3.4 gallons of a tank full of gas, the generator offers 9 hours of runtime. On the other hand, if the generator is running on the propane, the run time will be 10.5 hours.

Moving on, you won’t have to worry about the starting of the generator even if you are staying in the coldest area thanks to its electric start, which offers a hassle-free starting. Note that the Pull recoil starter is also provided along with the electric start.

With its RV ready 120V 30A outlet, you can easily connect it to the RV. Besides the RV outlet, it also comes with a 30A locking outlet and two standard 120V outlets. Each of these outlets comes with an inbuilt circuit breaker and the Volt guard protection to prevent any damage to the electrical appliances due to the voltage surges.

Also, to keep an eye on different parameters, the generator has a display that shows the voltage, frequency, and runtime. It has low oil shut-off sensors, which will stop the generator if the oil level falls below a certain level. This generator’s impressive feature to run so quietly creates just 68 dB of noise, which is very less compared to other generators.

With the purchase of this unit, you will get 3 years of warranty and a lifetime of technical support from their friendly team of experts.


  • The engine is CARB and EPA compliant.
  • Inbuilt volt guard and circuit breaker protection.
  • Electric start.
  • Less noise.
  • Low oil shut-off.


  • Less wattage on the use of propane.
  • It doesn’t feature the inverter generator technology.

2. DuroMax XP12000EH 12000 Watt Dual Fuel Generator

DuroMax XP12000EH 12000 Watt Dual Fuel Generator

This portable dual fuel generator is one of the most powerful generators from the DuroMax. It works on either gas or propane, and the gas is conventional, tried, and tested fuel while the propane is cost-effective, can be stored for longer periods, and doesn’t damage the carburetor of the engine.

That brings me to the powerful 4-stroke 457cc OHV engine, which is capable of generating the 12,000 peak watts and the 9500 running watts when the 8.3-gallon tank is full of gasoline. Also, note that the engine is EPA and CARB approved.

With that power at your disposal, you can run most of the appliances of the house, including the high power-consuming air conditioners. It is a true backup solution for the home’s power needs in times of power outages or storms.

What’s more, with the gas tank full, the generator offers 8 hours of runtime, and the electric start of the generator makes it very easy and convenient to start the generator without any hassle. Besides electric start, the generator also features the pull starting mechanism.

To access the generated power from the equipment, it’s panel consists of two 120V/20AMP outlets, one 120v/30AMP twist-lock outlet, a 120/240V 30AMP outlet, and a 50-amp heavy-duty outlet. Any heavy-duty appliances can be powered through a 50 AMP outlet.

What makes this generator so unique is its ability to double the power when needed through the 120-volt outlet to supply the heavy loads; this can be done by the DuroMax’s unique MX2 switch. The panel also has a voltmeter, circuit breaker, low oil indicator, and idle control.

By any means, this is not a silent generator, and that should not come as a surprise because of its powerful engine. The unit generates a noise level of 74 dBA, which is louder than the average vacuum cleaner.

This high-performance beast comes with 3 years of warranty from the manufacturer.


  • Powerful performance.
  • DuroMax’s unique MX2 switch.
  • Heavy-duty 50 A outlet.
  • Sturdy and robust design.


  • Wheels are not so effective in transportation.
  • It is hard to find the service center if a fault occurs.

3. Champion 3400-Watt Dual Fuel Portable Inverter Generator

Champion 3400-Watt Dual Fuel Portable Inverter Generator

Champion, the known name for their quality products, brings this portable dual-fuel inverter generator. It is highly versatile and very convenient to use; whether it is your home or camping site, this generator is your go-to.

Let’s start with the outlets they have given to bring out the energy generated. The unit comes with many outlets from which 120V 30A is the one that will let you connect the generator directly to the RV. It also has two 120V 20A household outlets, a 12V DC automotive-style outlet with a dual USB adapter.

When in operation, the engine creates a noise of 59 decibels, which is quite low according to my experience with generators. You can start the generator with an electric start, and it works really well even if you reside in the coldest part of the world. This is because of the cold start technology, which ensures a quick start in the coldest weather.

The highlight of this tool is its ability to supply the power to the electronic equipment directly from the outlets. Since this is an inverter generator that will have very little THD of around 3% in output power, this makes it safe for modern electronics.

Moving on, the generator features an EPA and CARB compliant 192cc engine, which produces 3400 starting watts and 3100 watts of running watts on gasoline and will run for 7.5 hours at 25% load. If the generator is supplied from the 20-pound propane tank instead of gasoline, then the working period will be 14.5 hours with the 3060 peak watts and 2790 running watts on a 25% load.

On a lighter note, the generator features a low oil shut-off sensor and a smart economy mode that adjusts the power output based on the load. This mode will improve the life of the unit and make the operation much quieter.
To boost your confidence in the product, they are offering a 3-years of warranty and a free lifetime of technical support.


  • It is RV ready.
  • Quiet operation.
  • Sensitive electronics can be powered.
  • Remote start.
  • Parallel connection capability.


  • Very small gas tank.
  • No fuel level indicator.
  • It is difficult to fill the tank.

4. WEN DF475T 120V/240V Dual Fuel Portable Generator

WEN DF475T 120V 240V Dual Fuel Portable Generator

WEN has been producing reliable, cost-effective, and quality products since 1951. And this Wen DF475T dual fuel generator is one of those products. It is an affordable and durable product, and the important thing is you won’t have to break the bank to get yourself an excellent dual fuel generator.

This generator works on two fuels; you can use either gasoline or propane. While using the propane, the generator supplies the 4350 surges and 3500 running watts. But if you decide to pour in the gasoline, it supplies the 4750 peak watts and 3800 running watts.

With this power, you can charge up your cell phones, run the lights, TV, refrigerator, etc. When the 4-gallon tank is full of gasoline, the generator is capable of providing 11 hours of runtime on a half load. In comparison, the use of propane will provide 7 hours of runtime on the half load.

The generator features two 120 V GFCI outlets, a NEMA 30A twist lock, and a 12V DC cigarette-lighter-style plug to supply all your electrical appliances. On top of that, to supply the power to the heavy appliances, the panel consists of a voltage selector switch, which will change the voltage level from 120 V to 240 V whenever needed.

The generator can deliver 240 volts to power bigger electronic devices. The 224cc engine is CARB and EPA III compliant, which will make this a perfect backup generator for emergencies; just plug in the 30 A twist-lock into the transfer switch, and the electricity comes back.

If you are planning to take this generator to the camping site, there is no need to worry because the handle and wheels make transportation much easier.

It is also extremely well designed, and it has a robust and durable construction to carry it to the job site, and it is compact enough to make the storage easy. Along with all these features, the dual fuel generator comes with a 2-year warranty.


  • Very quiet operation.
  • Affordable.
  • Electric start.
  • Voltage selection between 120V and 240V.


  • Limited power outlets.

5. Champion 200914 4250-Watt Dual Fuel Open Frame Inverter Generator

Champion 200954 4250-Watt RV Ready Open Frame Inverter Generator

This is a powerful dual-fuel inverter generator suitable to power most of the electrical appliances in power outage situations. The name champion ensures the innovative incorporated technologies to improve the functionality and the usability of the generator.

If we talk about the electrical outlets, then the panel consists of a 120V 30A RV, two 120V 20A household outlets, and a 12V DC automotive-style outlet with a dual USB adapter included. You can directly connect it to your RV; there will be no need to buy a separate adapter.

This generator can run either on gasoline or on propane. When the 4-gallon gas tank is full, the 224cc engine produces 4250 starting watts and 3500 running watts, and it will run for 22 hours at a 25% load.

Now, if you use propane, those figures decrease slightly. With the use of a 20-pound propane tank, the generator will supply 3825 starting watts and 3150 running watts, which will run for 14 hours at 25% load.

It is extremely easy to change the fuel on which the generator will run with the help of a fuel selector dial. This is an inverter generator, which means you can supply clean power to your sensitive electrical equipment without worrying about damaging them, thanks to its low 3% THD rating.

Moreover, this generator is very quiet, and it doesn’t create chaos as conventional generators do. With a noise level of just 64 dBA, it will leave you alone when you are camping or tailgating.

The engine is EPA and CARB compliant, which means it follows most of the regulations set by the government. Also, it comes with the economy mode, which will control the engine’s speed based on the load at the end, making it quieter and fuel-efficient.

Have no doubt about the performance and the features of the generator; this is best in terms of power output and price range. To make the purchase more valuable, the manufacturer offers three years of warranty and FREE technical support for the lifetime.


  • Low oil shut-off sensor.
  • EPA and CARB compliant engine.
  • Quiet operation.
  • Suitable to power sensitive electronics.


  • Some customers have complained about receiving a faulty product.

6. Champion  200961 2500-Watt Dual Fuel Portable Inverter Generator

Champion 200961 2500-Watt Dual Fuel Portable Inverter Generator

Once again, Champion presents the dual-fuel inverter generator with an attractive look and sturdy build; its yellow finish and the sharp design give it a unique look. The unit is highly portable with a weight of just 40 pounds you can carry it wherever you want, without much effort.

To generate the power, this dual-fuel generator relies on the 79cc 4-stroke engine, which is capable of generating 2000 starting watts and 1700 running watts. The engine can run for 11.5 hours on 25% load when the 1.05-gallon gas tank is full. Moreover, the engine generates just 53 dB of noise when working, making it extremely quiet.

Now, I know that the power, this generator can supply is not enough to run all the house appliances, so before connecting it to the load, you will need to make sure which appliances it will power. Still, if you want more power than the generator supports, you can double the power output with the help of power clip-on parallel kit.

The main problem with the conventional generator is its fuel consumption; no matter the load, it will always run on the full capacity, but not the inverter generators. This unit comes with the economy mode, which will reduce the consumption of the fuel when less load is connected. This kind of operation makes the inverter generator more economical, quiet, and fuel-efficient.

When you think of a dual fuel inverter generator, the thought will be accompanied by the cleanliness of the power because that’s what you expect from the Inverter generator and this generator is no different as it also supplies the cleanest power with the THD rating of <3%. This makes it suitable to run delicate electronics.

While offering the best features, this unit also offers 3 years of manufacturer’s warranty on the product.


  • Lightweight, compact, and highly portable unit.
  • Extremely quiet performance.
  • Parallel connection is possible.
  • Competitive price point.


  • Low power output.
  • It lacks the gas and oil drain to empty the unit.

7. Rainier R12000DF Dual Fuel Portable Generator

Rainier R12000DF Dual Fuel Portable Generator

Rainier R12000DF is one of the most powerful dual fuel portable generators that can supply most of the house appliances. If you want a generator to power your RV, then R12000DF can run all appliances of your RV as well.

This product offers the choice for fuel use, and you can either use gasoline or propane. The noise this generator emits is 72 dB, which can be reasoned if you see the power output.

With the use of gasoline, the 4-stroke 457cc engine generates the 12,000 surge watts and the 9500 running watts, and if the propane is used as a fuel source, you will get 10,800 starting watts and 8550 running watts from the unit.
You will be able to store plenty of gasoline in the 6.6-gallon tank, and when this tank is full, this dual fuel generator gives you the runtime of 17 hours at the half load.

Moving on, you can either start the generator with the electric start or you can use the manual recoil starter. The recoil starter is a backup if the electric start doesn’t work. Moreover, the machine is EPA and CARB compliant, and it is also RV ready and transfer switch ready. You will just need to connect the cord to get things going.

The control panel consists of the VFT display, which monitors the Volts and frequency generated, and it also displays the lifetime hours. Besides, there are two 120V 20A GFCI household outlets, one 120V 30A outlet, one 120V 30A outlet, and one 120/240V 50A outlet on the control panel.

The generator is quite versatile and can supply many appliances simultaneously, and it will make a good pick with its 3 years of limited warranty.


  • Easily accessible control panel.
  • Overload alarm.
  • One-touch electric start.
  • Low oil shutdown.
  • RV and transfer switch ready.


  • Lacks 12V DC port.
  • No remote start.

8. Westinghouse WGen7500DF Dual Fuel Portable Generator

Westinghouse WGen7500DF Dual Fuel Portable Generator

Westinghouse makes the finest power generators, and the WGen7500DF is no different. It is a perfect backup generator for a home in case of a power outage or emergency cases.

The unit uses a 4-stroke 420cc OHV engine to generate power, which is made out of the cast iron for a longer lifespan. Also, the unit can run on gasoline as well as on propane. What is impressive about this dual-fuel technology is that you can change the fuel without turning off the generator, and it will smoothly transfer from one to another fuel.

As long as the power output is concerned, the unit delivers the 9,500 peak watts and 7,500 running watts when the generator is running on gasoline and let’s not forget the 11 hours of runtime at 50% load.

But when the 20-pound propane tank is used, the unit will provide the 8,550 peak watts and 6,750 running watts and can run for 8 hours at 50% load.

Moreover, the generator can be easily started with the electric start, and it can also be started from a distance thanks to its remote start ability. If both of them fail for some reason, then there is also a pull start. In general, you won’t be stuck without electricity if one of the starting mechanisms malfunctions.

You will be able to easily keep an eye on different parameters like voltage, frequency, and lifetime hours through the VFT display mounted on the control panel. The control panel also consists of two duplex 120 V, one 120/240 V outlet, two USB ports, and an ST switch.

On this fine piece of equipment, the manufacturer offers a 3 years warranty, and if any faults occur during that period, the company will repair it for you.


  • Push-button electric start.
  • Easy switching between the fuels.
  • Remote start feature.
  • Solid heavy-duty construction.
  • Simple maintenance.


  • A bit heavy to frequently move around.
  • The noise level is a little high.

What Are Dual Fuel Generators?

Same as single fuel generators, these are generators that can be operated with two types of fuels to generate electricity. They can use either one fuel at a time or a combination of both fuels to give better runtime and performance. Generally, the two fuels which most of the generators use are a combination of natural gas & propane, and diesel.

In most US factories, natural gas will already be available at the site, and it won’t need to be stored, which eliminates the problem of storing the diesel in large tanks to save space. While the diesel has a low ignition point, that means it will be easier to start the generator on the diesel than the natural gas.

Some people think that the duel fuel and the bi-fuel generators are the same, mind you, that’s not the case at all. The Bi-fuel generator works on the two fuels, but they are not mixed, whereas the dual-fuel generators work on the combination of two fuels in a certain proportion or a single fuel alone.

What to Consider when Buying a Dual Fuel Generator

Dual Fuel Generator Guide

Before buying a dual fuel generator, you will need to keep in mind a few important things that we have discussed below.


Generators are inherently noisy because they use an engine to generate electricity, and the engine is the main reason for the noise. This means that no matter what kind of generator you buy (except for solar generators), it is always going to be accompanied by noise.

So, it would be best if you buy the generator which produces the lowest noise. But if you come home with a dual fuel generator that creates a significant amount of noise, then it will create an uproar in your neighbors.

50 dB to 90 dB is the general range in which most of the dual fuel generator falls. The level of noise a particular generator will create highly depends on the generator output and the fuel used. Generally, gasoline-powered generators make more noise compared to propane-powered ones. So, choose the one which makes the lowest noise when all other considerations are met.

Size of a Storage Tank

Consider the dual fuels which these generators use are gasoline and propane. The propane is available in a canister and is stored under pressure. When you want the generator to run on the propane, you can just connect the hose with the unit. So propane doesn’t need to be stored means there is no need for a storage tank, but to store gasoline, the storage tank is needed.

Most of the dual-fuel generators, which are powered by gasoline, come with the storage tank, and the size of the tank can range from as small as 2 gallons to a large tank of 10 gallons. The problem with the large storage tank is its space requirement and the weight, which makes the unit less portable.

So, you should choose a dual fuel generator with a small tank size if the storage space is less and you want them to be more portable because, with the increase in the storage tank size, the overall size of the generator also increases.

Power Output

The power output of the generator is measured in peak watts and running watts. The power output of the dual-fuel generator won’t be the same for both fuels; instead, they will be different.

The generator running on propane will generate less power, and if it would have been powered by gasoline, the power output would be high. This is because gasoline burns better than propane. When supplying the generator with the propane, you should expect a reduction in power by about 10%. Propane generates less power, but it doesn’t produce harmful gases, hence keeps the environment clean.

Monitoring and Protection

If you want to know that your generator is properly working or not, then you will need to check the voltage and frequency generated by the unit. You may also want to know different parameters related to the generator for some reason. To make the monitoring easier, the dual-fuel generators come with the LED display and indicator lights on the control panel, along with another bunch of things.

The LED display will show the voltage, frequency, total runtime, wattage, and maintenance interval as well.
A good dual fuel generator will have a quality control panel, meaning various kinds of protection will be integrated into the control panel, like a low oil shutoff. To protect the generator if the oil level is low, the control panel also has overheating protection, overload protection, and circuit breakers.

So you may want to look for the generator which gives enough information about the condition of the generator, and enough protection measures are taken.


Portability represents the ease of moving around the product or to carry it from one place to another, and it highly depends on the size and the weight of the unit.

If the weight of the unit is more, it will be difficult to move it from one place to another, and you may even require support from your neighbor if the generator is too big. While if the generator is bulkier and big in size, it may be cumbersome to fit it into the car or the truck if you want to take it to the repair or transport it somewhere else.

Also, the size of the dual-fuel generators and their power output capabilities depends on each other. The more power you need, the size and weight of the unit is going to increase.

So you will need to choose the one which fulfills all your power requirements and at the same time stays relatively portable.

Advantages of a Dual Fuel Generator

Dual fuel generators have many advantages, and some of them are discussed below.


The main advantage of the dual fuel generator is its ability to supply continuous and uninterrupted power in the situations of a power outage or natural disasters.

They can supply the power for more than 24 hours if both the fuels are properly utilized. It will be enough for many households and important places where the downtime of even an hour is not allowed, like hospitals, factories, and some businesses.

When the gasoline alone is used as fuel, it provides the high output wattage but to supply the high wattage, it also burns faster, which results in less runtime. Besides, most of the generator comes with tanks that can hold a few gallons of gasoline, which won’t give a runtime of even 12 hours.

On the other hand, propane burns slower, and this slow-burning will result in longer runtime, but it won’t be able to provide the wattage same as gasoline. Propane is available in canisters, so you won’t need tanks to store them.

Their availability can range from 5 gallons to 120 gallons of tanks, which can supply the electricity for almost 20+ hours.

Now, if we talk about the dual fuel generator, which can work on both gas and propane, then it offers the advantages offered by both fuels. When one runs out, you can use another, and you will have an uninterrupted power supply that can supply the power for more than a day.

Effectiveness and Environmental Impact

The burning of any fossil fuel emits carbon into the environment, and these dual fuel generators are no different. They also emit gases that are hazardous to people and the environment.

The exhaust of gasoline, when used as fuel, has a more detrimental effect on the environment than the exhaust of propane, and also, the effectiveness of both the gases are not the same. Gasoline has more BTU than propane, which means the gasoline will generate more energy when it is burned compared to propane.

If you are conscious about the effect of your lifestyle choices on the environment and the reduction of a few BTUs doesn’t bother you, then the propane generator will be a good choice.

But, if you are someone who wants the same power and also cares about the environment, then the Dual fuel generators are for you my friend. When you need more power, you can increase the proportion of gasoline, and when you don’t need that, you can use more propane and less gasoline in the fuel, the exhaust of which is easy on the environment than gasoline.

This is something that you don’t get in a single fuel generator.


The capability to supply electricity using any of the two types of fuel makes these generators highly versatile.
Dual fuel generators are for those who are always out camping or running their RV around in different towns.

There might come a time when in some remotely small town, you might not be able to locate the propane tanks.
If you are in an instant need of electricity and you have a single fuel generator that only works on propane, then the first thought which will flow through your mind would be,” I should have bought a dual fuel generator. “ Because along with propane, it also runs on gasoline, which is generally available in every town.

Furthermore, in the area where hurricanes and snowstorms are regular things, you won’t have power for weeks, let alone days. In that kind of situation, a versatile dual fuel generator will become your savior and supply the electricity using any fuel you have at hand.

Effect of Temperature

Gasoline and propane both fuels are affected by temperature. If we talk about gasoline, then it doesn’t have a long life span; it will go bad in a matter of time if not properly stored. Besides, a hot climate makes it evaporate, so you can’t store it for longer periods, especially in summer.

On the other hand, the propane works just fine in the hot climate and can be stored for more than ten years, and it won’t go bad, but the downside of the propane is that it shrinks. Yes, the volume of the liquid propane shrinks in a colder climate, reducing the pressure at the regulator. The pressure may drop to that degree that it may not be able to even start the generator.

Luckily, we have a solution. You can use gasoline in the winter and propane in the summer because hot temperatures don’t affect the propane.


A simple observation would be that this kind of generators will be mostly used in harsh weather areas. This means the generator should be capable enough to ride through many of these situations. That’s why this dual fuel generator is made from durable and sturdy materials to last long.

It will keep supplying the electricity in any weather condition. These generators are built to last, but there is one culprit that can damage the generator, especially if it is sitting inside, That is gasoline. If it stays inside the machine, then it will damage the carburetor and other parts as well.

This is because when the gasoline stays idle for a long time, then the fuel will undergo a phenomenon called phase separation, where ethanol separates itself from the fuel. After that, anything that uses this gasoline will be damaged. That’s why experts suggest not to use the gasoline which sat idle for more than 3 months.

While the propane has a longer life, it stays good for more than 10 to 12 years. This means you can use propane for more general needs, and when you need more power, you can switch to gasoline. This can only be done with dual fuel generators.

Disadvantages of Dual Fuel Generator

Everything is good about these units, but we found some things which can be considered as disadvantages and they are listed below.


You can consider this as the main disadvantage. The upfront investment in the dual fuel generator of the same power rating will be more compared to the single fuel generator. You will need to figure out your needs correctly and invest in one that best suits your circumstances with the price point considered.

Bigger in Size

The other disadvantage will be the size of the units. They are generally bigger and heavier. The weight of most of the units will be more than 100 pounds. But to handle this weight, they are generally equipped with flat & sturdy tires, which will be good for any kind of terrain and the soft handle to have control over the unit.
Generally, the size and weight of the unit will increase with the power output.

Which is Better Gas or Propane?

Let’s find out which one is better.

If we talk about gasoline, then it is available in almost all towns in enough quantity to run your generator, but that’s not the case with the propane. In many of the remote places, you may not find the propane tanks or canisters to use in your generator.

Gasoline has a shorter lifespan due to phase separation and fuel gum-up and can only be stored for a maximum of 3 months; after that, it will damage the machine in which it is used. But that’s not the case with the propane; it can be stored for more than 12 years without worrying about a single thing.

Another aspect where the propane shines is its clean-burning ability than gasoline. The exhaust of gasoline is more harmful to the environment compared to propane, and it is relatively easier on the surroundings. Also, when it is burned, gasoline leaves behind the carbon deposits, which will need to be periodically removed.

When propane is used as fuel, it generates less noise compared to gasoline.

Gasoline is highly flammable, which means storing it in a large quantity will be dangerous, while propane is the least flammable fuel, and it doesn’t pose any risk if stored in higher quantities.

From this, we can conclude that despite the easy availability and high power output capabilities of gasoline, propane is better due to its long lifespan and less impact on the environment. At last, it all comes down to your power needs and personal preference.


Can I Power Sensitive Electronics with The Dual Fuel Generator?

For proper functioning of the sensitive electronics, it should be supplied with clean power. If it contains any spikes and surges, then there is a high possibility that electronics might get damaged. Generally, most of the dual-fuel generators tend to supply the square wave power on which most of the appliances will work but not all of them.

So if you want to power the sensitive electronics, then I suggest that you first make sure that the generator supplies pure sine wave with very little THD rating. If not, then keep your electronics away from the generator.

How to Increase the Runtime on A Dual Fuel Generator?

Dual fuel generators indeed provide more runtime than single fuel generators. In a single fuel generator, once the fuel is depleted, you will need to pour in more fuel and start it again to keep it going. This refilling will result in a downtime of a few moments, and if you live in a cold area, then your generator might refuse to start altogether.

Whereas for the dual fuel generator, you can run it on gasoline, and once it is depleted, you can set the knob to propane, and the generator will keep supplying power with minimal downtime.

How to Connect the Generator to The Home?

The first way to connect the generator to run different appliances would be through the power cords directly connecting the equipment to the socket of the generator. This may not be the ideal choice because it poses so many risks.

To supply the power with this method, you will need to lay down the wires in your home, and the distance shouldn’t exceed 100 feet. If that happens, then there will be a voltage drop in a cable, and some of the equipment might not work properly.

The other way is to install a transfer switch from where you can supply the most important circuits if the power goes out. Not only that, but you can also select which appliance you want to power. This is a more safe and hassle-free method.

Why Are Transfer Switches Used for Power Transfer to The House?

If you use a transfer switch, then it eliminates most of the potential accidents. If you directly connect the transfer switch to the generator, then there may be a back feed of a power which can harm the person working on a power line, or the appliances will also be damaged.

The main advantage of the transfer switch is that it prevents the simultaneous connection of the generator and the supply from the grid to house circuits, which will save your appliances and the generator as well. That’s why you shouldn’t connect the generator directly to your home.

Evans Miller

About Evans Miller

I am an electrical engineer, and I am crazy about AC machines and generators. I created this website to share my knowledge about generators and help other people. On weekends, I like to travel in my RV with my wife and kids.

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