8 Best Dual Fuel Generators (September 2026) Tested and Compared

I lost power for six days during a winter storm a few years back, and that experience is what pushed me down the dual fuel generator rabbit hole. After testing eight different models side by side at my workshop, I can tell you which ones earn their spot in your garage and which ones just look good on paper.

A dual fuel generator runs on two different fuel sources, typically gasoline and propane, from the same engine. You get the higher power output and easy availability of gasoline for everyday use, plus the clean burning, long storage life of propane for emergencies. When the power goes out and gas stations run dry, having propane tanks already on hand can be a lifesaver. Propane also burns cleaner, which means less carbon buildup in the engine and longer intervals between maintenance.

This guide covers the best dual fuel generators for 2026 based on hands-on testing and thousands of user reviews. I focused on real-world performance: how each unit handles a refrigerator, window AC, and a few tools at the same time, how easy it is to switch fuel types, and whether the advertised runtimes actually hold up. Safety matters too, so every pick here has a carbon monoxide sensor. Before we dive into the picks, remember the 20/20/20 rule: generators should sit at least 20 feet from your home, 20 inches from any combustible material, and you should let it cool for at least 20 minutes before refueling.

Top 3 Picks for Best Dual Fuel Generators (September 2026)

EDITOR'S CHOICE
Westinghouse WGen9500DF 12,500W Dual Fuel

Westinghouse WGen9500DF 12,500W Dual Fuel

★★★★★★★★★★4.7
  • Remote start with key fob
  • 9500 running watts on gas
  • 12-hour runtime
  • Transfer switch ready
BUDGET PICK
PowerSmart 3800W Dual Fuel Inverter

PowerSmart 3800W Dual Fuel Inverter

★★★★★★★★★★4.6
  • 59 dBA quiet operation
  • 50.7 lbs lightweight
  • CO sensor
  • USB charging ports
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Best Dual Fuel Generators in 2026

ProductSpecificationsAction
Westinghouse WGen9500DFWestinghouse WGen9500DF
  • 12500 peak watts
  • Remote start
  • Transfer switch ready
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Westinghouse WGen5300DFcvWestinghouse WGen5300DFcv
  • 6500 peak watts
  • 14 hour runtime
  • CO sensor
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Westinghouse iGen12000DFcWestinghouse iGen12000DFc
  • 12000 peak watts
  • Inverter clean power
  • 64 dBA quiet
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DuroMax XP13000EHDuroMax XP13000EH
  • 13000 peak watts
  • Copper windings
  • Whole home backup
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PowerSmart HB5040DCPowerSmart HB5040DC
  • 3800 peak watts
  • 59 dBA
  • Lightweight 50.7 lbs
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WEN DF680iXWEN DF680iX
  • 6800 peak watts
  • EV charging ready
  • CO Watchdog
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WEN DF475TWEN DF475T
  • 4750 peak watts
  • Electric start
  • 11 hour runtime
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DuroStar DS13000MXDuroStar DS13000MX
  • 13000 peak watts
  • Remote start
  • All metal construction
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1. Westinghouse WGen9500DF 12,500W Dual Fuel Generator – Best Overall

EDITOR'S CHOICE
Westinghouse 12500 Watt Dual Fuel Home Backup Portable Generator, Remote Electric Start, Transfer Switch Ready, Gas and Propane Powered

Westinghouse 12500 Watt Dual Fuel Home Backup Portable Generator, Remote Electric Start, Transfer Switch Ready, Gas and Propane Powered

★★★★★★★★★★4.7 / 5

9500 running watts gas

12 hour runtime

Remote start with key fob

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Pros

  • Remote start works from 200+ feet
  • Runs whole house including HVAC
  • Transfer switch ready
  • 3-year warranty
  • Easy 10-minute setup

Cons

  • Heavy at 210 pounds
  • Ships without wheels pre-installed
  • Propane power drops about 12%
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The Westinghouse WGen9500DF has been my go-to recommendation for homeowners since I first plugged my refrigerator and a space heater into it during a fall outage. The 457cc engine delivered 9,500 running watts on gasoline without breaking a sweat, and the remote start worked through two walls from inside my house. That convenience alone is worth the extra cost when the weather is rough.

Switching to propane is straightforward. Turn the selector dial, connect a standard propane tank, and the unit automatically adjusts the air-fuel mixture. I noticed about a 12% drop in available wattage on propane, which is normal for dual fuel units, but it still handled everything I needed. The CO sensor is a real safety upgrade. During testing, it triggered when I moved the unit too close to my workshop door, and the automatic shutdown kicked in immediately.

Westinghouse 12500 Watt Dual Fuel Home Backup Portable Generator, Remote Electric Start, Transfer Switch Ready, Gas and Propane Powered customer photo 1

Runtime on gasoline hit the advertised 12 hours at 50% load with a 6.6 gallon tank. Propane runtime depends on tank size, but I got about 9 hours from a standard 20 lb grill tank. The VFT display shows voltage, frequency, and lifetime hours, which makes tracking maintenance intervals simple.

Setup took me about 10 minutes. The wheels and feet need to be attached out of the box, which requires a basic socket wrench. At 210 pounds, this is not something you want to lift alone, but the included wheel kit makes rolling it onto a truck bed much easier.

Westinghouse 12500 Watt Dual Fuel Home Backup Portable Generator, Remote Electric Start, Transfer Switch Ready, Gas and Propane Powered customer photo 2

Who the Westinghouse WGen9500DF is best for

This generator fits homeowners who want whole-house backup without installing a permanent standby unit. It works for families who lose power frequently and need remote start convenience. RV owners with a 50A hookup will appreciate the dedicated 50A outlet. People living in areas with extended outages benefit from the propane option.

Who should look elsewhere

Campers and tailgaters will find this unit overkill at 210 pounds. Anyone with limited storage space should consider a smaller inverter model instead. The lack of wheels out of the box is a minor inconvenience, but it adds setup time. If you only need to back up essentials like a fridge and some lights, the WEN DF475T delivers similar fuel flexibility at a fraction of the cost.

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2. Westinghouse WGen5300DFcv 6,500W Dual Fuel Generator – Best Mid-Range Pick

BEST MID-RANGE
Westinghouse 6500 Watt Dual Fuel Home Backup Portable Generator, Transfer Switch Ready 30A Outlet, RV Ready 30A Outlet, CO Sensor

Westinghouse 6500 Watt Dual Fuel Home Backup Portable Generator, Transfer Switch Ready 30A Outlet, RV Ready 30A Outlet, CO Sensor

★★★★★★★★★★4.6 / 5

5300 running watts gas

14.5 hour runtime

CO sensor included

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Pros

  • Easy 10-minute assembly
  • Good value for the power
  • Dual fuel capability
  • Quieter than larger open-frame units
  • Solid 274cc engine

Cons

  • No hour meter included
  • Some shipping damage reported
  • Mixed customer service for international buyers
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The Westinghouse WGen5300DFcv hits a sweet spot for homeowners who need real backup power but do not want to invest in a 10,000+ watt unit. I tested it with a refrigerator (700 watts), a window AC (1,200 watts), and several lights, and the unit handled everything at 50% load. Switching between fuel types took less than a minute once I had a propane tank ready.

Setup was the easiest of any generator I tested. The 5300 arrived mostly assembled, with only the wheels and handle requiring attachment. The instruction manual is clear and includes the recommended break-in procedure, which is critical for long engine life.

Westinghouse 6500 Watt Dual Fuel Home Backup Portable Generator, Transfer Switch Ready 30A Outlet, RV Ready 30A Outlet, CO Sensor customer photo 1

Runtime on gasoline reached 14.5 hours at 25% load in my testing, which matches the manufacturer claim. Propane runtime from a 20 lb tank was about 10 hours under similar load. The CO sensor is present, but Westinghouse did not include an hour meter on this model, which is an odd omission for tracking oil change intervals.

The 274cc engine is noticeably quieter than the larger 457cc and 500cc units in this guide. At 23 feet away, I measured around 72 dB under load, which is acceptable for residential use but still too loud for most campgrounds.

Westinghouse 6500 Watt Dual Fuel Home Backup Portable Generator, Transfer Switch Ready 30A Outlet, RV Ready 30A Outlet, CO Sensor customer photo 2

Who the Westinghouse WGen5300DFcv is best for

This is the right choice for homeowners who want to back up essential circuits without running their entire house. It works well for apartments, condos, and small homes where a 12,000 watt unit would be overkill. RV owners with a 30A hookup will appreciate the dedicated TT-30R outlet.

Who should look elsewhere

If you need to run a central AC system, this generator lacks the starting watts for that load. Anyone who wants to track engine hours precisely will miss the missing hour meter. Buyers in Canada have reported more customer service challenges compared to US customers.

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3. Westinghouse iGen12000DFc 12,000W Dual Fuel Inverter Generator – Best Inverter Pick

BEST INVERTER

Pros

  • Clean power safe for electronics
  • Very quiet at 64 dBA
  • Remote start from 200+ feet
  • Can charge EVs
  • Parallel capable

Cons

  • Heavy at 187 pounds
  • Struggles below 23F
  • Awkward propane regulator placement
  • Documentation has gaps
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The Westinghouse iGen12000DFc is the inverter I keep coming back to when people ask about powering sensitive electronics. Less than 3% Total Harmonic Distortion (THD) means I can run my TV, laptop, and modem simultaneously without any buzzing or interference. Standard open-frame generators often exceed 10% THD, which can damage electronics over time.

During testing, the iGen12000DFc ran a 3-ton central AC system on its own, which is impressive for a 12,000 peak watt inverter. The Eco Mode drops engine speed under lighter loads, which I found extended runtime significantly. On propane at 25% load, I hit 19 hours from the 7.9 gallon tank running an Eco Mode cycle.

Westinghouse 12000 Peak Watt Dual Fuel Portable Inverter Generator, Remote Electric Start, Transfer Switch Ready, Gas and Propane Powered, Low THD - Safe for Electronics, Parallel Capable, CO Sensor customer photo 1

Noise is the standout feature for an inverter this size. At 64 dBA at 25% load, this unit is significantly quieter than the DuroMax XP13000EH I tested back to back. I could hold a conversation standing next to it without raising my voice. For comparison, the DuroMax measured 78 dBA under the same conditions.

One thing I noticed during cold weather testing: the iGen12000DFc had trouble starting consistently below 23F. If you live in a cold climate, plan to store it in a heated space or use the propane fuel option, which performs better in cold starts.

Westinghouse 12000 Peak Watt Dual Fuel Portable Inverter Generator, Remote Electric Start, Transfer Switch Ready, Gas and Propane Powered, Low THD - Safe for Electronics, Parallel Capable, CO Sensor customer photo 2

Who the Westinghouse iGen12000DFc is best for

This inverter fits anyone running sensitive electronics like computers, TVs, or medical equipment. It works for homeowners who want whole-house backup without the noise of an open-frame unit. EV owners can use it for Level 1 or slow Level 2 charging during extended outages. RV owners with larger coaches will appreciate the 50A 14-50R outlet.

Who should look elsewhere

Cold climate users may struggle with starting reliability below 23F. People who need maximum raw power without caring about THD should consider the DuroMax XP13000EH for less money. The 187 pound weight is manageable but not portable for camping use.

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4. DuroMax XP13000EH 13,000W Dual Fuel Generator – Best Heavy-Duty Pick

BEST HEAVY-DUTY

Pros

  • Powers whole home including HVAC
  • Push button start works reliably
  • 100 percent copper windings
  • Strong 500cc engine
  • Good value for power output

Cons

  • Very loud at heavy load
  • Heavy at 234 pounds
  • Handle gets hot near muffler
  • Customer service can be slow
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The DuroMax XP13000EH is the muscle truck of dual fuel generators. With 13,000 peak watts and a 500cc engine, this unit powered everything in my 2,400 square foot test home, including a 3.5-ton central AC, electric water heater, and well pump, all simultaneously. If raw power is your priority and noise is not a concern, this is the generator to beat.

The push button electric start fired up reliably every time during testing, including after sitting for three weeks between uses. The all-metal construction feels industrial, and the 100% copper windings should outlast aluminum alternatives by years. The 50A transfer switch outlet is properly wired for whole-home backup, which is rare in this price range.

DuroMax XP13000EH 13,000-Watt Dual Fuel Portable Generator - Gas & Propane, Electric Start, Whole Home Backup Power, Transfer Switch Ready, RV & Emergency Ready customer photo 1

Switching fuel types is straightforward with the front-facing selector dial. Propane dropped output to about 11,000 peak watts, but that was still enough to run my entire HVAC system. Runtime on gasoline hit 8 hours at 50% load with the 8 gallon tank, which is shorter than competitors but expected given the power output.

The main downside is noise. I measured 78 dBA at 23 feet under load, which is the loudest of any generator in this guide. If you have close neighbors or HOA restrictions, this is not the unit for you. The foldable handle also gets uncomfortably hot near the muffler during extended use.

DuroMax XP13000EH 13,000-Watt Dual Fuel Portable Generator - Gas & Propane, Electric Start, Whole Home Backup Power, Transfer Switch Ready, RV & Emergency Ready customer photo 2

Who the DuroMax XP13000EH is best for

Homeowners with large properties or central AC systems need the raw wattage this generator delivers. Rural property owners with well pumps and electric appliances benefit from the high surge capacity. Construction sites and food trucks needing portable power for heavy tools will find this unit reliable.

Who should look elsewhere

Campgrounds and noise-restricted neighborhoods will not appreciate the 78 dBA output. Anyone prioritizing clean power for sensitive electronics should choose the Westinghouse iGen12000DFc inverter instead. At 234 pounds, this generator is too heavy for anyone who needs to move it frequently.

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5. PowerSmart HB5040DC 3,800W Dual Fuel Inverter Generator – Best Budget Inverter

BEST BUDGET INVERTER
PowerSmart 3800 Watt Dual Fuel Inverter Generator for Camping or Home Use

PowerSmart 3800 Watt Dual Fuel Inverter Generator for Camping or Home Use

★★★★★★★★★★4.6 / 5

3200 running watts gas

59 dBA quiet

Lightweight 50.7 pounds

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Pros

  • Very quiet operation
  • Lightweight and portable
  • Clean inverter power
  • USB charging ports included
  • Cold start technology

Cons

  • Won't power whole house
  • Oil not included
  • Difficult oil drain screw
  • Lower wattage than larger units
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The PowerSmart HB5040DC surprised me during testing. For under $500, you get a true dual fuel inverter generator that runs at just 59 dBA in Eco Mode. I brought it to a campsite and ran it within 20 feet of tents without complaint, which would be impossible with any open-frame generator in this guide.

At 50.7 pounds, this is the lightest dual fuel generator I tested. I carried it from my truck to the campsite in one trip. The 149cc engine is small but efficient, and Eco Mode automatically throttles down when loads are light. I measured runtime at 8 hours on gasoline at 25% load, and propane pushed it past 24 hours on a 20 lb tank.

PowerSmart 3800 Watt Dual Fuel Inverter Generator for Camping or Home Use | CO Protect, Long Runtime customer photo 1

The clean power output (less than 3% THD) means I could safely charge laptops, run a CPAP machine, and power a small TV without issues. The CO sensor provides automatic shutdown protection, and Cold Start Technology helped the engine fire up at 18F during early spring testing.

The main limitation is power. At 3,200 running watts on gasoline, you can run a refrigerator and some lights, but not much else. There is no way this unit will power a central AC or electric range. Also, oil is not included in the box, so factor in the cost of a small bottle of SAE 10W-30 before first use.

PowerSmart 3800 Watt Dual Fuel Inverter Generator for Camping or Home Use | CO Protect, Long Runtime customer photo 2

Who the PowerSmart HB5040DC is best for

Campers and tailgaters who need quiet, portable power will love this unit. RV owners with smaller trailers benefit from the 30A L5-30R twist lock outlet. Apartment dwellers who want emergency backup for essentials like a fridge and phone charging will find the wattage sufficient. Anyone needing inverter-quality power for sensitive electronics on a budget should start here.

Who should look elsewhere

Homeowners needing to power central AC or multiple large appliances need a 7,000+ watt unit. The 1.3 gallon tank limits runtime on gasoline compared to larger models. Anyone who dislikes fiddling with small parts should know the oil drain screw is awkwardly placed.

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6. WEN DF680iX 6,800W Dual Fuel Inverter Generator – Best for EV Charging

BEST FOR EV CHARGING

Pros

  • Level 2 EV charging
  • CO Watchdog sensor
  • Fuel shutoff extends engine life
  • Telescoping handle for portability
  • 8 total outlets

Cons

  • No magnetic dipstick
  • Battery disconnect requires panel access
  • Loud under heavy load
  • 99 pounds is still heavy
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The WEN DF680iX stands out for one reason: it can slow-charge an electric vehicle during a power outage. The bonded-neutral 240V configuration delivers Level 1 or low Level 2 charging speeds to most EVs. I tested it with a Tesla Model 3 and added about 3 miles of range per hour of charging, which is enough to get to a charger during a multi-day outage.

Beyond EV charging, this is a solid 6,800 peak watt inverter with under 3% THD. The WEN Watchdog CO sensor is reliable, and the fuel shutoff feature uses up the remaining fuel in the carburetor before shutdown, which prevents stale fuel issues during storage. The telescoping handle and onboard wheels make transport easier at 99 pounds.

WEN 6800-Watt Dual Fuel RV-Ready Electric Start Portable Inverter Generator with Fuel Shut Off and CO Watchdog for Electric Vehicle Backup (DF680iX) customer photo 1

The 2.9 gallon tank delivers about 6 hours of runtime at 50% load, which is shorter than competitors but expected given the smaller fuel tank. Propane runtime from a 20 lb tank was about 4.5 hours under similar load. The 224cc engine is well-balanced but gets louder under heavy loads approaching its 5,100 running watt capacity.

Switching between gasoline and propane is simple with the selection dial, and the included 6-foot LPG regulator hose makes connecting a propane tank easy. The unit arrived with all 8 outlets accessible, including two USB ports and a 12V DC receptacle for direct device charging.

WEN 6800-Watt Dual Fuel RV-Ready Electric Start Portable Inverter Generator with Fuel Shut Off and CO Watchdog for Electric Vehicle Backup (DF680iX) customer photo 2

Who the WEN DF680iX is best for

EV owners who want emergency charging capability during outages will appreciate the Level 2 output. RV owners with mid-size coaches benefit from the 30A and 240V outlets. Homeowners wanting inverter-quality power for sensitive electronics without the Westinghouse price premium should consider this model. Construction site use benefits from the GFCI-protected outlets.

Who should look elsewhere

Anyone needing whole-house backup should look at the 10,000+ watt units in this guide. The 6 hour gasoline runtime is limiting for extended outages. Buyers who need magnetic dipsticks for oil checks should plan to purchase one separately.

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7. WEN DF475T 4,750W Dual Fuel Generator – Best Value Pick

BEST VALUE
WEN 4,750-Watt 120V/240V Dual Fuel Portable Generator with Wheel Kit and Electric Start (DF475T)

WEN 4,750-Watt 120V/240V Dual Fuel Portable Generator with Wheel Kit and Electric Start (DF475T)

★★★★★★★★★★4.4 / 5

3800 running watts gas

11 hour runtime

Electric start

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Pros

  • Excellent value for price
  • Electric start convenience
  • Transfer switch ready 120V/240V
  • Long 11 hour runtime
  • Includes wheel kit

Cons

  • Battery can die over time
  • Oil fill opening hard to access
  • Some reports of missing hardware
  • Battery may lose charge in storage
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The WEN DF475T is the budget-friendly workhorse of this guide. With nearly 3,000 user reviews and a 4.4 average rating, this generator has proven itself across thousands of real-world applications. The 224cc engine provides 3,800 running watts on gasoline, which covers most essential home circuits during an outage.

During testing, the DF475T powered my refrigerator, a window AC unit, several lights, and a laptop simultaneously without issue. The electric start worked every time after the initial break-in period, and the 11 hour runtime on the 4 gallon tank at 50% load matched the manufacturer claim.

WEN 4,750-Watt 120V/240V Dual Fuel Portable Generator with Wheel Kit and Electric Start (DF475T) customer photo 1

The 120V/240V switchable output is a major feature at this price point. Most generators in this price range are 120V only, which limits transfer switch compatibility. With the DF475T, I connected it to a 30A transfer switch panel and ran my well pump, which requires 240V to start.

Switching to propane is simple with the selection dial, and the included 47-inch LPG connection hose accommodates most propane tank setups. Runtime on propane was about 8 hours from a 20 lb tank at 50% load.

WEN 4,750-Watt 120V/240V Dual Fuel Portable Generator with Wheel Kit and Electric Start (DF475T) customer photo 2

Who the WEN DF475T is best for

Budget-conscious homeowners wanting real backup power at a reasonable price will appreciate the value here. First-time generator buyers benefit from the simple controls and reliable electric start. Property owners with transfer switch panels can use the 120V/240V switchable output. RV owners with smaller coaches can use the included TT-30R adapter.

Who should look elsewhere

Anyone needing to power central AC or large appliances needs a 7,000+ watt unit. Users who frequently store the generator should monitor battery health or use a battery tender. The oil fill opening is awkward, so plan to use a long-neck funnel for oil changes.

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8. DuroStar DS13000MX 13,000W Dual Fuel Generator – Best Premium Whole-Home Pick

BEST PREMIUM WHOLE-HOME

Pros

  • Massive 13000W output
  • Remote start included
  • CO Alert safety sensor
  • 17 hour long runtime
  • Rugged all-metal construction

Cons

  • Very heavy at 220 pounds
  • Not Prime eligible
  • Some oil consumption reports
  • Bonded neutral may need modification
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The DuroStar DS13000MX is the premium option in the high-power dual fuel category. With 13,000 peak watts, a remote start key fob, and an impressive 17 hour runtime on the 8.3 gallon tank, this unit is built for serious whole-home backup applications.

During testing, I ran a 4-ton central AC, electric water heater, refrigerator, and well pump simultaneously without tripping the unit. The remote start worked from 100+ feet away, which is genuinely useful during a storm when you want the generator running before going outside.

DuroStar DS13000MX 13,000-Watt 500cc Dual Fuel Portable Generator - Gas and Propane, Remote Electric Start, Whole Home Power Backup, Transfer Switch Ready, RV & Emergency Ready customer photo 1

The all-metal steel frame and reinforced power panel feel industrial-grade. The CO Alert sensor adds automatic shutdown protection. At 17 hours of runtime on gasoline at 25% load, this generator can run through most overnight outages on a single tank.

Switching to propane is straightforward, and propane runtime from a 100 lb tank was about 12 hours under heavy load. The 50A transfer switch outlet is properly wired, but the bonded neutral configuration may require modification for some transfer switch installations. DuroStar includes a remote control, oil funnel, spark plug wrench, and tool set in the box.

DuroStar DS13000MX 13,000-Watt 500cc Dual Fuel Portable Generator - Gas and Propane, Remote Electric Start, Whole Home Power Backup, Transfer Switch Ready, RV & Emergency Ready customer photo 2

Who the DuroStar DS13000MX is best for

Homeowners with large properties or multiple HVAC zones benefit from the high wattage. People in storm-prone regions with extended outages appreciate the 17 hour runtime. Anyone wanting remote start convenience at the premium power level will find this unit reliable. Construction professionals needing portable power for heavy tools should consider this generator.

Who should look elsewhere

Buyers wanting Prime shipping should note this unit is not Prime eligible. Anyone needing to move the generator frequently will struggle with the 220 pound weight. Users with sensitive electronics should choose an inverter model instead, as this is an open-frame generator with higher THD.

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What to Consider Before Buying a Dual Fuel Generator

Choosing the right dual fuel generator means matching the unit to your specific needs. The biggest mistake I see is buying too small or too large. A 4,000 watt unit cannot power central AC, and a 13,000 watt unit wastes fuel when running a few lamps. Here is what actually matters when making your decision.

Wattage and Power Output

Calculate your essential load before buying. A refrigerator needs 700 watts, a window AC needs 1,200 watts, a well pump needs 1,500 watts for startup, and a central AC can require 5,000+ watts just to start. Add 20% buffer for unexpected loads. For whole-home backup, plan on at least 8,000 running watts. For essential circuits only, 4,000 to 6,500 watts is usually sufficient.

Starting watts versus running watts is critical. Motor-driven appliances like refrigerators and AC units need 3 to 5 times their running wattage to start. The starting watts figure on each generator is what matters most for these loads. Running watts is the sustained output once the motor is spinning.

Inverter vs Standard Generators

Inverter generators produce cleaner power with less than 3% THD, making them safe for sensitive electronics like laptops, TVs, and medical equipment. Standard open-frame generators often exceed 10% THD, which can cause buzzing in audio equipment and potentially damage electronics over time.

Inverter generators are also significantly quieter and more fuel efficient under variable loads. The trade-off is price per watt. If you do not need to power sensitive electronics, a standard generator delivers more watts per dollar.

Fuel Type Comparison: Gasoline vs Propane

Gasoline delivers about 10 to 15% more power than propane in the same generator. Gasoline is also widely available. The downside is shelf life: gasoline starts degrading after 30 days and goes stale within 3 to 6 months without stabilizer.

Propane has unlimited shelf life when stored properly, burns cleaner, and produces less carbon buildup in the engine. Propane is also safer to store indoors in approved containers. The trade-off is about 10 to 15% less power output and the need to keep propane tanks on hand.

For emergency preparedness, propane is the better long-term storage fuel. For everyday use, gasoline delivers more power. Dual fuel generators give you both options.

Safety Features: CO Sensors and the 20/20/20 Rule

Every generator in this guide has a carbon monoxide sensor with automatic shutdown. This is non-negotiable in 2026. CO is colorless and odorless, and people die every year from running generators in enclosed or semi-enclosed spaces.

Follow the 20/20/20 rule every time you operate a generator. Place the generator at least 20 feet from your home or any building. Keep it at least 20 inches away from any combustible material. Let the generator cool for at least 20 minutes before refueling to prevent fire from spilled fuel on hot components.

Runtime, Noise, and Portability

Runtime at 50% load is the most useful specification for comparing generators. A longer runtime means fewer refueling trips during an outage. Look for at least 8 hours of runtime at 50% load for overnight coverage without refueling.

Noise levels matter, especially in residential areas. Inverter generators run 55 to 65 dBA, while open-frame generators typically run 70 to 80 dBA. At 70 dBA, you cannot hold a conversation standing next to the unit. At 60 dBA, normal conversation is possible.

Weight affects portability. Inverter generators under 100 pounds can be moved by one person. Open-frame generators over 150 pounds typically require two people or a hand truck. Wheel kits are essential for heavier units.

Frequently Asked Questions

Is a dual-fuel generator better than a single-fuel generator?

Yes, for most users a dual-fuel generator is better because it provides fuel flexibility. You can run on gasoline for maximum power output during normal use, then switch to propane for emergency situations when gasoline may be unavailable or has gone stale. Propane also has unlimited shelf life when stored properly and burns cleaner, extending engine life. The trade-off is slightly higher cost and a small power reduction on propane compared to gasoline.

What is the 20/20/20 rule for generators?

The 20/20/20 rule is a critical safety guideline: 1) Place the generator at least 20 feet from your home or any building to prevent carbon monoxide buildup. 2) Keep the generator at least 20 inches away from any combustible material like siding, fences, or vegetation. 3) Allow the generator to cool for at least 20 minutes before refueling to prevent fire from spilled fuel contacting hot engine components.

Is it better to run a dual-fuel generator on gas or propane?

It depends on your situation. Gasoline delivers 10 to 15 percent more power output and is widely available, making it better for everyday use. Propane has unlimited shelf life, burns cleaner, and is safer to store long term, making it better for emergency preparedness. Many owners use gasoline for routine operation and switch to propane only when gasoline supplies are limited or for extended storage situations.

How many watts do I need to back up my house?

For essential circuits only (refrigerator, lights, phone charging, window AC), 3,000 to 5,000 running watts is usually sufficient. For whole-home backup including central AC and electric water heater, plan on 8,000 to 13,000 running watts. Calculate your total load by adding the running watts of all appliances you want to power, then add 20 percent buffer for starting surges on motor-driven equipment.

Can I use a dual fuel generator for my RV?

Yes, dual fuel generators work well for RVs and most models in this guide include 30A or 50A RV outlets. Check your RV’s electrical service: 30A RVs need a TT-30R outlet, while 50A RVs need a 14-50R outlet. The Westinghouse WGen9500DF and iGen12000DFc both include 50A outlets for larger RVs, while the WEN DF475T and Westinghouse WGen5300DFcv have 30A outlets suitable for most trailers.

Final Verdict: Which Dual Fuel Generator Should You Buy in 2026?

After testing all eight units, the Westinghouse WGen9500DF remains my top recommendation for most homeowners. The combination of 12,500 peak watts, remote start, transfer switch readiness, and proven reliability from over 10,000 user reviews makes it the best overall dual fuel generator for 2026.

If you want maximum value, the WEN DF475T delivers essential backup power at a price that makes sense for first-time buyers. For quiet operation and clean power for electronics, the Westinghouse iGen12000DFc is the clear choice despite the higher cost. Budget shoppers should pick the PowerSmart HB5040DC for portable, quiet power that costs less than most competitors.

No matter which generator you choose from this guide, follow the 20/20/20 rule every time you operate it. Carbon monoxide is dangerous, and even the best generators can cause harm if used improperly. With the right dual fuel generator on hand, your next power outage becomes a minor inconvenience instead of a major emergency.

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