Can Dual Fuel Generators Run on Natural Gas?

On this page (9 sections)

1. Can dual fuel generators run on natural gas?
2. What's the difference between dual fuel and tri-fuel?
3. How does natural gas change the power output?
4. What does natural gas output look like in practice?
5. What hardware do you need for a natural gas hookup?
6. Is natural gas safer than propane or gasoline?
7. Does natural gas cost less to run than propane?
8. Which tri-fuel generator fits your need?
9. The short answer on natural gas generators

Yes, dual fuel generators can run on natural gas, but not every one can. A true tri-fuel model, or a dual fuel unit fitted with a conversion kit, is the only way to use a home gas line.

If you're shopping for backup power, this answer shapes the whole decision. Natural gas changes your power output, hookup, and safety plan, and the label "dual fuel" alone doesn't promise NG.

Can dual fuel generators run on natural gas?

Only if the generator is built for it. The common dual fuel generator burns gasoline and propane, and the gas side is a propane tank connection, not a home gas line.

You'll see two labels in the market. A dual fuel unit normally means gas and propane.

A tri-fuel unit means gas, propane, and natural gas.

If your heart is set on a particular dual fuel model, a conversion kit can add NG, but you need to match the kit to the engine and carburetor. The kit has to deliver gas at the pressure and flow the generator's fuel system expects, and a mismatch is a job for a gas fitter, not a weekend project.

Start with our explainer on how does a dual fuel generator work to see what the fuel selector actually changes.

So when someone asks can dual fuel generators run on natural gas, the honest answer is: some can, and the ones that do are usually sold as tri-fuel. A kit is the fallback when the model you already own is otherwise right for your loads.

What's the difference between dual fuel and tri-fuel?

Dual fuel is gasoline and propane; tri-fuel adds natural gas. That one extra fuel is the whole gap between the two labels.

On a dual fuel unit, you switch between gasoline and LPG with a dial or a valve. On a tri-fuel unit, you get a third position and a gas connection, often a quick-connect adapter or an NG hose in the box.

The WEN TF-1450X, for instance, ships with a 6-foot LPG connection hose and an NG quick-connect adapter.

The watt rating tells you which fuels are real. A generator listing three separate outputs (gasoline, propane, NG) is a tri-fuel unit, regardless of what the badge says.

The WEN lists 14,500 surge and 11,500 running watts on gasoline, 12,500 and 10,300 on propane, and 10,500 and 8,750 on NG. Three columns like that are the giveaway.

This is why the label on the box matters more than the box's marketing. If you're weighing up the whole decision, dual fuel generator vs gas covers whether the extra fuel is worth the cost.

How does natural gas change the power output?

Natural gas delivers fewer watts than gasoline or propane on the same engine. Methane carries less energy per volume, so output drops in a predictable step.

A good example is the WEN 14500W Tri-Fuel. On gasoline it makes 14,500 surge and 11,500 running watts, on propane 12,500 surge and 10,300 running, and on natural gas 10,500 surge and 8,750 running.

The pattern holds across brands. The Westinghouse 14500W Tri-Fuel makes 14,500 peak and 11,500 running watts on gasoline.

The Westinghouse 8200W Tri-Fuel Inverter makes 8,200 peak and 6,600 running on gasoline, 7,380 peak and 5,940 running on propane, and 6,560 peak and 5,280 running on NG. Every tri-fuel unit loses watts as the fuel gets leaner.

For a home backup plan, size around the NG number. A generator that runs your furnace and fridge on gasoline might need careful load management on natural gas.

Pull the NG figure from the spec sheet first, then decide which circuits to put on the transfer switch.

That gap isn't a defect. It's the fuel, and every tri-fuel unit shows the same pattern.

What does natural gas output look like in practice?

Plan your circuits around the NG rating, not the peak gasoline figure. Then the lower fuel output won't catch you mid-outage.

Take a 14,500-watt tri-fuel like the Westinghouse 14500W Tri-Fuel. Gasoline gives it 11,500 running watts, and natural gas cuts that substantially.

Check the NG rating before you pick a transfer switch or interlock kit.

Sizing shortfalls show up as overload shutdowns when the fridge, well pump, and furnace kick on together. A 50A outlet on the Westinghouse helps here, because one cord can carry the big appliances while smaller loads sit on the 120V outlets.

Our best dual fuel generator roundup lists the models with their fuel-by-fuel numbers so you can compare.

What hardware do you need for a natural gas hookup?

A tri-fuel generator needs a gas connection point, a hose, and often a quick-connect adapter. Some models ship with these; others expect you to add them.

The WEN 14500W Tri-Fuel (TF-1450X) includes a 6-foot LPG connection hose and an NG quick-connect adapter, so it's ready for a home gas outlet. The Westinghouse 14500W Tri-Fuel has its own 30A and 50A outlets ready for a transfer switch.

Quick-connect, hose, or both?

Check the included components list before you buy. A kit that ships with a quick-connect adapter saves you a separate order.

A model that lists only a propane hose leaves the NG side to you. The WEN covers both fuels in the box, while the Westinghouse units focus their included parts on the transfer switch side.

The bigger job is the house side. A natural gas line needs a plumber or gas fitter to install an outdoor quick-connect at the right pressure and flow.

Don't improvise a hose run from a dryer valve.

Keep the connection outdoors and away from windows. The generator's fuel system is designed for a specific pressure, and your installer should confirm it.

Is natural gas safer than propane or gasoline?

Natural gas is a clean-burning fuel, but it still produces carbon monoxide. The exhaust is just as dangerous in an enclosed space.

Run the generator outdoors, well away from doors, windows, and vents. A CO sensor helps, and all three units here include one.

The WEN calls its version the Watchdog CO Shutdown Sensor, and it shuts the generator down when carbon monoxide reaches a dangerous level. That sensor is a backup, not a reason to run the unit in a garage.

Natural gas is lighter than air, so a leak rises and disperses better than a propane leak pools. The generator itself is the carbon monoxide risk here, not the fuel supply.

Other safety features worth checking

Look at the shutdown and protection features in the spec sheet. The Westinghouse 14500W Tri-Fuel lists automatic low-oil shutdown and overload protection alongside its CO sensor.

The inverter model adds GFCI outlets and a fully enclosed design. Those features don't change the outdoor rule, but they do give you a second layer when something goes wrong.

Read the manual for clearances and keep the exhaust pointed away from the house.

Does natural gas cost less to run than propane?

Per unit of energy, natural gas from a home line usually costs less than bottled propane. You also stop hauling tanks.

The catch is the lower watt output. You get fewer usable watts per unit of fuel, so the comparison isn't one-to-one.

Our can a propane generator run on natural gas post walks through whether converting a propane unit is worth it.

Runtime figures help you see the trade. The Westinghouse 14500W Tri-Fuel runs up to 19 hours at 25% load on a 9.5-gallon gas tank.

On NG there's no tank to drain, so the line sets the run time instead. The WEN lists up to 12 hours at half load on its 8.2-gallon tank.

Both numbers describe gasoline; on NG you trade tank-bound runtime for a fixed connection.

For a long outage, NG is the easier fuel. The line keeps delivering, so there's no refill run or tank swap.

That's the strongest argument for a tri-fuel generator on a home with a gas stub.

Which tri-fuel generator fits your need?

Pick a tri-fuel model if a home gas line is your main backup source. The NG output, outlet layout, and included hookup parts decide which one.

For whole-home loads, the Westinghouse 14500W Tri-Fuel runs on all three fuels and puts out 11,500 running watts on gasoline with a 550cc engine. Its 30A and 50A outlets suit a transfer switch.

Westinghouse also lists a matching WATS200 automatic transfer switch, sold separately, for hands-off backup.

When an inverter tri-fuel makes more sense

If quiet, clean power matters more than peak watts, the Westinghouse 8200W Tri-Fuel Inverter is the pick. It runs on gas, propane, or NG, keeps THD under 3%, and puts out 5,280 running watts on natural gas.

It also has a 30A RV outlet and a remote start key fob. For a trailer or a house full of electronics, the lower THD and quieter enclosure matter more than raw wattage.

For a whole house on NG, the bigger open-frame units carry the load.

The short answer on natural gas generators

Can dual fuel generators run on natural gas? Yes, if you buy tri-fuel or add a conversion kit, and you should size your backup plan around the lower NG watt rating.

A home gas line gives you endless fuel but a little less power.

The Westinghouse 14500W Tri-Fuel is the strongest all-around pick for home backup, and the WEN TF-1450X is the one to choose if you want the NG adapter in the box. The inverter model fits smaller loads and sensitive electronics.

Whichever you buy, keep it outdoors, let a gas fitter handle the house connection, and plan circuits around the natural gas rating.

Frequently asked questions

Do you lose power when running a generator on natural gas?

Yes. Natural gas carries less energy than gasoline or propane, so output drops.

A unit rated at 14,500 surge watts on gas often lands around 10,500 on NG, and running watts fall by a similar share.

Can you run a natural gas generator indoors or in a garage?

No. Natural gas burns cleaner than gasoline, but the exhaust still carries carbon monoxide.

Run the generator outdoors, away from windows and vents, and use a CO sensor as backup, not as permission to move inside.

How long can a generator run on natural gas?

As long as the home gas line keeps supplying, so a natural gas run has no fuel tank to empty. That makes long outages easier to ride out than a propane tank or a gas can you refill.