Tri-Fuel Generator: What It Is and Whether It Is Worth the Cost

This post contains affiliate links. If you purchase through our links we may earn a small commission at no extra cost to you.

What Is a Tri-Fuel Generator?

A tri-fuel generator can run on three different fuel sources: gasoline, propane, and natural gas. Where dual fuel generators offer the choice between gasoline and propane, tri-fuel adds natural gas — the piped utility fuel that flows continuously to your home without requiring storage or delivery. The ability to run on natural gas turns a portable generator into something closer to a standby generator in terms of fuel security — as long as the gas lines are intact, the generator runs indefinitely.

Tri-fuel generators have grown significantly in the market over the past three years. Several manufacturers — Westinghouse, DuroMax, and WEN — offer tri-fuel portable generators at competitive prices, making this a real option for homeowners who want maximum fuel flexibility without the cost of a permanently installed standby unit.

The Three Fuel Sources and Their Trade-Offs

Gasoline

Gasoline produces the highest power output of the three fuels on the same engine. Most tri-fuel generators are rated at their maximum wattage on gasoline. The trade-offs are storage requirements, ethanol degradation over time, and availability concerns during extended regional outages when gas stations lose power or run out of fuel. Runtime on gasoline is typically 8 to 12 hours per fill depending on load and tank size.

Propane

Propane stores indefinitely without degradation — a 100-pound tank of propane purchased today is still fully usable in 10 years. It burns cleaner than gasoline, producing less carbon buildup in the engine. The trade-off is reduced output — typically 10 to 15 percent less wattage than gasoline on the same engine. Propane requires either a large stationary tank (typically 100 to 500 gallons) or multiple portable 20-pound cylinders. Each 20-pound cylinder provides approximately 4 to 5 hours of runtime at 50% load on a 7,500W generator.

Natural Gas

Natural gas is the most compelling fuel option for extended outages in areas with underground gas infrastructure. As long as your gas service is active — which it typically is even during power outages, since gas pressure is maintained independently of the electrical grid — a generator running on natural gas runs indefinitely without refueling. There is no tank to fill, no fuel to store, and no delivery to schedule.

The trade-offs: natural gas produces the lowest output of the three fuels — typically 20 to 25 percent less than gasoline on the same engine. And in some disaster scenarios (major earthquakes, severe infrastructure damage), gas service can be interrupted along with electrical service.

Top Tri-Fuel Generators in 2026

Westinghouse WGen12000DF Tri-Fuel — Best Overall

The Westinghouse WGen12000 tri-fuel is one of the highest-output portable tri-fuel generators available at a consumer price point. With 12,500 starting watts and 10,000 running watts on gasoline, it covers even large homes with central AC and multiple major appliances running simultaneously. The remote electric start, 6.6-gallon tank, and included propane regulator hose make it practical for immediate deployment. The natural gas connection requires a standard 3/8″ low-pressure regulator fitting available at most hardware stores.

View the Westinghouse Tri-Fuel Generator on Amazon

DuroMax XP13000HXT — Best Value Tri-Fuel

DuroMax has carved out a strong position in the value-oriented generator market, and the XP13000HXT tri-fuel is one of their strongest offerings. At 13,000 starting watts and 10,500 running watts on gasoline, it matches or exceeds most competitors at a lower price point. The CO Alert auto-shutoff is a key safety feature. Electric start and remote start are standard.

View the DuroMax XP13000HXT on Amazon

Who Should Buy a Tri-Fuel Generator

Tri-fuel makes the most compelling case for homeowners in these specific situations:

• You already have natural gas service and want standby-like fuel security without standby installation costs. Running a tri-fuel portable on your home’s natural gas supply during an outage — through a proper generator inlet connection — eliminates the fuel resupply problem entirely at a fraction of standby generator installed cost.
• You live in an area with frequent multi-day outages and unreliable gasoline availability after major storms. Having three independent fuel sources means you are unlikely to be stuck without power regardless of which supply chains are disrupted.
• You already have a propane tank for heating or cooking. If a 100+ gallon propane tank is already on your property, the incremental cost of a tri-fuel generator over a dual-fuel unit is small relative to the flexibility gained.

The Natural Gas Connection: What Installation Involves

Connecting a portable tri-fuel generator to your home’s natural gas supply requires a licensed plumber or gas fitter to run a gas line to an exterior quick-connect fitting near your generator’s typical operating location. The generator connects via a flexible appliance connector — similar to what connects a gas dryer or range. A gas shutoff valve allows the supply to be closed when the generator is not in use.

This connection typically costs $200 to $600 in materials and labor — significantly less than a standby generator installation — and permanently solves the fuel supply problem for future outages. If you plan to connect to natural gas, discuss the connection with your generator installer during the transfer switch installation to run both gas and electrical connections at the same time.

Tri-Fuel vs Dual Fuel: Is the Premium Worth It?

Tri-fuel generators typically cost $100 to $300 more than comparable dual-fuel units. For homeowners with access to natural gas at their property, that premium is clearly worth it — natural gas supply is essentially unlimited and eliminates the primary weakness of both gasoline and propane (finite supply requiring resupply). For homeowners without natural gas service (rural propane-only or all-electric homes), a dual-fuel generator at a lower price point covers the same bases without paying for a capability you cannot use.

Bottom Line

Tri-fuel generators represent excellent value for homeowners with natural gas service who want the fuel security benefits of indefinite runtime without the installation cost of a standby generator. The Westinghouse WGen12000 and DuroMax XP13000HXT are the strongest tri-fuel options at competitive price points. If you have natural gas service and want to run a portable generator during outages, spending the modest premium for tri-fuel capability is one of the best generator purchasing decisions available.