Fuel type for Home Backup Generators: How to Choose Yours

Fuel type is the fuel a home backup generator uses to make electricity, such as gasoline, natural gas, or dual fuel. Your utility hookup, fuel access, and whether you want one fuel or two decide which type fits you. Check what fuel is already available at your property before you compare anything else.

Which fuel type matches your situation?

Where these choices show up in our reviews

From $4329 to $5255.10: 3 of the 7 in this category we have reviewed in full.

How do you check your own fuel type before ordering?

Start with the fuel source already on your property. If you have a natural gas service line, that points you toward natural gas or dual fuel; if you do not, gasoline or dual fuel stays in play.

Then check where fuel would be stored during an outage. Gasoline needs a safe storage plan, while natural gas depends on the utility connection and dual fuel gives you both paths if the listing states both fuels.

One listing in the screened set did not state a fuel type at all. If a listing leaves that blank, do not assume the fuel source from the product category name alone.

A simple example is a house with a gas meter and a long outage season. That setup makes natural gas or dual fuel easier to justify than gasoline alone, because the fuel source is already on site.

You should also view our comparison of home backup generators for sensitive electronics to ensure your high-end equipment stays safe.

Look at your own utility bill, meter, or property records before you decide. If the property has no gas service, you can rule out natural gas as the only fuel choice and focus on gasoline or dual fuel instead.

What goes wrong when the fuel type is wrong?

Wrong fuel type shows up as a generator that does not match the fuel you can actually supply. If you choose natural gas without a gas line, the unit cannot use the fuel source you planned on.

Gasoline causes a different problem. It needs storage, and storage means you have to keep fuel on hand and manage it over time.

Dual fuel can also be a poor fit if you never plan to use the second fuel. In that case, you pay for flexibility you may not need, and the extra option does not solve a fuel-access problem by itself.

The mistake usually appears during an outage, not at checkout. You discover the mismatch when the generator is ready but the fuel source is not.

Understanding your power needs is easier once you learn how to select the correct voltage for your specific generator requirements.

What should you do when two fuel types both fit?

If two fuel types both fit your property, choose the one that matches your fuel access and storage comfort. Natural gas makes sense when the line is already there, while dual fuel gives you a second option if fuel supply is uncertain.

Gasoline is the fallback when you want a simple fuel source and can store it properly. Dual fuel becomes the safer tie-breaker when you are between one fuel that depends on a utility line and another that depends on stored liquid fuel.

If your property has natural gas and you still want backup flexibility, dual fuel is the more flexible choice. If you know you will only use one fuel and want fewer decisions during an outage, pick the single fuel that matches your setup.

Returns and sizing policy matter here only if the listing allows a fuel-type exchange or if your installer needs a specific fuel connection. Check those terms before you order, because fuel type is hard to change after purchase.

Reviewed by the Predicament Measures editorial team.