Dual Fuel vs Single Fuel Generator: What Listings Say

What the listing terms mean

A single fuel generator, often called gasoline-only, is built to run on one fuel: gasoline. The listing title usually states the wattage and may say "gas" or "gasoline." A dual fuel generator runs on gasoline or propane. The title often includes "dual fuel" or "gas/propane." Both are portable generators that you place outside and connect appliances to with cords.

The main difference is the fuel system. A dual fuel generator has a regulator and a hose connection for a propane tank, plus a gasoline tank. A single fuel generator has only the gasoline tank. The listing will state which fuels the engine accepts. Read the title and the bullet list to confirm the fuel types before you compare models. For a deeper look at how to read generator titles, see the guide to dual fuel generators.

Fuel flexibility during an outage

Fuel flexibility means having more than one way to keep the generator running. With a dual fuel generator, you can switch between gasoline and propane. If one fuel is hard to find or store, you have the other. A single fuel generator limits you to gasoline, so your preparation depends on having enough gasoline stored safely.

The Florida Division of Emergency Management advises having enough fuel stored safely before a storm and checking your generator before hurricane season. The National Weather Service also recommends checking emergency equipment, such as generators, before the season begins. A dual fuel generator gives you a second option, but you still need to store fuel according to the maker's manual and local rules. If you are weighing fuel types, the best dual fuel generator guide compares models on stated details.

Storage and fuel life

Gasoline and propane store differently. Gasoline can degrade over time, so you may need to use a stabilizer or rotate your supply. Propane is stored in tanks and does not degrade the same way, but tanks have their own storage rules. The maker's manual will list the recommended storage conditions for both fuels.

For a Florida home, heat and humidity can affect how you store fuel. The Florida Division of Emergency Management says to have enough fuel stored safely, but does not give specific amounts. Check with your local emergency management office for guidance on fuel storage in your area. The maker's manual is the authority on how to store fuel for your specific generator. If you are considering a larger unit for a house, the large portable generator guide may help.

Runtime and output considerations

Runtime is how long a generator runs on a full tank of fuel. The listing may state runtime in hours at a given load, such as "8 hours at 50% load." This figure depends on the fuel type, the load, and the generator's efficiency. A dual fuel generator may have different runtimes for gasoline and propane, so read the listing carefully.

Output is measured in watts. The title often shows a starting watts figure and a running watts figure. Starting watts is the brief surge needed to start motors, and running watts is the continuous output. The EIA explains that electricity is measured in watts. For a generator, the running watts figure tells you what it can power continuously. Read the appliance labels to understand what you need, and ask an electrician if you are unsure about your load. The 3000 to 5000 watt generator guide covers common sizes for home backup.

What to consider for Florida

In Florida, hurricane season runs from June 1 to November 30, according to the National Weather Service. Before the season, the Florida Division of Emergency Management recommends checking your generator and having fuel stored safely. A dual fuel generator gives you a second fuel option, which can be useful if gasoline is hard to find after a storm.

If you live in an apartment or condo, the Florida Division of Emergency Management notes that generators may not be needed, and you should check with your building management about existing backup power. For a house, a dual fuel generator may offer more flexibility. Consider how you will store fuel, how much runtime you need, and what appliances you want to power. The site's guides compare generators on stated details, not on fuel availability. For apartment dwellers, the power station for apartments guide explains battery alternatives.

Safety and manuals

Generators produce carbon monoxide, which is odorless and colorless. The CPSC warns that using a generator indoors can kill you in minutes. Always follow the maker's manual and read the CPSC, CDC, NFPA, and Florida Division of Emergency Management pages for generator safety. Never run a generator indoors or in a garage.

The Florida Division of Emergency Management says to operate generators outdoors, away from windows and doors, and to keep them dry. Before refueling, turn off the generator and let it cool. Read the manual for your specific model and follow all safety instructions. This article does not give placement advice; the manual and the safety agencies do. If you want a generator with a carbon monoxide sensor, the CO sensor generator guide lists models that include that feature.

What to pick for your situation

Questions

What is a dual fuel generator?

A dual fuel generator runs on gasoline or propane. The listing will state both fuel types. It gives you a second fuel option during an outage.

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

It depends on your needs. A dual fuel generator offers fuel flexibility, but a single fuel generator may be simpler. Compare the stated details in the listings.

How do I store fuel for a generator?

Follow the maker's manual for storage conditions. The Florida Division of Emergency Management advises having enough fuel stored safely. Check local rules for fuel storage.

Can I use a generator in an apartment?

The Florida Division of Emergency Management says generators may not be needed in apartments or condos. Check with your building management about existing backup power.

What is the difference between starting watts and running watts?

Starting watts is the brief surge needed to start motors. Running watts is the continuous output. The EIA explains that electricity is measured in watts. Read the listing for both figures.