Propane Generators: Output, Run Time and Cylinder Safety

Propane is one of the fuels a portable generator can run on, usually as a dual fuel model that also takes gasoline. This guide sets out what the makers and manuals we checked say about propane operation: output, run time, cylinder safety and the models in our comparison tool. Figures were retrieved on 5 November 2026.

What changes when you run on propane

Every dual fuel portable in our database states a lower output on propane than on gasoline. Dividing each maker’s propane running watts by its gasoline running watts (a derived figure, not one the makers state) gives about 90% for eight models and 95% for the DuroMax XP13000EH.

Size your generator against the propane figure if propane is your main fuel. The size calculator and load calculator help you add up the watts.

Run time is not simply longer or shorter

Stated run times depend on the tank or cylinder the maker assumes and on the load. The Champion 201278 states 14 hours on gasoline and 21 hours on propane at 25% load, while the Westinghouse WGen14500DF states 16 hours on gasoline and 6 hours on propane at 25% load. So propane can run longer or shorter than a full gasoline tank. Check the figure and the load behind it, and use the fuel consumption calculator to estimate your own use.

Cylinder and hose safety

The Champion 201278 operator’s manual, which we read, gives these rules for propane (LPG):

• LPG vapors are heavier than air and settle in low places. LPG has a chemical added so you can smell leaks. If you smell a leak, turn off the gas supply immediately.
• Keep the cylinder upright, at ground level on a flat surface, away from heat, and out of sun and rain. Use an approved cylinder with an overfilling prevention device (OPD) valve.
• Check connections for leaks with soap and water. Growing bubbles mean a leak. If tightening a fitting does not stop it, do not use the generator.
• Never put the cylinder or hose in the path of the muffler exhaust. Never use a damaged hose or cylinder.
• Liquid propane can cause cold burns like frostbite, so wear gloves when connecting or disconnecting the cylinder.
• The included hose works with standard 20 and 30 pound cylinders, and the cylinder’s requalification date must not have expired.

Propane generators still make carbon monoxide. See the safety guide and the placement guide.

Models that run on propane

Smaller dual fuel models:

Larger dual fuel models:

Our database has no portable generators that run on propane only. Home standby units that run on propane or natural gas are covered in the Generac and standby page.

What we could not verify

• “Cleaner burning” and emissions. We found no emissions figures in the manuals, so we make no comparison.
• Fuel cost and shelf life of propane. We have no sourced propane prices. Champion’s 100809 manual says ethanol gasoline can last up to a year with stabilizer, and that gasoline left in the carburetor can gum it up within 2 to 4 weeks. We did not read a propane shelf-life statement.
• Cold-weather performance. We have no sourced figures.
• Prices. Champion states none, so it shows “Not stated”.

Related guides

• Dual fuel generators compared
• Propane vs dual fuel
• Portable propane generators
• Generator comparison tool

Frequently asked questions