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A standard 20 lb propane tank lasts about 15 hours on a mid-sized gas grill, according to AmeriGas. That is an estimate, not a guarantee: the appliance’s fuel demand, heat setting, temperature, how often it runs and the amount of propane in the cylinder all affect runtime. For comparison, the Propane Education & Research Council (PERC) says a 20 lb tank can run a portable patio heater for up to 10 hours.
Typical runtime for common propane appliances
Runtime depends on what the appliance is and how it is operated. These figures are examples from U.S. consumer guidance, not promises for every model or condition.
| Appliance and fuel amount | Published runtime example | How to interpret it |
|---|---|---|
| Standard mid-sized gas grill, 20 lb tank | About 15 hours | AmeriGas’s estimate; temperature, grill size, energy demand and usage affect consumption. AmeriGas grill tank guidance |
| Portable patio heater, one 20 lb tank | Up to 10 hours | PERC’s general example; actual time varies by heater and setting. PERC patio heater guidance |
These examples should not be applied to generators, RV appliances or other equipment without checking their fuel inputs. An appliance that runs intermittently may use the same total operating hours over a longer calendar period than one used continuously.
Why the same tank can last different lengths of time
- Appliance demand: appliances consume propane at different rates. A higher fuel input generally means less operating time from the same fuel quantity.
- Heat setting and use: running at a high setting or operating for longer periods uses more fuel than lower or intermittent use.
- Temperature and conditions: AmeriGas identifies temperature, grill size, appliance energy demand and usage demand as factors in grill-tank consumption.
- Fuel actually in the cylinder: a tank’s familiar size label does not always tell you how much propane an exchanged cylinder contains.
Check the propane amount, not just the tank label
AmeriGas says its grill-tank exchange cylinders contain 15 lb net propane, although they are commonly called 20 lb tanks. That is less fuel than a full 20 lb load, so an exchange cylinder may provide less runtime than an estimate that assumes 20 lb of propane. Check the supplier’s stated net fill when comparing runtime expectations.
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- NEVER RUN OUT OF PROPANE: Our built-in gas meter gauge provides accurate gas level readings so you don’t have to worry about running out of propane!
- EMPTY TANK: Pre-purged vacuum ready for filling with propane; built from high-grade, welded steel and powder coated for rust prevention
- OVERFILL PREVENTION DEVICE: Comes with an OPD valve to prevent overfilling; required by law in most States, if your tank doesn't have this, most places won't fill it!
- SAFETY: X-ray and hydrostatic tested and DOT and Transport Canada certified so you can be sure to transport safely both in the US and CA
- SUIT YOUR NEEDS: With a standard-size connection valve, this large 30lb tank will connect as easily as smaller tanks, and work with RVs or trailers, propane tank attachable heaters, and other accessories.
Estimate runtime for your own appliance
- Find the appliance’s input rating. Check the appliance nameplate or the manufacturer’s catalog for its propane input in BTU per hour. PERC’s Technical Pocket Guide identifies those as the places to find appliance input when determining load.
- Confirm the fuel amount. Use the cylinder’s stated net propane quantity rather than assuming the label means it is filled with that many pounds of fuel.
- Account for how you operate it. Note the settings and approximate hours of actual operation. A single runtime figure cannot reflect every appliance, setting and use pattern.
- Use the result as a planning estimate. The available examples—about 15 hours for a mid-sized grill and up to 10 hours for a portable patio heater—are appliance-specific guidance, not a universal calculator.
A compatible fuel gauge can help monitor a small cylinder; AmeriGas mentions this approach in its RV refill guidance. Check that a gauge is suitable for your cylinder before relying on it.
Fuel runtime is not the cylinder’s service life
“How long does a tank last?” can also mean how long the cylinder remains eligible for use. That is separate from how many operating hours its propane supplies. PHMSA’s Is Your Propane Cylinder Safe? explains how to check manufacturing and requalification markings. Use the cylinder markings and ask a qualified propane retailer for date-specific service guidance; requirements can depend on the cylinder and applicable rules.
Rank #2
- Material: Plastic
- This lightweight, compact tank fits all standard portable propane appliances, tabletop grills and propane torches
- Country of Origin: USA
- Package Dimensions: 8" L x 8" W x 8" H
Portable propane cylinder safety
Storage and handling
- Keep portable cylinders outdoors. PERC says not to use or store them in enclosed spaces such as basements, garages, sheds or tents.
- Keep cylinders away from heat and ignition sources, and do not leave them in a vehicle.
- Do not repair or modify a cylinder yourself.
If you suspect a leak
- Do not smoke, vape or use an open flame. Avoid other ignition sources.
- If there is no flame or visible propane cloud at the cylinder, close the valve if you can do so safely, leave the area and call 911 or the fire department.
- Have a qualified professional inspect the cylinder and appliance before using them again.
These precautions follow PERC’s Safety Guide for Portable Propane Cylinders. If a flame or visible propane cloud is present, do not approach the cylinder to operate its valve.
Quick Recap
Best Value
- EMPTY TANK: Pre-purged vacuum ready for filling with propane; built from high-grade, welded steel and powder coated for rust prevention
- OVERFILL PREVENTION DEVICE: Comes with an OPD valve to prevent overfilling; required by law in most States, if your tank doesn't have this, most places won't fill it!
- SAFETY: X-ray and hydrostatic tested and DOT and Transport Canada certified so you can be sure to transport safely both in the US and CA
- SUIT YOUR NEEDS: With a standard-size connection valve, this large 40LB tank will connect as easily as smaller tanks, and work with RVs or trailers, propane tank attachable heaters, and other accessories.
- LEADING THE INDUSTRY: Flame King, a leader in propane storage solutions, prides itself on making the highest quality, premium, refillable propane tanks on the market. From 1lb up to 100lb tanks, we've got you covered
Rank #4
- High-grade steel-welded construction; premium OPD (overfilling protection device) valve assembly
- DOT approved, X-ray and hydrostatic tested
- Powder-coated for long-lasting exterior protection
- Widely used for storing and transporting propane gas; commonly utilized for grilling, camping, heating, and other outdoor activities
- Note: This propane tank is EMPTY and comes pre-purged and ready to be filled with gas
Rank #3
- Pre-filled 1-lb propane cylinder - 6 Pack
- Perfect for camping or outdoor activities
- Made of high-quality steel for durability
- Perfect for use with a propane stove, tabletop grill, propane torch, or any portable propane appliance
- Made in the US
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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