Wondering how much a 20-pound propane tank costs? You can typically refill one for $10 to $15 at places like Costco, which is often much cheaper than swapping it out for a new, pre-filled tank.

Opting for refills not only saves money but also helps you keep leftover gas instead of losing it during exchanges.

Keep reading to learn how to find the best deals near you and what safety checks to consider.

Should You Refill or Exchange Your Propane Tank?

Refilling your propane tank is almost always the better choice financially. You’ll pay around $3.00 to $4.00 per gallon for a refill, compared to $5.00 to $6.00 for an exchange. A refill also provides the full 20 pounds of propane, whereas exchanges often shortchange you by about 5 pounds. This means you get up to 33% more fuel for less money. For comparison, using a portable generator with a high-efficiency inverter can maximize fuel economy and further reduce your overall costs. To protect your setup from the elements, consider using waterproof cord covers for your generator’s extension cables.

However, safety is key. Only refill your tank if it passes inspection and meets all certification requirements. If your tank is outdated or damaged, an exchange is the safer, more practical option. Exchanges accept older cylinders that you legally can’t refill, though you’ll lose any leftover propane in the process. For regular grillers who prioritize value, refilling is usually the better choice—just ensure your tank is in good condition and safe to refill. If you need to dispose of old gas from a generator, safe disposal methods involve taking it to a hazardous waste facility or using fuel stabilizers.

Where to Get the Cheapest 20 Lb Propane Tank Refill

Warehouse clubs like Costco and BJ’s Wholesale typically offer the cheapest 20 lb propane tank refills, usually costing between $10 and $15 for members. Tractor Supply often charges around $13 to $16, while U-Haul prices range from $14 to $19 without requiring a membership. In rural areas, local propane dealers can sometimes beat these prices—call ahead to check current rates. If you are powering a home appliance, note that inverter generators are generally more fuel-efficient and quieter than traditional models, potentially reducing your overall propane costs over time. For truckers running appliances off propane, selecting a unit with high continuous wattage ensures reliable operation of sensitive electronics. Always ensure your tank is safe before refilling. Look for dents, rust, or expired recertification dates. Stick to standard 20 lb tanks, as unusual sizes may have a higher per-gallon cost. To get the best deal, compare prices per gallon and avoid additional convenience fees. Refill stations generally offer better prices than retail exchange services, especially if you bring your own tank. For those seeking a more integrated solar solution, top hybrid solar inverters can help maximize energy savings when paired with propane backup systems.