Propane refill vs. exchange: what's the difference?
If you own a standard grill-style propane tank, you have two ways to get it filled again — and they are not the same product.
How exchange works
At an exchange cage (the steel cages outside grocery, hardware, and convenience stores), you hand over your tank — empty or not — and take a pre-filled replacement for one flat fee. It's fast and available almost everywhere. But there are three catches:
- You surrender your leftover propane. Most people exchange a tank that still has a gallon or two in it. That fuel goes with the tank, and you get no credit for it.
- Exchange tanks are usually filled to about 15 lb, not the full 20 lb a standard tank can safely hold — so you're buying less propane than the tank could carry.
- You lose your tank. If you bought a new, good-quality tank, you may get back an older one. And if your tank doesn't meet the exchange program's rules, they may refuse it.
How refill works
At a refill station, a trained attendant fills your tank while you wait, usually by the gallon:
- You keep your own tank — the one you picked, in the condition you keep it.
- You pay only for the gallons actually added. Bring a half-full tank to top it off before a trip, and you pay for the top-off, not a whole tank.
- Your tank gets filled to its proper capacity (80% full, which for a “20 lb” tank is about 4.6 gallons).
- Refill stations handle sizes an exchange cage can't — 30, 40, and 100 lb tanks, and built-in RV tanks, at the stations equipped for them.
So which should you choose?
Refill if you own a decent tank, have a refill station within a reasonable drive, or use larger tanks or an RV. Exchange if it's 9 p.m., the grill is cold, guests are waiting, and the cage is right there — convenience is a real thing, and there's no shame in paying for it. Just know that's what you're paying for.
One more honest note: if your tank is expired (tanks need recertification 12 years after their manufacture date), a refill station must refuse to fill it — and then exchanging it, where the program accepts it, or buying a new tank, becomes the practical move.