The Complete Guide to Portable Propane Tank Sizes: From Backyard Grills to Job Sites

A practical guide from your local propane experts at Greco Gas

Walk into any big-box store and you'll see one size of propane tank: the ubiquitous 20-pounder sitting by the entrance. But here's what they won't tell you—that standard grill tank isn't always the right answer. In fact, for many applications, it's the most expensive and least convenient option.

After many years supplying residential propane across Southwestern Pennsylvania, we've learned that most people don't have a propane problem—they have an information problem. So, let's fix that.

Understanding the Basics: What Those Pound Numbers Actually Mean

First, a quick clarification that trips up everyone: a "20 lb tank" doesn't weigh 20 pounds. It holds 20 pounds of propane. The empty tank itself weighs about 17 pounds, so when full, you're carrying around 37 pounds. This matters more than you'd think when you're lugging one across a job site or up to a roof deck.

Now, let's walk through your options.

The 20 lb Tank: America's Default (For Better or Worse)

Common Uses: Gas grills, portable heaters, small camping stoves, mosquito traps

What You Should Know: This is the most widely available size, which is both its greatest strength and its hidden weakness. Yes, you can exchange it at thousands of locations. But here's what that convenience costs you: most tank exchange programs give you 15 pounds of propane, not 20. You're paying full price for 75% of the fuel. (We fill to the proper 20 lbs at all our locations—call it radical transparency.)

Typical Burn Times:

• Standard gas grill: 18-20 hours of cooking time
• 30,000 BTU patio heater: 10-12 hours on high

The Hidden Truth: If you're using propane regularly—running a food truck, heating a workshop, or grilling more than once a month—the 20 lb tank is costing you money. The cost per pound increases every time you drive to refill it, and the smaller capacity means more frequent trips.

Best For: Casual grillers, occasional users, situations where portability trumps all other concerns.

The 30 lb Tank: The Forgotten Middle Child

Common Uses: RVs, larger portable heaters, commercial food vendors, construction site heaters

What You Should Know: This size is surprisingly hard to find at consumer locations, which is a shame because it's the sweet spot for many applications. It gives you 50% more runtime than a 20-pounder without a huge increase in weight or footprint.

Typical Burn Times:

• RV furnace and appliances: 2-4 days of normal use
• 60,000 BTU construction heater: 10-12 hours on high
• Food truck griddle: 12-15 hours of continuous operation

The Math That Matters: If you're currently running through a 20 lb tank every week or two, a 30 lb tank will save you roughly one refill trip per month. Over a season, that adds up to more than just fuel costs—it's your time and hassle.

Best For: Regular users who need portability but are tired of constant refills.

The 60 lb Tank: Bridging Portable and Stationary

Common Uses: Large temporary heating, mobile catering operations, remote construction sites, agricultural applications

What You Should Know: At 60 pounds of fuel (plus tank weight), you're approaching the limit of what one person should be moving around regularly. These tanks are popular for applications that sit in one spot for days or weeks but still need to be transportable.

Typical Burn Times:

• 200,000 BTU temporary heater: 6-8 hours
• Agricultural heating/drying operations: 12-24 hours depending on BTU demand
• Large commercial kitchen setup: 2-4 days of steady use

The Transportation Question: This is the size where you really need to think about how you're moving it. A 60 lb tank full weighs close to 110 pounds. One person can probably do it, but two people should do it. A hand truck becomes mandatory, not optional.

Best For: Semi-permanent installations, large temporary heating needs, operations where weekly refills make sense.

The 100 lb Tank: Maximum Portability

Common Uses: Remote construction sites, large-scale temporary heating, mobile industrial operations, agricultural applications, events and festivals

What You Should Know: This is as big as portable gets before you're into permanent installation territory. A full 100 lb cylinder weighs about 170 pounds—you're not casually moving this around. But for remote locations or applications where you need a week or two of runtime without a refill, this is your answer.

Typical Burn Times:

• 400,000 BTU construction heater: 5-7 hours on high
• Industrial drying operation: 24-48 hours depending on BTU load
• Remote job site with multiple applications: 3-7 days

The Logistics Reality: At this size, delivery and pickup services start making sense. The cost of transporting a 100 lb tank yourself (vehicle wear, time, handling risk) often exceeds the delivery fee. Plus, most operations using 100 lb tanks need them regularly enough that scheduled service is more efficient.

Best For: Remote operations, large temporary projects, agricultural operations, situations where minimizing refill frequency is critical.

The Questions You Should Ask (That Most Suppliers Hope You Won't)

1. "How much propane am I actually getting?" Tank exchanges often short-fill. A proper fill gives you the rated capacity. At Greco Gas, we fill by weight to the proper amount, every time. 
2. "What's my cost per pound of propane, including my time?" As an example, a 20 lb tank that costs $20 to fill is $1/lb. But if you're refilling twice as often as you'd need with a 40 lb tank, your real cost includes the value of your time and vehicle expenses. For regular users, larger tanks almost always win this calculation.
3. "What's my realistic usage pattern?" This is the question that matters most. A food truck running six days a week has different needs than a homeowner grilling on weekends. Be honest about your usage, and the right size becomes obvious.
4. "Can I exchange this tank anywhere?" The 20 lb tank dominates because of exchange ubiquity. But if you use propane regularly enough to justify a larger tank, you should have a supplier relationship, not a transactional exchange habit. We can re-certify and do a visual test  on tanks, and also help you optimize sizing for your actual needs.

The Real Cost of Choosing Wrong

Here's something we see constantly: a contractor buys three 20 lb tanks and rotates them because "they're easier to find." Over a season, he makes 45 trips to refill versus the 15 trips he'd make with 60 lb tanks. At approximately 20 minutes per trip and $0.67/mile for vehicle costs, he's spent roughly $500 in time and transportation to save the $100 he would have spent on properly sized tanks.

The math gets even worse for commercial operations. A food truck using 20 lb tanks versus a 60 lb tank isn't just paying for convenience—they're paying a premium that compounds with every refill.

How to Actually Choose the Right Size

Forget what you currently use. Instead, answer these three questions:

1. How often do I currently refill? More than twice a month? You're undersized.
2. Is portability an actual requirement or just a habit? Many people lug portable tanks around for applications that could use stationary service. We've installed permanent tanks in workshops, commercial kitchens, and job sites where people were convinced they needed portable. The labor savings alone usually pays for installation in months. Contact us to discuss bulk propane solutions.
3. What's my longest period between access to refills? If you're on a remote job site for two weeks, your tank size isn't optional—it's determined by BTU consumption and duration.

Why This Matters (The Part Most Suppliers Skip)

The propane industry makes more money when you use the wrong size tank. Frequent refills, exchange fees, and undersized cylinders create recurring revenue. A customer using three 20 lb tanks generates more transactions than one using a properly sized 60 lb tank.

We'd rather you use propane efficiently and recommend us to others than maximize transaction count. Over the years, that approach has worked pretty well for Greco Gas.

What We Actually Recommend

For our Southwestern Pennsylvania & Pittsburgh area customers, here's what we typically see work:

• Casual grill users: 20 lb tank, filled to proper weight (not exchanged)
• Regular grillers or patio heater users: 30 lb tank, eliminates 60% of your refill trips
• Food trucks, mobile vendors: 60 lb tank minimum, often dual-tank setup for safety
• Construction sites, temporary heat: 100 lb tank or convert to bulk service with permanent tank
• Commercial kitchens, forklifts: 40 lb with scheduled exchange service

Want to know what makes sense for your situation? Stop by any of our locations in Tarentum, Butler, or Kittanning. Bring your consumption estimates if you have them (most people don't, and that's fine). We'll help you figure out the right size based on actual usage, not what's most convenient for us to sell you.

Because here's the thing about being in business for 80+ years in the same communities: we'll see you again. We'd rather get it right the first time.

Greco Gas has been supplying propane and industrial gases to Southwestern Pennsylvania for many decades. Visit us in Tarentum, Butler, or Kittanning, or call us to discuss your propane needs. We fill all standard propane cylinder sizes and provide delivery service to businesses throughout the region.