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Run time decides whether you pack three spare cylinders or bring one hose-connect kit for the weekend. Here is how long every model in the Buddy lineup runs, by heat setting and fuel source.
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Run Time by Model, Setting and Fuel Source
| Model | BTU Setting | Fuel Source | Approx. Run Time |
|---|---|---|---|
| Little Buddy | 3,800 (fixed) | 1 lb cylinder | ~5.5 hours |
| Portable Buddy | 4,000 (low) | 1 lb cylinder | ~5.4 hours |
| Portable Buddy | 9,000 (high) | 1 lb cylinder | ~2.4 hours |
| Portable Buddy | 9,000 (high) | 20 lb tank (hose-connect) | ~48 hours |
| Hunting Buddy | 12,000 (fixed) | 1 lb cylinder | ~1.8 hours |
| Buddy FLEX | 11,000 (fixed) | 1 lb cylinder | ~2 hours |
| Big Buddy | 4,000 (low) | 2× 1 lb cylinders | ~10.8 hours |
| Big Buddy | 18,000 (high) | 2× 1 lb cylinders | ~2.4 hours |
| Big Buddy | 18,000 (high) | 20 lb tank (hose-connect) | ~24 hours |
These figures use a standard conversion: roughly 21,600 BTU of usable energy per pound of propane. Real-world run time varies a bit with ambient temperature and cylinder condition. Treat these numbers as a reliable planning baseline, not an exact promise.
Why Run Time Drops So Fast at Higher Settings
Run time scales inversely with BTU output. Roughly double the BTU, roughly half the run time, on the same amount of fuel. That is why the Big Buddy at full 18,000 BTU burns through two 1 lb cylinders in a little over two hours. On its lowest 4,000 BTU setting, the same heater stretches that fuel to nearly 11 hours. Running on the lowest setting that keeps you comfortable is the single most effective way to extend a trip on limited fuel.
1 lb Cylinders vs. a Hose-Connected 20 lb Tank
A standard 20 lb tank holds roughly 20 times the fuel of one 1 lb disposable cylinder. The run-time math scales accordingly. A standard Buddy on high goes from under 2.5 hours on a single 1 lb cylinder to roughly 48 hours on a hose-connected 20 lb tank. For any trip longer than a single evening, a hose-connect kit pays for itself quickly compared to buying cylinders one at a time. See our hose and adapter guide for which kit fits which model.
Planning Fuel for a Multi-Day Trip
For a weekend trip without a hose-connect setup, work backward from the table above. A standard Buddy run for roughly 4 hours a night on high burns through close to two 1 lb cylinders per night. Pack accordingly, plus a spare. Car campers with room for a 20 lb tank and hose kit skip this math entirely. Backpackers prioritizing weight need to count cylinders carefully against trip length.
Does Cold Weather Affect Run Time?
Very cold temperatures can slightly reduce a cylinder’s effective output near the end of its fuel. Propane vaporizes less readily as both ambient and cylinder temperature drop. This effect is modest under normal winter camping conditions. It becomes more noticeable in genuinely extreme cold. Pack a small margin of extra fuel beyond the numbers above for cold-weather trips.
How to Tell How Much Fuel Is Left in a 1 lb Cylinder
Disposable 1 lb cylinders have no built-in gauge. This makes remaining fuel hard to judge precisely. Some owners partially submerge the cylinder in water as a rough check. The fuel level inside sits at a different temperature than the empty headspace above it. This is sometimes detectable by touch on the outside. It is only an approximation. Packing a spare cylinder is more reliable than trying to estimate exactly.
Refillable 20 lb Tanks Do Have Gauges
A hose-connected 20 lb or larger tank can use an inline pressure gauge. A simple weight check works too. A full 20 lb tank weighs about 37 to 38 lb including the empty cylinder’s own weight, usually stamped on the collar. Either method tracks remaining fuel far more precisely than guessing at a 1 lb cylinder’s contents.
Running Multiple Heaters Off One Tank
Some setups draw two heaters from the same larger tank through a manifold or splitter. A Big Buddy plus a smaller heater in a large wall tent is one example. This shortens total run time in proportion to the combined BTU draw. If you run more than one heater off a single 20 lb tank, divide the tank’s total capacity across the combined output. Do not treat each heater’s run time as independent.
Extending Run Time Without a Bigger Tank
Basic insulation helps beyond just running on a lower setting. A tent’s rainfly, a garage door’s weatherstripping, or simply blocking obvious drafts all reduce how much heat a space loses. Less heat loss means your fuel supply lasts longer at the same comfort level. This costs nothing beyond the insulation itself. It often makes a bigger practical difference than upgrading to a larger tank.
Packing Extra Fuel: A Simple Rule of Thumb
Calculate your expected run time from the table above, then add one extra 1 lb cylinder beyond that number for any trip away from easy resupply. A cold snap, an extra night, or a slightly higher setting than planned can all eat into your margin faster than expected. The cost of one spare cylinder is small next to the cost of running out of heat.
Quick Reference for Trip Planning
For an overnight trip on 1 lb cylinders, plan on roughly one cylinder per 2 to 5 hours of runtime, depending on model and setting. Always pack at least one spare beyond your calculated need. For anything longer, or for regular garage or workshop use, a hose-connect kit to a 20 lb or larger tank removes the guesswork and the need to carry multiple small cylinders at all.
Comparing Run Time to a Competing Heater
Run time figures are only useful next to a real comparison point. A Dyna-Glo Grab N Go at 10,000 BTU burns through a 20 lb tank in a little over 43 hours, close to the standard Buddy’s 48 hours on high, since the two sit at a similar output tier. This kind of side-by-side check is worth doing whenever you are comparing a Buddy model against an alternative brand, rather than judging run time in isolation.
Why Manufacturer Run-Time Claims Sometimes Differ
Some manufacturer literature quotes slightly different run-time figures than the math above, often because the stated BTU rating reflects an average across a burn cycle rather than a peak figure. Ambient temperature, altitude, and even how full a tank was at the start of a burn can shift real-world numbers by a small margin. Treat any run-time figure, including the ones in this guide, as a solid planning estimate rather than a lab-precise measurement.
Tracking Your Own Heater’s Real Run Time
The most reliable numbers come from your own heater in your own conditions. Note the time you start a fresh cylinder or tank and the time it runs dry at a given setting, and after a season of use you will have a more accurate personal baseline than any generic chart, including this one. This is especially useful if you consistently run your heater somewhere colder or higher in altitude than average.
Keeping a Simple Fuel Log
A short note in your phone, or a small notebook kept with the heater, is enough to build a useful record: the date, the setting used, and roughly how long the cylinder or tank lasted. Over a season or two, this turns into a genuinely useful personal reference that beats guessing every time you plan a trip.