Portable Buddy against Little Buddy: which BTU a shelter actually needs

The published figures, side by side

Both columns come from Mr. Heater’s own product pages, linked at the bottom. Where the manufacturer publishes a number without a unit, this table says so rather than guessing.

Which one, by shelter

A one-person flip-over. Little Buddy. 95 sq ft of published coverage against roughly 10 to 12 sq ft of actual floor is ample, and 5.6 hours on a cylinder beats carrying spares.

A two-person flip-over. Portable Buddy, on the low setting. You are buying the 6-hour published run time at 4,000 BTU and keeping 9,000 in reserve for the morning it is well below zero.

A three- or six-person hub. Portable Buddy, and expect to run it on high when the wind is up. A hub has far more fabric surface and far more air volume than a flip-over, and our shelters page covers why floor area in square feet is the figure to read rather than the person count.

No shelter at all. Neither, really. A radiant heater in open wind heats the side of you facing it and nothing else. Spend the money on a bib and suit first — that is the order our beginner gear page puts them in, and it is the right order.

The safety systems, and what they do not cover

Both heaters publish an oxygen depletion sensor and a tip-over shut-off, and both are listed as indoor safe. Those are real protections and they are the reason these two models dominate ice fishing.

An ODS shuts the heater off when the oxygen concentration around it drops far enough. What it is not is a carbon monoxide alarm — it responds to oxygen depletion, not to CO accumulation, and those are different measurements. Our shelters page already makes the point that a propane heater inside a sealed shelter produces carbon monoxide; the honest conclusion is that you want a vent open and, if you fish a sealed hub regularly, a battery CO alarm that costs less than a pack of jigs.

The tip-over switch is the one that matters on ice specifically, because the floor is slippery, uneven and shared with an auger. Both publish it.

Neither publishes a clearance distance on the pages we read, which is the figure you would actually want when you are deciding how far the heater sits from a nylon shelter wall.

Two published details worth knowing before you order

Massachusetts and Canada. Mr. Heater publishes both heaters as restricted in Massachusetts and in Canada, and sells a separate MA/Canada version of the Portable Buddy. If you fish either, check which version a listing is actually shipping before you buy.

7,000 feet. The published maximum elevation is 7,000 ft on both. That rules out a good deal of Rocky Mountain ice, where the ODS can shut the heater down because there genuinely is less oxygen, not because anything is wrong.

What the manufacturer does not publish cleanly

Three gaps, stated because this is a safety-adjacent purchase and the numbers should be better than this.

Run time contradicts itself. On the Portable Buddy page, the specification table says 3 hours at max and 6 at min while the description on the same page says “up to 5.4 hours”. We have published the table figures and flagged the difference rather than picking the flattering one.

Weight and dimensions have no units. Mr. Heater publishes 10.6 and 14.25 x 9 x 15 for the Portable Buddy and 5.85 and 12 x 9.75 for the Little Buddy, with no unit stated on either page. Pounds and inches are the obvious reading, and we are not going to assert it as published when it is not.

No burn rate on the Little Buddy. The Portable Buddy publishes gallons per hour at both settings. The Little Buddy publishes none, so you cannot do the propane arithmetic on it directly — only the 5.6-hour run time.