What these six publish, side by side
This is the table the category deserves, and the pattern in it is the whole buying decision: the four units that publish a coverage rating also publish both safety cutouts, and the two that publish neither cutout publish almost nothing else either.
| Heater | Output | Rated coverage | Run time | Weight | ODS + tip-over |
|---|
| Portable Buddy | 4,000 / 9,000 BTU/hr | 225 sq ft | 3 hr high, 6 hr low (1 lb) | 10.6 lb | Both published |
| Little Buddy | 3,800 BTU/hr | 95 sq ft | 5.6 hr (1 lb) | 5.85 lb | Both published |
| Hunting Buddy | 6,000 / 12,000 BTU/hr | 300 sq ft | Not published | 16 lb | Both published |
| Big Buddy (NF) | 4,000 / 9,000 / 18,000 BTU/hr | 450 sq ft | Up to 11 hr (dual 1 lb) | 17.1 lb | Both published |
| Comfort Gear 4,000 | 4,000 BTU/hr | Not published | Not published | Not published | Neither published |
| GasBRUH 6,200 | 6,200 BTU/hr | Not published | Not published | Not published | Neither published |
Every figure in the first four rows comes from Mr. Heater’s own product pages, which are linked in the sources at the foot of this page. The two off-brand rows are read from their Amazon listing titles, which is the only place either maker publishes anything. One more shared figure worth knowing: all four Mr. Heater units publish a maximum operating elevation of 7,000 feet. That is irrelevant in the whitetail timber most of this site is about and very relevant if you take one west.
The two cutouts, and what they actually do
An oxygen-depletion sensor— ODS on the spec sheets — is a pilot-flame arrangement that shuts the gas off when the oxygen concentration around the heater drops. It is not a carbon monoxide detector and it is not a substitute for one. What it does is catch the specific failure mode that kills people in enclosed spaces: a flame slowly consuming the air in a space too tight to replace it. If a heater is going inside a zipped blind, this is not a feature to shop around on.
A tip-over shutoff is a switch that cuts the gas when the unit is no longer upright. In a blind, with a chair, a bow, a pack and your boots all inside five feet of each other, this is the one that will actually get used. Anyone who has stood up fast at the sound of a deer knows exactly how a heater gets knocked over.
Four of the six units here publish both. The Comfort Gear and GasBRUH listings publish neither — we have recorded that as not published rather than assuming the hardware is absent, but on a flame you run beside your knee in a fabric box, an unpublished safety feature should be treated as absent until the maker says otherwise.
Carbon monoxide: the rules, in order
A ground blind is a tent, not a room, and the people who die of carbon monoxide poisoning in tents are not reckless — they are cold and they fall asleep. CPSC publishes that more than 200 Americans a year die from accidental non-fire CO poisoning tied to consumer products, and its standing advice for homes is a battery or battery-backup CO alarm on every level. A blind deserves the same hardware for about twenty dollars.
- Ventilate on two sides. One open window is a hole; two open windows on opposite walls are airflow. Crack a shoot-through window and a mesh panel.
- Put a CO alarm in the blind. Battery-powered, at about head height, where you will hear it. This is the single cheapest piece of safety equipment in this entire article.
- Never run a heater while you sleep. Not on a slow afternoon sit, not for ten minutes. The symptom list for CO poisoning starts with sleepiness, which is exactly the thing you cannot self-diagnose.
- Keep clearance on every side. The guard on a radiant heater gets hot enough to scorch fabric, a bowstring, a gun sling or a chair. Our blind chair picks are mostly fabric and mesh, which is worth remembering when you choose where the heater sits.
- Light it and shut it off outside the blind when you can. Ignition and shutdown are when a unit is most likely to release unburned gas.
None of that is a reason to skip a heater. It is the reason the page ranks a 3,800 BTU unit with two published cutouts above an 18,000 BTU unit for most hunters, and ranks a cheap outdoor heater last even though it works.
Radiant heat warms what it points at
Every heater on this page is a radiant unit, and radiant heat behaves differently from the forced-air heat you have in your house. It warms surfaces in its line of sight rather than circulating warm air around a space. In a blind that is mostly an advantage — you point it at your legs and your legs get warm in a minute — but it means the far corner stays cold and your back stays cold, which is the complaint people have about every one of these units.
The practical consequences, in order of how much they will annoy you:
- Aim it at your shins and feet, not your face. Feet are where cold wins a sit, and they are the easiest thing in the blind to point a radiant face at. Our cold-feet guide covers the rest of that problem, most of which is about boot fit rather than heat.
- A heater does not replace layers. It replaces the last layer. Dress as if the heater will fail, because a cylinder that runs out at 7 a.m. is a normal event — the CDC’s cold-stress guidance is about what your clothing does, not what your appliance does. Our layering system guide is the companion piece to this page.
- Propane output drops as a cylinder empties and chills. Published run times are laboratory figures. On a 15-degree morning expect less, and carry a spare 1 lb cylinder, which weighs about as much as the heat it contains.
Scent, noise and the things a heater costs you
Two honest trade-offs that no listing will mention.
Propane has a smell, and so do you after sitting over one. Combustion products and the odorant in LP gas are not woodland smells, and a heater running in a blind with two cracked windows is venting that downwind of you. A ground blind already contains your scent better than a tree stand does, which is most of its appeal; a heater pushes some of that back out. If you are running a full scent-control routine, understand that the heater is working against it, and site the blind with the wind doing the work rather than relying on the fabric.
Ignition is a noise and a light. A piezo igniter clicks, and a radiant face glows. Neither is loud or bright in absolute terms, and both happen at the worst possible moment if you light the heater after first light. Light it when you sit down, in the dark, before deer are moving.
Who should buy which, in one paragraph each
A two-person pop-up blind, morning and evening sits: Portable Buddy. Two settings, 6 hours published on the low one, 10.6 lb, both cutouts. This covers the large majority of deer hunters and it is also the cheapest of the four units that publish real figures.
A one-man blind, or a hunter who weighs every ounce: Little Buddy. At 5.85 lb it is the only heater here light enough that you stop deciding whether to bring it, 5.6 published hours covers a sit, and its 95 sq ft rating is the closest match on this page to a real blind. The single output setting is the trade.
A box blind or shooting house on cold ground: Hunting Buddy. 300 sq ft and a 6,000 BTU low setting means it still has a gentle mode in a space the Portable Buddy struggles to catch up with. Note that Mr. Heater publishes no run time for it, so cylinder planning is on you.
An all-day sit in an insulated two-person house, or double duty at camp: Big Buddy. Three settings, 450 sq ft, and up to 11 published hours on dual cylinders — the only all-day figure on this page. It is also 17.1 lb and the current build has no fan, so treat it as a vehicle-access heater.
Outdoors only: GasBRUH. 6,200 BTU for roughly a third of the next cheapest unit, described by its own maker as an outdoor cordless heater, with neither cutout published. Good at a tailgate or over a gutting pole. Not something we would zip into a blind.
How we picked, and what we did not do
We own none of these heaters and have not run any of them. Every figure on the four Mr. Heater rows was read from Mr. Heater’s own product pages on October 26, 2026, and the two off-brand rows from their live Amazon listings on the same date; anything a maker does not publish is recorded as not published rather than estimated. The ranking weights published safety hardware first, then whether the unit has a low setting, then run time and weight, and only then output — which is the reverse of how these products are marketed.
One disclosure worth making plainly. Four of these six picks are Mr. Heater. That is not a sponsorship and it is not laziness: Mr. Heater is the only maker in this category that publishes a BTU range, a coverage rating, a weight, a run time and both safety cutouts on a page you can read before you buy. A ranking built on published figures is going to reward the company that publishes figures. The two alternatives we included are there to show you what the rest of the category looks like, and what it declines to tell you.
What to buy with it
A heater is the last 10 percent of staying out until dark in December, and it is the wrong place to start. The blind comes first — see our ground blind picks— then a chair you can sit in for five hours, then clothing, then heat. If your late-season problem is specifically hands and core rather than ambient cold, a hand warmer or battery-heated layer solves it for less money and with no combustion at all, and our late-season gear guide puts the whole kit in order.
And if you would rather be twenty feet up a tree than in a box on the ground, the heater is off the table and the climb is the decision instead — our climbing stick picks cover that side of the same choice.
