Coal & Char

Best Portable Propane Heaters

Garage, shop, tent, RV and job site — propane heaters from 3,800 to 80,000 BTU, ranked on what they actually heat and where each one is safe to run.

By Stephen V.Last updated How we pick

Buy the Mr. Heater Big Buddy. At 18,000 BTU it is the portable propane heater that covers the most situations — a two-car garage, a workshop, a large tent, an RV at a cold campsite — without being so big it is dangerous indoors or so small it is pointless. It is the default, and the rest of this page is about the cases where something else is the right answer.

Those cases are mostly about size in both directions. If you are heating one person in a tent or a truck cab, the Little Buddy at 3,800 BTU is cheaper to buy and far cheaper to run, and anything bigger is wasted. If you are heating an open shop, a barn or a big canvas tent and want the whole volume warm rather than one bench, the Dura Heat LPC80is a convection heater with an adjustable 50,000 to 80,000 BTU range — a completely different tool. And if what you want is maximum heat per dollar outdoors and you do not care what it looks like, the 45,000 BTU tank-top heater screws straight onto a 20 lb tank and costs less than a tank of gas to buy.

Before any of that, the part that is not negotiable. Every heater on this page burns fuel, and burning fuel in an enclosed space produces carbon monoxide. The US Consumer Product Safety Commission reports that more than 200 people in the United States die every year from accidental non-fire carbon monoxide poisoning associated with consumer products, and its standing recommendation is a CO alarm on every level of the home and outside sleeping areas. For a garage, shop, tent or RV that means: ventilation, a working carbon monoxide alarm in the space with you, and never, ever a combustion heater running while you sleep in a sealed space. A “safe propane heater for indoors” means low-oxygen-shutoff equipped and ventilated — not sealed in.

Two specific jobs these heaters get asked to do.In a greenhouse the ventilation and humidity questions come before the heater choice — see using a propane heater in a greenhouse. And if you want to know what you are really buying, how long propane heaters last covers run time per tank and the service life of the appliance, which are two different questions in the same words.

How this is funded:we earn a commission if you buy through our links, at no extra cost to you. It never changes which pit or heater we recommend, and we’ll tell you when we’d skip one. Full disclosure.

Quick picks

Ranked on published specs, beginner-friendliness and value. Select a row to jump to the full write-up. We haven’t cooked on every one of these — here is exactly what we do instead.

#ProductBest forPrice
1
Mr. Heater 18,000 BTU Big Buddy Heater

Mr. Heater 18,000 BTU Big Buddy Heater

Double the Portable Buddy's output and the ability to run two 1 lb cylinders at once, which turns a two-hour heater into an all-evening one. It is the right size for a garage, a workshop, a large tent or a covered porch — still not an open patio. The same caveats apply and apply harder at 18,000 BTU: combustion heater, enclosed space, carbon monoxide alarm, every single time.

Best overall
2
Mr. Heater 9,000 BTU Portable Buddy Radiant Propane Heater

Mr. Heater 9,000 BTU Portable Buddy Radiant Propane Heater

The Portable Buddy is the one radiant propane heater almost everyone in cold-weather outdoor hobbies already owns, and it runs on a 1 lb cylinder rather than a 20 lb tank — which is what makes it portable in the real sense. Nine thousand BTU is small next to a patio heater but enormous inside a tent, an ice shanty or a blind. Mr. Heater builds in a tip-over switch and an oxygen depletion sensor. Use a carbon monoxide alarm with it anyway, every time.

Best for a single-car garage
$89.99 · View on Amazon

Price as of October 27, 2026. #ad How we’re funded

3
Mr. Heater 3,800 BTU Little Buddy Portable Radiant Propane Heater

Mr. Heater 3,800 BTU Little Buddy Portable Radiant Propane Heater

The smallest heater worth owning and the cheapest way to make a tent, a truck cab or a small shed survivable. It runs off a 1 lb camping cylinder that screws straight into the base, so there is no hose, no regulator and nothing to set up. At 3,800 BTU it will not heat a garage — it heats the person sitting next to it — and because it is a combustion heater it needs ventilation and a working carbon monoxide alarm in any enclosed space, which is a rule and not a suggestion.

Best for a tent or truck cab
$69.99 · View on Amazon

Price as of October 27, 2026. #ad How we’re funded

4
Dura Heat LPC80 50,000-80,000 BTU Propane Convection Heater

Dura Heat LPC80 50,000-80,000 BTU Propane Convection Heater

A convection heater rather than a radiant one, which is the distinction that decides whether this is the right buy. Radiant heaters warm what they point at; this one warms the air in a 360-degree column and lets it circulate, so it is the better answer for an open garage, a barn or a large tent where you want the whole volume warmer rather than one bench. The listing states an adjustable 50,000 to 80,000 BTU range. It is a lot of combustion in one place — ventilation and a CO alarm are not optional.

Best for a whole shop or barn
$136.37 · View on Amazon

Price as of October 27, 2026. #ad How we’re funded

5
Mr. Heater Original 540-Degree 45,000 BTU Tank Top Radiant Propane Heater

Mr. Heater Original 540-Degree 45,000 BTU Tank Top Radiant Propane Heater

The most heat per dollar on this page by a long way: 45,000 BTU for the price of a small radiant heater, because it has no cabinet, no wheels and no base — it screws onto the top of a standard 20 lb propane tank and the tank is the stand. The listing's 540-degree figure is the radiating arc. This is outdoor and well-ventilated-space equipment only: it is a big open flame at waist height with no enclosure, which is exactly why it is cheap and exactly why it does not belong in a closed garage.

Most heat per dollar outdoors
$77.99 · View on Amazon

$119.9935% off

Price as of October 27, 2026. #ad How we’re funded

The picks in full

#1Best overall

Mr. Heater 18,000 BTU Big Buddy Heater

Double the Portable Buddy's output and the ability to run two 1 lb cylinders at once, which turns a two-hour heater into an all-evening one. It is the right size for a garage, a workshop, a large tent or a covered porch — still not an open patio. The same caveats apply and apply harder at 18,000 BTU: combustion heater, enclosed space, carbon monoxide alarm, every single time.

What’s good

  • 18,000 BTU covers a garage or a large tent properly
  • Runs two 1 lb cylinders, or a 20 lb tank with the right hose
  • Variable output rather than one fixed setting
  • Same proven Mr. Heater safety features

Trade-offs

  • Still a combustion heater — a CO alarm is mandatory, not optional
  • Hose and filter for a 20 lb tank are extra
  • Heavy and bulky next to the Portable Buddy
  • Not a substitute for a patio heater in open air
TypePortable radiant propane heater
Heat output18,000 BTU (per the listing)
FuelTwo 1 lb cylinders, or 20 lb tank with a hose (hose not included)
ModelBig Buddy

Specs read from the product listing, on October 7, 2026. “Not published” means the maker doesn’t state that figure there.

#2Best for a single-car garage

Mr. Heater 9,000 BTU Portable Buddy Radiant Propane Heater

The Portable Buddy is the one radiant propane heater almost everyone in cold-weather outdoor hobbies already owns, and it runs on a 1 lb cylinder rather than a 20 lb tank — which is what makes it portable in the real sense. Nine thousand BTU is small next to a patio heater but enormous inside a tent, an ice shanty or a blind. Mr. Heater builds in a tip-over switch and an oxygen depletion sensor. Use a carbon monoxide alarm with it anyway, every time.

What’s good

  • Runs on a 1 lb cylinder — genuinely carryable
  • Tip-over shutoff and oxygen depletion sensor built in
  • 9,000 BTU is a lot of heat in a small enclosed space
  • The long-standing default in cold-weather outdoor hobbies

Trade-offs

  • Far too small to warm an open patio
  • 1 lb cylinders are expensive per hour of heat
  • Still a combustion heater: use a CO alarm, always
  • Not rated for use in every enclosed space — read the manual
TypePortable radiant propane heater
Heat output9,000 BTU (per the listing)
Fuel1 lb propane cylinder
SafetyTip-over switch and oxygen depletion sensor, per the maker
SeriesMidnight Series

Specs read from the product listing, on October 7, 2026. “Not published” means the maker doesn’t state that figure there.

#3Best for a tent or truck cab

Mr. Heater 3,800 BTU Little Buddy Portable Radiant Propane Heater

The smallest heater worth owning and the cheapest way to make a tent, a truck cab or a small shed survivable. It runs off a 1 lb camping cylinder that screws straight into the base, so there is no hose, no regulator and nothing to set up. At 3,800 BTU it will not heat a garage — it heats the person sitting next to it — and because it is a combustion heater it needs ventilation and a working carbon monoxide alarm in any enclosed space, which is a rule and not a suggestion.

What’s good

  • 3,800 BTU is enough for a tent or a one-person work space
  • Screws onto a 1 lb cylinder — no hose, no regulator, nothing to rig
  • Smallest and cheapest heater in the Buddy range
  • Tips over and it shuts off

Trade-offs

  • 3,800 BTU will not heat a garage or a shop
  • 1 lb cylinders are expensive fuel per hour
  • Needs ventilation and a CO alarm in any enclosed space
  • No thermostat — it is on or off
TypePortable radiant propane heater
Output3,800 BTU (per the listing)
Fuel1 lb propane cylinder
Indoor useNot published
Safety shutoffTip-over shutoff, per the listing

Specs read from the product listing, on October 13, 2026. “Not published” means the maker doesn’t state that figure there.

#4Best for a whole shop or barn

Dura Heat LPC80 50,000-80,000 BTU Propane Convection Heater

A convection heater rather than a radiant one, which is the distinction that decides whether this is the right buy. Radiant heaters warm what they point at; this one warms the air in a 360-degree column and lets it circulate, so it is the better answer for an open garage, a barn or a large tent where you want the whole volume warmer rather than one bench. The listing states an adjustable 50,000 to 80,000 BTU range. It is a lot of combustion in one place — ventilation and a CO alarm are not optional.

What’s good

  • Adjustable 50,000-80,000 BTU per the listing — real range, not one setting
  • Convection heats the air all round, not just what it faces
  • Runs off a standard 20 lb tank
  • Cheaper per BTU than any cabinet patio heater

Trade-offs

  • Needs serious ventilation and a CO alarm
  • Tall, open-flame tower — not a heater to put near anything
  • No thermostat control
  • Overkill, and wasteful, for a patio or a single person
TypePortable propane convection heater
Output50,000-80,000 BTU, adjustable (per the listing)
Fuel20 lb propane tank
Heat patternConvection (360 degrees)
Indoor useNot published

Specs read from the product listing, on October 13, 2026. “Not published” means the maker doesn’t state that figure there.

#5Most heat per dollar outdoors

Mr. Heater Original 540-Degree 45,000 BTU Tank Top Radiant Propane Heater

The most heat per dollar on this page by a long way: 45,000 BTU for the price of a small radiant heater, because it has no cabinet, no wheels and no base — it screws onto the top of a standard 20 lb propane tank and the tank is the stand. The listing's 540-degree figure is the radiating arc. This is outdoor and well-ventilated-space equipment only: it is a big open flame at waist height with no enclosure, which is exactly why it is cheap and exactly why it does not belong in a closed garage.

What’s good

  • 45,000 BTU for well under the price of a cabinet heater
  • Mounts straight onto a 20 lb tank — no stand to buy or store
  • 540-degree radiating arc, per the listing
  • Almost nothing on it to break

Trade-offs

  • Open flame at waist height — outdoor and ventilated spaces only
  • No enclosure, no wheels, no tip-over base
  • Puts the heat high and wide, not at a seated person
  • Empties a 20 lb tank fast at full output
TypeTank-top radiant propane heater
Output45,000 BTU (per the listing)
Radiating arc540 degrees (per the listing)
MountingScrews onto a 20 lb propane tank
Indoor useNot published

Specs read from the product listing, on October 13, 2026. “Not published” means the maker doesn’t state that figure there.

How much propane heater do you actually need?

BTU figures are easy to over-buy. The useful way to think about it is what you are trying to warm — a person, a work area, or a volume of air.

  • 3,800 BTU: one person. A tent, a truck cab, a small shed, an ice shack. The Little Buddy.
  • 9,000 BTU: a work area or a single-car garage with the door down. The Portable Buddy.
  • 18,000 BTU: a two-car garage, a workshop, a large tent, an RV. The Big Buddy. This is the size most people need.
  • 45,000 BTU and up: outdoor job sites, open bays, barns. Not a heater for a closed space.
  • 50,000-80,000 BTU convection: warming the whole volume of a large open building. The Dura Heat.

The other axis is radiant against convection, and it matters more than the BTU number. A radiant heater — every Buddy heater, and the tank-top — warms whatever it is pointed at, the way the sun does. Stand in front of it and you are warm instantly; walk ten feet away and you are cold. A convection heater warms the air and lets it circulate, so the whole room comes up slowly and stays up. For working at a bench, radiant wins. For making a barn habitable, convection wins.

Fuel: 1 lb cylinders or a 20 lb tank?

This is where the running cost hides. A 1 lb camping cylinder is convenient and screws straight on, and it is dramatically more expensive per hour of heat than the same propane out of a 20 lb barbecue tank. On a Little Buddy used a few nights a year, nobody cares. On a Big Buddy running most of a winter in a garage, the difference is real money.

The Big Buddy and the Portable Buddy both accept a hose and regulator to a 20 lb tank, which is the configuration to use for anything beyond occasional use. The tank-top heater and the Dura Heat only run from a 20 lb tank — there is no cylinder option, which is part of why they are cheap to run.

The safety rules, stated plainly

These are not disclaimers, they are the operating instructions for this whole category.

  • Ventilate. A propane heater consumes oxygen and produces carbon monoxide and water vapor. A cracked window or a partially open garage door is the minimum, in every enclosed space, at every output.
  • Fit a carbon monoxide alarm in the space you are heating, and check it. The CPSC recommendation is battery-operated or battery-backup alarms on every level and outside sleeping areas.
  • Never run a combustion heater while you sleep in a tent, RV or sealed room. This is the scenario that kills people.
  • Check the indoor rating on the listing itself, not on a forum. Where a listing does not state indoor use, our product tables say “Not published” — which means treat it as outdoor equipment.
  • Keep clearances. A radiant heater pointed at a tarp, a sleeping bag or a stack of cardboard is a fire. The tank-top heater in particular is an open flame at waist height with no enclosure.

When propane is the wrong fuel

If the space has mains power and you do not need portability, an electric infrared heater produces no combustion products at all, which removes this entire safety conversation — and for a covered porch, a garage with a socket or a balcony, it is usually the better answer. Our propane vs electric comparison works through where each one wins. If you are weighing propane against kerosene for a shop, we compare those two directly in propane vs kerosene heaters. And if what you want is warmth on an open patio rather than inside a building, a freestanding patio heater puts the heat where seated people are.

Four pages go deeper on the specific situations this field is bought for. Is a propane heater safe indoors? is the safety checklist; propane heaters for camping and propane heaters for RVs size the same heaters to a tent and a camper; and propane garage heaters adds the vent-free and forced-air options a garage can take because you can open the door.

Frequently asked questions

What is the best propane heater?

The Mr. Heater Big Buddy at 18,000 BTU for most people — it covers a two-car garage, a workshop, a large tent or an RV, and it will run from either 1 lb cylinders or a 20 lb tank with a hose. Drop to the 3,800 BTU Little Buddy if you are heating one person in a tent or cab, and step up to a 50,000-80,000 BTU convection heater if you need a whole barn or open shop warm.

Is a propane heater safe to use indoors?

Only with ventilation and a working carbon monoxide alarm, and never while you are asleep in a sealed space. Propane heaters consume oxygen and produce carbon monoxide; the CPSC reports more than 200 accidental non-fire CO deaths a year in the US from consumer products and recommends CO alarms on every level of a home and outside sleeping areas. Check indoor use on the listing itself — where a listing does not state it, treat the heater as outdoor equipment.

What size propane heater do I need for a garage?

9,000 BTU handles a single-car garage with the door down; 18,000 BTU is the right size for a two-car garage or a workshop. Above that you are into open-bay and barn territory, where a 50,000-80,000 BTU convection heater warms the whole volume instead of one work area. Bigger is not better in an enclosed space — it just consumes more oxygen.

How long does a 1 lb propane cylinder last?

It depends entirely on output, and runtime is not the real issue — cost is. A 1 lb camping cylinder is dramatically more expensive per hour of heat than the same propane from a 20 lb barbecue tank. For occasional use the convenience wins; for a whole winter in a garage, run a hose to a 20 lb tank instead.

What is the difference between a radiant and a convection propane heater?

A radiant heater warms whatever it points at, like the sun — instant warmth in front of it, nothing ten feet away. A convection heater warms the air and lets it circulate, so a whole space comes up slowly and stays up. Radiant is right for working at a bench or sitting in a tent; convection is right for making a barn or open shop habitable.

Can I use a propane heater in a tent?

With ventilation, a carbon monoxide alarm inside the tent, generous clearance from fabric and sleeping bags, and never while anyone is asleep. The 3,800 BTU Little Buddy is the size that suits a tent. If you want heat you can leave running overnight in a tent, the honest answer is a wood-burning tent stove with a proper flue through a stove jack, not a propane heater.

Sources

  • CPSC — Carbon Monoxide Information Center — The US Consumer Product Safety Commission on carbon monoxide: “More than 200 people in the United States die every year from accidental non-fire related CO poisoning associated with consumer products,” and its standing recommendation to “Install battery-operated CO alarms or CO alarms with battery backup on every level of the home and outside sleeping areas” (accessed October 7, 2026)
  • FTC Consumer Advice — Online Shopping — FTC guidance for buying online: “before you buy something online, shop around and check out sellers and products,” note the exact manufacturer or model number when comparison shopping, and pay by credit card so a bad order can be disputed (accessed October 7, 2026)

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