5 Best Indoor-Safe Propane Heaters for an Outage

PowerOutage.us tracks more than 950 utilities covering 96% of U.S. electricity customers, so we see how long winter storm outages actually last. We ranked these heaters against that data, so you buy one that outlasts the cold instead of just the first night.

How we ranked these indoor-safe propane heaters

We ranked these heaters for one job: keeping a room warm when the power is out and the furnace is dead. We combined manufacturer specs, aggregated owner reviews, and our own outage-duration data to weigh each pick.

Here is what mattered most, in order:

1. Indoor safety. This carried the heaviest weight. Indoor propane heaters use an oxygen-depletion sensor (ODS) that shuts the heater off if oxygen levels fall too low. That said, an ODS is not a carbon monoxide detector, which is why a working CO alarm is still essential.
2. Heat output matched to room size. We compared BTU output against rated coverage, since an undersized heater never catches up in a cold room and an oversized one burns fuel you can’t resupply mid-outage.
3. Runtime per cylinder. A 1 lb cylinder is the unit of planning during an outage. We favored heaters that stretch a cylinder or accept a 20 lb tank for multi-day coverage.
4. No-power ignition. A heater that needs grid power to light is useless in an outage. We checked that each one lights by piezo or battery, not a wall plug.
5. Owner reports. Since we did not test these, we leaned on aggregated reviews for real-world reliability, and we note where owners flag a weak spot in the cons.

5 Best indoor-safe propane heaters

These five cover the range of outage heating needs, from a single cold bedroom to an open living room over a multi-day winter outage. Each one is rated for indoor use with an oxygen-depletion sensor.

The Portable Buddy fits the most situations because 9,000 BTU covers a typical bedroom, office, or living room, and the heater runs off the same 1 lb cylinders sold at any hardware store. Homeowners who want one safe, all-around heater and would rather not overthink the choice should reach for the MH9BX.

• Heat output: 9,000 BTU max, 4,000 BTU low
• Coverage: up to 225 sq ft
• Safety: oxygen-depletion sensor plus tip-over auto shut-off
• Fuel and runtime: 1 lb cylinder, or a 20 lb tank with a hose; about 3 to 6 hours per cylinder
• Price: About $80 to $110

Mr. Heater MH9BX reviews

Owners on Amazon rate it around 4.8 stars and call it safe, efficient, and powerful for its size. The most common complaint is labeling confusion on the Massachusetts and Canada version, which is not indoor-approved.

Should you buy the Mr. Heater MH9BX Portable Buddy?

Buy the Portable Buddy if you want one safe, proven heater that warms a normal-sized room and runs off cheap cylinders. Pass on it only if your space is larger than 225 sq ft, where the Big Buddy moves more heat.

The Big Buddy is built for people heating an open living room, finished basement, or a drafty 400-plus sq ft space where a smaller heater doesn’t cut it. Owners who would rather connect a 20 lb tank and ride out a multi-day outage than swap small cylinders all night should choose the MH18B.

• Heat output: 4,000 / 9,000 / 18,000 BTU selectable
• Coverage: up to 450 sq ft
• Safety: oxygen-depletion sensor plus tip-over auto shut-off
• Fuel and runtime: one or two 1 lb cylinders, or a 20 lb tank via hose, for long multi-day runtime
• Price: Around $150 to $200

Mr. Heater Big Buddy reviews

Owners rate it around 4.7 stars and praise the output and runtime in big or drafty spaces. The recurring note is that the battery fan has been dropped from some recent production batches.

Should you buy the Mr. Heater Big Buddy MH18B?

Buy the Big Buddy if you need to keep an open floor plan or a large room warm through a multi-day outage. Pass on it if you only heat one small room, where the cheaper Portable Buddy or Little Buddy is plenty.

The Little Buddy suits anyone who only needs to hold one small room, tent, or cabin above freezing for the least money. The MH4B is the pick for a single sleeper or a spare heater you stash in a closet and forget until the power drops.

• Heat output: 3,800 BTU fixed
• Coverage: up to 95 sq ft
• Safety: oxygen-depletion sensor plus tip-over auto shut-off
• Fuel and runtime: 1 lb cylinder only; about 5 to 6 hours per cylinder
• Price: About $50 to $70

Mr. Heater Little Buddy reviews

Owners rate it around 4.5 stars and like the low running cost and simple, safe operation. Common complaints are weak heat in larger rooms and a harmless rolling sound in the box that worries new buyers.

Should you buy the Mr. Heater Little Buddy MH4B?

Buy the Little Buddy if you want a dead-simple heater for a bedroom, tent, or cabin at the lowest price. Pass on it if you need to warm a living room or run off a big tank, where the Portable Buddy or Big Buddy fit better.

The DXH12B is for people who want to push a button and walk away, since the heater's fan spreads warmth and three USB ports charge phones during the outage. DEWALT 20 V tool owners get the most from the DXH12B, because the same batteries that run their drills power its ignition and fan.

• Heat output: 6,000 or 12,000 BTU options
• Coverage: up to 300 sq ft
• Safety: low-oxygen (ODS) plus tip-over auto shut-off
• Extras: battery electronic ignition, high-speed fan, LED work light, 3 USB charging ports
• Fuel and runtime: dual 1 lb cylinders, up to 7 hours on low and 3.5 hours on high
• Price: Around $180 to $250

DEWALT DXH12B reviews

Owners like the fast push-button heat, the fan, and charging phones off the USB ports during outages. Complaints center on the loud single-speed fan, flimsy access doors, and a few units arriving faulty.

Should you buy the DEWALT DXH12B?

Buy the DXH12B if you want no-match ignition, faster heat from a fan, and a way to charge devices off the same unit. Pass on it if you want silence, since the fan is loud and runs at one speed.

The Olympian Wave 6 is the pick for if you want to heat a family area without an open flame or fan noise. Camco's catalytic heater fits a bedroom, RV, or small cabin where silence and a flameless burner matter more than fast heat.

• Heat output: 3,200 to 6,000 BTU adjustable
• Coverage: up to 230 sq ft
• Safety: flameless catalytic combustion plus oxygen-depletion sensor
• Operation: silent, near-total fuel efficiency, portable or wall-mount
• Fuel: 1 lb cylinder, or bulk propane via hose
• Price: Around $400 to $500

Camco Olympian Wave 6 reviews

Owners rate it around 4.3 stars and value the silent, flameless design and the peace of mind over open-flame units. The common complaint is that heat output feels modest and the room warms slowly.

Should you buy the Camco Olympian Wave 6?

Buy the Wave 6 if you want the safest-feeling, quietest heat for a bedroom or RV during an outage. Pass on it if you need fast, strong heat for a cold living room, where the Big Buddy or DXH12B move more air.

Can a winter outage last long enough to need backup heat?

Multi-day winter outages are common enough that a single propane cylinder rarely covers a real event. Plan for days, not hours.

Winter Storm Fern in January 2026 left more than 1,005,641 customers without power at its peak. Some areas of Tennessee and Mississippi went 6 or more days without electricity as ice brought trees down on power lines. Read our winter storm guide for the full prep list.

Similarly, Winter Storm Elliott in December 2022 knocked out power for 1.5 million customers at its peak, with rolling blackouts ordered from Tennessee to the Carolinas on Christmas Eve. For homes in cold regions, an ice storm can mean days without heat.

How to choose an indoor propane heater for an outage

The right heater comes down to four buying decisions: how big a space you need to warm, how long the outage might run, how the heater lights, and how you ventilate it. Get those right and the rest is preference.

• Match BTU to room size. Roughly 30 to 40 BTU per square foot keeps a room comfortable, so a 200 sq ft room wants about 6,000 to 8,000 BTU. Buy too small and it won’t hold up.
• Plan fuel for the whole outage. A 1 lb cylinder lasts hours, not days. If your area sees multi-day events, choose a heater that accepts a 20 lb tank with a hose, and get spare cylinders ready.
• Confirm it lights without power. Every pick here lights by piezo or battery, so it works when the grid is down. Skip anything that needs a wall plug to run heat.
• Always ventilate and run a CO alarm. Indoor-safe means the ODS shuts the heater off as oxygen drops, not that the heater needs no air. Follow the manufacturer's ventilation requirements and always use a battery-powered carbon monoxide alarm in the room.

For whole-home backup, consider a portable generator, standby generator, or battery backup system. Electric space heaters can consume substantial generator capacity.