Yes, propane heat works during a power outage. A propane heater burns stored fuel and needs no electricity from the wall, so it keeps running when the grid goes down. Nothing in the ignition path depends on a mains outlet or a generator. That makes propane the most dependable emergency heat source most households can own.
There is one catch, and it matters more than any spec on the list. Propane combustion indoors produces carbon monoxide and water vapour, so a heater is only safe indoors if it is explicitly indoor rated, has an oxygen depletion sensor (ODS) and a tip-over shutoff, and runs with a working carbon monoxide alarm in the room. If you take nothing else from this guide, take that.
Below is the best propane heaters for power outages list, nine picks built around one question: how long can this thing run, and on what fuel. We ranked them on real owner review volume, fuel independence, safety hardware and how each one behaves when the power has already gone out. Specifications come from the manufacturer listings, and the impressions come from what owners report after actual storms.
For broader coverage, we also cover indoor propane space heaters generally in our propane heater buying guide and fixed units in our propane wall heater guide.
Best heater for a power outage at a glance
Ranked by how independent the fuel is from the grid:
Propane radiant heater with a 1 lb cylinder - no power at all, warm the person or one small room, longest shelf life.
Propane heater with a 20 lb tank and regulator - the same heat for far less fuel swapping, best for all-night runs.
Propane blue flame convection heater - actually warms the air of a room rather than a point in front of it.
Propane forced air heater - fastest way to warm a garage or workshop, but the blower is loud.
Propane tank top infrared heater - garage, porch and job site heat, outdoor rated only.
Kerosene heater - also fuel independent, but a different storage and ventilation routine.
Wood stove or fireplace - works if the chimney is clean and you have dry fuel.
Electric heater with a home backup battery - quiet and safe, but only as long as the battery lasts.
Our home backup battery guide covers that last option, and our emergency lantern guide covers the part everyone forgets at 2am.
Top 3 Best Propane Heaters for Power Outages in 2026
These three cover the most common outage scenarios: one room of a house, the whole house on a budget, and a garage or covered outdoor space.
Mr. Heater Portable Buddy 9000 BTU
- 4000 or 9000 BTU radiant
- Indoor and outdoor rated
- 225 sq ft coverage
- 5.4 hours low on a 1 lb cylinder
Mr. Heater 20000 BTU Blue Flame
- 20000 BTU convection
- Heats up to 700 sq ft
- Indoor rated with ODS
- No electricity needed
GASLAND MHA18B 18000 BTU
- 18000 BTU radiant
- Three heat modes
- 450 sq ft coverage
- 20 lb tank housed inside
Propane Heaters for Power Outages: Quick Overview
Every heater in the list, with the number that decides whether it fits your outage: heat output, whether it is rated for enclosed rooms, and how it is fuelled.
| Product | Specs | Action |
|---|---|---|
| Mr. Heater Portable Buddy 9000 BTU |
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Check Latest Price |
 Mr. Heater Little Buddy 3800 BTU |
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| Mr. Heater 20000 BTU Blue Flame |
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 Dura Heat TT-360 40000 BTU Tank Top |
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| GASLAND MHA18B 18000 BTU |
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 Remington 60000 BTU Forced Air |
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 XtremepowerUS 30000 BTU Tank Top |
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 CAMPLUX 12000 BTU |
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 Avenger 18000 BTU Cabinet |
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Check Latest Price |
1. Mr. Heater Portable Buddy 9,000 BTU - the outage default for one room
Mr. Heater 9,000 BTU Portable Buddy Radiant Propane Heater
9000 BTU radiant
225 sq ft
Indoor and outdoor rated
Weighs 7.1 lb
Pros
- Dual 4000 and 9000 BTU radiant heat
- Indoor and outdoor rated
- 225 sq ft of coverage
- Low-oxygen safety shutoff built in
- Self-extinguishing materials
Cons
- Radiant heat throws in a straight line
- 1 lb cylinder empties in 2.4 hours on high
With more than 29,000 reviews at a 4.7 average, this is the most proven radiant propane heater in the group, and it is the one we keep coming back to. It puts out a selectable 4,000 or 9,000 BTU and covers roughly 225 square feet, which is a bedroom, a home office or a living room corner where the family sits during a blackout.
The reason it lands at the top of an outage list is that it needs nothing external. It lights off a standard 1 lb cylinder, needs no mains power, no battery and no generator, and starts within seconds of a button press. When the grid drops at midnight, the last thing you want is a warm-up sequence that depends on an outlet.
Runtime is the honest trade-off. Owners report about 5.4 hours on the low setting and 2.4 hours on high from a single 1 lb cylinder, and the safety shutoff, the self-extinguishing housing and the indoor rating are the parts that make it legal to run in a living space. The ODS is the reason it shuts itself off before oxygen drops to a dangerous level.
What it cannot do is heat air. This is infrared radiant heat, so it warms you, your desk chair and the sofa directly in front of the unit, while the far corners of the room stay cold. r/CampingGear reviewers describe the Buddy as feeling like cheating, which is the right word for something this small that works so predictably.
Will it actually last through a long outage
Not on one cylinder if you want it running overnight. A single 1 lb cylinder holds roughly 21,500 BTU of energy, so the low setting gets you about five hours and the high setting about two and a half. For a twelve-hour outage you are looking at three or four cylinders for this unit alone.
That is exactly why owners in r/preppers report running the thermostat down to 59 degrees overnight, or running the heater on low with a crack in the window, rather than at full tilt. The heater is not the weak link; the fuel supply is.
Who should skip it
Skip it if you want a whole room of warm air, or if your outage plan depends on a single 20 lb tank and no backup fuel. Radiant heat aimed at a wall or an empty chair is wasted output, and pointing it at the sleeping area of a sealed bedroom is exactly the situation the manual warns about.
For a genuinely cold room, pair it with a carbon monoxide alarm on the same wall and keep the ventilation opening the manual specifies. If the manual is in the box, read it. r/asheville owners make the same point about the Mr. Heater line: they work, if you follow the safety rules in the manual.
2. Mr. Heater Little Buddy 3,800 BTU - the one that fits in the go bag
Mr. Heater 3,800 BTU Little Buddy Portable Radiant Propane Heater
3800 BTU radiant
95 sq ft
Weighs 5.6 lb
One-button ignition
Pros
- Weighs 5.6 lb
- one of the lightest units here
- One-button ignition with no battery
- ODS and tip-over shutoff
- Quiet and odor-free
- Very small floor footprint
Cons
- 95 sq ft coverage ceiling
- Single heat level with no thermostat
- Radiant heat must be aimed
This is the emergency unit you keep where you can grab it. At 5.6 pounds, with an eight-inch round stand and about 95 square feet of rated coverage, it heats a person, a small room or a vehicle. Roughly 8,800 reviews sit at a 4.5 average, so it is a proven design rather than an experiment.
Outage logic is simple: one 1 lb cylinder, one-button ignition, no electricity, no battery. That makes it the model people in r/preppers and permies name when they talk about a heater they can use inside a cabin without planning a fuel line. It also has the two shutoffs that matter, tip-over and low oxygen.
The ceiling is heat output, not safety. At 3,800 BTU it will not lift a living room to living-room temperature in a deep cold snap; it will make a small enclosed space genuinely comfortable for one or two people. There is a single heat level with no thermostat, so you control the temperature by opening a door or turning the knob down, which is a real limitation in a long outage.
Owners also flag the same directional characteristic as its big brother. Radiant heat travels in a line, so the unit has to point where the people are. If the wind or a draft shifts the room, the effect changes quickly.
Where it earns its place in an outage kit
Put it where you sleep or where a medically fragile family member sits. That is a small, defined zone, which is exactly the 95 square feet the manufacturer rates. It also packs well, so it is the natural pick for a vehicle, a go bag or a cabin where floor space is measured in feet, not rooms.
On fuel planning, owners consistently report running out sooner than the label suggests. Treat the cylinder as a short-session resource and keep several on hand.
Where it falls short
It will not heat a bedroom you are trying to sleep in for ten hours, because a single low setting with no thermostat is not a temperature control system. r/cabins owners with a larger Big Buddy call it fairly effective but not amazing, and the Little Buddy is a step below that in output.
If your outage plan needs warm air filling a room, this is the wrong shape of heater. Look at a blue flame convection unit instead.
3. Mr. Heater 20,000 BTU Blue Flame - the indoor pick for a whole-home outage
Mr. Heater 20,000 BTU Vent Free Blue Flame Propane Heater
20,000 BTU blue flame
Up to 700 sq ft
Indoor rated with ODS
Weighs 19.6 lb
Pros
- One of the only indoor-rated units here for whole-room heat
- T-stat thermostat cycles the burner
- No chimney or venting needed
- Runs on one AAA battery for ignition
- Wall mount hardware included
Cons
- Heavy propane consumption on low
- Oversized for small rooms
- Hose and regulator bought separately
This is the only heater in the list that is genuinely rated to heat a room rather than a person. At 20,000 BTU with up to 700 square feet of coverage, vent-free blue flame convection, it warms the air of a room the way a furnace does, and it is listed for indoor residential use.
Multiple owners describe running it through multi-day sub-zero outages at the lowest thermostat setting and keeping the house in the upper sixties to low seventies. The T-stat is the feature they praise most, because it cycles the burner down instead of leaving you to guess with a manual dial.
It needs no electricity at all. Ignition is battery operated electronic ignition using a single AAA battery, which is included, and once lit it runs on propane and nothing else. At 19.6 pounds it is a real appliance rather than a portable toy, and it can stand on the supplied feet or mount on a wall with the included bracket.
The catch is fuel. Reviewers consistently report heavy consumption, including one 100 lb tank emptied in about 11 days of near-continuous use on the lowest setting. That is fine as emergency heat and expensive as primary heat, so plan fuel before the storm rather than during it.
Is it safe to run a Buddy heater indoors, and is this one better
Yes, if the unit is indoor rated and the room is not sealed. This one carries an ODS low oxygen shutoff control and is listed for indoor use. The confusion people have in forums is between a sensor that stops the burner when oxygen drops and a carbon monoxide alarm that warns you about the combustion product itself. They are not substitutes, so run a CO alarm too.
Keep the ventilation opening the manual specifies. Unvented propane combustion puts water vapour into the room, which r/VanLife owners know well from condensation, and in a tightly sealed space that moisture plus the propane odour can build up fast.
Who should look past this one
Anyone in a small flat or a single room. Twenty thousand BTU in a bedroom is oversized, the thermostat dial reads 0 to 5 rather than degrees, and owners report the range is narrow. The hose, regulator and often a 90-degree brass fitting are not included, so add those to your pre-outage checklist.
Also skip it if refills are not realistic where you live. A heater that empties a 100 lb tank in days during a supply-limited outage is a liability.
4. Dura Heat TT-360 40,000 BTU - the garage and workshop pick
Dura Heat TT-360 Propane(LP) 360 Degree Tank Top Heater, Length: 8.9in, Width: 8.9in, Height: 20.24in,Silver
40000 BTU radiant
1,000 sq ft
Outdoor use only
Regulator and hose included
Pros
- Rated for 1000 sq ft of uninsulated space
- 360 degree emitter throws heat outward
- Mounts straight to a 20 lb tank
- Three heat levels
- Regulator and hose in the box
Cons
- Outdoor use only
- Emitter gets very hot
- Burns a 20 lb tank in about 12 hours on low
When the power goes out in winter and you need to keep a garage or workshop workable, 40,000 BTU from a tank top unit is the fastest route to usable heat. Owners heating uninsulated spaces roughly 35 by 9 feet report reaching the sixties within five to ten minutes, then holding on low.
The 360 degree emitter is the design point. Unlike a single-face radiant unit, it throws heat outward in all directions from a stainless steel reflective dish behind a chrome wind guard, and reviewers say it is very quiet compared with forced air heaters. It mounts directly onto a 20 lb propane tank with no assembly and no power cord, and the regulator and hose are in the box.
There is a built-in tip-over shutoff, and it has been verified working after accidental knocks. That matters outdoors, where a heater and a tank can be jostled. Three heat levels let you drop from full output once the space is warm, which is the single biggest fuel lever you have.
Be clear about the rating. This is outdoor and construction use only, up to 1,000 square feet, and it is not listed for indoor heating. In a closed garage during a blackout you are now dealing with a combustion heater in an enclosed space, so ventilate it or use an indoor-rated unit instead.
How long does the fuel last in a garage
Plan on roughly 12 hours from a 20 lb tank on the low setting, based on owner reports. That is a full work session or an evening of a three-day outage, not a week. A 20 lb tank holds roughly 430,000 BTU, so the maths is straightforward: bigger BTU, fewer hours.
The tip-over switch can latch if the unit and tank are moved, so re-seat both on a flat surface before relighting. Wind also affects performance, so put it out of direct draught.
Who should buy this and who should not
Buy it if you heat a garage, a barn, a covered patio or a job site where a fan-driven unit would be too noisy or too slow. The chrome guard and the dish stand up well to a workbench environment.
Do not buy it to heat a living space, and be careful with children or pets around the emitter, which gets very hot. If the garage is attached and you plan to run it overnight, an indoor-rated convection unit is the safer call.
5. GASLAND MHA18B 18,000 BTU - the best value outage and garage heater
GASLAND MHA18B Propane heater Indoor Outdoor,18,000 BTU, Max Heat 450 Sq.Ft
18000 BTU radiant
450 sq ft
Outdoor rated with CSA listing
Pros
- CSA certified with tip-over and ODS shutoffs
- Runs on a 20 lb cylinder with no electricity
- Casters and carry handle built in
- Tank hidden inside the cabinet
- Three heat modes
Cons
- Outdoor and well-ventilated use rather than enclosed rooms
- Radiant heat depends on aim
This is the pick if you want 18,000 BTU of outage-capable heat without reaching for the biggest names in the category. Around 1,500 reviews sit at a 4.5 average, and the hardware list is short on nothing: CSA certification, tip-over protection, a low oxygen shutoff, three heat modes and 450 square feet of rated coverage.
It runs entirely on a 20 lb propane cylinder with no electricity needed, which is the defining feature during a blackout. The built-in casters and carry handle mean you can move it from a garage to a porch to a covered work area, and the tank is housed inside the cabinet rather than standing next to it.
Owners highlight the CSA listing plus the dual safety package, a combination you do not always get at this level. It is also quiet enough to sit near while reading or working, unlike forced air units, and the three modes let you cut output once the space is warm.
The rating is outdoor. Buyers use it in garages and covered areas with ventilation rather than fully enclosed rooms, and the radiant character means the heat lands where the cabinet points. Treat the 450 square feet figure as a maximum, not a promise.
Why it sits high in an outage list
Because it is fuel independent and it is safe to be near. When the grid drops, a heater that rolls, ignites without a plug, and shuts itself off on tip-over or low oxygen is worth more than a more powerful unit you cannot easily reposition. The 20 lb cylinder format also means far fewer fuel changes than 1 lb cylinders.
For a three-day outage, budget on the order of a tank every day at medium output and more than one tank if you keep it on high.
What it will not do for you
It will not warm the air of a closed living room safely, and it will not heat people standing several feet away, because radiant output drops off with distance and angle. If the outage plan is warm air in a bedroom, pick a convection heater instead.
Note also that a propane tank and a hose in genuinely cold weather can frost over, which weakens output until the ice clears.
6. Remington 60,000 BTU Forced Air - fastest way to warm a large space
Remington LP Forced Air Heater, Portable 60,000 BTU Space Heater for up to 1500 Square Feet - Liquid Propane Gas Powered, Tank Not Included
60000 BTU forced air
1,500 sq ft
Outdoor rated
Weighs 11 lb
Pros
- Up to 1500 sq ft of coverage
- the largest here
- Heats a two-car garage in about 10 minutes
- Triple safety cutoffs
- Continuous electronic ignition
- 10 foot hose and regulator included
Cons
- Blower is very loud
- Outdoor and ventilated garage use only
- Very short power cord
At 60,000 BTU this is the biggest heat output in the group, rated for up to 1,500 square feet, and it is the fastest way to make a large garage or workshop usable when the power drops. Owners report a two-car garage reaching a comfortable temperature in about ten minutes, even with a window open.
It weighs 11 pounds, and the steel body, adjustable height stand, 10 foot propane hose and regulator are all included. Continuous electronic ignition relights without manual intervention, so it keeps cycling through a long outage without a pilot light to babysit.
The safety package is three cutoffs: a thermocouple, a high-temperature limit shutoff and a flame-out fuel cutoff. Combined they make it a sensible choice for a space that will run unattended while you deal with the rest of the house.
Now the part that decides it for many people: the fan is very loud. Reviewers say plainly that the noise rules it out of bedrooms and living spaces, and one buyer returned over it. If your outage happens in a room where people are trying to sleep, this is the wrong heater.
How much propane does a 60,000 BTU heater burn
A lot, and quickly. A full 20 lb tank holds roughly 430,000 BTU, so at 60,000 BTU per hour that is about seven hours of continuous heat on a single tank. Step it down to low once the space is warm, because the adjustment settings change real consumption even when they feel coarse.
Run it on a schedule rather than continuously. For most outages, heating a garage for a few hours in the evening is more useful than a low setting running for three days.
Who should buy it
Buy it if the outage problem is a workshop, a two-car garage or a construction space, and if noise is not a factor. A forced air unit actually heats air, so a room can reach a usable temperature, which no radiant unit in this list manages the same way.
Skip it for sleeping areas and for enclosed living space. It is rated for outdoor or ventilated garage use, and the heat output is so strong that the thermostat feels barely meaningful.
7. XtremepowerUS 30,000 BTU Tank Top - the Most Versatile for porches and shops
XtremepowerUS 30,000 BTU Propane Tanktop Heater Infrared Dual Burner Safety Shut-Off Valve, Tip-Over Switch for Garage, Camping, Hunting Double Burner
15000 or 30000 BTU
750 sq ft
Outdoor use
Tank top mount
Pros
- Owners rate it as the best value per unit of heat
- Dual burner dish directs heat where you need it
- No assembly
- mounts straight to a 20 lb tank
- Three heat levels
- Tip-over switch cuts gas flow
Cons
- Match ignition only
- Outdoor rated and not for enclosed rooms
- Heat is thrown mainly to one side
For a covered porch, a workshop bay or a shop, this dual burner tank top unit delivers a lot of heat for very little money. Its 4.6 average is the highest rating among the tank top heaters here, across 397 reviews.
It produces up to 15,000 or 30,000 BTU across three adjustable levels, and the metal dish focuses heat outward toward a specific seating or work area rather than dispersing it. It mounts directly to a 20 lb propane cylinder with no assembly, and the rust-proof steel frame plus chrome emitter guard resist wind and accidental contact.
The tip-over switch cuts gas flow the moment the unit is knocked over, which is the safety feature that matters most for something standing at floor level in a working space. A low profile also suits a porch, where a tall columnar heater would be a ceiling hazard. Owners otherwise focus on value, the direct-to-tank hookup, and a dish that points heat at one spot rather than spreading it.
What you give up for the lower cost
Ignition is a match, through a side ignition hole. There is no piezo electric and no push-button start, which in a dark garage with a flashlight in your teeth is a genuine inconvenience. Some buyers have also reported missing screws in the box, so check the hardware before you light it.
It is described as outdoor rated. Light indoor use with ventilation and a CO alarm has worked for some owners, but do not treat that as a general rule.
Who it suits in an outage
Anyone whose heat problem is a semi-outside space and whose budget is tight. A garage bay, a covered porch, a market stall or a workshop with the door open will all be served by the dual burner dish pointing at the work area.
It is not a bedroom heater and not a whole-house heater. The heat is thrown mainly to one side, so position matters more than usual.
8. CAMPLUX 12,000 BTU - the one for camping, RVs and go kits
CAMPLUX Portable Propane Heater Outdoor and Indoor, 12000 BTU LP Gas Buddy Heater for Camping with ODS & Tip-over Protection, 1lb Propane Radiant Heating with LED light, Red
12000 BTU ceramic plate
Indoor and outdoor rated
Weighs 9.5 lb
LED handle light
Pros
- Runs on 1 lb cylinders or a 20 lb tank via hose
- Piezo ignition with no battery or external flame
- LED light in the handle
- Casters and a 20 lb tank support flap
- Reaches full heat in 30 to 40 seconds
Cons
- 4.3 average with 10% one-star ratings
- 1 lb cylinder burns fast
- Floor beneath the unit gets very hot
This is the one to pack. It is rated for both indoor and outdoor use, runs on a 1 lb cylinder straight out of the box or on a 20 lb tank through an optional hose, and lights with a piezo igniter controlled by a single knob. No electricity, no battery, no external flame.
The details that matter outdoors are the good ones. There is a built-in LED light in the handle for a dark campsite, casters so you can move it, and a rear flap with a removable brace that supports a 20 lb tank for multi-night use. Owners report full heat in 30 to 40 seconds, and no assembly is needed before you use it.
Its 4.3 average across 272 reviews is the lowest in the group, with 10% one-star ratings, so the spread of outcomes is wide. Buyers praise the fast heat-up, the piezo start, the LED and the ability to run off a 20 lb tank. The negative cluster is units arriving with a broken handle or a dead LED, plus a few early failures.
One reviewer notes the seller replaced a malfunctioning unit, which is worth knowing if you are relying on this in a remote area.
For camping, RV and vehicle use
Here it is genuinely strong. A tent, a van, an ice fishing shelter or an RV is a small defined space, which suits a 12,000 BTU ceramic plate burner with a low oxygen shutoff and a tip-over shutoff. The ODS behaviour is worth understanding in a vehicle: in a tightly enclosed space, expect the sensor to cycle the burner rather than let it run flat out.
Buyers who use it as an outage heater at home report adding a hose to a 20 lb tank, because a 1 lb cylinder burns through quickly. Get the hose before you need it.
Where it disappoints
The floor beneath the unit gets very hot, so use a stand or a heat shield on anything flammable, including flooring and mats. Heater and hose can also freeze in very cold conditions, which is a real limitation for winter camping.
Given the one-star share, inspect the handle and LED as soon as it arrives rather than during an emergency.
9. Avenger 18,000 BTU Cabinet - the longest runtime per tank
Avenger Portable Outdoor Propane Cabinet Heater – 18,000 BTU Radiant Gas Heater with Tip-Over & ODS Safety Shut-Off - Model # 22BF-A00
6000 to 18000 BTU
450 sq ft
Outdoor rated
Listed weight 8.35 kg
Pros
- Runs up to 72 hours on low with a 20 lb tank
- Oxygen depletion sensor and tip-over shutoff
- Push-and-turn piezo ignition needs no electricity
- Smooth casters and steel cabinet
Cons
- Listed for outdoor use
- Small review base of 143 ratings
- Radiant heat must be aimed at the space
This is the pick when the outage is long and you want one tank to last. Owners report up to 72 hours on the low setting with a standard 20 lb tank, which is the kind of number that changes how you plan a three-day event. The rating is 4.6 across 143 reviews, the best rating to review volume ratio in the group.
It offers three settings at 6,000, 12,000 or 18,000 BTU and covers up to 450 square feet. Ignition is push-and-turn piezo, so it starts with no electricity, no battery and no pilot light, and the safety package is an oxygen depletion sensor plus automatic tip-over shutoff. Casters and a steel cabinet make it easy to move between a patio and a garage.
The 6,000 BTU setting is the reason the runtime figure exists. A radiant cabinet at low output is a slow, gentle heat source, which is exactly the compromise people in r/preppers make when they accept a lower setting overnight in exchange for stretching the fuel.
The small review base is the honest caveat. With 143 ratings there is less long-term history here than the Mr. Heater models carry, and radiant heat has to be directed at the space rather than filling the room.
How the runtime compares in a three-day outage
On low, one 20 lb tank is reported to cover roughly three days of evenings. On the 18,000 BTU setting, the same tank is gone far sooner. Practically, that means you can run this at low overnight and still have fuel in the morning, which no forced air unit on this list can offer.
Plan conservatively anyway. Cold tank pressure, frost on the regulator and a cold-weather outage all reduce the usable output per hour.
Who should choose it
Choose it for a covered porch, a garage bay or an outdoor sitting area during a long outage, especially if you want to run it overnight on low. The 450 square feet radiant capacity and the casters suit a space that moves between uses.
Skip it for enclosed rooms. It is listed for outdoor use, and a 72 hour runtime does not make an outdoor-rated unit safe in a bedroom.
How to Choose a Propane Heater for Power Outages?
Match the BTU number to the space
BTU stands for British thermal unit, the measure of heat energy, and a heater's output tells you how much heat it can push into a space per hour. The rule of thumb most owners use is roughly 10,000 BTU for a small room, more for anything larger, and far more for a garage with an open door in winter.
Use the square foot rating on the listing as the ceiling rather than the promise. A 9,000 BTU radiant unit rated at 225 square feet will not keep a 225 square foot room at 70 degrees in a deep freeze. It will keep the area in front of it warm, which is a different and often more useful outcome.
Match the heater to the job rather than to the number. Bedroom, one radiant unit at 4,000 to 9,000 BTU. Main living space during an outage, a blue flame convection unit around 20,000 BTU. Garage or workshop, 30,000 to 60,000 BTU from a tank top or forced air unit.
Radiant, blue flame, convection or forced air
The heater type decides what gets warm, and this is the misunderstanding that frustrates people most in forums. Radiant infrared warms objects and people in front of the unit. Convection and forced air warm the air, which fills a room.
Radiant is quiet, fast to feel, and the least fuel-hungry way to warm one person, because it does not try to heat all the air in the room. It is also the type that frustrates anyone expecting the far wall of the room to warm up.
Blue flame convection needs a little longer to show its effect and then heats the whole space, which is why it is the right answer for keeping a house survivable. Forced air does the same faster and louder, with a blower that is disqualifying in a sleeping area.
When comparing, also check the indoor or outdoor rating on the label, not just the marketing copy. A radiant heater listed for outdoor use is a garage and porch heater no matter how good its safety sensors are.
Fuel setup: 1 lb cylinder or 20 lb tank and regulator
For any outage longer than a few hours, the 20 lb tank and regulator setup wins. A 1 lb cylinder holds roughly 21,500 BTU, while a full 20 lb tank holds roughly 430,000 BTU, so one tank replaces about twenty cylinders. A 100 lb tank is the same calculation at roughly 2,150,000 BTU.
That also solves the problem r/preppers threads raise constantly: running out of fuel faster than the label implies. A small 4,000 to 10,000 BTU heater on a 1 lb cylinder runs in the range of a few hours, while a 40,000 BTU unit on the same cylinder is a short session.
On a 20 lb tank, do the arithmetic before the storm. At 9,000 BTU a 430,000 BTU tank is roughly 47 hours of continuous heat. At 20,000 BTU it is about 21 hours. At 40,000 BTU, around 10 hours. At 60,000 BTU, closer to 7. Most of these heaters are running below full output overnight, so the real figure is usually better, but plan on the worst case.
Add a hose, a regulator and often a 90-degree brass fitting to the pre-outage checklist, because several indoor units do not include them. A fuel filter is also worth having, since plasticiser residue from the hose can clog a regulator and cause the heater that will not stay lit.
The safety checklist that matters in an outage
Check four things before you rely on any heater. First, that it is listed for the space you intend to use, indoor or outdoor. Second, that it has an oxygen depletion sensor, which shuts the burner off when oxygen drops. Third, that it has tip-over shutoff. Fourth, that you have a working carbon monoxide alarm in the same room, on a different wall or at least not directly above the heater.
The ODS sensor is not a CO alarm. It reacts to oxygen concentration, not to carbon monoxide in the room, and forum readers confuse the two constantly. You need both, plus a battery-operated alarm if the mains alarm dies with the power.
Two more practical rules. Oxygen depletion sensors have an altitude limit above which they repeatedly shut off, so a high-elevation cabin in winter may need a different heater. And spiders inside burner ports are a genuine, common cause of a pilot that will not stay lit; a clean burn tube and a routine check before winter solves it.
Keep a CO alarm near but not adjacent to the heater, and check the batteries every season, ideally alongside a test run of the heater. Our emergency weather radio guide is worth reading for the warning side of preparedness.
Running a Propane Heater Overnight: The Rules That Matter
Can you run a propane heater all night while you sleep? Many owners do, and the consensus advice in prepper forums is a Buddy heater with a CO alarm and a slightly open window. But the safe version of that answer has conditions attached, and the conditions come from the manufacturer manual rather than from forum consensus.
Do not run any unvented propane heater in a sleeping space with the door closed and windows shut. That is the scenario the manual's ventilation requirements exist for, and it is the one configuration that produces a carbon monoxide problem.
If you do run heat overnight, the compromise owners describe is a low setting, the lowest one the unit offers, with the ventilation opening the manual specifies and a CO alarm in the room. r/preppers users of a whole-home propane heater report holding the thermostat to 59 while asleep or away, and using a small portable heater at a lower setting when they are up.
Keep the heater where it cannot be knocked over, and never leave it in a room where a sleeping person cannot respond if the tip-over switch or the ODS fails. For households with infants, medically fragile members or anyone sedated by medication, skip overnight propane heat entirely and use an electric heater on a home backup battery instead, where the failure mode is a cold room rather than a combustion product.
Also plan the morning after. A heater that ran all night will have used a known amount of fuel, and the next decision is whether you can refill. Check supply realistically before the storm rather than during it, and keep a second fuel source in the house so an empty tank at 6am is not a crisis.
Frequently Asked Questions
Does propane heat work during a power outage?
Yes. A propane heater burns stored fuel, so it needs no electricity from the wall and keeps running when the grid goes down. Only a few models use a battery, and only for ignition. It is the most dependable emergency heat source most households can own, provided the unit is indoor rated and used with a carbon monoxide alarm.
What is the best heater to use during a power outage?
A propane heater with a 20 lb tank and regulator for anything longer than a few hours, because one tank replaces roughly twenty disposable 1 lb cylinders. Use a radiant indoor-rated unit for one room or one person, and a blue flame convection unit if you need the air of a larger space warmed. Kerosene and wood are also fuel independent.
What is the safest propane heater for indoor use?
The safest indoor setup is a heater that is explicitly indoor rated, has both an oxygen depletion sensor and tip-over shutoff, and runs with a working carbon monoxide alarm in the room. The oxygen depletion sensor shuts the burner off when oxygen drops; it is not a substitute for a CO alarm, because it senses oxygen rather than carbon monoxide.
Is it safe to run a propane Buddy heater indoors?
Yes, if it is the indoor rated Buddy model, the room is not sealed, you follow the manual's ventilation instruction, and a CO alarm is working. The Buddy family carries an oxygen depletion sensor and tip-over shutoff for exactly this reason. It heats a person and a small area rather than the air of a whole room.
Is it safe to run a Mr. Buddy heater all night?
Only with conditions. Do not run it in a sleeping space with the door closed and windows shut. If you run heat overnight, use the lowest setting, keep the ventilation opening the manual specifies, and keep a CO alarm in the room. Many owners instead hold a whole-home heater thermostat to 59 while asleep.
How long will a 20lb propane tank last on a little buddy heater?
A full 20 lb tank holds roughly 430,000 BTU, so at the Little Buddy's 3,800 BTU that is about 110 hours of continuous heat. In practice a thermostat or a lower setting stretches that considerably, and most people run it intermittently rather than flat out.
How long will a 100lb propane tank run a 20,000 BTU heater?
A 100 lb tank holds roughly 2,150,000 BTU. At 20,000 BTU that is about 107 hours of continuous heat, or just under four and a half days. Owners running a 20,000 BTU blue flame heater on the lowest setting through a long outage report a 100 lb tank lasting around 11 days, because the thermostat cycles the burner down.
Is a blue flame or infrared propane heater better?
It depends on whether you want warmth or heat. Infrared radiant warms you and nearby objects within a few feet and is quiet and fast, but leaves the rest of the room cold. A blue flame convection heater takes longer to show its effect and then warms the air of the whole space, which is what you want when a whole household needs heat.
Which heater pulls the least electricity?
A propane heater that needs no electricity at all, because it burns stored fuel. Most models need nothing but a button press or a piezo igniter, and the few that use a battery use a single AAA for ignition only. Electric heaters draw far more, and during an outage they only work if you have a home backup battery.
What is the most efficient propane heater for a garage?
For a garage, a radiant or forced air propane heater at 30,000 to 60,000 BTU run on a low setting once the space is warm. Radiant tank top units warm a person at a workbench while burning comparatively less fuel; forced air units warm the whole air of the space but are much louder and burn fuel far faster.
Best Propane Heaters for Power Outages: The Verdict
For most households the Mr. Heater Portable Buddy is the right first heater, because it is indoor and outdoor rated, needs no electricity at all, and has the largest proven owner history of any pick in this guide. It heats a room or a person, not a whole house, and that limit is worth stating plainly before you buy.
If the outage threatens the whole house, the Mr. Heater 20,000 BTU blue flame heater is the indoor-rated unit built for it, with a thermostat that saves fuel and a 700 square foot coverage rating. For garages and workshops, the Dura Heat TT-360 and the Remington forced air unit cover very different budgets for output. And for anyone who wants the longest possible run on a single tank, the Avenger cabinet runs up to 72 hours on low.
Whatever you choose, buy the fuel hardware at the same time: a 20 lb tank, a hose, a regulator, a fuel filter and a battery-operated carbon monoxide alarm. Check them before the storm, keep the ventilation opening clear, and this roundup of the best propane heaters for power outages gives you heat that keeps working when the electricity does not.