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Nothing tests a plan like the moment the power cuts out and the dog claims the only warm blanket in the house. Portable gas heaters solve that by burning propane, butane or natural gas, so the heat keeps coming without a plug. After comparing 6 models, the Gsmhoat 18,000 BTU Propane Heater is our top pick. It reaches its peak output across three settings, covers up to 450 square feet and shuts off through an oxygen depletion sensor. The Hisencn Gas Heater is our alternative pick, with 2,300 watts of radiant heat from a butane cartridge.
Pros
- 3 heat settings: 6000, 12000, or 18000 BTU output
- Heats areas up to 450 square feet
- Piezo electric ignition for instant start up
- Tip-over switch and oxygen depletion sensor for safety shutoff
- Includes CSA-approved regulator to help prevent leaks
Cons
- Meant for outdoor or well-ventilated garage use only, not enclosed indoor rooms
- Requires assembly with included tools before first use
- Runs on a 20lb propane tank, which adds setup and refill needs
Pros
- 2300W radiant heat output for camping, patio and workshop spaces
- Piezo ignition with adjustable flame control knob, no matches needed
- Portable butane cartridge system with guided connector and magnetic positioning
- Integrated metal carry handle, weighs approximately 3.4 lb for easy transport
- Metal guard rail and protective cover surround the heating area
Cons
- Built for well-ventilated outdoor areas, not intended for indoor use
- Runs on butane gas cartridges, so you must keep extra fuel on hand
- No thermostat or auto shut-off mentioned, so flame level needs manual adjustment
Pros
- 3 heat settings, 6,000, 12,000, and 18,000 BTU
- Warms areas up to 450 sq.ft
- Low oxygen, tip-over, and flameout protection
- Runs on a standard 20 lb propane cylinder
- 5 casters, including 2 with brakes
Cons
- 20 lb propane cylinder is not included
- Fuel heater needs proper ventilation and safe placement
- Outdoor patio heater, not stated as indoor rated
Pros
- 10,000 BTU output
- Heats up to 500 sq. ft.
- High, medium, and low thermostat control
- Wall mount hardware and base feet included
- ODS shutoff and ANSI certified
Cons
- Heats up to 500 sq. ft., not for larger areas
- Natural gas fuel only
- 23 inches tall, needs suitable wall or floor space
Pros
- Dual 4,000 or 9,000 BTU settings for adjustable heat output
- Rated to heat spaces up to 225 sq. ft.
- Runs up to 5.4 hours on a 1 lb. propane tank
- Up to 108 hours of runtime with an optional 20 lb. cylinder setup
- Includes low oxygen shutoff and tip-over shut-down safety features
Cons
- Indoor use is not approved in Canada or Massachusetts
- Requires propane tanks or cylinders, adding ongoing fuel needs
- At 7.1 lbs it is heavier than some small electric space heaters
Pros
- Three BTU settings (4,000, 9,000, 18,000) for adjustable heat output
- Heats spaces up to 450 sq. ft. with radiant warmth
- Built-in fan helps circulate warm air through the room
- Electronic ignition for quick, push-button starts
- Approved for both indoor and outdoor use
Cons
- Not approved for indoor use in Canada or Massachusetts
- Weighs 14.11 pounds, making it less portable than smaller units
- As a propane heater, it requires fuel handling and proper ventilation
What We Looked For in Gas Heaters for Garages and Power Outages
Gas heat fixes the outage problem but adds a combustion problem, so every pick had to balance output against air quality and fire risk. According to the U.S. Fire Administration, portable heater fires were only 3 percent of home heating fires but accounted for 41 percent of fatal ones.
- Heat output and coverage: BTU output decides whether a heater warms a whole workshop or only the spot where you stand. The Gsmhoat 18,000 BTU Propane Heater steps through three settings and tops out at 18,000 BTU. It is rated for up to 450 square feet, enough for a garage or workshop with a door cracked for air. Among the five picks rated in BTU, top output runs from 9,000 to 18,000 BTU. Their rated coverage spans 225 to 500 square feet, so the low end suits a shed or tent and the high end a full garage.
- Indoor rating and oxygen depletion sensor: A heater meant for a living room needs a sensor that shuts it down before the air turns dangerous. The ProCom MN100TPA is built for residential rooms, burns natural gas at up to 10,000 BTU and is rated for up to 500 square feet. Its pilot oxygen depletion sensor cuts the flame if oxygen runs low, and it carries ANSI certification. According to the U.S. Consumer Product Safety Commission, unvented gas heaters should have exactly this kind of sensor. Three of our picks are listed for indoor use, though two of them note that indoor use is not approved in Canada or Massachusetts.
- Ventilation and carbon monoxide: Every gas heater consumes oxygen and gives off combustion gases, so airflow matters as much as output. Four of our six picks list an oxygen depletion sensor or a low-oxygen shutoff, but a sensor on the heater is not a carbon monoxide alarm. The Centers for Disease Control and Prevention advises installing a battery-operated carbon monoxide detector and never covering a space heater. Two of our picks are sold mainly for outdoor and well-ventilated spaces, and we would keep them there.
- Fuel type, tank size and run time: Four of our picks burn propane, one runs on natural gas and one takes a butane cartridge. One compact pick lists up to 5.4 hours on a 1-pound tank. Hooked to a 20-pound cylinder with an optional hose and fuel filter, that same heater lists up to 108 hours. The CDC says to use only the fuel a heater is designed for, so match the cylinder or cartridge to the model.
- Ignition and safety shut-offs: Four of our picks light with a push-button, piezo or electronic igniter, so you never hunt for a match in the dark. The Jocoevol 18,000 BTU Propane Heater stacks three layers of defense: low oxygen protection, tip-over protection and flameout protection. It also lists noise under 30 dB, which helps if it sits near a reading chair or a workbench. Three of our picks list a tip-over shutoff, a feature the CPSC requires on electric and kerosene heaters.
- Size and portability: A heater you dread moving ends up in the wrong spot. The lightest pick weighs about 3.4 pounds and has a metal carry handle for moving between a campsite and a patio. A cabinet-style pick rolls on 5 casters, 2 of them with brakes to hold it in place. One natural gas pick includes both wall-mount hardware and base feet, so it can stay fixed or stand on the floor.
We left out central furnaces and whole-house systems because they need professional installation, not a quick hookup during an outage. Water heaters and heated blankets do a different job. We also skipped outdoor-only patio heaters built purely for open decks, since they are not rated for enclosed spaces. A few more gas heaters came close, and they are worth a look if your space or budget points elsewhere.
Other Gas Heaters Worth Considering
These are other gas heaters we looked at but did not put on our main list.
If you only need to warm a tent corner or a small ice shanty, the Mr. Heater Little Buddy puts out 3,800 BTU and is rated for up to 95 square feet. That is about a fifth of the 18,000 BTU our top pick delivers. At 5.6 pounds it is easy to carry, and it includes tip-over protection.
Want our top pick’s output in a different package? The Gasland MHA18W matches it at 18,000 BTU and up to 450 square feet, with tip-over protection. It brings a different design and feature mix, so it makes sense if you prefer its layout over the cabinet and frame styles on our list.
And if raw heat is the whole reason you are shopping, the Benass 30,000 BTU Propane Radiant Heater delivers 30,000 BTU, about two-thirds more than our top pick. It includes tip-over protection, but that much output calls for open air or a large, well-ventilated work area rather than a closed room.
FAQs
Is it safe to run a portable gas heater indoors?
Only if the heater is rated for indoor use and the room has fresh air coming in. Three of our picks carry an indoor rating, and four list an oxygen depletion sensor or low-oxygen shutoff. The CDC also recommends a battery-operated carbon monoxide detector in any home that uses fuel-burning heat.
How many BTU do I need to heat a garage or workshop?
Among our picks, rated coverage runs from 225 to 500 square feet. Heaters at the 18,000 BTU level are rated for up to 450 square feet, which covers most single garages and home workshops. Drafty spaces with poor insulation will need the higher settings more often.
How long will a propane tank last during a power outage?
Run time depends on the tank and the heat setting. One of our compact picks lists up to 5.4 hours on a 1-pound tank and up to 108 hours on a 20-pound cylinder. Keeping a spare 20-pound cylinder on hand stretches your heat through a multi-day outage.
How far should a gas heater sit from furniture and bedding?
The CPSC, the CDC and the U.S. Fire Administration all say to keep at least 3 feet between a heater and anything that can burn. Set it on a level, hard, nonflammable surface rather than a rug. Turn it off when you leave the room or go to bed.
Sources
- CPSC Offers Tips to Prevent Home Fires From Space Heaters, U.S. Consumer Product Safety Commission. Fire-safety tips and required safety features for space heaters.
- Safety Guidelines: During & After a Winter Storm, Centers for Disease Control and Prevention. Winter heating safety for space heaters, kerosene heaters and carbon monoxide.
- Heating Fire Safety, U.S. Fire Administration. Home heating fire statistics and prevention messages.
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