Kerosene vs Propane Heater: Heat Output, Run Time, Fuel, and Safety Compared
Output, run time per fill, fuel, and the safety rules for each - side by side
Both are fuel-burning heaters that work without electricity, which is why people compare them for power outages, garages, and workshops. The differences are in output, run time, fuel handling, and the safety rules.
Side by Side
| Heater | Fuel | BTU | Heats up to | Run time | Source |
|---|---|---|---|---|---|
| Mr. Heater Little Buddy | Propane (1 lb) | 3,800 | 95 sq ft | 5.6 hr | Mr. Heater |
| Mr. Heater Portable Buddy | Propane (1 lb or 20 lb w/ hose) | 4,000 / 9,000 | 225 sq ft | 3 hr high / 6 hr low (1 lb) | Mr. Heater |
| Mr. Heater Big Buddy | Propane (two 1 lb or 20 lb) | 4,000 / 9,000 / 18,000 | 450 sq ft | Up to 11 hr (two 1 lb) | Mr. Heater |
| Sengoku HeatMate HMN-110 | Kerosene (1.2 gal) | 10,000 | 400 sq ft | Up to 14 hr | Sengoku |
| Comfort Glow KW-24J | Kerosene (1.9 gal) | 23,800 | 1,000 sq ft | Up to 12 hr | Listing |
Choose Propane If...
You want a small, light heater you can carry and start quickly, you already have a propane grill tank, or you need heat for a few hours at a time. Mr. Heater's Buddy heaters have an oxygen depletion sensor and tip-over shutoff and are listed by the maker as indoor-safe. See our propane heater guide and Buddy vs Big Buddy comparison.
Choose Kerosene If...
You want longer run time per fill and more output from one heater, and you're willing to store 1-K kerosene and follow the ventilation rules. Check your local rules first. Massachusetts says unvented kerosene heaters are illegal to sell or use there. See our kerosene heater guide.
Common Questions
Which is safer indoors?
Both release carbon monoxide. Mr. Heater lists its Buddy heaters as indoor-safe with low-oxygen shutoffs; the CPSC says kerosene heaters also give off nitrogen dioxide and need ventilation. Whichever you use, run a CO alarm and follow the manual.
Which is cheaper to run?
That depends on local fuel prices and how you use it, so we don't give a single answer. Compare the heater's BTU rating and run time with what fuel costs you locally.
Bottom Line
For portable, occasional heat: a propane Mr. Heater Buddy. For longer run times and more output from one heater: a kerosene heater like the Sengoku HeatMate or Comfort Glow KW-24J. For a garage you heat daily, see our garage heater guide.
Where to Buy Our Picks
The products from this guide, with current prices on Amazon.
Propane Pick
Mr. Heater Portable Buddy (Propane, 4,000/9,000 BTU)
Up to 225 sq ft on a 1 lb cylinder, low-oxygen and tip-over shutoffs; Mr. Heater lists it as indoor-safe.
Check price on AmazonSold by Amazon
Kerosene Pick
Sengoku HeatMate HMN-110 (Kerosene, 10,000 BTU)
- Up to 400 sq ft
- 1.2-gallon tank
- Up to 14 hours per fill
- Auto shutoff and tip-over switch
Third-party seller when we checked.
Check price on AmazonCheck the seller on Amazon
More Propane Heat
Mr. Heater Big Buddy (Propane, up to 18,000 BTU)
Up to 450 sq ft; two 1 lb cylinders or a 20 lb tank with a hose, per Mr. Heater.
Check price on AmazonSold by Northern Tool + Equipment on Amazon
Most Heat
Comfort Glow KW-24J (Kerosene, 23,800 BTU)
- Convection heat for up to 1,000 sq ft
- 1.9-gallon tank
- Up to 12 hours
- According to the listing
Sold by a third-party seller at our last check
Sources
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