Mr. Heater Buddy FLEX MH11BFLEX
#9 in PortableFull review
A compact, push button alternative to the Portable Buddy for ventilated tents and cabins, with a slightly higher low setting. Keep the fresh air the maker’s manual requires.
Amazon $129$129
3.6/5
For heating a small tent, blind or ice shanty with ventilation, where a light one cylinder heater is all that fits. Follow the maker’s vent rule of at least 4 sq in of fresh air.
- 3,800 BTUHeat output
- Indoor (ventilated)Use
- CSASafety listing
- 3 yearsWarranty
Check price at Amazon$69.99
Price checked October 30, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Approved by the maker for ventilated tents, cabins, ice huts and truck caps
- Shuts itself off if it tips or if oxygen in the space runs low
- Small enough to carry with one hand and run from a single 1 lb cylinder
- Three year warranty on the maker page
Cons
- Only 3,800 BTU, rated for about 95 sq ft
- One heat setting, so no way to turn it down
- Cannot be hooked to a 20 lb tank for longer runs
The Mr. Heater Buddy family
Every Mr. Heater Buddy model we rank, smallest first. Ratings compare each against its own type.
| Model | Heat output | Rating | Price |
|---|---|---|---|
| Mr. Heater Little Buddy MH4B (this one) | 3,800 BTU | 3.6/5 | $69.99 |
| Mr. Heater Portable Buddy MH9BX | 4,000 to 9,000 BTU | 4.5/5 | $89.97 |
| Mr. Heater Hunting Buddy MH12HB | 6,000 to 12,000 BTU | 3.9/5 | $126.48 |
| Mr. Heater Big Buddy MH18B | 4,000 to 18,000 BTU | 3.9/5 | $240.26 |
How it scores
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its type. How we rank explains each one.
Specifications
| Model number | MH4B (F215100) |
|---|---|
| Heating | |
| Heat output | 3,800 BTU |
| Type | Portable |
| Use | Indoor (ventilated) |
| Heats up to | 95 sq ft |
| Thermostat | No |
| Fan | No |
| Fuel and power | |
| Fuel | 1 lb cylinder |
| Hose included | No |
| Ignition | Push-button piezo |
| Power needed | None |
| Safety | |
| Safety listing | CSA |
| Low-oxygen shutoff | Yes |
| Tip-over shutoff | Yes |
| Flame-out shutoff | Yes |
| Build | |
| Dimensions | 12 x 9.75 x 10.2 in |
| Weight | 5.8 lb |
| Warranty | 3 years |
| Released | 2010-01-13 |
Alternatives in this type
WELLUCK ZRA18M 18,000 BTU
#10 in PortableFull review
For buyers short on storage space who want an 18,000 BTU heater for outdoor or well ventilated indoor spaces. The seller limits indoor use to well ventilated areas.
Amazon $158.95$158.95
Avenger 22BF-A00 18,000 BTU
#12 in PortableFull review
A plain 18,000 BTU cabinet heater for patios and open work areas. It is sold as an outdoor heater, so use it that way.
Amazon $138.82$138.82
Compare
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