Mr. Heater F215100 MH4B 3,800 BTU Little Buddy Portable Radiant Propane Heater
When the chill sets in, the Mr. Heater Little Buddy MH4B is like that friend who always brings the warmth—literally. Pumping out a cozy 3,800 BTU, it’s perfect for heating up spaces as big as 95 sq. ft., whether you’re crammed in a tent, chilling in a tiny room, or hosting an impromptu outdoor hangout.
And because we care about you not turning into a popsicle (or worse), it’s packed with safety smarts: an automatic low oxygen shut-off (because breathing is kind of important), a tip-over shut-off (for those "oops" moments), and some fancy patented cross-thread protection (no leaks here).
Got a 1-pound propane cylinder? Great—just don’t forget to bring one, because this little heater will keep you toasty for up to 5.6 hours without making a peep or stinking up the place. Quiet, clean, and odor-free? Yes, please.
Heads up, though: this isn’t your golf cart’s new best friend, and using sketchy accessories might just kiss your warranty goodbye. Just saying.
General specs
- Brand: Mr. Heater
- Model: F215100 MH4B
- Seller: Amazon
- ID: B001CFRF7I
- Usage: Indoor and outdoor use, Not for use with golf carts or motorized vehicles
- Runtime: 5.6 hours at max BTU on a 1-pound cylinder (not included)
- BTU Output: 3,800 BTU per hour
- Coverage Area: Up to 95 sq. ft.
- Safety Features: Automatic low oxygen shut-off system (ODS), Tip-over safety shut-off, Cross-thread protection
- First listed by seller: 3/24/25
If you are interested in more details, you can find full information on the seller's page.
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Price History for seller Amazon
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| Brand | Mr. Heater | Mr. Heater | Mr. Heater | Heat Hog | Avenlur | Remington |
| Model | F215100 MH4B | F232050 | F232000 | HH-09SLN-A | Avenlur-XXX | REM-16-TTC-O |
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| Price | $69.99 | $89.00 | $89.97 | $94.99 | $269.00 | $59.99 |
| Seller | Amazon | Amazon | Amazon | Amazon | Amazon | Amazon |
| Update | Mar 21, 2026 | May 17, 2026 | May 8, 2026 | May 13, 2026 | Mar 21, 2026 | Mar 21, 2026 |
| Fuel Type | Propane | Propane | Propane | Propane | Propane | |
| Burner Type | Radiant | Radiant | Radiant | Radiant | Radiant | |
| Form Factor | Portable Heater | Pedestal | Pedestal | Tower | Dish | |
| Item Weight | 9.5 pounds | 9 pounds | 65 pounds | 2.99 pounds | ||
| Mounting Type | Floor Mount | Floor Mount | Floor Mount | Floor Mount | Floor Mount | |
| Special Feature | Portable, Bladeless, Tip-Over Protection | Low-oxygen safety shut-off system | Portable, Lightweight, Adjustable Tilt Head | Portable, Wheels | Portable | |
| Heating Coverage | 225 sq ft | 225 sq ft | 225 sq. ft. | 160 square feet | 300 square_feet | |
| Product Dimensions | 13.4"D x 15"W x 8.3"H | 7.7"D x 13.4"W x 15"H | 11.4"D x 12.4"W x 16"H | 28.74"D x 28.74"W x 89.37"H | 13"D x 7"W x 9"H | |
| Included Components | Heater, Owners' Manual | Portable Buddy Heater, Piezo Igniter | wind-resistant frame, safety shut-off valve, tip-over switch | |||
| Indoor Outdoor Usage | Indoor | Outdoor, Indoor | Outdoor | |||
| Warranty Description | 1-Year Limited warranty | 1-Year Limited Warranty | 1-Year Limited Warranty | 1-Year Limited Warranty | ||
| Recommended Uses For Product | Outdoor Use | Office, Garage, Outdoor, Desk, Indoor | Hunting, Garage, Tailgating, Ice Fishing, Camping | Outdoor | Garage | |
| Room Type | Living Room | Home Office | Living Room, Patio | Garage | ||
| Number of Speeds | 2 | 4 | 3 | |||
Mr. Heater F215100 MH4B
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