Mr. Heater MH4B Little Buddy 3800-BTU Indoor Safe Propane Heater with ODS & Tip-Over Protection
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
- BTU Output: 3,800 BTU per hour
- Coverage Area: Up to 95 sq. ft.
- Runtime: 5.6 hours at max BTU on a 1-pound cylinder (not included)
- Safety Features: Automatic low oxygen shut-off system (ODS), Tip-over safety shut-off, Cross-thread protection
- Usage: Indoor and outdoor use, Not for use with golf carts or motorized vehicles
- First listed by seller: 3/24/25
If you are interested in more details, you can find full information on the seller's page.
Buy on Amazon
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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 | $72.79 | $79.00 | $89.00 | $103.52 | $269.00 | $49.64 |
| Seller | Amazon | Amazon | Amazon | Amazon | Amazon | Amazon |
| Update | Dec 6, 2025 | Dec 6, 2025 | Dec 6, 2025 | Dec 6, 2025 | Dec 6, 2025 | Dec 6, 2025 |
| Special Feature | Portable, Bladeless, Tip-Over Protection | Low-oxygen safety shut-off system | Portable, Lightweight, Adjustable Tilt Head | Portable, Wheels | Portable | |
| Form Factor | Portable Heater | Pedestal | Pedestal | Tower | Dish | |
| Indoor Outdoor Usage | Indoor | Outdoor, Indoor | Outdoor | |||
| 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 | |
| Recommended Uses For Product | Outdoor Use | Office, Garage, Outdoor, Desk, Indoor | Hunting, Garage, Tailgating, Ice Fishing, Camping | Outdoor | Garage | |
| Mounting Type | Floor Mount | Floor Mount | Floor Mount | Floor Mount | Floor Mount | |
| Heating Coverage | 225 sq ft | 225 sq ft | 225 sq. ft. | 160 square feet | 300 square_feet | |
| Burner Type | Radiant | Radiant | Radiant | Radiant | Radiant | |
| Fuel Type | Propane | Propane | Propane | Propane | Propane | |
| Item Weight | 9.5 pounds | 9 pounds | 65 pounds | 2.99 pounds | ||
| Warranty Description | 1-Year Limited warranty | 1-Year Limited Warranty | 1-Year Limited Warranty | 1-Year Limited Warranty | ||
| Included Components | Heater, Owners' Manual | Portable Buddy Heater, Piezo Igniter | wind-resistant frame, safety shut-off valve, tip-over switch | |||
| Room Type | Living Room | Home Office | Living Room, Patio | Garage | ||
| Number of Speeds | 2 | 4 | 3 | |||