Quick Overview: This guide compares five popular Mr. Heater Propane Buddy models to help you choose a portable propane heater that fits specific spaces and uses. Below is a concise product summary to compare BTU ranges, indoor approval, and suggested coverage.
| Product | Brand | BTU Range / Output | Approx. Coverage | Indoor Safe |
|---|---|---|---|---|
| Portable Buddy MH9BX | Mr. Heater | 4,000–9,000 BTU | Up To 225 Sq. Ft. | Yes (Indoor-Safe) |
| 3-Setting Portable LP Heater | Mr. Heater | 4,000 / 9,000 / 18,000 BTU | Up To 450 Sq. Ft. | Indoor/Outdoor Approved |
| Big Buddy Pro Series 18,000 BTU | Mr. Heater | 4,000–18,000 BTU | Up To 450 Sq. Ft. | Indoor/Outdoor Approved |
| Little Buddy MH4B 3,800 BTU | Mr. Heater | 3,800 BTU | Up To 95 Sq. Ft. | Indoor Safe |
| Hunting Buddy MH12HB | Mr. Heater | 12,000 BTU | Up To 300 Sq. Ft. | Indoor/Outdoor Approved |
Mr. Heater Portable Buddy Heater MH9BX
The MH9BX Portable Buddy offers adjustable output from 4,000 to 9,000 BTU, making it suited for small rooms, campers, and workspaces up to about 225 square feet. The unit uses infrared radiant heat to warm objects and people directly rather than just heating the ambient air.
Key safety and usability elements listed include an improved tip-over safety switch that engages audibly if the unit is bumped or tipped and a durable Piezo igniter for matchless start-up. The combination of radiant output and safety features positions this model for enclosed spaces where direct, targeted warmth is preferred.
Mr Heater 3-Setting Portable LP Heater Unit
This three-setting propane heater provides 4,000, 9,000, or 18,000 BTU, with a stated heat range up to 450 square feet when configured for higher output. It supports larger disposable tanks or remote supply using an optional hose and filter, allowing extended run times and flexibility for different sites.
The model highlights a single control start knob with a piezo spark mechanism and an automatic safety shutoff in the event of a tip-over. This multi-output option is suitable for users who need both compact camping warmth and higher output for garage, job site, or larger enclosed areas.
Mr. Heater 18,000 BTU Big Buddy Pro Series
The Big Buddy Pro Series delivers up to 18,000 BTU with a variable range down to 4,000 BTU, rated for spaces as large as 450 square feet. It is noted for clean-burning and high efficiency with built-in protections including tip-over, pilot failure, and low-oxygen automatic shutoff.
Use cases include large RV interiors, workshops, and enclosed patios where higher output is needed. The documentation also notes altitude considerations: units may shut off over specific elevations due to ODS sensitivity, so altitude compatibility should be checked for high-elevation applications.
Mr. Heater F215100 MH4B Little Buddy 3800-BTU
The MH4B Little Buddy is a compact indoor-safe heater rated at 3,800 BTU, designed for small spaces such as tents or personal areas up to about 95 square feet. It features an ODS (oxygen depletion system) and tip-over safety shutoff for enclosed use.
Runtime is noted at roughly 5.6 hours on a 1-pound cylinder at full output, making it a lightweight option for short-term indoor or small-cabin heating. The Little Buddy is intended where minimal, targeted warmth and portability are the priority.
Mr. Heater MH12HB Hunting Buddy Portable Heater
The Hunting Buddy MH12HB provides 12,000 BTU and is marketed for blinds, campsites, and similar outdoor/indoor hybrid situations up to 300 square feet. The unit includes a swivel regulator for flexible tank options and safety features such as ODS and tip-over shutoff.
Its camo finish and focus on field use make it suitable for hunting blinds and remote outdoor shelters that still require reliable, controlled heat. As with other models, altitude performance and ventilation requirements are noted for safe operation.
Buying Guide: Choosing The Right Propane Buddy Heater
When evaluating propane Buddy heaters, consider the use case first: personal warmth in a small enclosed space, supplemental heat for a workshop, or heating a hunting blind or RV. Each scenario has different priorities: output, safety systems, fuel options, and portability.
Heat Output And Coverage
BTU ratings indicate theoretical output but actual coverage varies with insulation, outside temperature, and room layout. For direct, close-range warmth in small tents or cabins, 3,800–9,000 BTU models are often sufficient. For larger enclosed spaces like garages or bigger RVs, multi-setting units that reach 18,000 BTU provide more consistent comfort.
Indoor-Safe Certifications And Safety Features
Key safety features to prioritize include:
- Oxygen Depletion Sensor (ODS) — shuts the unit off if oxygen drops to unsafe levels.
- Tip-Over Protection — automatic shutoff if the heater is bumped or falls.
- Pilot/Flame Failure Shutoff — stops fuel flow if the pilot or flame extinguishes.
Models explicitly labeled indoor-safe include ODS and meet design standards for enclosed spaces, but proper ventilation remains essential. Review manufacturer guidance on altitude limits, since ODS systems can trigger at high elevations.
Fuel Source And Runtime
Check whether the heater is designed for small disposable cylinders only or if it supports larger tanks or remote supply via a hose and filter. Smaller disposable cylinders provide portability and simplicity, while larger tanks or remote supply increase runtime and reduce refill frequency. If extended runtime is important, choose models with dual fuel compatibility or optional hose assemblies.
Ignition And Controls
Many Buddy heaters use a Piezo igniter for matchless starts. Simple, intuitive controls — such as a single control knob with multiple heat settings — help with reliable operation. Look for clear control labeling and a fold-down handle or integrated carrying solution for transport.
Portability And Build
Consider unit weight, handle design, and footprint. Hunting and camping units may offer camouflage finishes or brackets for mounting. If you plan to move the heater frequently, a compact model with a low center of gravity reduces tip risk. For workshop use, a heavier, more stable base and larger heating surface may be preferable.
Efficiency And Heat Type
Propane Buddy heaters commonly provide radiant heat, which warms objects and people directly rather than first heating the air. Radiant heat is efficient for close-range comfort and intermittent use. For whole-room heating over longer periods, pairing radiant units with insulated spaces and wind protection improves effectiveness.
Altitude And Environmental Considerations
ODS-equipped heaters can behave differently at higher elevations. Manufacturers often note an altitude cutoff where the unit may shut down; confirm compatibility if operating above typical sea-level conditions. Additionally, avoid use in areas with flammable vapors or confined spaces without ventilation.
Maintenance, Accessories, And Upgrades
Regularly inspect fuel connections, valves, and the combustion surface for buildup. Optional accessories such as longer hoses, tank adapters, or fan kits can increase versatility. If you need directed airflow distribution, consider a thermoelectric fan compatible with the heater to move warmed air more effectively.
Comparison Perspectives
- Small Personal Use: Choose compact models like the Little Buddy for tents or small rooms where portability and low output are priorities.
- Versatile Multi-Use: Three-setting or multi-output models offer flexibility for both camping and larger enclosed spaces.
- High Output Needs: Big Buddy and 18,000 BTU-rated units provide coverage for larger enclosed areas, garages, or extended RV use.
- Field/Hunting Applications: Hunting Buddy models focus on portability, camouflage, and the ability to adapt to different fuel sources.
When comparing models, weigh safety certifications, BTU versatility, fuel options, portability, and environmental constraints. Match the heater’s documented coverage and safety features to your intended environment and operating conditions to ensure reliable, compliant operation.