Best Propane Ceiling Heater for Garage: Top Unit Heaters and Options

Choosing the right propane garage heater depends on space, mounting, ventilation, and safety features. Below is a compact summary table of the five selected units reviewed in this guide to help you compare key specs at a glance.

Product	Type	Max BTU	Coverage Notes
Mr. Heater Propane Unit Heater MHU80LP	Ceiling/Unit Heater	80,000 BTU	Up To ~1,000 Sq. Ft. (manufacturer)
Reznor UDXC-60 LP	Ceiling Mount Propane Unit	60,000 BTU (two levels)	Commercial/Workshop Use, 83% Efficiency
Mr. Heater Big Maxx MHU80NG (Includes LP Conversion Kit)	Unit Heater (Natural Gas Base / LP Kit)	80,000 BTU	Coverage Up To 2,000 Sq. Ft. (NG spec)
Reznor UDXC-45	Ceiling/Wall Unit (NG base)	45,000 BTU	Two Output Levels, 83% Efficiency
Mr. Heater MHVFBF20LPT Blue Flame Vent Free	Propane Wall Heater (Vent-Free)	20,000 BTU	Vent-Free For Enclosed Rooms Up To ~700 Sq. Ft.

Mr. Heater Propane Unit Heater 80,000 BTU/Hr. MHU80LP

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This Mr. Heater model is explicitly designed as a propane unit heater for garages and workshops and lists an 80,000 BTU capacity. Manufacturer features include spark ignition with a self-diagnostic control module and included angle brackets for ceiling mounting. The product spec lists intended coverage of up to 1,000 square feet, making it suitable for medium to large garages depending on insulation and climate.

Installation considerations: the unit is designed for ceiling mounting using the included brackets and requires proper fuel hookup and venting per local code. The ignition system simplifies startup, and the included mounting hardware reduces installation complexity. Keep in mind that clearances and gas supply pressure must meet the manufacturer’s guidelines for safe operation.

Reznor 60,000 BTU Gas Unit Propane Garage Heater UDXC-60

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The Reznor UDXC-60 is presented as a high-performance indoor gas heater that supports propane operation and targets commercial and residential garages. It lists a maximum rating of 60,000 BTU with dual heating levels (low fire and high fire) and an 83% thermal efficiency. The UDXC series is configured for ceiling suspension with four threaded-nut retainers for secure mounting.

Design notes: the UDXC includes a low static propeller fan for forced-air distribution and is built for continuous operation in workshop or warehouse environments. Mounting hardware may be sold separately depending on the configuration, so verify suspension components for ceiling installations. The two-stage output can provide flexibility in runtime and fuel consumption on milder versus colder days.

Mr. Heater Big Maxx MHU80NG Natural Gas Heater (LP Conversion Kit Included)

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This Big Maxx unit is supplied as a natural gas heater but the listing notes an included Liquid Propane conversion kit, making it adaptable for propane-fed garages if conversion is performed per instructions. It lists 80,000 BTU performance and manufacturer coverage up to 2,000 square feet when configured for natural gas, with listed voltage, amps, and clearance requirements.

Installation and compatibility: the package includes two angle brackets for mounting; thermostat, hose, and regulator are not included. Because this model is designed for category 1 vertical and category 3 horizontal venting, ensure your intended installation meets venting clearances and local fuel conversion codes. Conversion to LP requires following the kit and code requirements for safe operation.

Reznor 45,000 BTU Unit Natural Gas Heater UDXC-45

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The Reznor UDXC-45 is a lower-output model in the same family as the UDXC-60, offering 45,000 BTU with two heating output levels and an 83% efficiency rating. Although listed as a natural gas unit, the UDXC platform is commonly available in propane-compatible configurations—verify the specific listing and conversion options when selecting a propane installation.

Applications: the UDXC-45 is suitable for smaller garages, hobby shops, or sectionalized spaces where zoned or lower output heating is sufficient. The ceiling or wall mount capability and forced-air fan provide flexible placement for targeted area heating. As with other gas unit heaters, correct venting, suspension points, and compliance with local codes are essential.

Mr. Heater MHVFBF20LPT 20,000 BTU Blue Flame Vent Free Propane Heater

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This Mr. Heater blue flame model is a vent-free propane wall heater rated at 20,000 BTU for indoor rooms and cabins. It includes an electronic ignition and a thermostat for temperature control and lists an Oxygen Depletion Sensor (ODS) for safety. The product is intended for enclosed spaces up to approximately 700 square feet depending on insulation and layout.

Considerations: vent-free units do not require flue venting but rely on adequate indoor air quality and room sizing. They are often used where ceiling-mount or vented installations are impractical, but local codes and insurance rules vary on vent-free appliance use in garages. Verify suitability for garage applications before selection; ensure CO and combustion air concerns are managed per code.

Buying Guide: How To Choose A Propane Ceiling Heater For Your Garage

Selecting a propane ceiling heater for a garage requires assessing heat load, mounting type, ventilation, safety features, and fuel setup. The following considerations will help you evaluate units and installation needs across multiple comparison angles.

1. Heating Capacity And Room Size

Calculate required output in BTU by estimating the garage volume, insulation level, and desired temperature rise. Many manufacturers provide approximate coverage (square feet) under ideal conditions. For rough guidance, high-capacity garages typically need 40,000–80,000 BTU for moderate climates; heavily insulated or smaller garages can use less. Always consult the heater’s specific coverage guidance and consider local climate.

2. Ceiling Mount vs Wall Mount vs Vent-Free

Ceiling-mounted unit heaters (suspended or bracketed) distribute forced warm air downward and keep floor space clear. They often require venting and a gas connection sized for demand. Wall-mounted vent-free units are simpler to install and don’t need a chimney but introduce combustion products into the space and may be restricted by code in garages. Decide based on garage layout, available ceiling structure for secure suspension, and local code restrictions.

3. Fuel Type, Conversion Kits, And Gas Supply

Confirm that the unit is rated for propane (LP) or that a manufacturer-approved LP conversion kit is available. Conversion must follow the instructions and local codes. Ensure adequate propane supply pressure and regulator sizing. For higher-BTU units, verify that your propane line and fittings can handle supply requirements without pressure drop during peak demand.

4. Venting And Combustion Air

Vented unit heaters require properly sized chimneys or vent ducts depending on category rating. Some units list category 1 vertical or category 3 horizontal venting; ensure your installation path complies with those ratings. Inadequate venting can create safety and efficiency issues. For vent-free appliances, provide adequate makeup air and heed local regulations about allowing these in garages.

5. Efficiency, Two-Stage Operation, And Controls

Higher thermal efficiency means more heat delivered to the space per unit of fuel. Look for models offering two-stage or modulating output to reduce cycling, improve comfort, and conserve fuel on milder days. Built-in thermostats, electronic ignition, and compatibility with remote thermostats improve control and usability.

6. Safety Features And Clearances

Key safety features include an ODS (Oxygen Depletion Sensor), tip-over protection on portable or wall units, and automatic shutoffs for ignition failure. Respect manufacturer-specified clearances—especially vertical clearance from floor to base for ceiling units—and ensure combustible material clearance around discharge areas. Follow local electrical and gas codes for shutoff valves, bonding, and vent termination locations.

7. Noise, Air Distribution, And Fan Type

Ceiling unit heaters generally use propeller fans or low-static blowers. For quieter operation in a home garage, check fan noise specs if available. Consider airflow pattern—downward forced air will heat floors and vehicles faster, while broader circulation may require ducting or additional fans for even distribution.

8. Installation Complexity And Mounting Hardware

Some units include angle brackets and suspension hardware, while others require separately purchased mounting kits. Ceiling structure must support the heater weight and vibration. Installation may require certified gas line work, electrical hookups for ignition, and experienced HVAC technicians for venting and testing. Budget for professional installation if you’re unsure about codes or complex venting.

9. Local Codes, Insurance, And Indoor Air Quality

Garage installations are subject to local building codes and often have restrictions (especially for vent-free units) due to vehicle storage and potential for fuel/chemical vapors. Check with local authorities and your insurance carrier before choosing a vent-free or in-garage combustion appliance. Consider CO detectors and proper ventilation strategies to preserve indoor air quality.

10. Long-Term Operating Costs And Maintenance

Compare expected fuel consumption across output levels and efficiency ratings rather than just peak BTU. Regular maintenance—cleaning burners, checking ignition systems, and verifying venting integrity—keeps units operating safely and efficiently. Two-stage models can reduce runtime and fuel consumption by matching output to heat demand.

By weighing these factors—capacity, mounting type, conversion and venting, controls, safety, installation needs, and local regulations—you can select a propane-compatible ceiling heater that fits your garage layout and use case. Always follow manufacturer instructions and local code requirements when installing gas-fired appliances.