Quick Overview: The following guide compares five relevant propane and gas heating options for overhead, wall, and indoor/outdoor use, plus an ignition control board used in many overhead unit heaters. The selections cover high-output overhead units, vent-free wall heaters, portable propane units that can serve garages and patios, and replacement control circuitry for overhead furnace systems.
| Product | Type | Output / Coverage | Primary Use |
|---|---|---|---|
| Mr. Heater Big Maxx MHU80NG | Overhead Unit Heater (Natural Gas) | 80,000 BTU • Up To 2,000 Sq. Ft. | Large Garages, Workshops, Commercial Spaces |
| 60105 Ignition Control Board PCB | Replacement Control Board | Supports Up To 125,000 BTU Units | Repair/Maintenance For Overhead Heaters |
| Dyna-Glo IR30PMDG-1 Wall Heater | Vent-Free Infrared Wall Heater | 6,000–30,000 BTU • Up To 1,000 Sq. Ft. | Wall-Mounted Garage Or Shop Heating |
| Mr. Heater Portable 4,000–18,000 BTU | Portable LP Heater (Dual Tank) | 4,000–18,000 BTU • Up To 450 Sq. Ft. | Portable Garage, Workshop, Outdoor Use |
| OKF Propane Heater Indoor/Outdoor | Indoor/Outdoor Propane Heater | 6,000/12,000/18,000 BTU • Up To 450 Sq. Ft. | Garage, Camping, Patio, Backup Heat |
Mr. Heater Big Maxx MHU80NG 80,000 BTU
Intended Use: Heavy-duty overhead natural gas unit heater designed for large garages and workshops.
Key Features: Includes the heater with two angle brackets and an LP conversion kit; rated at 80,000 BTU and listed coverage around 2,000 sq. ft. The unit requires 120 V power for the fan and electronics and specifies clearances for safe mounting.
Installation Notes: This model supports category 1 vertical and category 3 horizontal venting. Thermostat, hose, and regulator are not included, and installation should follow local codes. The product dimensions are provided for planning overhead clearance and placement.
60105 Ignition Control Board For Heaters
Intended Use: Replacement ignition control board compatible with compact overhead furnaces and unit heaters.
Key Features: New OEM-style 6-pin control board compatible with Mr. Heater, HeatStar, Big Maxx, and Enerco overhead propane and natural gas heaters under 125,000 BTU. Designed as a 24‑volt replacement circuit board for MHU and HSU series units.
Application Notes: This component is for troubleshooting or restoring ignition systems in overhead heaters. Proper diagnosis and electrical testing are required before replacement. Use only compatible boards as specified by the manufacturer to preserve safety certifications.
Dyna‑Glo IR30PMDG‑1 30,000 BTU Wall Heater
Intended Use: Vent‑free infrared wall heater suitable for garages, shops, or supplemental room heat.
Key Features: Infrared Technology that radiates heat to warm objects and people directly, with a variable output up to 30,000 BTU. Designed for liquid propane operation and rated to heat spaces up to about 1,000 sq. ft.
Installation Notes: Vent‑free units must be installed according to local building codes and manufacturer clearances. Since this model is vent‑free, it depends on room ventilation and may include oxygen depletion safeguards in certain configurations; check local regulations for indoor propane appliance use.
Mr. Heater 4,000–18,000 BTU Portable LP Heater
Intended Use: Versatile portable propane heater for garages, workshops, camping, and patios with optional dual tank connection for extended run times.
Key Features: Variable heat settings of 4,000, 9,000, or 18,000 BTU. Can support larger propane tanks (up to 40 lbs) with an additional hose and filter for longer operation and coverage up to about 450 sq. ft. Single-knob control with piezo ignition and automatic tip-over safety shutoff.
Practical Notes: While portable, this heater can be a practical supplemental heat source in workshops when overhead units are not needed or available. Follow indoor-use guidelines and keep ventilation and clearance in mind for safe operation.
OKF Propane Heater Indoor And Outdoor 6,000–18,000 BTU
Intended Use: Indoor/outdoor propane heater with multiple heat settings and safety cutoffs for garages, camping, and patio use.
Key Features: Three heat modes: 6,000, 12,000, and 18,000 BTU. Equipped with pulse ignition, provided gas regulator and hose for a 20 lb propane tank, and dual safety features including oxygen depletion sensor (ODS) and tip‑over protection. Manufacturer claims up to 450 hours runtime on low in some configurations.
Operational Notes: Pulse ignition differs from piezo systems and can offer more reliable starts. The built-in safety features are relevant when using propane appliances indoors or in semi-enclosed spaces like garages.
Buying Guide: Choosing The Right Overhead Or Garage Propane Heater
This buying guide covers the primary factors to evaluate when selecting a heating solution for garages, workshops, and similar spaces. It presents multiple comparison perspectives including output, fuel compatibility, venting, safety, installation, and long‑term maintenance.
Heat Output And Coverage (BTU)
BTU Rating indicates the heater’s thermal output. For enclosed garages and workshops, calculate cubic footage (length × width × height) and consider insulation. Higher BTU units (30,000–80,000+) are common for overhead or unit heaters for larger spaces. Portable units with 4,000–18,000 BTU are for smaller areas or supplemental heat.
Fuel Type: Propane vs Natural Gas
Fuel Compatibility matters for installation and running costs. Many overhead units are available in natural gas or convertible kits. Propane offers portability and ease of setup with tanks, while natural gas provides continuous supply if connected to mains. Confirm whether a unit is liquid propane ready or requires conversion.
Vented, Vent‑Free, And Infrared Options
Vented Units exhaust combustion products outdoors and are used where indoor air quality must be preserved. Vent‑free (ventless) models radiate heat without direct venting but require adequate ventilation and may be restricted by codes. Infrared heaters warm objects directly and can feel warmer at lower air temperatures, which is effective in high ceilings or open bays.
Mounting Style: Overhead, Wall, Or Portable
Overhead Unit Heaters provide widespread heat for large footprints and are typically hardwired and vented. Wall‑mountedheaters save floor space and can be vent‑free or direct‑vent. Portablepropane heaters are flexible and useful for temporary or supplemental heating but require clearance and ventilation rules when used indoors.
Installation And Clearance Requirements
Follow manufacturer clearances for ceiling, wall, and floor distances. Overhead and direct‑vent units require proper vent routing and sometimes certified professional installation. Local building codes may require permits or limit vent‑free propane use in enclosed residential spaces.
Safety Features And Certifications
Look for tip‑over protection, oxygen depletion sensors (ODS), flame failure devices, and thermal cutoffs. For overhead systems, ensure the unit has relevant UL or CSA listings and that any replacement parts (like control boards) match OEM specifications to maintain safety approvals.
Controls, Thermostats, And Zoning
Thermostat-ready heaters allow automated temperature control and can improve efficiency. Some overhead units support external thermostats, while portable heaters rely on built-in controls. Consider zoning needs: multiple smaller heaters or a single larger overhead unit may better match usage patterns.
Durability, Materials, And Corrosion Resistance
For unconditioned spaces, choose units with corrosion‑resistant headers, stainless components, and durable finishes. Outdoor‑exposed or semi‑open garages benefit from rust‑resistant materials and sealed fans or motors.
Maintenance And Replacement Parts
Evaluate serviceability and parts availability. Overhead units typically have blower motors and control boards that may require replacement; ensure replacement parts such as ignition control boards are available. Routine maintenance includes burner inspection, vent checks, and motor lubrication per manufacturer guidance.
Noise, Air Circulation, And Comfort
Overhead forced‑air units include fans that circulate warm air but may produce noise. Infrared models are quieter but rely on radiant heat and may not mix air as quickly. Consider whether air movement or silent operation is a higher priority for your workspace.
Operational Costs And Tank Management
While this guide avoids price specifics, consider fuel consumption relative to BTU output and duty cycle. Propane tanks require refill logistics; dual tank setups or natural gas conversions reduce downtime but involve additional plumbing or hose accessories.
Regulatory And Code Considerations
Local codes may restrict vent‑free propane appliances in certain areas. Garages attached to occupied living spaces may have special requirements for combustion equipment. Consult local building departments and follow the heater’s installation manual strictly.
Choosing By Use Case
- Large Commercial Garage/Workshop: Overhead unit heaters with high BTU output and proper venting (example: high‑BTU MHU series).
- Residential Attached Garage: Wall or vented heaters with safety sensors; check local code for vent‑free allowance.
- Temporary Or Supplemental Heat: Portable LP heaters with tip‑over protection and dual tank options for extended runtime.
- Retrofit And Repair: OEM control boards and replacement parts are important for restoring overhead units to safe operation.
Comparison Perspectives
Overhead vs Wall: Overhead units distribute heat across larger floor areas and free up wall/floor space. Wall units are easier to install and service in smaller bays.
Portable vs Fixed: Portable heaters are flexible for variable work zones but are not a substitute for permanently installed overhead systems when consistent, whole‑space heat is required.
Propane vs Natural Gas: Propane provides mobility and high energy density per tank; natural gas suits continuous, permanent installations with steady supply.
Infrared vs Convection: Infrared heats objects directly and is effective in high or drafty spaces; convection (forced air) warms air and evenly distributes temperature but may be less efficient in very high ceilings.
Professional Installation And Troubleshooting
For overhead and vented systems, consider professional installation to ensure proper venting, gas connections, and electrical wiring. Common troubleshooting points include ignition board failure, blocked venting, faulty thermostats, and insufficient clearance. Use factory replacement parts when repairing controls or burners.
Final Note: Match the heater’s BTU, venting type, and safety features to your space and local codes. When in doubt, consult a certified HVAC or gas‑appliance technician to verify suitability and ensure safe, code‑compliant installation.