Choosing a propane (LP) unit heater for garages, workshops, or shops requires evaluating BTU output, venting options, installation flexibility, and durability. The following picks represent a mix of residential and commercial LP or natural gas models that balance performance with practicality. Each product summary includes key specs and features to help you compare at a glance.
| Product | BTU | Fuel | Best For |
|---|---|---|---|
| Mr. Heater Big Maxx MHU50NG | 50,000 | Natural Gas | Medium garages and workshops |
| Mr. Heater Big Maxx MHU80NG | 80,000 | Natural Gas | Larger spaces up to 2000 sq ft |
| Reznor UDXC-45 | 45,000 | LP Gas | Ceiling-mounted or garage spaces |
| Reznor UDXC-30 | 30,000 | LP Gas | Smaller shops and garages |
| Reznor UDXC-150 | 150,000 | LP Gas | Large garages and industrial spaces |
Mr. Heater Big Maxx MHU50NG — Natural Gas Unit Heater
The Mr. Heater F260550 Big Maxx MHU50NG delivers 50,000 BTU per hour, heating areas up to 1,250 square feet. Its powered exhaust supports vertical or horizontal venting for flexible installation. The exterior thermostat access and gas connection make servicing straightforward from outside the living or work area. This unit is suitable for mid-size garages, workshops, or basements where reliable, continuous heat is needed without overhead ductwork.
Mr. Heater Big Maxx MHU80NG — 80,000 BTU Natural Gas Unit Heater
This 80,000 BTU unit is designed for larger spaces, with coverage up to 2,000 square feet. The package includes one Mr. Heater Big Maxx natural gas heater with two angle brackets and a liquid propane conversion kit. Note that thermostat, hose, and regulator are not included. It measures about 29.33 inches long by 15.50 inches wide and 26.37 inches tall, offering robust performance for open-plan garages or workshop areas where higher heat output is beneficial.
Reznor UDXC-45 — 45,000 BTU Gas Unit Propane Heater
The UDXC-45 from Reznor is a 45,000 BTU indoor propane heater suited for garages, workshops, warehouses, or factories. It supports ceiling-mount or wall-mount configurations (mounting hardware sold separately) with four suspension points. It achieves high thermal efficiency and is compatible with indoor use in various commercial or industrial spaces, offering a compact option where ceiling space is available.
Reznor UDXC-30 — 30,000 BTU Propane Garage Heater
The 30,000 BTU Reznor UDXC-30 is ideal for smaller shops or garages and shares the indoor-use design seen in other UDXC models. It offers similar mounting versatility and a focus on energy efficiency for spaces that do not require the higher output of larger units, while still providing steady, forced-air warmth.
Reznor UDXC-150 — 150,000 BTU LP Gas Heater
The Reznor UDXC-150 raises the heat output to 150,000 BTU, making it suitable for large garages, warehouses, and industrial spaces that require high-capacity propane heating. Like other UDXC units, it is designed for ceiling-mount or ceiling-based installation with mounting hardware sold separately. The unit emphasizes efficient combustion and consistent forced-air delivery for expansive areas.
Reznor UDXC-100 — 105,000 BTU LP Gas Heater
The UDXC-100 delivers 105,000 BTU for mid-to-large spaces, combining efficient performance with the flexibility of ceiling-mount installation. It serves spaces that require dependable warmth without large ductwork, suitable for workshops, warehouses, and manufacturing floors where ceiling-height options are available.
Buying Guide
Purchase considerations for LP and natural gas unit heaters focus on space size, mounting location, and venting requirements. First, verify the space to heat in square feet and choose a model with adequate BTU output plus a margin for cold snaps. Ceiling-mount models can free floor space in crowded garages but may require taller ceilings and proper clearance. Venting options matter: vertical and horizontal venting enable flexible installation across different building designs, but ensure ductwork and exhaust routing comply with local codes.
Fuel and efficiency are paramount. Natural gas units typically offer steady operation with familiar supply lines, while LP models are ideal where natural gas is not readily available. Look for units with high thermal efficiency ratings and good compatibility with existing thermostats or smart controls. Accessibility of the thermostat and gas connections can simplify servicing, while external access panels reduce the need to dismantle walls for adjustments.
Installation considerations also include clearances, mounting hardware, and required space around the heater for safe operation and air circulation. Some units include brackets or conversion kits, while others rely on separate components (thermostats, hoses, regulators). Assess your comfort level with electrical and gas line work, or plan to hire a licensed professional for safe connection and venting. Finally, consider future needs: a higher-BTU unit may be worth choosing if you anticipate space expansion or longer heating seasons.
Durability and noise are other factors. Industrial models tend to be designed for robust operation with steady airflow, while residential lines emphasize quieter performance. Evaluate warranty terms and service availability in your area, especially for larger commercial units that may require periodic maintenance or professional calibration for peak efficiency.
In short, align BTU requirements with space, ensure venting compatibility, and choose a model that fits your installation site while offering reliable operation and straightforward maintenance. The options listed here cover a range from compact, moderate-heating units to high-capacity heaters suitable for expansive spaces.