10 Best Garage Heater For 3 Car Garage 2025 in the United States

The Dr Infrared Heater DR-238 is a versatile option for heating spaces like a three-car garage, boasting the ability to function both indoors and outdoors. With a heating capacity of up to 1500 watts, it offers three power settings (900W, 1200W, and 1500W) to cater to different heating needs. This flexibility makes it suitable for chilly garage environments where quick and instant warmth is desired. Its clean, odorless infrared technology ensures that it won't disrupt the air quality, which can be a plus for enclosed spaces.

Safety is a notable feature with this heater, as it is IP55 rated for water and dust resistance, which enhances durability and makes it a good fit for environments exposed to the elements. The inclusion of mounting brackets allows for wall or ceiling installation, optimizing space in a garage setup. The remote control adds convenience, enabling users to adjust settings without needing to get up.

In summary, the Dr Infrared Heater DR-238 offers solid features for heating a garage, especially for those looking for an easy-to-use, efficient electric option. However, it might not be the best choice for more extensive or poorly insulated garages.

The Mr. Heater Portable Buddy Heater MH9BX offers a heating capacity of 4,000 to 9,000 BTUs, which is suitable for small areas up to 225 sq. ft. This makes it less ideal for a 3-car garage, which typically requires a higher BTU output for effective heating. The fuel type is propane, which is convenient and offers flexibility with either a 1 lb. cylinder or a 20 lb. tank (with optional accessories).

Installation is straightforward as it is a portable, floor-mount device that does not require any assembly. Safety features are robust, including an improved tip-over safety switch and a low-oxygen shut-off system, which ensures safe usage. The thermostat control is manual, offering two settings for heat adjustment, but lacks a precise temperature control.

Noise levels are minimal due to its radiant heating method, making it a quiet option. This heater is reliable, portable, and safe, but its heating capacity might be insufficient for a larger space like a 3-car garage. It would be more suitable for smaller enclosed areas such as workshops, patios, or single-car garages.

The Mr. Heater F260560 Big Maxx MHU80NG is designed to effectively heat large spaces such as a 3-car garage, boasting an impressive heating capacity of 80,000 BTUs. This unit can cover a significant area of up to 2,667 square feet, making it suitable for larger garages. One of the key strengths is its versatility in venting options, as it supports both vertical and horizontal configurations, which can be particularly beneficial depending on your garage setup.

Using natural gas as its fuel type, this heater can provide efficient and cost-effective heating, which is especially advantageous for long-term use. Its installation is straightforward, thanks to the included ceiling mounting brackets and the conversion kit for liquid propane, although you will need to acquire a thermostat, hose, and regulator separately.

Safety features are addressed with a high-temperature safety shut-off, ensuring peace of mind during operation. The heater also has self-diagnostic capabilities through its spark ignition system, which adds to its reliability. However, there are some drawbacks to consider. One is the noise level; powered exhaust systems can sometimes generate noise, which may be a concern if you're looking for a quieter heating solution. Additionally, while the heater is designed for indoor use, it might require adequate ventilation to ensure safety and efficiency. Assembly is required, which may be a hurdle for some users who prefer a plug-and-play solution.