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 4000 to 18000 BTU Portable LP Gas Heater is a versatile option for anyone looking to heat a larger space like a three-car garage. With adjustable heating levels of 4,000, 9,000, or 18,000 BTUs, it can effectively cover an area of up to 450 square feet, making it suitable for various settings, from garages to outdoor spaces. The propane fuel type adds convenience, especially for those who may have easy access to propane tanks. Its portability allows users to move it around as needed, whether for heating a garage or taking it outdoors for a picnic or camping.

Safety features are commendable, including an automatic shutoff in case it tips over and a low-oxygen safety shutoff, which is crucial for indoor use. Additionally, the simple control knob and reliable piezo start mechanism make it user-friendly.

There are some considerations to keep in mind. First, while the heater can connect to larger propane tanks, necessary components such as hoses and filters are not included, which could be an inconvenience for some users. Additionally, while the 18,000 BTU setting is quite powerful, it may still struggle in particularly cold climates or poorly insulated garages. The noise level is generally acceptable, but some users may find it noticeable, especially in enclosed spaces. Lastly, the heater is designed for portable use, meaning it may not be the most permanent solution for heating larger garages, where a more fixed installation could be preferred.