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If you have a spacious garage or need to raise the temperature significantly, you’ll need a heater with a larger blower and higher BTUs. This gas-powered Modine ceiling heater combines operating value, ease of use and reliability. According to Robertson, as a general guideline, a heater with an output of 20,000 to 30,000 BTUs is often suitable for a well-insulated two-car garage. With an impressive 45,000 BTUs, this model is sure to warm most garages while also conserving valuable floor space.  

This heater won’t have you playing outlet Tetris while operating corded power tools, either. Connect it to a programmable thermostat to maintain a cooler temperature overnight, and it kicks on only when you’re in the garage. Among the many positive reviews, one happy shopper writes: “Heater works excellent in a Wisconsin attached garage. Brings the temp up to 80 degrees in 15 minutes. Runs quiet and smooth.”

Pros

• Impressive 45,000 BTUs heats large spaces
• Low-profile design
• Highly durable
• Built for residential and commercial use

Cons

• Requires professional installation
• Pricey

Types of Garage Heaters

• Propane heaters: Portable and versatile, these heaters use propane gas for efficient heating in areas without electricity.
• Natural gas heaters: Connected to a gas line, these models provide a continuous and cost-effective heat source for larger areas.
• Electric heaters: These heaters are powered by electricity, efficient, easy to install and are suitable for smaller garages.
• Infrared heaters: Emitting radiant heat, infrared heaters warm objects directly, offering focused and energy-efficient heating.
• Forced air heaters: Utilizing a fan to distribute warm air, these heaters are effective for quickly heating larger garage spaces.
• Radiant tube heaters: Mounted on the ceiling, these units radiate heat downward, making them ideal for spot-heating specific areas.

What to Look for When Buying a Garage Heater

In addition to considering the size of your garage, it’s important to think about the following factors when looking for the best garage heater:

• Safety: Is your garage filled with flammable materials and wood dust? Is it so cramped you’ll be bumping into a heater that can be tipped over? Do kids or pets play there? Most heaters are safe if used properly, but look for additional safety features to suit your situation.
• Garage use: Will you be spending long hours at a workbench, or do you only need enough warmth to prevent the vehicle batteries from dying?
• Garage finish level: Is the garage fully insulated with drywall? Or is it uninsulated and drafty?
• Power source: Garage heaters are powered by propane, kerosene, natural gas or electricity (120-volt and 240-volt).
• Cost: The cost of the best garage heater is more than the number on the price tag. It’s important to also factor in fuel, installation and maintenance.
• Energy efficiency: Aside from considering the carbon footprint, this will largely determine the operating cost of the furnace.
• Sound/noise level: Noise can be a bigger factor than you might guess, especially for attached garages. How loud is the heater, and how often does it kick on?
• Installation: Garage heaters range from small mobile units to wall- or ceiling-mounted units fed by natural gas lines. Consider whether you’re comfortable with installing a garage heater on your own. If you’re not, then figure installation costs into your overall budget.

Why You Should Trust Us

The best garage heaters were hand-chosen by Dan Stout, a former residential remodeler, commercial site supervisor and maintenance manager. He’s worked on a wide range of areas in the building and DIY world, including project planning and permitting, basic electric and more.

For this article, we also got advice from Brad Roberson, the president of Aire Serv, a Neighborly company that provides HVAC services to residential and commercial clients. Aire Serv is a trusted name in the field of heating and air conditioning installation, maintenance and repair; and Robertson has almost 20 years of experience.

How We Found the Best Garage Heaters

Our best garage heater picks were selected by a former residential remodeler who worked on nearly all aspects of building and DIY, referencing reviews of dozens of different garage heaters and evaluating how they stack up in real-world conditions. Only those with exceptionally good consumer reviews made the cut. From there, those with the highest scores and most relevant benefits and features were chosen as winners. When a garage door insulation kit isn’t enough, the best garage heater comes to the rescue.

FAQ

What is the best kind of heater for a garage?

The best kind of heater for a garage is entirely dependent on the size of your garage and the severity of your winters. Consider all the factors listed above to determine the right model for your home. When in doubt, Robertson suggests consulting with a heating professional to help determine the most appropriate unit based on your specific needs.

What size heater do I need for my garage?

According to Robertson, the size of the heater you’ll need depends on factors like insulation, local climate and desired temperature. For climates with cold-to-moderate winters, here are some general guidelines to follow:

• Up to 250 square feet: 10,000 to 15,000 BTUs (gas), 5,000 to 7,000 BTUs (electric)
• 250 to 500 square feet: 15,000 to 30,000 BTUs (gas), 7,000 to 12,000 BTUs (electric)
• More than 500 square feet: 30,000 to 75,000 BTUs (gas), 12,000 to 20,000 BTUs (electric)

Are garage heaters safe?

Garage heaters can be safe if used properly and in accordance with manufacturer guidelines. It’s crucial to select a heater with safety features such as tip-over protection and overheat shut-off. Additionally, ensure proper ventilation in the garage to prevent carbon monoxide buildup. Regular maintenance, following safety instructions and keeping flammable materials away also contribute to a safer heating environment.

How do I install a garage heater?

While some individuals with technical proficiency may attempt to install a garage heater on their own, Robertson says it is generally recommended to hire a service professional to get the job done correctly. “Garage heaters involve electrical or gas connections, ventilation considerations and safety measures that require expertise to ensure proper installation, compliance with local codes and safe operation,” he says. “Professional installation helps prevent potential hazards and ensures optimal performance and efficiency of the garage heating system,” he adds.

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