10 Best Garage Heaters 2026 in the United States

The Rinnai EX38DTN is a natural gas-powered, wall-mounted heater that offers a strong heating capacity of 38,400 BTUs, making it suitable for warming medium-sized indoor spaces like bedrooms, home offices, or study rooms. Its direct vent design ensures efficient and safe combustion by expelling fumes outside, which is particularly important for indoor use. One of the heater’s standout features is its advanced modulating technology, which keeps the room temperature steady and avoids cold spots, providing consistent comfort. The programmable thermostat and Wi-Fi compatibility add convenience, allowing you to set and maintain the temperature easily according to your schedule.

Safety is well addressed with a cool-to-the-touch cabinet and self-diagnostic electronics, making it a family-friendly option. The unit is also designed to be energy-efficient, adjusting fuel use to meet heating needs without wasting energy, which can help save on gas bills. Installation requires wall mounting, which helps save floor space but might limit portability if you need to move the heater frequently. At about 108 pounds and with dimensions over 3 feet wide, it’s a sizable unit, so it’s best suited for a permanent spot rather than quick relocation.

The heater offers quiet operation and a long warranty on parts and labor, and it is intended primarily for indoor use, which might make it less practical for garage spaces that are large, poorly insulated, or require more rugged, portable heating solutions. The Rinnai EX38DTN is a strong choice for homes seeking an efficient, safe, and smart-controlled natural gas heater that provides reliable warmth without noise or space intrusion.

The Rinnai EX22DTWP is a wall-mounted propane heater designed to efficiently warm indoor spaces up to around 1,600 square feet. With a heating capacity of about 20,700 BTUs, it provides consistent and even warmth thanks to advanced modulating technology that adjusts heat output to your needs, helping avoid cold spots and saving fuel. Since it runs on propane gas, it doesn't rely on electricity for heat, which can be a plus in areas where electric power might be limited, although it does use 60 volts for controls and ignition.

Safety features are well thought out, with a cool-to-the-touch cabinet to protect against burns and self-diagnostic electronics to ensure reliable operation—good for households with kids or pets. The heater also includes a programmable thermostat that can be controlled manually or integrated with Wi-Fi systems for added convenience and comfort management. Installation requires wall mounting, which saves floor space and suits modern homes or garages with limited room.

At 67 pounds and sizable dimensions, it needs a sturdy wall and professional installation, which might be a consideration for some users. This model is focused on indoor use and may not be ideal for outdoor or unventilated garage spaces. Warranty coverage is strong, offering up to 10 years on the heat exchanger, reflecting confidence in durability. This heater serves as a reliable and efficient choice for those looking to heat specific rooms or well-ventilated indoor garages, especially if precise temperature control and a compact, wall-mounted design are priorities.

The Rinnai EX11DTN is a natural gas wall-mounted heater designed to efficiently warm indoor spaces up to about 1600 square feet, making it suitable for garages, bedrooms, or home offices. It delivers a steady 11,000 BTUs of heat using radiant and forced air methods, which helps avoid cold spots and keeps the room evenly warm. The heater is powered by natural gas, which can be cost-effective for continuous use compared to electric models. Safety is a strong point with a cool-to-touch exterior and built-in self-diagnostic electronics, making it a safe choice for households with kids.

The programmable thermostat, compatible with Wi-Fi systems, allows you to set comfortable temperatures ahead of time, adding convenience and helping save energy by adjusting heat as needed. Installation is wall-mounted, so it saves floor space and fits well in modern or smaller rooms; however, it requires a direct vent setup, meaning it needs proper venting to the outside. It’s fairly compact and quiet in operation, which is beneficial for maintaining a peaceful environment.

Being gas-powered means it must be connected to a natural gas supply and professionally installed, which might not be as simple or portable as electric heaters. The long warranties on parts and heat exchanger demonstrate confidence in durability. For those seeking an energy-efficient, safe, and steady heater for an indoor garage or similar space, especially with natural gas availability, this Rinnai heater represents a solid choice.