10 Best Propane Heaters For Indoor Use 2025 in the United States

The Mr. Heater 18,000 BTU Big Buddy Pro Series Portable Propane Heater is a solid option for those looking to heat indoor and outdoor spaces up to 450 square feet. One of its greatest strengths is its versatility, with a heating range from 4,000 to 18,000 BTUs, making it suitable for various environments—from garages to living areas. Its clean-burning, nearly 100% efficiency is a bonus for users concerned about indoor air quality. Safety features are impressive, including auto shut-off if tipped over, pilot light extinguishes, or low oxygen levels are detected, which adds peace of mind, especially for indoor use. The heater is also portable, which means it can easily be moved to different locations as needed.

However, there are some drawbacks to consider. Although the heater is designed for indoor use, it still requires proper ventilation, which could be a limitation in certain scenarios. Additionally, operating at high altitudes (above 7,000 feet) can cause the heater to shut off, potentially frustrating users in mountainous areas. While the adjustable thermostat control is a useful feature, the recent removal of the fan on some models may affect performance, especially in larger spaces where air circulation is needed.

Another point to note is the requirement for D batteries to operate, which might be an inconvenience for some. Finally, the warning against using unauthorized accessories can be a concern for those looking to customize or extend functionality.

The Mr. Heater Portable Buddy Heater MH9BX is a versatile propane heater that delivers between 4,000 and 9,000 BTUs, making it suitable for spaces up to 225 square feet. This heater excels in several areas including its powerful radiant heat output and the advanced safety features it incorporates, such as a reliable tip-over safety switch and a low-oxygen shut-off system, which enhance safety in indoor settings.

The Piezo igniter ensures quick and hassle-free ignition without the need for external matches or lighters, adding to its user-friendly design. Its portability is another strong point, with a lightweight build and fold-down handle that make it easy to move around. Moreover, this heater offers flexible fuel options, connecting easily to a 1 lb. cylinder or adapting to a 20 lb. tank with an optional hose and filter.

Users will appreciate its fuel efficiency, providing up to 6 hours of heat on the low setting and 3 hours on high, ensuring prolonged warmth without frequent refills. However, one potential drawback is the absence of a built-in thermostat control, which means users need to manually adjust the heat settings. Additionally, while it is marketed as indoor-safe, adequate ventilation is still essential to prevent the build-up of carbon monoxide. This heater is best suited for small indoor spaces like bedrooms, home offices, and garages, as well as outdoor areas such as patios and job sites. Its combination of safety, portability, and efficiency makes it a reliable choice for those in need of a flexible heating solution.

The Mr. Heater 30,000 BTU Vent Free Radiant Propane Heater stands out in the indoor heating category, especially for spaces like cold rooms, sunrooms, and cabins. With a robust output of 30,000 BTUs, it efficiently warms areas up to approximately 1,000 sq. ft., making it suitable for larger spaces. Its advanced infrared technology is a highlight, delivering warmth directly to objects and people instead of just heating the air, which can feel more comfortable in chilly conditions.

Safety is a significant consideration, and this heater features an automatic low-oxygen shut-off system. This is crucial for indoor use, as it ensures the heater will turn off if oxygen levels fall too low, providing peace of mind while using it. Additionally, the convenience of a built-in thermostat allows for easy temperature adjustments, and the battery-powered ignition simplifies starting the unit.

There are a few aspects to consider. While it's designed for larger areas, the actual effective heating coverage is about 750 sq. ft., which may limit its effectiveness in very spacious settings. Portability is another point; weighing in at 30.1 pounds, it’s not overly heavy, yet wall mounting is required, which could be a drawback for those looking for flexibility in placement. Being a vent-free model means that it does not require a flue or chimney, which can be advantageous for installation but may also raise concerns regarding indoor air quality over prolonged use. It’s essential to ensure that the room is well-ventilated when using this heater.