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

The Mr Heater 4000 to 18000 BTU Portable LP Gas Heater is a versatile option for heating indoor spaces, with a focus on portability and adjustable heating levels. It can produce 4,000, 9,000, or 18,000 BTUs per hour, making it suitable for areas up to 450 square feet, which is great for small rooms or even outdoor settings like porches and picnics. This flexibility allows users to customize warmth based on their needs.

Safety features are a strong point with this heater. It includes an automatic shutoff mechanism that activates if the unit tips over, which is crucial for indoor use. Additionally, it has a low-oxygen safety shutoff feature, ensuring that adequate ventilation is maintained, which is important for preventing dangerous situations with propane heaters.

Portability is another highlight, as it weighs only 15 pounds and is easy to move around. This makes it a good choice for users who need a heater that can be relocated easily between different areas. However, it is essential to note that while it can connect to larger propane tanks for extended use, these accessories are not included, which may lead to extra costs. Users need to ensure proper ventilation when using this heater indoors, as it relies on combustion, and failure to do so may lead to safety concerns. Additionally, the lack of built-in features like a thermostat can be a downside for those looking for more precise temperature control.

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 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.