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 MH9BX is a portable propane radiant heater delivering between 4,000 and 9,000 BTUs, suitable for heating small spaces up to about 225 square feet. It’s lightweight and compact, making it easy to carry with its fold-down handle, and runs up to about 5.6 hours on low heat with a propane tank (sold separately). Safety is a strong point here—the heater automatically shuts off if tipped over, if the pilot light goes out, or if it senses low oxygen levels, which adds peace of mind for indoor or outdoor use.

This model is primarily designed and approved for outdoor use, so careful attention to ventilation is essential if used indoors to avoid dangerous buildup of gases. It lacks a built-in thermostat for precise temperature control, and ignition is manual via pilot light, which means no push-button start. Additionally, it may stop working properly at high altitudes over 7,000 feet. The heater does not allow unauthorized accessories, which could void the warranty and affect safety.

The heater works well as a portable, efficient heater for small outdoor areas or well-ventilated indoor spaces but requires caution indoors due to ventilation needs and limited temperature control. For those seeking a simple, reliable propane heater mainly for outdoor or occasional indoor use where ventilation is good, this model could be a solid choice.