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

The Rinnai EX38DTWN Direct Vent Wall Furnace is an indoor natural gas heater designed to deliver efficient and consistent heating with a capacity of 38,400 BTU. This makes it suitable for medium to large rooms, up to 1600 square feet. Its advanced modulating technology ensures even heat distribution, eliminating cold spots and providing a cozy environment.

The heater features a programmable thermostat, allowing users to customize temperatures according to their needs and offering integration with Wi-Fi-enabled systems for enhanced convenience. Safety is a key strength, with a cool-to-the-touch cabinet and self-diagnostic electronics making it safe for families with children. Additionally, it is energy-efficient, minimizing fuel consumption without compromising on heat output, which is beneficial for reducing energy bills.

The unit is compact and wall-mounted, saving space, and fitting seamlessly into modern homes and urban apartments. However, its weight of 108 pounds may be a drawback for some users when it comes to installation. Another consideration is the need for proper ventilation as it is a direct vent heater. The Rinnai EX38DTWN is a reliable and efficient choice for those seeking a safe and customizable heating solution, particularly suited for home or office use.

The Rinnai EX22DTWN Direct Vent Wall Furnace is a robust indoor natural gas heater, boasting a heating capacity of 21,500 BTU, which makes it well-suited for maintaining warmth in various room sizes. One of its standout features is the advanced modulating technology that enables consistent and efficient heating, ensuring that cold spots are effectively eliminated. This can be particularly beneficial for those seeking a comfortable and evenly heated living space. Additionally, the heater's programmable thermostat provides customizable comfort, allowing users to set specific temperatures and even integrate with Wi-Fi systems for added convenience.

This level of control can be a big plus for users who want to manage their home heating efficiently and effortlessly. Safety is a top priority with this unit, evidenced by the cool-to-the-touch cabinet and self-diagnostic electronics, which make it a safe choice for households with children. The compact, wall-mounted design is another attractive feature, especially for urban residents or those with limited space, as it does not take up floor space and blends well with modern interiors.

However, the product requires proper ventilation due to its direct vent design, which might necessitate professional installation if you are not handy. Despite the energy efficiency claims, users should still monitor their energy consumption to ensure it meets their personal efficiency standards. While the unit is fairly quiet, it might not be completely noiseless, depending on individual sensitivity to sound. The Rinnai EX22DTWN is a reliable, efficient, and safe option for indoor heating, particularly suitable for families and those living in compact spaces.

The Mr. Heater 4000 to 18000 BTU portable propane gas heater is a versatile option for indoor and outdoor use. It offers a range of heating capacities (4,000, 9,000, or 18,000 BTU) which makes it suitable for various room sizes up to 450 square feet. One of its key strengths is the dual tank connection, allowing you to use up to 40 lbs propane tanks with an additional hose and filter, giving flexibility depending on your heating needs. It’s user-friendly with a single control start knob and piezo sparking mechanism, making it easy to operate.

The safety features are commendable, including an automatic shutoff if the device tips over and a low-oxygen safety shutoff, which is crucial for indoor use. The heater is quite portable, weighing only 15 pounds and having compact dimensions (16.7”D x 11.2”W x 12”H), making it easy to move around. This product is ideal for individuals needing a flexible heating solution for various indoor spaces like bedrooms, living rooms, or offices, and also for outdoor activities like camping or in a garage.

The heater’s reliable safety features and portability make it a strong choice, though potential buyers should be prepared to purchase the necessary accessories separately.