10 Best Gas Heaters For Indoor Use 2026 in the United States

The Rinnai EX38DTP is a propane-powered, wall-mounted gas heater designed for indoor use, offering a strong heating capacity of 36,500 BTU, which can comfortably warm up to about 1600 square feet. Its direct vent system helps safely expel combustion gases outside, making it suitable for enclosed spaces with proper ventilation. The heater includes several safety features like a cool-to-the-touch cabinet and self-diagnostic electronics, which add peace of mind especially for homes with children.

It also has a programmable thermostat that supports smart home integration, allowing you to control your home’s temperature easily and save energy by only heating when needed. The compact design helps it fit neatly on a wall without taking up floor space, a good fit for smaller or urban homes. However, at 108 pounds and a wall-mounted setup, it’s not portable and requires professional installation and a propane gas connection.

For those seeking a reliable, energy-efficient indoor propane heater with smart features and good safety measures, this model represents a solid choice. However, if you prefer a lightweight or portable heater, or one that runs on electricity or natural gas, this unit may not meet your requirements.

The Rinnai EX22DTP is a propane-powered direct vent wall heater designed to warm indoor spaces efficiently, with a heating capacity of 20,700 BTU suitable for rooms up to around 1,600 square feet. Its direct vent system safely expels combustion gases outside, making it safer for indoor use compared to ventless heaters. Safety features include a cool-to-the-touch exterior and self-diagnostic electronics, which is reassuring for homes with children.

The heater offers precise temperature control through a programmable thermostat that can connect to Wi-Fi systems, allowing for convenient, customized heating schedules. Its wall-mounted design is compact and space-saving, ideal for urban homes or rooms where floor space is limited. However, it weighs 67 pounds and requires professional installation due to venting needs, which can limit portability and add to setup costs. It runs on propane only, so it is important to ensure you have a propane supply and proper ventilation to maintain safety.

Energy efficiency and quiet operation are additional benefits, though users looking for a more portable or multi-fuel option might find this unit less flexible. The Rinnai EX22DTP represents a solid choice for those seeking a reliable, safe, and energy-efficient indoor propane heater with smart controls, especially in spaces where wall mounting is preferred.

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.