10 Best Propane Gas Heaters 2025 in the United States

The Rinnai RE140iP is a propane tankless water heater designed for indoor use that offers strong heating power with its 140,000 BTU rating, capable of delivering up to 5.3 gallons of hot water per minute. This means it can handle multiple water fixtures at once, making it a good fit for households needing a steady, on-demand hot water supply without running out. Its compact size is a plus, roughly the size of a small suitcase, which helps with installation in tighter spaces. The unit features an LED display for easy monitoring, including service reminders and error codes that can aid in maintenance and troubleshooting. While it is designed for indoor installation, it requires professional installation to ensure safety and proper operation.

The heater is not portable due to its size and installation needs, and it uses propane gas directly rather than electricity, which can be efficient but requires a reliable propane supply. This model suits homeowners who want a reliable, high-output hot water system and are comfortable arranging professional installation. It is less suitable for those needing a portable or outdoor heater or those unfamiliar with propane systems.

The Ranein Propane Gas Tankless Water Heater is a powerful unit with a 100,000 BTU rating and can deliver up to 4.3 gallons of hot water per minute. This makes it suitable for supplying hot water to multiple points like a bathroom, kitchen, and bar without running out. Its tankless design means you get instant hot water without waiting, which is convenient for busy households. It also includes smart features like automatic temperature adjustment for different seasons and preset modes for kitchen and bathtub uses, enhancing comfort and ease of use.

Safety-wise, the product includes a vent pipe for proper exhaust, which is important for indoor use. Installation should be done by professionals to meet local codes, and it’s not recommended for high-altitude areas over 2,000 feet. Portability is average since it weighs 28 pounds and is designed more as a semi-permanent indoor fixture rather than a portable heater.

The heater uses propane efficiently with a copper water tank that helps reduce heat loss and energy consumption. It runs on standard 120V power for controls but does not need electric batteries. This model is best suited for homeowners looking for a reliable, on-demand hot water solution that avoids the energy waste of tank heaters and meets the needs of multiple water outlets. For those needing a heater for larger spaces, outdoor use, or a fully portable option, this might not be the best fit.

The Rinnai REP160iP is a high-powered indoor propane tankless water heater, offering 160,000 BTUs and a maximum flow rate of 6.1 gallons per minute, which means it can supply hot water to multiple fixtures simultaneously. It features Smart-Circ technology, which includes a built-in recirculation pump that learns your water usage patterns to minimize wasted energy, adding convenience and efficiency. This model is compact and wall-mounted, making it suitable for homes where space-saving is important, but it weighs about 58 pounds, so it’s not very portable and requires professional installation to ensure safety and proper operation.

The heater is designed for indoor use only and does not use electricity, relying solely on propane, which can be more economical and suitable for off-grid setups. Safety features typical for propane heaters are included, and it is important to follow local codes and installation guidelines. The unit comes with a solid warranty covering parts and labor for up to 15 years on the heat exchanger, reflecting confidence in its durability.

This product offers smart features and high efficiency, making it well-suited for homeowners looking for reliable, continuous hot water without the bulk of a tank, rather than those needing a portable or outdoor heater. Its professional installation requirement and indoor-only design limit its flexibility but help ensure safe and efficient use in the appropriate setting.