10 Best Propane Gas Heaters 2025 in the United States

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 Mr Heater 4000 to 18000 BTU Portable LP Gas Heater is designed for versatile indoor and outdoor use, making it a great choice for camping, patios, and workshops. With a BTU range of 4,000 to 18,000, it can effectively heat areas up to 450 square feet, ensuring comfort in various settings. One of its standout strengths is its dual tank connection option, allowing it to run with larger propane tanks, which means longer usage without frequent refills. The simple ignition system is user-friendly, thanks to a single control knob and a reliable piezo sparking mechanism. Additionally, safety features like automatic shutoff in case of tipping and low-oxygen shutoff provide peace of mind during operation.

However, there are a few drawbacks to consider. While the heater is portable at 15 pounds, it may still be cumbersome for some users needing to frequently transport it. Also, the lack of included components like hoses, filters, and batteries might lead to additional costs and required purchases. Furthermore, while it's rated for both indoor and outdoor use, users should be cautious and ensure proper ventilation when using it indoors to avoid any safety issues.

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.