10 Best Rinnai Tankless 2025 in the United States

The Rinnai RXP199iN is a versatile tankless water heater suitable for both indoor and outdoor installations, thanks to its adaptable Versa Vent system. With the capacity to deliver up to 11.1 gallons per minute, it can efficiently supply hot water to multiple fixtures simultaneously, making it ideal for larger households or small businesses. Powered by natural gas or propane, this model offers flexibility in fuel options, and its high energy efficiency of 98% helps minimize utility costs.

A standout feature is the Smart-Circ Intelligent Recirculation system, which optimizes water heating based on your usage habits, enhancing both convenience and energy conservation. The Smart Sense gas control system further ensures safe and efficient operations. However, utilizing the full potential of this heater requires additional purchases, like the Control-R module for WiFi connectivity, which is not included. This device allows for remote control and monitoring, adding a layer of convenience for tech-savvy users.

Installation is recommended to be handled by professionals to ensure safety and optimal functionality, and Rinnai provides resources to locate qualified technicians. While the product's compact size makes it easy to fit in various spaces, its installation complexity might be a consideration for those seeking a straightforward setup. With a maximum temperature of 140 degrees Fahrenheit and robust performance at 199,000 BTUs, the Rinnai RXP199iN is designed for high-demand settings. Though the initial investment might be higher compared to some competitors—given the need for professional installation and additional accessories—the long-term savings on energy bills and the continuous hot water supply could justify the cost for many users.

The Rinnai RX199iN is a versatile tankless water heater that can be powered by natural gas or propane and installed indoors or outdoors. With a maximum flow rate of up to 11.1 gallons per minute, it can support multiple fixtures simultaneously, which is ideal for families or homes with high hot water demands. Its compact design, roughly the size of a small suitcase, makes it easier to install in various spaces without taking up too much room.

One of its standout features is its energy efficiency, boasting a UEF rating of .98, which means it can help save on utility bills while providing hot water on demand. The Smart Sense gas control system enhances user convenience, but keep in mind that it requires professional installation, which might be an additional cost for homeowners.

The quick flush feature simplifies maintenance, which is a plus for users who may not have much experience with water heaters. However, the reliance on professional installation could deter DIY enthusiasts or those looking to save on installation costs. The WiFi control is available but requires an additional module, which may not appeal to everyone. The Rinnai RX199iN is a solid choice for households seeking a reliable and efficient tankless water heater.

The Rinnai RE180iN is a natural gas tankless water heater designed for indoor use, offering a solid flow rate of up to 8.5 gallons per minute (GPM). This means it can handle multiple fixtures at once, which is great for families or homes with higher hot water demands. It operates at 180,000 BTU, providing a strong temperature rise suitable even in colder climates, but actual performance may vary depending on your local water temperature. Energy efficiency is decent at around 82%, helping keep your gas usage reasonable compared to traditional tank heaters.

Its compact size, about the size of a small suitcase, allows flexible installation on a wall, saving space. However, professional installation is recommended to ensure it works safely and efficiently, which might add to the upfront cost. The LED display is a handy feature, giving error codes and maintenance reminders to help keep things running smoothly. Warranty coverage is solid, with 15 years on the heat exchanger and shorter periods on parts and labor, providing peace of mind about durability.

This model is non-condensing, so it’s slightly less efficient compared to condensing units that can save more energy by utilizing exhaust heat. While there is an option for WiFi control via an additional module, it’s not included, so extra cost and setup are needed for smart home features. This water heater suits users looking for reliable, consistent hot water without a large tank, particularly if they prefer natural gas and have space limitations. Those wanting maximum energy savings or smart features might want to consider other models or budget for the extras.