10 Best Rinnai Tankless 2026 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 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.

The Rinnai REP199iN Smart-Circ Non-Condensing Natural Gas Tankless Water Heater is a highly efficient and compact option for those looking to never run out of hot water. With a flow rate of up to 7.9 gallons per minute (GPM), it can handle up to six fixtures at once, making it suitable for larger households. The built-in recirculation pump with Smart-Circ technology optimizes energy use by learning your water usage patterns, ensuring hot water is available when you need it while conserving energy. This can result in notable savings on your energy bill over time.

As a natural gas unit, it provides a cleaner burn compared to other fuel types, though installation may require a professional to ensure proper setup and safety compliance. It's designed for indoor installation and its compact size allows it to fit into tight spaces, similar to the size of a small suitcase. The heat output is significant at 199,000 BTU, ensuring a high temperature rise and consistent hot water supply.

The warranty coverage is comprehensive, with a 15-year guarantee for the heat exchanger, 5 years for labor, and 1 year for parts, providing peace of mind regarding durability and support. However, the unit does not include WiFi control out of the box, which could be a drawback for those looking for remote operation capabilities. Additionally, professional installation is recommended, which could add to the initial cost. Despite these drawbacks, its high efficiency and smart technology make it a compelling choice for energy-conscious users looking for reliable hot water supply.