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 RXP160iN is a versatile tankless water heater that works with either natural gas or propane, making it a good fit for many homes. It delivers a solid flow rate of up to 9 gallons per minute, which means it can supply hot water to around six fixtures at once—great for medium to larger households. Its energy efficiency is high, with a UEF rating of 0.97, meaning it uses fuel very effectively to keep your energy bills lower and reduce waste.

This model stands out because it can be installed indoors or outdoors, thanks to its smart venting options, but outdoor installation requires an additional vent cap. The unit is compact—about the size of a small suitcase—making it suitable even for homes with limited space. A notable feature is the Smart-Circ recirculation pump that learns your hot water usage patterns and helps reduce water waste by circulating hot water efficiently. The heater also has an easy-to-use interface and offers WiFi control capabilities with an optional module, adding convenience for tech-friendly users.

Installation should be done by a professional to ensure safety and optimal performance, and Rinnai supports this with an app and a network of qualified installers. The unit weighs 57 pounds and runs on standard household electricity for its control system, but it does not require batteries. While the upfront cost and complexity of installation might be higher compared to traditional water heaters, and outdoor installation needs extra parts, Rinnai is a reputable brand known for good customer service. The Rinnai RXP160iN is a reliable, energy-efficient tankless water heater ideal for users wanting consistent hot water for multiple fixtures with smart features and flexible installation options.

The Rinnai RE199iN Non-Condensing Natural Gas Tankless Water Heater is a compact solution offering a strong flow rate of up to 7.6 gallons per minute (GPM), which is sufficient to supply hot water to multiple fixtures simultaneously. Its smart design, featuring an LED display for service reminders and error codes, further enhances its user-friendliness and serviceability. The heater is powered by natural gas and boasts a high energy efficiency by heating water only when necessary, helping to conserve energy effectively.

The unit's compact size, akin to a small suitcase, makes it suitable for indoor installations where space might be limited. It is designed for wall mounting, which further aids in saving space. For durability, Rinnai offers a comprehensive warranty: 15 years for the heat exchanger, 5 years for parts, and 1 year for labor, providing peace of mind to users.

Professional installation is recommended, which could add to the initial setup costs. Additionally, some users might need the optional Controlr module for WiFi control, which is not included. Considering its capacity and features, this unit is well-suited for households with significant hot water demands looking for a dependable and efficient water heating solution.