10 Best Rinnai Tankless 2026 in the United States

The Rinnai RX180iN is a versatile tankless water heater that works with either natural gas or propane, giving you flexibility depending on your fuel source. It delivers a strong flow rate of up to 10 gallons per minute, which means it can handle hot water for multiple fixtures at once, like showers and taps, making it suitable for medium to larger homes. Its energy efficiency is excellent, with a UEF of 0.98, helping to reduce energy bills compared to traditional water heaters.

The unit has a compact size roughly like a small suitcase and can be installed indoors or outdoors with the proper venting, offering installation flexibility. Professional installation is recommended due to the complexity of setup and venting requirements. It features a user-friendly interface and a smart gas control system that helps maintain consistent water temperature up to 140°F, which is plenty hot for everyday needs. The heater is also designed for easy maintenance with features like a Quick Flush system. While it doesn’t include WiFi control by default, it is compatible with an optional module for remote monitoring.

Weighing 54 pounds, it mounts on a wall, saving floor space. Customers rate it highly, reflecting reliability and performance. If you want an energy-efficient, high-capacity tankless water heater with flexible fuel and installation options, the Rinnai RX180iN is an excellent choice. Be prepared for professional installation and to check local codes for outdoor setups.

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.

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.