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 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.