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 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 RX160iN is a versatile tankless water heater that works with natural gas or propane and can be installed indoors or outdoors, making it a great fit for various home setups. It delivers up to 9 gallons per minute, which is enough to supply hot water to multiple fixtures at once—ideal for medium to large households. The heater is compact, about the size of a small suitcase, so it won’t take up much space.

Its high energy efficiency rating (UEF 0.97) means it uses fuel smartly, helping to lower utility bills compared to traditional water heaters. Features like the Smart Sense gas control and Quick Flush make it easier to maintain and operate efficiently. While it offers optional WiFi control for modern convenience, this requires an additional module. Installation is best handled by a professional due to the technical requirements, especially if installing outdoors or connecting gas lines. The unit comes with good support options and a warranty, which adds peace of mind.

Professional installation and the initial cost might be higher than standard water heaters, and setting it up without expert help isn't recommended. This Rinnai model is well suited for homeowners seeking reliable, energy-efficient hot water with modern controls and flexibility in fuel and placement, provided they are ready to invest in proper installation.