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 RE199eP is an outdoor propane tankless water heater designed to deliver up to 9.8 gallons per minute (GPM), which means it can supply hot water to several fixtures at once without running out. This flow rate is high enough for medium to large households that need multiple taps or showers operating simultaneously. It operates at 199,000 BTU, providing a strong temperature rise suitable for colder climates or homes with higher hot water demand. Being non-condensing, it’s slightly less energy-efficient than condensing models, but it still meets strict emission standards, balancing performance and environmental considerations.

The heater's compact size (about the size of a small suitcase) makes it easier to install outdoors on a wall, freeing up indoor space and reducing the risk of indoor gas leaks. Installation requires a professional to ensure safety and optimal operation. The unit features a clear LED display for monitoring and troubleshooting, which is handy for maintenance. Rinnai backs this product with a solid warranty: 15 years on the heat exchanger, 5 years on labor, and 1 year on parts, showing confidence in its durability.

A noted drawback is that it doesn’t include a recirculation pump, which some users might want for quicker hot water delivery; however, a related model offers this feature. This water heater is an excellent choice for homeowners seeking reliable, propane-fueled hot water with good flow rate and durability, especially in areas suitable for outdoor installation.

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.