10 Best Rinnai Tankless 2025 in the United States

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.

The Rinnai REP199iN Smart-Circ Non-Condensing Natural Gas Tankless Water Heater is a highly efficient and compact option for those looking to never run out of hot water. With a flow rate of up to 7.9 gallons per minute (GPM), it can handle up to six fixtures at once, making it suitable for larger households. The built-in recirculation pump with Smart-Circ technology optimizes energy use by learning your water usage patterns, ensuring hot water is available when you need it while conserving energy. This can result in notable savings on your energy bill over time.

As a natural gas unit, it provides a cleaner burn compared to other fuel types, though installation may require a professional to ensure proper setup and safety compliance. It's designed for indoor installation and its compact size allows it to fit into tight spaces, similar to the size of a small suitcase. The heat output is significant at 199,000 BTU, ensuring a high temperature rise and consistent hot water supply.

The warranty coverage is comprehensive, with a 15-year guarantee for the heat exchanger, 5 years for labor, and 1 year for parts, providing peace of mind regarding durability and support. However, the unit does not include WiFi control out of the box, which could be a drawback for those looking for remote operation capabilities. Additionally, professional installation is recommended, which could add to the initial cost. Despite these drawbacks, its high efficiency and smart technology make it a compelling choice for energy-conscious users looking for reliable hot water supply.

The Rinnai CX199iN High Efficiency Plus Natural Gas Interior Tankless Water Heater offers a high flow rate of up to 11.1 gallons per minute (GPM), making it suitable for larger households with high hot water demands. Its energy efficiency rating of 96% is impressive, ensuring that you get the most out of your fuel consumption, whether using natural gas or propane.

A key benefit is its advanced Smart Sense Gas Control System, which ensures optimal gas usage, alongside the Smart Connect feature that allows for easy setup, service, and troubleshooting via the Rinnai Central App. The Quick Flush feature simplifies maintenance by making the flushing process straightforward, which helps prolong the unit's lifespan.

Despite its advanced features, the unit is relatively compact with dimensions of 18.5 inches wide by 30.11 inches high, and it can be wall-mounted to save space. Weighing just under 60 pounds, it is manageable for most installations. Its high efficiency and advanced features come at a higher initial cost compared to some lower-efficiency models. Users looking for a highly efficient, feature-rich tankless water heater capable of handling significant hot water needs will find the Rinnai CX199iN an excellent choice, provided they are willing to invest in its advanced capabilities.