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 CU199eP Commercial Propane Condensing Tankless Water Heater is designed for outdoor installation and offers a high flow rate of 11 gallons per minute (GPM), which is sufficient to meet the demands of a business that requires consistent hot water. Its energy efficiency is notable, as it only heats water when necessary, thanks to its smart Circ-Logic technology. This feature also allows for recirculation patterns based on typical usage, reducing energy waste.

Additionally, the unit supports Wi-Fi monitoring, enabling remote control for on-demand hot water, adding to its convenience and smart operation. The heater operates on propane, making it suitable for locations without electric water heating capabilities. It is compact (22.05 inches wide and 14.75 inches high) and wall-mounted, saving valuable space. However, professional installation is recommended, which might add to the initial cost.

The warranty is robust with 8 years on the heat exchanger, 5 years on parts, and 1 year on labor, offering good support and peace of mind. The Rinnai CU199eP is a strong contender for businesses looking for a reliable, energy-efficient, and space-saving water heating solution.