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 RE140iN Non-Condensing Natural Gas Tankless Water Heater is a compact and efficient option for those seeking endless hot water supply without the bulk of a traditional tank heater. With a maximum flow rate of 5.3 GPM, it can handle multiple fixtures simultaneously, making it a great choice for medium-sized households. Its smart design not only conserves energy by heating water only when necessary, but it also features an LED display for service reminders and error codes, helping users stay informed about maintenance needs.

One of the standout benefits of this heater is its size; comparable to a small suitcase, it can be installed in various locations, freeing up valuable space in your home. The unit also comes with a solid warranty, offering a 15-year guarantee on the heat exchanger and a 5-year warranty on parts, which adds peace of mind for buyers.

However, there are some considerations to keep in mind. Professional installation is strongly recommended, which may add to the overall cost of getting the unit up and running. Additionally, while it operates efficiently, its performance can vary depending on your local ground water temperatures, so it's essential to check compatibility with your region before purchasing. In terms of energy efficiency, this model performs well, but users looking for maximum savings should ensure that their homes are optimized for tankless systems.

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.