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 V53DeP Tankless Hot Water Heater is designed for outdoor installation and runs on propane, making it a suitable option for homes that prefer gas over electric water heaters. With a maximum flow rate of 5.3 gallons per minute (GPM), it can efficiently provide hot water to multiple appliances simultaneously, which is great for larger households or busy mornings. The unit's high energy efficiency ensures that it heats water only when needed, which can result in significant savings on your energy bills. Enhanced scale detection is another notable feature, reducing the risk of long-term damage to the heater.

However, one of the drawbacks is the necessity for professional installation, which adds to the initial cost. The compact design (13 inches wide by 30 inches high) allows for space-saving installation, making it a good fit for homes with limited space. The product comes with a robust warranty—10 years for the heat exchanger, 5 years for labor, and 1 year for parts—indicating the manufacturer's confidence in its durability.

The heater is also Wi-Fi capable, allowing for convenient monitoring and adjustments. While its outdoor installation requirement and the need for professional setup might limit its flexibility for some users, its efficient performance and durability make it a strong contender in the tankless water heater market.