10 Best Rinnai Tankless 2025 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 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 RU160iN is a natural gas tankless water heater designed for indoor installation, offering a strong flow rate of up to 9 gallons per minute (GPM). This means it can supply hot water to several appliances at the same time, making it a good choice for medium to larger households. Its tankless design helps save space and provides endless hot water, as it heats water only when needed. The built-in Smart-Circ recirculation pump is a useful feature that can reduce wait time for hot water, although it requires pairing with an external pump.

Energy efficiency is a highlight here, with an ENERGY STAR qualification and a high Uniform Energy Factor (0.97), so it helps lower your utility bills compared to traditional water heaters. Since it uses natural gas, it might be more cost-effective in areas where gas is cheaper than electricity. The size is fairly compact (about 22 by 34 inches), and wall mounting keeps it out of the way, but professional installation is strongly recommended to ensure safety and proper setup.

On the downside, while it has a solid 15-year warranty on the heat exchanger, labor and parts are covered for shorter periods (5 and 1 years), which might be something to consider. It weighs around 72.5 pounds, so installation might require some effort. Also, the WiFi monitoring feature is optional and sold separately, which could be an added cost if you want remote control. The Rinnai RU160iN suits homeowners looking for a reliable, energy-efficient natural gas tankless water heater that can handle multiple hot water demands simultaneously, balancing space-saving design with powerful performance, but requiring professional installation and some additional investment for full smart features.