10 Best Rinnai Tankless 2026 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.

The Rinnai RE199eP is an outdoor propane tankless water heater designed to deliver up to 9.8 gallons per minute (GPM), which means it can supply hot water to several fixtures at once without running out. This flow rate is high enough for medium to large households that need multiple taps or showers operating simultaneously. It operates at 199,000 BTU, providing a strong temperature rise suitable for colder climates or homes with higher hot water demand. Being non-condensing, it’s slightly less energy-efficient than condensing models, but it still meets strict emission standards, balancing performance and environmental considerations.

The Rinnai RE180iN is a natural gas tankless water heater designed for indoor use, offering a solid flow rate of up to 8.5 gallons per minute (GPM). This means it can handle multiple fixtures at once, which is great for families or homes with higher hot water demands. It operates at 180,000 BTU, providing a strong temperature rise suitable even in colder climates, but actual performance may vary depending on your local water temperature. Energy efficiency is decent at around 82%, helping keep your gas usage reasonable compared to traditional tank heaters.