10 Best Tankless Water Heaters 2025 in the United States

The Rinnai RXP199iN Condensing Smart Sense Tankless Water Heater offers impressive versatility, operating with either natural gas or propane and being suitable for both indoor and outdoor installations. With a flow rate of up to 11.1 GPM, it can handle multiple fixtures at once, making it ideal for larger households. Its compact size and modern design, which includes features like Quick Flush and Smart-Circ Intelligent Recirculation, enhance its efficiency and user-friendliness.

The Rinnai RX199iN is a robust tankless water heater that is designed for both indoor and outdoor installation, offering flexibility in its setup. With a flow rate of up to 11.1 gallons per minute, it effectively supports multiple fixtures simultaneously, making it a great choice for larger households or those with high hot water demands. Its high energy efficiency rating of UEF .98 means you can expect notable savings on energy bills over time, which is especially beneficial for eco-conscious users.

The Rinnai RX160iN tankless water heater is a solid choice if you want a compact and efficient unit that can serve multiple fixtures at once. It offers a high flow rate of up to 9 gallons per minute, which means it can comfortably supply hot water to about six taps simultaneously — great for larger households or homes with higher hot water demands. Its energy efficiency is excellent, with a UEF rating of 0.97, helping you save on energy bills compared to traditional water heaters.