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 RE199iN Non-Condensing Natural Gas Tankless Water Heater is a compact and efficient option for those needing a reliable indoor water heater. It has an impressive flow rate of up to 7.6 gallons per minute (GPM), which means it can handle multiple fixtures simultaneously, providing continuous hot water for your household needs. Its smart design heats water only when necessary, contributing to better energy efficiency, although as a non-condensing unit, it may not be as efficient as condensing models. With a powerful 199,000 BTU rating, it can handle significant demands effectively.