10 Best Tankless Hot Water Heaters 2026 in the United States

The Rinnai RXP199iN is a versatile tankless water heater designed for both indoor and outdoor use, thanks to its Versa Vent system. It runs on either natural gas or propane, which adds flexibility depending on your fuel preference. With a strong flow rate of up to 11.1 gallons per minute, it can supply hot water to around seven fixtures simultaneously, making it suitable for medium to large households. Its energy efficiency is excellent, boasting a UEF (Uniform Energy Factor) of 0.98, which means it uses fuel very efficiently and can help reduce energy bills.

The Rinnai RX199iN is a powerful tankless water heater that stands out for its impressive flow rate of up to 11.1 gallons per minute, making it suitable for homes with multiple fixtures needing hot water simultaneously. It's designed to operate on either natural gas or propane, giving you flexibility depending on your fuel source. The energy efficiency is top-notch, boasting a UEF rating of .98, which means it uses energy very effectively, potentially saving you on utility bills.

The Rinnai RX180iN tankless water heater is a versatile choice for homeowners needing reliable, on-demand hot water. It offers a solid flow rate of up to 10 gallons per minute, enough to supply hot water to about six fixtures simultaneously, which suits larger households or homes with higher hot water demands. This model runs on either natural gas or propane, providing flexibility depending on your fuel preference or availability. Its energy efficiency is very high, with a UEF rating of 0.98, meaning it wastes very little energy, which can help reduce utility bills over time.