10 Best Tankless Gas Water Heaters 2025 in the United States

The Rinnai RXP199iN tankless water heater offers a notable blend of versatility and efficiency. Its capacity to deliver up to 11.1 GPM makes it suitable for households with high hot water demands, potentially serving up to seven fixtures simultaneously. This high flow rate, coupled with a substantial 199,000 BTU rating, ensures a consistent supply of hot water even during peak usage times. The energy efficiency factor (UEF) of .98 indicates the unit is highly efficient, contributing to lower energy bills over time and making it an eco-friendly choice.

The Rinnai RXP160iN is a versatile tankless gas water heater that can run on either natural gas or propane, suitable for both indoor and outdoor installation with the proper venting. It delivers up to 9 gallons per minute, comfortably supplying hot water to multiple fixtures simultaneously—a good flow rate for medium to large households. Its energy efficiency is excellent, with a UEF rating of 0.97, which helps save on energy costs compared to traditional tank water heaters. The 160,000 BTU output ensures strong heating power, capable of maintaining a high temperature rise even if incoming water is quite cold.

The Rheem RTGH-95DVLN-3 is a strong contender in the tankless gas water heater category. With a flow rate of up to 9.5 gallons per minute (GPM) and a BTU rating of 199,900, it’s capable of supplying hot water for multiple outlets simultaneously, making it ideal for larger households. Its energy efficiency rating of 0.93 means you can expect decent savings on energy bills, which is a big plus for budget-conscious consumers. Additionally, the unit features an integrated digital display that allows for easy temperature adjustments, ranging from 100 to 140°F, catering to various user preferences.