10 Best Tankless Gas Water Heaters 2026 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 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.

The Rheem Natural Gas Condensing Tankless Water Heater is designed for indoor use and offers a strong flow rate of up to 9 gallons per minute, which is suitable for medium to large households needing consistent hot water from multiple taps simultaneously. Its energy factor of 0.93 indicates excellent efficiency, meaning it uses gas economically and can help lower utility bills compared to less efficient models. With a high BTU rating of 180,000, it can handle a good temperature rise, providing hot water up to 140°F, adjustable to your comfort preferences. The unit is relatively compact, measuring about 17.7 inches wide and 23.7 inches high, making it easier to install in tighter indoor spaces.