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.

Additionally, the unit's compact size, comparable to a small suitcase, facilitates flexible installation options, whether indoors or outdoors, thanks to the Versa Vent system and the Smart Sense gas control system accommodating both natural gas and propane. The Smart-Circ Intelligent Recirculation feature is a standout, learning your water usage patterns to optimize efficiency and convenience by scheduling pump and recirculation activities.

While the design is user-friendly with features like an easy-to-use interface and Quick Flush function, professional installation is strongly recommended. This might be a drawback for those looking for a DIY solution and could add to the initial setup cost. Another potential downside is the need for an additional Control-R module for WiFi connectivity, which isn't included with the unit. This water heater is ideal for larger homes or any setting requiring a substantial and steady hot water supply, especially for users who prioritize energy efficiency and modern conveniences.

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 compact design—measuring 17.7" wide and 23.7" high—makes it suitable for installations in smaller spaces, while the electric ignition simplifies startup. The manufacturer also offers a solid warranty: 1 year for labor, 15 years for the heat exchanger, and 5 years on parts, providing peace of mind for your investment.

However, there are some considerations to keep in mind. The venting requirements may necessitate additional installation work, particularly if your home isn't already set up for it, which could add extra costs. Furthermore, while its high flow rate is impressive, actual performance can vary based on incoming water temperature and other factors; thus, customers in colder climates might experience lower output.

The Rinnai RE199eN Non-Condensing Natural Gas Tankless Water Heater is designed to deliver up to 7.6 GPM, making it suitable for homes with multiple fixtures needing hot water simultaneously. It boasts a high BTU rating of 199,000, ensuring a strong heating capacity that can handle significant temperature rise demands. The flow rate and BTU rating make this unit particularly effective for larger households or those with high hot water usage needs.

Its compact design, about the size of a small suitcase, allows for outdoor installation, freeing up indoor space and making it less intrusive. The LED display is a convenient feature that provides service reminders and error codes, aiding in maintenance and troubleshooting. However, it is important to note that this model is non-condensing, which typically means it might be less efficient compared to condensing models. This may result in slightly higher energy consumption and operational costs.

Additionally, professional installation is recommended, which could add to the initial investment. The heater comes with a solid warranty period—15 years for the heat exchanger, 5 years for labor, and 1 year for parts—providing some peace of mind regarding its durability. The option for WiFi control is available, but the Controlr module is sold separately. This water heater is a strong contender for those needing a reliable and robust solution for continuous hot water, especially in regions where outdoor installation is feasible and effective.