10 Best Tankless Water Heaters 2026 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.

Additionally, the unit boasts a high energy efficiency factor of 0.98, translating to significant energy savings. The option for WiFi connectivity through the Control-R module adds to its smart appeal, although this module is not included with the water heater. Installation should be performed by a professional, which adds to the initial cost but ensures proper setup and operation. The unit's temperature rise and maximum output of 199,000 BTU make it suitable for demanding environments, but users should ensure their home’s infrastructure supports this capacity.

The warranty and support are implied to be robust through Rinnai's recommendation for professional installation and their central app for service and troubleshooting. This tankless water heater is best suited for those needing a high-performance, energy-efficient solution for a large household.

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.

This model is powered by either natural gas or propane, catering to various fuel types, which adds to its versatility. The compact design, similar to a small suitcase, helps save space in your home, a feature that many customers find appealing.

Professional installation is recommended, which could add to the cost and effort involved in setting it up. While the Rinnai Central App offers support for setup and troubleshooting, the WiFi control module is sold separately, which might be an inconvenience for users looking for a fully integrated smart home solution. Potential buyers should evaluate their specific hot water needs against the maximum temperature output of 140 degrees Fahrenheit. The warranty and support options are also crucial to consider, as they ensure peace of mind and assistance should any issues arise.

The Rinnai RX130iN tankless water heater is a versatile and efficient choice for those looking for a reliable hot water supply without the bulk of a traditional tank. It offers a solid flow rate of up to 7.1 gallons per minute, which means it can comfortably handle up to four fixtures running at the same time for a typical family’s needs. Its energy efficiency is impressive, with a Uniform Energy Factor (UEF) of 0.97, helping to keep your energy costs down while being environmentally friendly. This model runs on either natural gas or propane, giving you flexibility depending on what fuel source you have available.

Installation is quite adaptable—it can be mounted indoors or outdoors thanks to the Versa Vent system, but proper professional installation is recommended to ensure safety and optimal performance. The unit is compact, roughly the size of a small suitcase, so it won’t take up much space. Temperature can be controlled up to 140°F, suitable for various household uses. The inclusion of features like the Smart Sense gas control and Quick Flush function makes maintenance easier and improves operation. The WiFi control module is sold separately if you want remote management, and the heater weighs 54 pounds, which is something to consider for mounting.

With a strong customer rating of 4.6 out of 5 stars and backing from Rinnai’s support and warranty system, this model is well suited for homeowners who want dependable, efficient hot water with flexible fuel and installation options.