10 Best Tankless Water Heaters 2025 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 FOGATTI Natural Gas Tankless Water Heater is a solid choice for those looking for an efficient way to get instant hot water for multiple sources in their home. With a high flow rate of up to 8.1 gallons per minute (GPM) and a heating capability of 180,000 BTU, it can easily meet the demands of a large family. One of its standout features is its outdoor installation, which saves space indoors and is equipped with a remote control panel for convenient indoor operation.

Its ability to operate in various weather conditions, thanks to a powerful DC fan, is a plus for those living in areas with harsh weather. The compact size also makes it easier to install without taking up too much space on your wall. The system boasts an energy efficiency rating of over 0.81, making it an energy-saving option, and it comes with CSA certification, ensuring its safety standards. Furthermore, the precise temperature control ensures that the water temperature remains consistent, which is particularly useful for households with varying water needs.

On the downside, it requires natural gas, so it’s crucial to have access to this fuel type. Also, while the installation is marketed as easy, it might still require professional help due to the involvement of gas lines and specific fittings. Despite these considerations, the product comes with a reassuring 2-year warranty for the entire unit and a 5-year warranty for the heat exchanger, which speaks to its durability. The FOGATTI tankless water heater is well-suited for large families looking for a reliable and efficient source of hot water with the convenience of outdoor installation and remote operation.