10 Best Tankless Water Heaters 2025 in the United States

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 Rheem RTGH-95DVLN-3 is a solid choice for those in need of a tankless water heater, especially for residential use. With a flow rate of up to 9.5 gallons per minute, it can easily meet the hot water demands of larger households or simultaneous usage across multiple fixtures. Its energy efficiency rating of 0.93 ensures that it operates economically, which can translate to lower energy bills over time.

One standout feature is the integrated digital display, making it easy to monitor and adjust temperature settings, which range from 100 to 140 degrees Fahrenheit. This adaptability allows users to find a comfortable temperature that suits their needs. Additionally, the natural gas fuel type is generally more efficient than electric options, further enhancing its appeal.

On the downside, installation can be a bit tricky if you're not familiar with gas appliances. It requires a wall-mounted setup and adequate venting, which might necessitate professional installation, adding to the cost. The warranty coverage, while decent with a 1-year labor and 5-year parts warranty, might be considered lacking compared to competitors that offer longer terms.

Another point to consider is that the heater's weight (about 59.9 pounds) and size (17.7”W x 23.7”H) may pose challenges during installation, especially in tighter spaces. It’s essential to ensure that your home can accommodate this unit before purchasing.

The Rheem RTGH-95DVLN-3 is a robust option for families seeking efficient hot water solutions. Its high flow rate and energy efficiency make it a strong contender in the tankless water heater market, but potential buyers should weigh the installation requirements and warranty duration against their specific needs.

The Rinnai RX160iN tankless water heater is a solid choice if you want a compact and efficient unit that can serve multiple fixtures at once. It offers a high flow rate of up to 9 gallons per minute, which means it can comfortably supply hot water to about six taps simultaneously — great for larger households or homes with higher hot water demands. Its energy efficiency is excellent, with a UEF rating of 0.97, helping you save on energy bills compared to traditional water heaters.

One of its strong points is its flexibility: you can install it indoors or outdoors (with the necessary venting kit), and it works with both natural gas and propane thanks to its Smart Sense gas control system. The unit is also fairly compact, roughly the size of a small suitcase, making it easier to fit into limited spaces. Temperature rise capabilities allow it to deliver water heated up to 140°F, which suits most residential needs. Additionally, it includes handy features like a Quick Flush for easier maintenance and optional WiFi control if you want smart home integration.

Professional installation is recommended due to the complexity of gas plumbing and venting, which could add to initial costs. Also, the unit requires specific venting accessories for outdoor use, so check your installation location carefully. Rinnai is known for solid customer service. This unit is ideal for homeowners looking for a reliable, energy-efficient, and versatile tankless water heater that can handle multiple demands without taking up much space.