10 Best Tankless Water Heaters 2026 in the United States

The Rheem RTEX-24 24kW 240V Electric Tankless Water Heater offers a robust solution for continuous hot water supply with its impressive flow rate of up to 5.9 gallons per minute, making it suitable for households with moderate to high hot water demands. One of its standout features is the 99.8% energy efficiency, which helps in reducing energy costs and promoting eco-friendliness. The electric fuel type simplifies installation and maintenance compared to gas models, although it does require a 240V electrical connection, which some homes may need to upgrade to accommodate.

The compact dimensions (17.63”W x 18.25”H x 3.5”D) and wall-mount design make it space-efficient and ideal for small utility areas, while the digital temperature display and ON/OFF dial control provide ease of use and precise temperature adjustments. Additionally, the self-modulating power control enhances efficiency by only using the necessary amount of power based on the water flow rate.

However, the temperature rise might be limited during peak usage in colder climates, potentially requiring additional units for larger homes. Potential buyers should consider the installation requirements and whether their household electrical setup can support the unit. Those looking for a reliable, energy-efficient, and continuous hot water supply will find the Rheem RTEX-24 a compelling option, especially in moderate climates and homes with appropriate electrical infrastructure.

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 Rheem RTG-70XLN-3 tankless water heater is designed for outdoor installation and runs on natural gas. It offers a maximum flow rate of 7 gallons per minute, which is sufficient to supply continuous hot water for an entire house, even when multiple applications are in use. This makes it a great option for families or homes with high hot water demand. Its high efficiency means it only operates when needed, helping to save on energy costs. Additionally, the water-saving setting can save up to 1,100 gallons of water annually, which is a bonus for those looking to be more environmentally conscious.

The hot-start programming feature ensures that you won't experience cold-water bursts, adding to user comfort. The unit is compact, with a 19% smaller size and 22% reduced weight compared to previous models, making installation easier and saving space. It also comes with useful features such as a self-diagnostic program and freeze protection, which enhance reliability and ease of maintenance.

As a non-condensing model, it may not be as energy-efficient as condensing units, which could result in slightly higher operating costs. Additionally, while the outdoor installation style is convenient for some, it may not suit all home layouts. For those prioritizing high flow rates and efficiency in a natural gas heater, the Rheem RTG-70XLN-3 is a strong contender, though potential buyers should consider the implications of its non-condensing nature and installation requirements.