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 Stiebel Eltron 239223 Tempra 29 Plus is an electric tankless water heater offering an efficient and reliable solution for on-demand hot water. One of its most notable strengths is its ability to provide a continuous and unlimited supply of hot water, making it ideal for households with high hot water demands. With a sleek and compact design, it saves space and does not require venting, which simplifies the installation process.

Additionally, it features two temperature memory presets for personalized adjustment and an LED display for easy monitoring. However, the installation requires a hard-wired 240 or 208-volt electric service and three separate dedicated 40 amp breakers with 8 gauge copper wiring, which could be a drawback for homes not already equipped with this setup. It has a maximum draw of 28,800 watts at 240 volts or 21,600 watts at 208 volts, emphasizing its substantial power requirement.

The maximum flow rate is 3 gallons per minute, which may be limiting if multiple hot water outlets are used simultaneously. Certified by CSA, NSF, UL, and ANSI, it ensures safety and reliability. At 24 pounds and dimensions of 16.63 inches wide by 14.5 inches high, it is relatively easy to install and manage. Given its high power capacity and specific installation requirements, this water heater is best suited for larger homes or those with significant hot water needs and an adequate electrical setup.