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 Rheem RTG-95DVLN-3 is a natural gas tankless water heater designed for indoor use, offering a strong flow rate of 9.5 gallons per minute. This means it can supply enough hot water to run multiple fixtures at once—like a shower and dishwasher—making it suitable for medium to larger households. Its energy efficiency rating of 0.82 is decent for this type of non-condensing model, helping save on energy costs by only heating water on demand. The heater also includes a water-saving setting that claims to save up to 1,100 gallons annually, which is a nice bonus for reducing water waste.

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.