10 Best Electric Tankless Hot Water Heater 2026 in the United States

The Rheem RTEX-24 is a solid choice for anyone looking for an electric tankless water heater, particularly for residential use. One of its key strengths is its impressive flow rate of up to 5.9 gallons per minute, making it suitable for medium to large households where multiple hot water outlets may be used simultaneously. Its self-modulating power control ensures that the heater adjusts energy use based on demand, which can help in energy savings. With an energy efficiency rating of 99.8%, this unit can significantly reduce your utility bills compared to traditional tank heaters.

The Rheem 18kW 240V Tankless Electric Water Heater is designed to offer an on-demand hot water solution for homeowners looking to save space and energy. With a flow rate of up to 4.4 gallons per minute (GPM), it can efficiently supply hot water for multiple outlets at once, making it suitable for medium-sized households or apartments. One standout feature is its external digital thermostatic control with a precise +/- 1 degree accuracy, allowing users to easily set their desired water temperature.

The Stiebel Eltron Tempra 29 Plus is a powerful electric tankless water heater designed to provide a continuous and unlimited supply of hot water on demand. With a maximum flow rate of 3 gallons per minute, it is suitable for households needing hot water for multiple faucets or a shower simultaneously, but might be tight for larger families running several fixtures at once. Its temperature rise capability ensures hot water even in colder climates, and the unit offers two temperature memory presets for quick, personalized settings.