10 Best Electric Tankless Water Heaters 2026 in the United States

The Rheem RTEX-24 24kW 240V Electric Tankless Water Heater offers solid performance for households looking for a reliable source of on-demand hot water. One of its strong points is the flow rate, with the capacity to deliver up to 5.9 gallons per minute, which should be sufficient for multiple outlets running simultaneously. The unit's self-modulating power control and adjustable digital temperature display are user-friendly features that allow for precise temperature adjustments and energy savings, contributing to its high energy efficiency rating of 99.8%. This makes it an economical choice in the long run.

Additionally, the unit is compact, with dimensions of 17.63 inches wide and 18.25 inches high, making it easier to install in various spaces. It is designed for wall mounting, which can save floor space in tight utility areas. However, the power requirements are quite high at 24kW and 240V, which means it might require an upgrade to your electrical system if your current setup isn't compatible. This could add to the installation cost and complexity.

The unit also comes with necessary fittings and aerators, which is a plus. In conclusion, the Rheem RTEX-24 is an efficient and high-capacity option suitable for those who need consistent hot water and have the necessary power infrastructure.

The Stiebel Eltron Tankless Heater – Tempra 36 Plus is a reliable choice for on-demand hot water. One of its main strengths is the ability to provide continuous and unlimited hot water, making it ideal for households with high hot water needs. Its sleek design is another advantage, as it saves space and requires no venting, making installation easier, especially in compact areas. The unit operates quietly due to its electronic switch activation, which can be a significant benefit for maintaining a peaceful home environment.

With a power requirement of 27 kW and 208 volts, ensure your home’s electrical system can support this heater, as it demands substantial power. This model also includes a LED display for easy monitoring and control, adding to user convenience. The copper-sheathed heating element housed in a copper cylinder ensures durable performance. The maximum flow rate is 1.5 gallons per minute, which might be limiting for larger households or simultaneous usage in multiple locations. However, the energy efficiency of this model is high, potentially saving on energy costs over time.

The warranty is another strong point, offering 7 years on leakage and 3 years on parts, which reflects confidence in the product's durability. Weighing 19 pounds and with dimensions of 16.63 inches wide by 14.5 inches high, it’s relatively easy to handle and install. This unit is best suited for small to medium-sized households or specific areas needing hot water on demand.

The Stiebel Eltron Tempra 12 Trend is a compact and efficient electric tankless water heater designed to provide continuous hot water on demand without the energy waste of traditional water heaters. With a power rating of 12 kilowatts and operating on 240 volts, it’s best suited for smaller households or point-of-use applications rather than large homes, because its flow rate and heating capacity are moderate. It can deliver water temperatures from 68°F up to 140°F, which covers most household hot water needs. The unit requires a minimum recommended 100-amp electric service, so you’ll want to ensure your home’s electrical panel can support it before installation. Its sleek wall-mounted design saves space and doesn’t require venting, making it ideal for tight areas.

The built-in digital LED display lets you easily monitor and control water temperature, and the heater operates silently, which is a nice plus for comfort. An internal copper heating element ensures reliable heat output and durability. One of its strengths is the energy-saving auto-modulation feature, which adjusts power use based on demand, helping reduce electricity bills. However, the 12 kW power means it might struggle to supply multiple outlets simultaneously at high flow rates, so it’s less suitable if you need hot water in several places at once. Installation may also require professional help due to hard wiring and electrical requirements.

The product comes with a solid 7-year warranty against leakage and 3 years on parts, providing peace of mind. For those seeking an energy-efficient, space-saving electric water heater for a small household or single fixtures, the Tempra 12 Trend offers a reliable choice, though larger homes might require a more powerful model.