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Best Electric Tankless Water Heater: Top Picks for 2025

Electric tankless water heaters are an excellent investment for homeowners seeking energy efficiency, space savings, and continuous hot water supply. These devices heat water directly as it flows through the unit, eliminating the need for a storage tank and reducing standby energy losses. The best electric tankless water heaters combine high performance, reliability, and advanced features to meet varying household demands.

When selecting an electric tankless water heater, consider the flow rate, measured in gallons per minute (GPM), which determines how much hot water the unit can deliver at once. Another critical factor is the temperature rise, or how much the heater can increase the water temperature based on the incoming cold water temperature. Energy efficiency, measured by the Uniform Energy Factor (UEF), indicates how effectively the unit converts electricity into heat. Additionally, installation requirements, such as electrical capacity and plumbing modifications, should be evaluated before purchase.

Top Electric Tankless Water Heaters of 2025

The following are some of the best electric tankless water heaters available in 2025, based on performance, customer reviews, and expert recommendations.

1. Stiebel Eltron Tempra 36 Plus

The Stiebel Eltron Tempra 36 Plus is a high-performance unit known for its advanced flow control technology, which adjusts the water flow to maintain a consistent temperature. With a flow rate of 3.6 GPM, it is suitable for small to medium-sized households. The unit features a compact design, digital temperature control, and a self-modulating energy system for optimal efficiency.

2. EcoSmart ECO 27

The EcoSmart ECO 27 is a popular choice for its affordability and efficiency. It offers a flow rate of 6.6 GPM, making it ideal for larger households. The unit uses self-modulating technology to adjust power consumption based on demand, reducing energy waste. Its compact size and simple installation make it a practical option for many homes.

3. Rheem RTEX-18

The Rheem RTEX-18 is a reliable and easy-to-install electric tankless water heater. With a flow rate of 4.4 GPM, it is suitable for small to medium-sized homes. The unit features digital temperature control, a durable copper heating element, and a compact design. It is also backed by a 5-year warranty, ensuring long-term reliability.

Comparison Table

Model	Flow Rate (GPM)	Temperature Rise (°F)	UEF	Price (USD)
Stiebel Eltron Tempra 36 Plus	3.6	77	0.99	1,200
EcoSmart ECO 27	6.6	45	0.99	600
Rheem RTEX-18	4.4	65	0.99	500

Installation and Maintenance Tips

Proper installation and maintenance are crucial for the optimal performance and longevity of your electric tankless water heater. Ensure that the unit is installed by a licensed professional to meet electrical and plumbing codes. Regular maintenance, such as descaling the heating elements and checking for leaks, can prevent performance issues and extend the unit’s lifespan.

For more information, visit the official websites of Stiebel Eltron , EcoSmart , and Rheem .

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