10 Best Electric Water Heaters 2025 in the United States

The Rheem 18kW Tankless Electric Water Heater is a solid choice for those looking for an efficient and space-saving solution to hot water needs. Its compact size (14.5"W x 18.25"H) makes it ideal for homes with limited space, and the wall-mount design allows for easy installation. With a maximum flow rate of 4.4 gallons per minute, it can adequately serve smaller households or apartments, meeting the demands for showers and other hot water needs simultaneously.

One of the key strengths of this model is its impressive energy efficiency, boasting a 99.8% efficiency rating. This not only helps reduce energy bills but also makes it an eco-friendly option. The external digital thermostatic control with LED display allows for precise temperature adjustments, which can be a great feature for users who value control over their hot water supply.

There are some considerations to keep in mind. While the recovery rate is decent for its size, larger families might find the output insufficient during peak usage times. Additionally, installation might require a professional, especially if your existing plumbing does not match the specifications. Some customers have also noted that while the unit is generally reliable, it may not handle extremely high volumes of hot water demand as effectively as larger tank systems.

The warranty and customer service provided by Rheem is a plus, offering peace of mind should any issues arise. Safety features are also included, which is essential for households with children. The Rheem 18kW Tankless Electric Water Heater is best suited for smaller homes or apartments focused on energy efficiency and compact design, but larger families may need to consider their hot water demands before making a decision.

The Stiebel Eltron Tempra 24 Plus is a tankless electric water heater designed to provide on-demand hot water without the drawbacks of traditional storage heaters. One of its standout features is the Advanced Flow Control technology, which maintains a steady water temperature, ensuring that showers or hot water tasks can be completed without interruption. This makes it highly suitable for households where multiple hot water needs are common.

In terms of size, its compact design allows for easy installation in various spaces, making it a great choice for homes with limited installation areas. The unit's energy efficiency is another strong point; it uses auto-modulation to save energy and even includes a savings monitor to track energy costs, appealing to environmentally-conscious users and those looking to reduce utility bills.

The Tempra 24 Plus also offers user-friendly operation with digital temperature controls and presets, making it easy for anyone to set their desired hot water temperature. With a decent warranty of 7 years for leaks and 3 years for parts, customers can expect reliable long-term performance. There are some considerations to keep in mind. The heater requires a minimum recommended electric service of 150 amps, which may necessitate electrical upgrades in older homes. Additionally, while it can provide hot water continuously, its maximum temperature limit of 140°F might not be sufficient for all users, especially in areas with colder climates or higher hot water demands. The Stiebel Eltron Tempra 24 Plus is an excellent choice for those seeking an efficient, space-saving solution for hot water but may require additional considerations for installation and service requirements.

The BOSCH Electric Mini-Tank Water Heater Tronic 3000 T 2.5-Gallon offers a compact and convenient solution for immediate hot water needs under your sink. With a capacity of 2.5 gallons, it is suitable for supplying hot water to a single or two sinks simultaneously, making it perfect for small households or point-of-use applications. The product's thermal efficiency stands impressively high at 98%, ensuring minimal energy loss and better performance.

The fast recovery rate eliminates long waits, providing on-demand hot water promptly. Measuring at 13.75 inches in width and height, and 10.75 inches in depth, its compact size allows for flexible installation on the shelf, wall, or floor, making it adaptable to different spaces. Installation is straightforward with a 36-37 inch cord that plugs into a standard 120-volt outlet, further aiding its versatility.

The water heater is made with premium glass-lined material, promising durability and a longer service life. On the downside, with only a 2.5-gallon capacity, it might not be suitable for larger households or high-demand applications. The maximum temperature is capped at 140 degrees Fahrenheit, which may not be sufficient for some users with specific hot water needs. It comes with a 6-year warranty on the unit and a 2-year warranty on parts, which is decent but might not offer the most extended coverage available in the market.