10 Best Electric Water Heaters 2025 in the United States

The Rheem RTEX-24 electric tankless water heater is a strong candidate for those seeking an efficient and space-saving solution for continuous hot water. With a maximum flow rate of up to 5.9 gallons per minute (GPM), it’s well-suited for smaller households or apartments where immediate hot water is a necessity. Its self-modulating power control ensures that the energy consumption aligns with your hot water usage, contributing to its impressive energy efficiency rating of 99.8%. This makes it a cost-effective choice for anyone looking to lower their utility bills while still enjoying ample hot water on demand.

The adjustable digital temperature display with ON/OFF dial control is user-friendly, making it easy to set the desired temperature. Additionally, the compact design (17.63" x 18.25") allows for wall mounting in tight spaces, a significant advantage for those with limited installation options.

However, there are a few drawbacks to consider. The unit requires a considerable electrical installation, including a dedicated 240V outlet, which might entail additional setup costs if you don't already have the proper wiring in place. While the maximum flow rate is decent, larger families or homes with multiple simultaneous hot water demands (like multiple showers running at once) may find it insufficient. Also, it lacks a traditional tank, which means there’s no hot water storage; if the demand exceeds its flow rate, you might experience short interruptions.

The Rheem 8kW 240V Tankless Electric Water Heater is a compact and energy-efficient option for providing on-demand hot water in smaller households or for limited use points like a single bathroom or kitchen sink. Its tankless design means it heats water continuously, so you don’t have to wait for a tank to refill, which helps save space and potentially reduces energy waste compared to traditional tank heaters. The unit has an 8kW power rating and can deliver a flow rate of up to 1.95 gallons per minute, making it suitable for low-to-moderate hot water needs but likely not enough for whole-house use or multiple simultaneous showers.

The adjustable digital temperature display and ON/OFF dial control offer easy temperature customization. At just over 12 inches tall and 8 inches wide, it fits well in tight spaces and mounts on a wall, which is great if installation space is limited. The maximum operating pressure is 150 PSI, which is standard but something to confirm with your home plumbing setup.

Rheem is a reputable brand known for reliable water heaters, which adds confidence in durability. This unit is a practical choice if you need a small, efficient electric water heater for point-of-use applications, though it may not meet the demands of larger households or multiple simultaneous users.

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.