The Best Electric Tankless Water Heater in 2023

• Best Overall: Stiebel Eltron Tankless Water Heater
• Best Budget: Electric Tankless Water Heater
• Best Value: Ecosmart ECO 36 36kw 240V Electric Tankless Water Heater
• Editor's Choise: Rheem RTEX-24 24kW 240V Electric

•  Top 9 Best Heat Pump Water Heater 

• Best Gas Water Heater

• Best 16 Tankless Water Heater

• The Best Electric Hot Water Heater

• Best 21 Oil Filled Radiator Heater 

#1: Stiebel Eltron Tankless Water Heater – Tempra 24 Plus

Specs:

• 24kW, 240V
• Requires a minimum recommended electric service of 150 A
• Offers an output water temperature of 68° to 140°F
• Can limit the maximum hot water temperature to 109°F
• 7-Year Leakage and 3-Year Parts Warranties are included with purchase

What we like:

• The Stiebel Eltron Tankless Water Heater – Tempra 24 Plus is a dependable and energy-efficient unit that delivers on-demand hot water without a tank. Its patent-protected Advanced Flow Control technology ensures that the water temperature is maintained at a constant level for consistent comfort. The unit's space-saving design makes it ideal for small homes and apartments. In addition, the eco-friendly unit conserves energy through auto-modulation and the capacity to electronically regulate water flow. The savings monitor also displays the amount of money saved on energy costs.

What we don't like:

• Large homes with high hot water demand may not be suitable for the Stiebel Eltron Tankless Water Heater – Tempra 24 Plus. The unit's small size restricts its ability to simultaneously provide hot water to multiple outlets. Additionally, the unit requires a minimum recommended electric service of 150 A, which could necessitate additional electrical work and costs.

Our Verdict:

The Stiebel Eltron Tankless Water Heater – Tempra 24 Plus is an excellent investment for those in search of a dependable and energy-efficient unit. It provides on-demand hot water, saving space and lowering energy costs. However, it may not be suitable for homes with a high demand for hot water, and additional electrical work may be required. The unit's Advanced Flow Control technology guarantees that hot showers will never again be interrupted, making it a worthwhile investment.

#2: Rheem 18kW 240V Tankless Electric Water Heater

Specs:

• 18kW, 240V
• External digital thermostatic control with LED display
• Most advanced self-modulation
• Durable Copper immersion two heating elements
• Flow Rate- up to 4.4 GPM
• Simple installation – bottom 3/4 inch NPT water connections
• Threaded for easy replacement
• Digital temperature display

What we like:

• The Rheem 18kW 240V Tankless Electric Water Heater is an energy-efficient device that provides on-demand hot water without a tank. Its external digital thermostatic control with LED display accurately maintains the water temperature, ensuring a pleasant showering experience. The unit's most sophisticated self-modulation feature adjusts power to meet hot water demand, ensuring that there is always hot water available. Additionally, the two heating elements of the durable Copper immersion heaters are field-serviceable, making maintenance simple. The unit's flow rate of up to 4.4 GPM is sufficient for the majority of homes, and the bottom 3/4-inch NPT water connections simplify installation.

What we don't like:

• The flow rate of the Rheem 18kW 240V Tankless Electric Water Heater may not be sufficient for larger households with high hot water demands. Additionally, the unit may require additional electrical work, which could incur additional costs. The external digital thermostatic control of the unit may not be as durable as other units' internal control systems.

Our Verdict:

The Rheem 18kW 240V Tankless Electric Water Heater is an excellent investment for those in search of a dependable and energy-efficient unit. It offers on-demand hot water, conserves space, and reduces energy costs. However, it may not be suitable for households with a high demand for hot water, and additional electrical work may be necessary. However, the unit's advanced self-modulation feature and two durable Copper immersion heating elements make it a worthwhile investment for the majority of households.

#3: EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology

Specs:

• 13KW at 240 Volts
• Patented Self Modulating Technology
• Endless On-Demand Hot Water
• Save Space; 90% smaller than traditional tank heaters
• Save Energy; 99% thermal energy efficient
• Dimensions 11.5 x 8 x 3.75 inches
• Provides between 1.3 and 3.1 gallons-per-minute depending on the inlet water temperature

What we like:

• The EcoSmart ECO 11 Electric Tankless Water Heater is a small, energy-efficient unit that provides an endless supply of hot water on demand. Its patented self-modulating technology ensures that the water temperature is maintained precisely within 1 degree of the desired temperature, thereby ensuring a consistent performance. The unit is 90% smaller than conventional tank heaters, making installation on a wall or at the point of use simple. Its thermal energy efficiency of 99% ensures that water is only heated on demand, thereby conserving energy and reducing costs. The unit is perfect for small applications such as a bathroom, a small sink, or a breakroom.

What we don't like:

• Depending on the inlet water temperature, the EcoSmart ECO 11 Electric Tankless Water Heater may not be suitable for larger households or applications with high hot water demand, as it provides between 1.3 and 3.1 gallons per minute. In addition, it may necessitate additional electrical work, which may incur additional costs.

Our Verdict:

Overall, the EcoSmart ECO 11 Electric Tankless Water Heater is an excellent purchase for those in search of a small, energy-efficient, and cost-effective unit for small applications. Its patented self-modulating technology ensures that the water temperature is maintained precisely, and it only heats water on demand, thereby conserving energy and reducing costs. It may not be suitable for larger households or applications with a high demand for hot water, and additional electrical work may be necessary. The unit's endless hot water on demand, space-saving design, and high thermal energy efficiency make it a worthwhile investment for the majority of small applications.

#4: Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY

Specs:

• External adjustable digital thermostatic control with LED display
• Copper immersion two heating elements
• Self-modulating power control
• 1/2 NPT adapters included
• 99.8% energy efficient
• Water-Saver Shower Head - 1.5 GPM
• Flow Rate: up to 3.17 GPM

What we like:

• Adjustable to within one degree Fahrenheit, the Rheem RTEX-13 tankless water heater's digital thermostat provides precise temperature control. The unit is small and simple to install, and it includes all required adapters and connections. The water-saving showerhead is a great feature that conserves water without sacrificing shower quality. In addition, the unit's self-modulating power control is a great feature that ensures it only uses the power it requires, thereby conserving energy.

What we don't like:

• The Rheem RTEX-13 is not designed for high-demand households, which is a drawback. With a maximum flow rate of 3.17 GPM, it may not be sufficient for homes with multiple bathrooms or larger households. In addition, the unit requires a 240V power source, which may not be available in all residences.

Our Verdict:

The Rheem RTEX-13 is an excellent option for small homes or single-bathroom installations. It provides precise temperature control, straightforward installation, and superior energy efficiency. If you have a larger household or multiple bathrooms, you may wish to consider a model with a larger capacity. Overall, we endorse the Rheem RTEX-13 as a dependable, energy-efficient, and user-friendly tankless water heater.

 #5: EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology

Specs:

• Amperage (amps): 75
• Activation flow: 0.3 GPM
• Flow Rate @ 35 F Rise (gallons/min): 3.51 gal (US)/min
• Compatible with 2 X 40 AMP (DP) breakers and 2 X 8 AWG wire
• Lifetime warranty for residential use

What we like:

• Highly resilient and user-friendly
• Superior self-modulating technology that reduces water heating costs by up to 60%
• residential products covered by a warranty good for life

What we don't like:

• No information provided regarding the unit's size and dimensions, which could impact installation options.

Our Verdict:

The EcoSmart ECO 18 Electric Tankless Water Heater is an excellent choice for those wishing to save money on water heating expenses. Its self-modulating technology adjusts the power consumption to meet the demand for hot water, resulting in substantial energy savings. In addition, the product is extremely durable and includes a lifetime warranty for residential use. However, it would have been preferable to include information about the unit's size and dimensions to help customers determine if it meets their installation requirements.

• Size: Electric tankless water heaters come in a variety of sizes, and you must select the appropriate size for your hot water needs. A small unit can provide hot water for a sink or shower, whereas a larger unit can provide hot water for the entire residence.
• Electric tankless water heaters are typically more energy-efficient than conventional water heaters with tanks. Consider models with high energy efficiency ratings to reduce your energy costs.
• Flow Rate: The flow rate of an electric tankless water heater is the amount of hot water it can produce within a given time frame. It is essential to select a model with a flow rate that corresponds to your household's hot water requirements.
• Electric tankless water heaters require professional installation for installation. Ensure that a licensed and experienced plumber is hired to install the unit correctly.
• Choose a well-known and trustworthy brand when purchasing an electric tankless water heater. A reputable company will provide you with high-quality goods and excellent customer service.

What is a tankless electric water heater and how does it function?

A tankless electric water heater heats water as it passes through the unit. There is no need for a cumbersome storage tank, making the appliance more space- and energy-efficient.

How long do tankless electric water heaters last?

With proper maintenance and care, tankless electric water heaters can last up to 20 years.

Can tankless electric water heaters provide enough hot water for the entire home?

Yes, electric tankless water heaters can provide hot water for the entire home, but you must select a model with a high flow rate to meet your household's hot water requirements.

How much does the installation of a tankless electric water heater cost?

The cost of installation varies based on the installation's complexity and the unit's location. Typical installation fees range between $500 and $1,500.

Are electric tankless water heaters more energy-efficient than traditional tank water heaters?

Yes, tankless water heaters are typically more energy-efficient than conventional water tanks. They only heat water when it is required, thereby eliminating standby heat loss and decreasing energy consumption.

Electric tankless water heaters are an excellent option for households desiring a constant supply of hot water without a bulky storage tank. Consider the water heater's size, energy efficiency, flow rate, installation requirements, and brand reputation prior to purchase. By selecting the right model and maintaining it properly, you can enjoy on-demand hot water for many years.