10 Best Best Whole House Electric Tankless Water Heater of 2025

Tested and Reviewed: Top 10 Best Whole House Electric Tankless Water Heater deals with expert ratings from 8.1 to a perfect 10

June 2025 Edition

Editor's Choice

9.7

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EcoSmart

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

40% Off

Editor's bottom line:

“This best whole house electric tankless water heater is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Endless On-Demand Hot Water; Consistent hot water when you need it that never runs out; Continuously monitored water temperature and controlled flow rates ensure efficiency and consistent performance within 1 degree of selected temperature.Amperage Draw : 54 A.Special Features: Energy Efficient
Save Space; EcoSmart tankless electric water heaters are 90% smaller than traditional tank heaters; may be installed on wall or at point of use; Dimensions 11.5 x 8 x 3.75 inches
Save Energy; EcoSmart tankless electric water heaters are 99% thermal energy efficient; Only heats water when called unlike a tank heater that maintains water temperature even when not being used.
EcoSmart ECO 11 Sizing; 13-kilowatt tankless electric water heater ideal for providing hot water for a bathroom, small sink, office breakroom and other point-of-use or low-flow applications; provides between 1.3 and 3.1 gallons-per-minute depending on the inlet water temperature; refer to the sizing guide to select the proper solution

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Picked by 236 people today

9.5

Ranein

Ranein Electric Tankless Water Heater, 18kW 240V on Demand Instant Endless Water Heater with LED Temperature Display for Residential Whole House Shower, Space Saving

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Main Highlights

NOTE: Make sure this water heater tankless is sized for your hot water needs: 18 kW; 240 volts; circuit breaker required 2 x bipolar 40 amps; unit dimensions 13.8" x 3.1" x 18.7"; water connection 3/4" NPT.
SAVE: Compared to tank-type water heaters, electric tankless water heater don't require preheating. There's no energy consumption when not in use. It saves 60% of heating costs. Additionally, it's more compact and can be installed anywhere.
POWERFUL: This electric water heater's on-demand thermal efficiency reaches up to 99%. With a flow rate of up to 4.3GPM, it's suitable for 2-3 usage points throughout the house. No waiting for preheating. Provides endless ample hot water.
SIMPLE: The endless hot water heater electric features knob controls and an LED display. With an adjustment range from 86°F to 131°F in 1°F increments, just simply set the temperature and enjoy stable and ample hot water.
SAFE: The instant electric tankless water heater is applied with multiple protections, like leakage protection, overheating protection, and drop test, damp proof, every unit electric tankless water heater goes through strict tests to ensure 100% safety and it is listed by CSA.

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9.5

Save 31%

Stiebel Eltron

Stiebel Eltron Tankless Water Heater – Tempra 20 Plus – Electric, On Demand Hot Water, Eco, White

31% OffFree Shipping

Main Highlights

CONTINUOUS FLOW Advanced Flow Control patented technology invented by Stiebel Eltron, automatically maintains water temperature for constant comfort. Itll reduce flow slightly if hot water demand exceeds capacity. Hot showers will never be interrupted again
SPACE & ENERGY SAVER Its small, sleek white design saves space yet still provides endless hot water for your whole house, and no venting is required. Eco friendly unit saves energy with auto-modulation and the ability to electronically control water flow. Savings monitor even shows how much you save on energy costs
EASY OPERATION Electronic switch activates the hot water heater and its noise free while in use. Has a digital temperature display and preset temperature and memory buttons, while the interior solid copper heating system does all the power work
TEMPRA 20 PLUS This specific model is 19.2kW, 240V, requires a min recommended electric service of 125 A, and offers an output water temperature of 68° to 140°F. Check our guides below to compare features of our various Trend and Plus models, each available in different kW levels
WARRANTIES INCLUDED Stiebel Eltrons top-rated electric tankless water heaters perform with the highest standards for comfort and reliability. Our 7-Year Leakage and 3-Year Parts Warranties are included with purchase

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9.2

Ranein

Ranein 13kW Tankless Electric Water Heater, 240V on Demand Instant Endless Water Heater with LED Temperature Display for Whole House Shower

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Main Highlights

NOTE: Make sure this on-demand electric water heater is sized for your hot water needs 13kW; 240 volts, circuit breaker required 1 x 60 amps; unit dimensions 10.7" x 7.9" x 2.8"; water connection 1/2" NPT. Note: No need to disassemble the housing for wiring.
SAVE: Compared to tank-type water heaters, tankless water heaters don't require preheating. There's no energy consumption when not in use. It saves 60% of heating costs. Additionally, it's more compact and can be installed anywhere.
POWERFUL: The 13kW tankless electric water heater's thermal efficiency reaches up to 99%. With a flow rate of up to 3.1 GPM, it's suitable for 1-2 usage points throughout the entire house. No waiting for preheating. Provides endless ample hot water.
SIMPLE: This electric instant tankless water heater features knob controls and an LED display. With an adjustment range from 86°F to 131°F in 1°F increments, you simply set the temperature and enjoy stable and ample hot water.
SAFE: The electric hot water heater heating elements are separated from water to prevent scale buildup. It has features like leakage protection, overheat protection, and automatic shutdown to ensure safety during use.

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9.0

Orbek

18kW Tankless Water Heater Electric, ORBEK 240 Volt On Demand Instant Hot Water Heater, with LED Digital Display, ETL Certified, Up to 4.8 GPM for 2-3 Point of Use throughout the Whole House

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Main Highlights

Instant Hot Water Supply: Orbek electric tankless water heater can provide up to 4.8 GPM of endless hot water on demand and ensure comfortable hot water for 2-3 points of use simultaneously throughout the whole house
High Energy Efficient: With water-electricity separation, this hot water heater reduces scale and corrosion. It delivers endless hot water in just 3 seconds with 98% efficiency, cutting electricity costs by up to 60%
Comprehensve Security Protection: Orbek tankless water heater features several safeguards, including leakage, over-temperature, high voltage, and dry-heating protection. Each unit undergoes strict testing and is ETL certified to ensure 100% safety for you and your family
LED Digital Display: Clear and easy to read, with real-time updates. Powered by an intelligent temperature control chip that performs 200,000 calculations per second, this instant tankless water heater ensures precise temperature adjustments within 1, supports a wide range from 86-140, and delivers a steady supply of hot water
Easy to Install: Orbek 18KW tankless water heater electric requires 2 x 240V/40A two-pole breakers and 2 sets of 8 AWG wires to be connected. Both the inlet and outlet use standard 3/4" NPT male connectors, making it compatible with most household water pipes. Its compact size of 14.2"H x 9.5"L x 3.1"W takes up almost no space
After-Sale Service: We offer 2 years returns & exchange support along with long-term professional technical consulting services

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8.8

ECOTOUCH

Electric Tankless Water Heater, ECOTOUCH 27kW on Demand Hot Water Heater Electric 240V Instant Tankless Hot Water Heaters Point of Use with ETL Certificated for Whole House Shower ECO270S

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Main Highlights

Instant Endless Hot WaterWith a highly powerful 27kW heating system, the tankless water heater electric 240V delivers sufficient instant & endless hot water of 125 or higher in seconds, without waiting for preheating, no temperature fluctuation and never runs out of hot water during long shower, allowing you and your family to enjoy comfortable hot shower. Also, instant hot water heater ECO270S is ideal for wholehouse use, including shower, sink faucets, dishwasher, washing machine, etc
Convenient to UseThe 27kW on demand hot water heater electric is equipped with a user-friendly touch control panel, making temperature setting such an easy job. Best of all, the screen shows you all useful information so that you get clear understanding of working status of the electric tankless water heater 240V any time. Just set your desired temp and let the smart tankless hot water heater to handle the rest effortlessly
Safe and DurableThis tankless water heater is equipped with multiple protections, including leakage protection, over-temp protection, high voltage protection and dry-heating protection. Rest assured, every piece of electric water heater ECO270S goes through strict tests , listed by ETL and qualified for UL, which ensures 100% safety of yours and families. Inner water and electricity lines are designed to run separately so as to avoid leakage risk and scale build up. Minimized maintenance needed, you can count on its outstanding performance for years to come
Energy SavingFeatured with advanced self-modulation heating system, this instant water heater automatically adjusts exact power input based on temp setting and water flow rate real time, for exmple, less power will be input by the electric hot water heater when you reduce water flow, thus, you will get stable and comfortable experience without risk of scalding, ensuring optimal balance between comfort and energy efficiency. Also, optimal energy efficiency of 99.8% saves up to 60% on electric bill compared to a typical huge tank water heater
Point of Use Water HeaterThe white & sleek tankless hot water heater ECO270S is compact and stylish, making it possible to install point of use to cut down on waiting for hot water and avoid water & energy waste, which is a perfect companion of shower and sink faucet. Please make sure this water heater is the right size for you: 27 kW @ 220~240 Voltage, plumbing connections :3/4" NPT, 113 Amp Max Draw; requires 3X40AMP Double Pole Breaker, 3X8AWG/2 wires with Grounding and an electric service panel of 200 AMPs, please consult a professional electrician before purchase

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8.6

WINTEMP

Electric Tankless Water Heater WINTMP, 27kW 240V Whole House Hot Water Supply Shower, Self-Regulating on-Demand Hot Water, with LED Temperature Display and WIFI Control, Space-Saving WN27

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Main Highlights

Important NoteEnsure this tankless water heater meets your installation requirements. It is rated at 27KW - 240 Volts with a maximum amperage of 113A. It requires 3 x 40 Amp DP breakers and 3 x 8/2 AWG wiring with ground, with a recommended 250A household power supply. The unit dimensions are 9.7 (W) x 14 (H) x 3.4 (D), the water connection is 3/4" NPT
Stable Water Temperature Automatically adjusts energy consumption based on incoming water temperature and flow rate to ensure maximum efficiency, continuous stable temperature, and optimal power usage. The digital temperature display ranges from 86°F to 140°F. It provides 2.7 to 6.5 gallons of hot water per minute, It is perfect for residential shower use, eliminating the need to wait for preheating. Theres no longer any concern about running out of hot water in the tank, and you wont experience temperature fluctuations during your shower
Energy SavingThe self-regulating technology adjusts power input based on real-time flow and temperature settings. When the water flow decreases, the system reduces power usage, and when not in use, it consumes no energy, achieving up to 99% energy savings, suitable for 2-4 usage points in the home
Space SavingThe WN27 features a wall-mounted compact design, occupying 90% less space compared to traditional tank water heaters. It is suitable for tight areas and can be easily installed anywhere. It provides an endless supply of hot water in a short time without the need to wait for preheating. Equipped with remote WIFI control, you can adjust the temperature without being near the water heater
Safe UsageSafety is always a top priority for WINTEMP. Equipped with multiple protection features such as leakage protection, overheat protection, and dry-fire protection, it ensures your safety, allowing you to enjoy hot water anytime, anywhere with peace of mind. 2-year warranty period.

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8.3

Rheem

Rheem 18kW 240V Tankless Electric Water Heater, Gray

Free Shipping

Main Highlights

External digital thermostatic control with LED display (+/1 degree accuracy)
Most advanced self-modulation, adjust power to meet hot water demand
Durable Copper immersion two heating elements, field Serviceable. Flow Rate- up to 4.4 GPM
Simple installation bottom 3/4 inch NPT water connections
Threaded for easy replacement, simple installation, digital temperature display

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8.1

Rheem

Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray

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Main Highlights

ON/OFF Dial Control with adjustable digital temperature display
Self-modulating power control
24kW Model Flow Rate: up to 5.9 GPM for RTEX-24
Bottom 3/4" NPT water connections
On demand, consistent and continuous hot water

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8.1

Westinghouse

Westinghouse 27kW 240V Tankless Water Heater Electric, 6.3GPM Instant Hot Water Heater, Wi-Fi Enabled, Self Modulating for Whole House Shower, APOLO-27k

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Main Highlights

: up to 6.3 GPM for APOLO-27k. Activation flow: 0.79 GPM. Amperage (amps): 113. The product works and is compatible with 3 X 40 AMP (DP) breakers and 3 X 8 AWG wire.Bottom 3/4" NPT water connections
: With remote WIFI control, you can adjust the temperature without being near the water heater. The temperature can also be controlled with a rotary button, so you can easily adjust the temperature in 1° increments from 86°F to 140°F
: Enjoy continuous, stable hot water without waiting for preheating or worrying about temperature fluctuations. It's suitablefor whole house use
: Westinghouse tankless water heater is ETL certified, equipped with leakage, overheat, and dry-fire protection, The separated heating element minimizes scale and corrosion, ensuring better performance and low maintenance
: Electric Tankless water heaters are typically smaller than traditional tank water heaters, which can be wall-mounted, and more compact in size. Ideal for small apartments, its perfect for showers, sinks, dishwashers, washing machines, etc

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Our Best Overall Choice

Best Choice

9.7

EcoSmart

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

40% Off

Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Endless On-Demand Hot Water; Consistent hot water when you need it that never runs out; Continuously monitored water temperature and controlled flow rates ensure efficiency and consistent performance within 1 degree of selected temperature.Amperage Draw : 54 A.Special Features: Energy Efficient
Save Space; EcoSmart tankless electric water heaters are 90% smaller than traditional tank heaters; may be installed on wall or at point of use; Dimensions 11.5 x 8 x 3.75 inches
Save Energy; EcoSmart tankless electric water heaters are 99% thermal energy efficient; Only heats water when called unlike a tank heater that maintains water temperature even when not being used.
EcoSmart ECO 11 Sizing; 13-kilowatt tankless electric water heater ideal for providing hot water for a bathroom, small sink, office breakroom and other point-of-use or low-flow applications; provides between 1.3 and 3.1 gallons-per-minute depending on the inlet water temperature; refer to the sizing guide to select the proper solution

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