10 Best Electric Tankless Water Heater of 2025

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

June 2025 Edition

Editor's Choice

9.7

Save 36%

EcoSmart

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

36% OffFree Shipping

Editor's bottom line:

“This 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 189 people today

9.5

Rheem

Rheem 11kW 240V Tankless Electric Water Heater

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Main Highlights

ON/OFF Dial Control with adjustable digital temperature display
Self-modulating power control
11kW Model Flow Rate: up to 2.68 GPM
Side 1/2" NPT water connections
On demand, consistent and continuous hot water

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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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9.2

Save 22%

Stiebel Eltron

Stiebel Eltron 239223 Tankless Water Heater – Tempra 29 Plus – Electric, On Demand Hot Water, Eco, White, 23

22% OffFree Shipping

Main Highlights

On demand a continuous and unlimited supply of hot water
Sleek design saves space and no venting required, It also features two different temperature memory presets, making it easy to adjust for personalized needs.
Requires hard-wired 240 or 208-volt electric service, with a maximum draw of 28,800 watts at 240 volts or 21,600 watts at 208 volts
Requires 3 separate dedicated 40 amp breakers with 8 gauge copper wiring, and a minimum of 200 amp total service to the residence

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9.0

Antuony

Tankless Water Heater Electric with Remote, On Demand Under Sink Hot Water Heater Electric 110V with LED Display - Automatic Control System - Fault Self-Test Function (3000W Pure Black, Pure Black)

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Main Highlights

Instant Thermostatic Water Heater - Tankless electric water heater adopts 3000W-5000W heating system, no preheating required, rapid heating in 3 seconds, providing instant hot water. Instant, continuous, endless hot water It is the perfect companion to your sink, giving you the perfect experience of comfort and relaxation.
Remote Control Water Heater - Instantaneous electric water heater adopts ultra-thin and smooth appearance design, which is beautiful and elegant. The water temperature can be adjusted by remote control and touch, making it more convenient to use. Three-level power adjustment of constant temperature water outlet, say goodbye to hot and cold, the temperature can reach 55/131.
Save Space and Energy - Our tankless water heaters are compact and fit easily under your sink, making them perfect for every corner of your home without taking up space. The thermal efficiency of tankless electric water heaters is as high as 99%, allowing you to enjoy hot water at any time and save energy.
Safety Protection - Our instant electric water heater has been rigorously tested and has multiple protection functions: water and electricity isolation, IPX4 waterproof, leakage protection, dry boil protection, automatic power off under overheating and inactivity. Prevent leakage and water pipe corrosion.
Easy to Install - The domestic tankless water heater adopts a mini design, which is very convenient to install in the bathroom, kitchen and under the sink, etc. where it is needed in the home. Standard 1/2 connection (in or out) for direct connection to conventional household hose connectors. If you still have questions, please feel free to contact us.

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8.8

Rheem

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

Main Highlights

External adjustable digital thermostatic control with LED display (+/1 degree accuracy
Durable Copper immersion two heating elements, field Serviceable.Self-modulating power control
Simple installation 1/2 NPT adapters included; side 1/2 inch Compression water connections
99.8% energy efficient. External controls to adjust temperature in increments of 1°f. Water-Saver Shower Head 1.5 GPM
Threaded for easy replacement, simple installation, digital temperature display 54 A. 13kW Model Flow Rate: up to 3.17 GPM
54 A

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8.6

Save 12%

Rheem

Rheem 18kW 240V Tankless Electric Water Heater, Gray

12% OffFree 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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8.3

Save 34%

EcoSmart

EcoSmart ECO 27 Tankless Water Heater, Electric, 27-kW - Quantity 1, 17 x 17 x 3.5

34% Off

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
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 17 x 17 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. Save up to 50% in water heating costs according to the Department of Energy
EcoSmart ECO 27 Sizing; Refer to the sizing map. Requires 3x40 AMP Double Pole Breaker, 27-kilowatt tankless electric water heater ideal for providing hot water for whole home applications; provides between 2.7 and 6.5 gallons-per-minute depending on the inlet water temperature; refer to the sizing guide to select the proper solution
Warranty and Certifications; Limited Lifetime Warranty on electronics, exchanger and element; UL-499 certified; ETL Listed
Required Breaker Quantity: Three 40 Amp Double Pole
Recommended Electrical Panel: 200 Amps
NEVER run out of hot water with an ECOSMART tankless water heater.
Save up to 12 cubic feet of storage space.
Digital temperature control in 1-degree increments gives users complete control of hot water

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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

Save 10%

Rheem

Rheem RTEX-27 240V 3 Heating Chambers Residential Tankless Water Heater

10% Off

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 three heating elements, field Serviceable
Simple installation bottom 3/4 inch NPT water connections
Threaded for easy replacement, simple installation, digital temperature display

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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

36% OffFree Shipping

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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