10 Best Electric Tankless Water Heaters of 2026

Last updated on 04/04/2026
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Best Choice
1
9.8
Exceptional
Westinghouse 14kW 240V Smart WiFi Tankless Water Heater Electric, Compatible with Alexa & Google Home, ETL Certified, IPX4, Gray - Upgrade (APOLO-2.0)
Westinghouse

Westinghouse 14kW 240V Smart WiFi Tankless Water Heater Electric, Compatible with Alexa & Google Home, ETL Certified, IPX4, Gray - Upgrade (APOLO-2.0)

Why we love it
  • Instant hot water on demand.
  • Smart Wi-Fi voice control features.
  • Compact design saves valuable space.
Main Highlights
  • 【IMPORTANT NOTES】up to 3.38 GPM for APOLO-14kW. Activation flow: 0.5 GPM. Amperage (amps): 59A. The product works and is compatible with 1 X 60 AMP (DP) breakers and 1 X 6 AWG wire. Bottom 1/2" NPT water connections
  • 【INSTANT HOT WATER 】 Westinghouse 14kW electric tankless water heater delivers continuous hot water on demand — perfect for simultaneous use at 1 shower + 1 sink. Eliminate waiting time and temperature fluctuations during showers, dishwashing, or handwashing.
  • 【SMART WI-FI VOICE CONTROL】 Control water temperature remotely via the app or voice commands (Alexa & Google Home compatible). Adjust settings from 86°F to 140°F in 1° increments. The LED display shows real-time status for easy monitoring.
  • 【ETL SAFETY CERTIFIED & DURABLE DESIGN】 ETL certified with 4-layer protection (leakage, overheat, dry-fire, high voltage). Features separate water-electricity pathways to prevent corrosion and scaling, ensuring low maintenance and extended lifespan.
  • 【SPACE-SAVING & EASY INSTALLATION】 Compact design (14.2" H x 9.5" W x 3.5" D) mounts flush to walls, freeing floor space. Includes 1/2" NPT connections and 60A breaker compatibility.
  • 【PERFECT FOR APARTMENTS & HOMES】 This 14kW, 240V electric tankless water heater efficiently delivers up to 3.38 GPM flow, providing consistent hot water for 1 to 3 points of use simultaneously in apartments, homes, or offices.
9.8
Exceptional
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Best Value
2
9.7
Exceptional
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
Rheem

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

Why we love it
  • Precise temperature control available.
  • Efficient self-modulating power function.
  • Consistent hot water supply guaranteed.
Main Highlights
  • ELECTRICAL REQUIREMENTS: 3 x 40 AMP Double Pole Breakers Required. 200 AMP Household service recommended. Ensure your home can accomodate the power supply and that enough space is available in your breaker panel for this unit. RTEX-24 model is 100A, 24kw, 240V.
  • PROVEN PERFORMANCE: Continuous hot water when you need it for the whole home (review performance guide image to confirm this water heater will provide the hot water needed based on geographic location). Ground water temperature impacts temperature rise and gallons per minute.
  • EASILY ADJUSTABLE: ON/OFF Dial Control with adjustable digital temperature display allows for adjustments in 1-degree increments from 80-140 degrees F.
  • EFFICIENT: Tankless electric water heaters save space, energy, money, and require no venting.
9.7
Exceptional
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3
9.6
Superb
Save 8%
Rheem 18kW 240V Tankless Electric Water Heater, Gray
Rheem

Rheem 18kW 240V Tankless Electric Water Heater, Gray

8% Off
Why we love it
  • Precise digital temperature control.
  • Energy-efficient self-modulation feature.
  • User-friendly installation process.
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
9.6
Superb
Save 8%
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4
9.6
Superb
Save 13%
Stiebel Eltron Tankless Water Heater – Tempra 29 Plus – Electric, 28.8kW, On Demand Hot Water, Eco, White, Made in Germany
Stiebel Eltron

Stiebel Eltron Tankless Water Heater – Tempra 29 Plus – Electric, 28.8kW, On Demand Hot Water, Eco, White, Made in Germany

13% Off
Why we love it
  • Unlimited hot water availability.
  • Sleek, space-saving design.
  • Easy temperature adjustments.
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
9.6
Superb
Save 13%
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5
9.4
Superb
Save 26%
27kW Tankless Water Heater Electric, APUS 240V On Demand Instant Hot Water with Memory Function & LED Display, Energy-Saving Whole Home Water Heating System, Up to 6.5 GPM and Space Saving Design
APUS

27kW Tankless Water Heater Electric, APUS 240V On Demand Instant Hot Water with Memory Function & LED Display, Energy-Saving Whole Home Water Heating System, Up to 6.5 GPM and Space Saving Design

26% OffLimited time deal
Why we love it
  • Endless hot water on demand.
  • Smart temperature control features.
  • Compact and space-saving design.
Main Highlights
  • Endless Instant Hot Water On Demand: Experience continuous electric tankless water heater performance with our powerful 27kW tankless water heater, delivering on-demand hot water at up to 6.5 GPM—ideal for 3-4 simultaneous uses (showers, sinks, appliances). The advanced cast aluminum heating element ensures rapid, efficient heating in this tankless hot water heater electric, with no preheating, no waiting, and no cold interruptions.
  • Smart Control with Memory Function: Precisely set your temperature (86°F-140°F) via the LED display on this electric tankless water heater 240V, with 1°F adjustments for ultimate comfort. The memory function saves settings after power cycles, while self-modulating tech adjusts energy use for efficiency—perfect for smart tankless water heater operation.
  • Compact & Space-Saving Design: This sleek electric water heater (17.72" x 11.42" x 3.54") fits tight spaces, saving 90% more room than tank models. With 3/4" NPT connections and 240V compatibility, installation is effortless (requires 3×40 A breakers,6×8 AWG cable)—ideal for whole-house or point-of-use setups.
  • Energy Efficient & Cost Effective: Our electric tankless water heater achieves 99.8% thermal efficiency, cutting 60% energy costs by only heating water when needed. Zero standby loss and anti-scale cast aluminum maximize savings—eco-friendly and budget-friendly.
  • Reliable Safety Protection: This tankless water heater electric features water-electricity separation and multi-layer safeguards (overheat, dry-fire, leakage protection) for worry-free use. Corrosion-resistant cast aluminum ensures durability, backed by rigorous testing.
9.4
Superb
Save 26%
Limited time deal
Amazon Logo
6
9.2
Superb
Save 35%
EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology , 17 x 14 x 3.5, White
EcoSmart

EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology , 17 x 14 x 3.5, White

35% Off
Why we love it
  • Efficient 18 kW power output.
  • Digital temperature control feature.
  • Versatile for 50/60 Hz systems.
Main Highlights
  • Configured for climates where incoming water temperature is 62 degrees F and above.
  • Capable of heating over 2.5 gpm.
  • Digital temperature control allows temperature settings in 1 degree increments.
  • Voltage: 240
  • Single phase
9.2
Superb
Save 35%
Amazon Logo
7
9.2
Superb
Save 8%
Electric Tankless Water Heater WINTEMP 27kW 240V, Whole House Hot Water Supply, On Demand Instant Endless Water Heater, with LED Temperature Display, WiFi Control, Up to 6.3 GPM, ETL Certified
WINTEMP

Electric Tankless Water Heater WINTEMP 27kW 240V, Whole House Hot Water Supply, On Demand Instant Endless Water Heater, with LED Temperature Display, WiFi Control, Up to 6.3 GPM, ETL Certified

8% Off
Why we love it
  • Stable temperature for comfortable showers.
  • Energy-efficient for reduced bills.
  • Compact design saves valuable space.
Main Highlights
  • Important Note: Ensure this tankless water heater meets your installation requirements. The WN27 model is rated at 27KW (240V) with a maximum amperage of 113A. It requires 3 x 40 Amp double-pole (DP) breakers and 3 x 8/2 AWG wiring with ground, with a recommended 250A household power supply. The unit dimensions are 11.1” (W) x 19.1 ” (H) x 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. Its maximum hot water output is 6.5 gallons per minute. It is perfect for residential shower use, eliminating the need to wait for preheating. There’s no longer any concern about running out of hot water in the tank, and you won’t experience temperature fluctuations during your shower
  • Energy Saving: The 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. Compared with traditional tank water heaters, it is more energy-efficient and space-saving, making it suitable for 2–4 usage points in the home
  • Space Saving: The 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 Usage: Safety is always WINTEMP’s top priority. The product features multiple safety protections, including leakage protection, overheat protection, and dry-fire protection, and is ETL certified to fully ensure your safety, allowing you to enjoy hot water anytime, anywhere with peace of mind. We also provide a 2-year return and exchange warranty along with long-term professional technical support to give you worry-free use
9.2
Superb
Save 8%
Amazon Logo
8
9.1
Superb
Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY
Rheem

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

Why we love it
  • Precise temperature control available.
  • Efficient energy usage guaranteed.
  • Simple installation and maintenance.
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
9.1
Superb
Amazon Logo
9
9.0
Superb
Save 5%
Rheem 11kW 240V Tankless Electric Water Heater
Rheem

Rheem 11kW 240V Tankless Electric Water Heater

5% Off
Why we love it
  • Precise temperature control available.
  • Energy-efficient self-modulating technology.
  • Instantaneous hot water on demand.
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
9.0
Superb
Save 5%
Amazon Logo
10
8.8
Excellent
Save 17%
EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology
EcoSmart

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

17% Off
Why we love it
  • Endless hot water on-demand.
  • Space-saving, compact design.
  • Highly energy efficient heating.
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
8.8
Excellent
Save 17%
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Related Deals You Might Like for Electric Tankless Water Heaters

📊We scanned 192 products
🔍
We reviewed the most relevant Electric Tankless Water Heaters offers across Amazon and leading retailers, covering major brands and models. Our shortlist features trusted names like Westinghouse, Rheem, Stiebel Eltron, APUS, EcoSmart, WINTEMP, known for dependable quality and smart design.
⭐
To determine today's best Electric Tankless Water Heaters, we analyzed 961 real customer and expert reviews, focusing on satisfaction, real-world performance and long-term reliability. We also weigh each review's relevance, authenticity and freshness for a fair comparison.

Here's what we found:

🏆 #1
Westinghouse 14kW 240V Smart WiFi Tankless Water Heater Electric, Compatible with Alexa & Google Home, ETL Certified, IPX4, Gray - Upgrade (APOLO-2.0)

Our overall winner is Westinghouse 14kW 240V Smart WiFi Tankless Water Heater Electric, Compatible with Alexa & Google Home, ETL Certified, IPX4, Gray - Upgrade (APOLO-2.0) by Westinghouse. It stands out for the right balance of quality, performance and value.

✨ What sets it apart:
✓Instant hot water on demand.
✓Smart Wi-Fi voice control features.
✓Compact design saves valuable space.
💎 Best Value
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray

The best value for most shoppers is Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray by Rheem, with consistently high satisfaction across expert and customer reviews.

💰 Best Deal
EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology , 17 x 14 x 3.5, White

The strongest deal right now for Electric Tankless Water Heaters is EcoSmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology , 17 x 14 x 3.5, White at EcoSmart, currently at 35% off.

🔄Our Electric Tankless Water Heaters ranking is updated regularly to reflect new releases and price changes—check back for the latest picks and deals.