10 Best Tankless Electric Hot Water Heater of 2026

Last updated on 04/04/2026
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Best Choice
1
9.9
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.
9.9
Exceptional
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Best Value
2
9.9
Exceptional
18kW Tankless Water Heater Electric, ORBEK Instant On Demand Hot Water Heater 240V, Up to 4.17 GPM, Supply for 2-3 Fixtures, within 1℉ Stable Temp, ETL Certified, Indoor Installation
Orbek

18kW Tankless Water Heater Electric, ORBEK Instant On Demand Hot Water Heater 240V, Up to 4.17 GPM, Supply for 2-3 Fixtures, within 1℉ Stable Temp, ETL Certified, Indoor Installation

Why we love it
  • Instant hot water supply available.
  • Energy efficiency reduces electricity costs.
  • Comprehensive safety features included.
Main Highlights
  • Note: Things to know before buying, Our Orbek tankless water heater electric 18kw requires 2 x 240V/40A two-pole breakers, 2 sets of 8 AWG wires and 3/4" NPT water connections.Please ensure that the total current of the household circuit breaker panel is greater than or equal to 150 amps. Otherwise, it may affect the normal operation of the equipment. Especially if other high-power appliances are also being used in the household circuit.
  • Instant Hot Water Supply: Orbek electric tankless water heater 240v can provides up to 4.17 GPM of on demand endless hot water and ensure comfortable hot water for 2-3 points of use simultaneously
  • High Energy Efficiency: This on demand hot water heater electric utilizes water-electricity separation to minimize scale and corrosion. It provides endless hot water in just 3 seconds with an impressive efficiency, potentially reducing electricity costs by up to 60% compared to traditional tank-style heaters
  • Comprehensve Security Protection: The tankless hot water heater is ETL certified and packed with advanced safety features, including leakage protection, over-temperature protection, dry-heating protection and lighting resistance etc. Each product undergoes rigorous testing before leaving the factory to ensure its safety and normal operation
  • Stable Temperature Control: The built-in chip adjusts heating power 20,000 times per second, keeping water temperature stable within 1°F for a comfortable shower experience
  • LED Digital Display: Our tankless electric water heater features a high-definition screen with soft lighting for easy temperature adjustments between 86°F and 140°F. It also displays real-time temperature changes
  • Easy Install: With a compact size of 17"H x 13.0"L x 3.9"W, our electric hot water heater saves over 50% of space compared to traditional tank water heaters, fitting easily into most corners of your home. We have also made structural improvements to the product to make installation easier
  • After-Sale Service: We provide long-term return & exchange services along with professional technical consulting support
9.9
Exceptional
Amazon Logo
3
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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4
9.6
Superb
Save 16%
Wintemp 27kW Tankless Water Heater Electric 240V, On Demand Hot Water, Automatically Maintains Water Temperature, Up to 6.5 GPM, WiFi Control, ETL Eertified, Eco, WM27V Plus
WINTEMP

Wintemp 27kW Tankless Water Heater Electric 240V, On Demand Hot Water, Automatically Maintains Water Temperature, Up to 6.5 GPM, WiFi Control, ETL Eertified, Eco, WM27V Plus

16% Off
Why we love it
  • Endless hot water supply.
  • Smart WiFi control.
  • Compact wall mount design.
Main Highlights
  • Important Note: Before purchasing, please ensure this unit meets your installation requirements. The WM27V model is rated at 27kW (240V) with a maximum current of 113A. It requires 3 × 40 Amp double-pole breakers and 3 sets of 8 AWG wiring for installation, with 3/4" NPT water connections
  • Endless Hot Water: Advanced flow control technology automatically maintains water temperature, ensuring maximum efficiency and consistently comfortable hot water. It delivers up to 6.5 GPM of stable hot water output, and if the hot water demand exceeds capacity, the system will slightly reduce the flow to keep the temperature steady-so your hot shower is never interrupted. No more worrying about running out of hot water. Perfect for 2–4 points of use in the home
  • Energy Saving: This unit uses smart self-modulating technology that automatically adjusts power based on real-time water flow and temperature. When the flow decreases, it reduces energy use—and when no hot water is needed, it goes into true zero-energy standby. The water-electricity separation design helps prevent scale buildup and corrosion, keeping the system highly efficient over the long term with little to no maintenance required
  • Space-Saving: The WM27V features a compact wall-mounted design, measuring 15.9" (H) × 13" (W) × 4.2" (D). It saves over 50% more space compared to traditional tank water heaters and can be easily installed in almost any corner of your home. The upgraded internal layout also makes installation simpler and more user-friendly
  • Smart WiFi Control: Control the water temperature remotely via the app (compatible with Smart Home and Tuya Smart). Temperature can be set between 86°F and 140°F. The app also monitors real-time water flow and tracks water and electricity usage. The water heater is activated with an electronic switch and operates silently. It features a digital temperature display and an internal cast-aluminum heating system that handles all the heating efficiently
  • Safe & Reliable: 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
9.6
Superb
Save 16%
Amazon Logo
5
9.5
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
9.5
Superb
Save 8%
Amazon Logo
6
9.5
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
9.5
Superb
Save 8%
Amazon Logo
7
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
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8
9.2
Superb
Tankless Water Heater, ECOTOUCH 27kW 240V Water Heater Electric Hot Water Heaters, Instant Hot Water with Self-Modulating, Up to 6.5GPM for 2-4 Point of Use, ETL Certified, ECO270S White
ECOTOUCH

Tankless Water Heater, ECOTOUCH 27kW 240V Water Heater Electric Hot Water Heaters, Instant Hot Water with Self-Modulating, Up to 6.5GPM for 2-4 Point of Use, ETL Certified, ECO270S White

Why we love it
  • Instant hot water available immediately.
  • Enhanced safety features ensure reliability.
  • Energy efficient, reducing your bills.
Main Highlights
  • 【IMPORTANT REQUIREMENTS】Please verify it's the right size prior to purchasing: 27kW tankless water heater electric, works off 240V power only (not 120V), and this electric tankless water heater 240V draws high amperage up to 113A, so it must be installed with a Home Circuit Breaker Panel of 200A; it also requires 3 pieces of 40A double pole breaker and 3 sets of 8AWG/2 wires with Grounding. Comes with water pipe fittings: 3/4" NPT and dimensions: 12 1/5" (W) x 17 1/4" (H) x 4" (D). Go for further advice of your electrician if necessary.
  • 【INSTANT ENDLESS HOT WATER】Equipped with 27kW heating system, this water heater electric delivers sufficient & endless hot water of 120℉ or higher in seconds without waiting for preheating, nor temperature fluctuation during use due to a smart chip control that monitors 20,000 times per sec, and never runs out of hot water during long shower. With a flow rate of up to 6.5 gallon per minute, this tankless electric water heater ECO270S handles 2 showers simultaneously or 4 small sink fixtures of small homes or apartments.
  • 【SAFE and DURABLE】This tankless hot water heater electric is equipped with multiple protections, including leakage protection, over-temp protection, high voltage protection and dry-heating protection. Certified by ETL and qualified by UL, every piece of electric water heater ECO270S goes through strict tests before sending out and ensures 100% safety. Inner water and electricity lines are specially designed to run separately so as to avoid leakage risk and scale build up, so minimal maintenance is needed. You can count on its outstanding performance for years to come.
  • 【ENERGY SAVING】Featured with advanced self-modulation system, this electric water heater tankless automatically adjusts exact power input based on temp setting and water flow rate real time, for example, less power will be input by the hot water heater electric when you reduce water flow, thus, you will get stable and comfortable experience without risk of scalding, ensuring top balance between comfort and energy efficiency, its optimal energy efficiency of 99.8% slashing 60% on electric bill compared to a typical huge tank water heater.
  • 【CONVENIENT to USE】The on demand water heater electric is equipped with a user-friendly touch control panel, making temperature setting and control 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 240V tankless water heater any time. Just set your desired temp and let the smart instant hot water heater handle the rest effortlessly.
9.2
Superb
Amazon Logo
9
9.1
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
9.1
Superb
Save 35%
Amazon Logo
10
9.0
Superb
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
9.0
Superb
Save 17%
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Related Deals You Might Like for Tankless Electric Hot Water Heater

📊We scanned 192 products
🔍
We reviewed the most relevant Tankless Electric Hot Water Heater offers across Amazon and leading retailers, covering major brands and models. Our shortlist features trusted names like Westinghouse, Orbek, Rheem, WINTEMP, APUS, ECOTOUCH, EcoSmart, known for dependable quality and smart design.
⭐
To determine today's best Tankless Electric Hot Water Heater, 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
18kW Tankless Water Heater Electric, ORBEK Instant On Demand Hot Water Heater 240V, Up to 4.17 GPM, Supply for 2-3 Fixtures, within 1℉ Stable Temp, ETL Certified, Indoor Installation

The best value for most shoppers is 18kW Tankless Water Heater Electric, ORBEK Instant On Demand Hot Water Heater 240V, Up to 4.17 GPM, Supply for 2-3 Fixtures, within 1℉ Stable Temp, ETL Certified, Indoor Installation by Orbek, 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 Tankless Electric Hot Water Heater 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 Tankless Electric Hot Water Heater ranking is updated regularly to reflect new releases and price changes—check back for the latest picks and deals.