10 Best Tankless Electric Water Heater of 2026

Last updated on 04/19/2026
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Best Choice
1
9.8
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.
9.8
Exceptional
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Best Value
2
9.6
Superb
EcoSmart ECO 27 Tankless Water Heater, Electric, 27-kW - Quantity 1, 17 x 17 x 3.5
EcoSmart

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

Why we love it
  • Efficient temperature control technology.
  • Powerful 27 kW performance.
  • Versatile 50/60 Hz compatibility.
Main Highlights
  • Configured for climates where incoming water temperature can reach as low as 37 degrees.
  • Capable of heating nearly 3 gpm.
  • Digital temperature control allows temperature settings in 1 degree increments.
  • Voltage - 240
  • Single phase
9.6
Superb
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3
9.5
Superb
Rheem 18kW 240V Tankless Electric Water Heater, Gray
Rheem

Rheem 18kW 240V Tankless Electric Water Heater, Gray

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
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4
9.3
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
9.3
Superb
Save 13%
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5
9.2
Superb
Save 13%
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,Gray
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,Gray

13% Off
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.
9.2
Superb
Save 13%
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6
9.0
Superb
Save 25%
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

25% 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
9.0
Superb
Save 25%
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7
8.9
Excellent
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
8.9
Excellent
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8
8.7
Excellent
Save 25%
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

25% 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
8.7
Excellent
Save 25%
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9
8.7
Excellent
Save 6%
Rheem 11kW 240V Tankless Electric Water Heater
Rheem

Rheem 11kW 240V Tankless Electric Water Heater

6% 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
8.7
Excellent
Save 6%
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10
8.7
Excellent
Save 13%
14kW Tankless Water Heater Electric, ORBEK On Demand Instant Hot Water Heater 240V, Max 3.38 GPM, Supply for 2-3 Fixtures, ETL Certified, Indoor Installation, New Upgraded 2.0
Orbek

14kW Tankless Water Heater Electric, ORBEK On Demand Instant Hot Water Heater 240V, Max 3.38 GPM, Supply for 2-3 Fixtures, ETL Certified, Indoor Installation, New Upgraded 2.0

13% OffLimited time deal
Why we love it
  • Instant hot water on demand.
  • Energy savings and efficiency.
  • Compact space-saving installation.
Main Highlights
  • Note: Please ensure the household circuit breaker panel has a total current capacity of at least 150 amps. Our Orbek tankless water heater electric 14kw requires a 240V/60AMP two-pole breaker, 1 set of 6 AWG wires and 1/2" NPT water connections.
  • Instant Hot Water Supply: Orbek electric tankless water heater 240v can provides max 3.38 GPM of on demand endless hot water and ensure comfortable hot water for 2-3 points of use
  • Experience High Efficiency & Cost Savings: Our on demand hot water heater electric delivers endless hot water in just 3 seconds and uses up to 60% less electricity than traditional tank heaters. Its advanced water-electricity separation technology minimizes scale and corrosion, ensuring lasting performance. Save energy and enjoy reliable, instant hot water.
  • Certified Safety & Advanced Protection: This tankless hot water heater is ETL certified and engineered for your peace of mind. It features comprehensive safety systems including leakage, over-temperature, and dry-heating protection, along with lightning resistance. Every unit undergoes rigorous factory testing to ensure safe, reliable, and normal operation in your home.
  • 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
  • Intuitive LED Display for Precise Control: Our tankless electric water heater features a high-definition digital screen with soft backlighting. Easily set your preferred temperature between 86°F and 140°F and monitor real-time temperature changes at a glance for effortless and precise hot water management.
  • Space-Saving & Easy Installation: This electric hot water heater features a compact design (14.2"H x 9.5"L x 3.1"W), saving over 50% of space compared to traditional tank heaters to fit easily in tight corners. Its structurally optimized build makes setup straightforward and hassle-free.
  • After-Sale Service: We provide long-term return & exchange services along with professional technical consulting support
8.7
Excellent
Save 13%
Limited time deal
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Related Deals You Might Like for Tankless Electric Water Heater

📊We scanned 351 products
🔍
We reviewed the most relevant Tankless Electric Water Heater offers across Amazon and leading retailers, covering major brands and models. Our shortlist features trusted names like Rheem, EcoSmart, Stiebel Eltron, APUS, Orbek, known for dependable quality and smart design.
⭐
To determine today's best Tankless Electric Water Heater, we analyzed 1756 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
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray

Our overall winner is Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray by Rheem. It stands out for the right balance of quality, performance and value.

✨ What sets it apart:
✓Precise temperature control available.
✓Efficient self-modulating power function.
✓Consistent hot water supply guaranteed
💎 Best Value
EcoSmart ECO 27 Tankless Water Heater, Electric, 27-kW - Quantity 1, 17 x 17 x 3.5

The best value for most shoppers is EcoSmart ECO 27 Tankless Water Heater, Electric, 27-kW - Quantity 1, 17 x 17 x 3.5 by EcoSmart, with consistently high satisfaction across expert and customer reviews.

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

The strongest deal right now for Tankless Electric Water Heater is EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology at EcoSmart, currently at 25% off.

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