10 Best whole house electric tankless water heaters of 2025

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Stiebel Eltron
Stiebel Eltron Tankless Water Heater – Tempra 24 Plus – Electric, On Demand Hot Water, Eco, White, 20.2

11% Off
Main highlights

Continuous Flow Technology
Provides constant hot water without interruption, adjusting flow for demand.

Ideal for Whole-House Use
Perfect for homes needing space-saving, eco-friendly water heating.

Praised for Reliability
Customers love its consistent hot water and quiet operation.
9.9

Exceptional

Our Rating

9.3
Easy installation

9.3
Efficient Energy Use

9.1
Temperature control
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Value for Money

2

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
Main highlights

Continuous Hot Water Supply
Enjoy up to 6.3 GPM of stable, instant hot water.

Whole House Compatibility
Ideal for showers, sinks, dishwashers, and washing machines.

User-Friendly Temperature Control
Remote Wi-Fi and rotary button for precise temperature settings.
9.6

Exceptional

Our Rating
3

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
Main highlights

Instant Hot Water Supply
Provides up to 4.8 GPM of endless hot water, ideal for 2-3 simultaneous uses.

Whole House Use
Perfect for households needing consistent hot water at multiple points.

Energy Efficiency
Highly praised for reducing electricity costs by up to 60%.
9.5

Excellent

Our Rating
4

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
Main highlights

Energy Efficient On-Demand Heating
Automatically adjusts energy use for stable, efficient heating.

Perfect for Residential Showers
Ideal for homes needing continuous hot water without preheating.

Highly Praised Safety Features
Equipped with overheat, leakage, and dry-fire protections.
9.3

Excellent

Our Rating
5

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

Compact Design and Efficiency
Small, suitcase-sized unit that saves space and energy.

Ideal for Whole House Use
Perfect for families needing continuous hot water supply.

Highly Praised Continuous Hot Water
Never run out of hot water, even with high demand.
9.1

Excellent

Our Rating

9.5
Efficient Energy Use

9.3
Temperature control

8.2
Easy installation
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6

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

20% Off
Main highlights

Energy Efficiency and Cost Savings
99% thermal efficiency, saves 60% on heating costs, no preheating needed.

Ideal for Whole House Use
Suitable for 2-3 usage points, endless hot water for showers and more.

Highly Praised Performance
Great water pressure and temperature stability, no leaks reported.
9.0

Excellent

Our Rating

9.5
Temperature control

8.9
Efficient Energy Use
7

Rheem
Rheem 18kW 240V Tankless Electric Water Heater, Gray

11% Off
Main highlights

Efficient Water Heating
The Rheem 18kW Tankless Electric Water Heater offers on-demand hot water with advanced self-modulation for energy savings and efficiency.

Ideal for Small Homes
Best suited for small homes or apartments needing instant hot water without the bulk of traditional tanks.

Space-Saving Design
Customers praise its compact size, freeing up space while delivering reliable hot water.
8.9

Very Good

Our Rating

8.2
Easy installation

8.2
Temperature control

8.2
Efficient Energy Use
8

HNK
Tankless Water Heater Electric ，110v 0-3500W Whole House Tankless Hot Water Heater with Led Temperature Display for Indoor or Outdoor Black-5 Years Quality Assurance
Main highlights

Efficient Heating and Durability
This tankless water heater features a 304 stainless steel pipe and aluminum heating body for efficient, durable performance.

Versatile Use and Installation
Ideal for bathrooms, kitchens, offices, and outdoor settings with flexible, multi-angle installation options.

Customer Praise for Instant Heating
Users appreciate the instant hot water and energy-saving features.
8.8

Very Good

Our Rating
9

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
Main highlights

Powerful Heating System
Provides instant and endless hot water with no temperature fluctuation.

Whole House Use
Ideal for showers, faucets, dishwashers, and washing machines.

Exceptional Customer Service
Praised for responsive and helpful customer support.
8.6

Very Good

Our Rating
10

thermomate
Tankless Water Heater Electric 24kW 208~240 Volt, thermomate On Demand Instant Endless Hot Water Heater, Digital Temperature Display for Residential Whole House Shower, 102A GRAY
Main highlights

Instant Hot Water Availability
Provides hot water in 3 seconds with endless supply, eliminating wait times and cold showers.

Whole House Application
Ideal for residential use, providing stable hot water for showers and other household needs.

Energy Efficiency and Cost Savings
Self-modulating technology praised for reducing energy use by up to 60%.
8.3

Good

Our Rating

10 Best whole house electric tankless water heaters of 2025

1

Stiebel Eltron Tankless Water Heater – Tempra 24 Plus – Electric, On Demand Hot Water, Eco, White, 20.2

9.3

9.3

9.1

How do we rank?

How do we rank?

Analyzing top stores

2

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

3

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

4

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

5

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

9.5

9.3

8.2

6

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

9.5

8.9

7

Rheem 18kW 240V Tankless Electric Water Heater, Gray

8.2

8.2

8.2

8

Tankless Water Heater Electric ，110v 0-3500W Whole House Tankless Hot Water Heater with Led Temperature Display for Indoor or Outdoor Black-5 Years Quality Assurance

9

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

10

Tankless Water Heater Electric 24kW 208~240 Volt, thermomate On Demand Instant Endless Hot Water Heater, Digital Temperature Display for Residential Whole House Shower, 102A GRAY

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