10 Best tankless hot water heaters of 2025

Save up to 39% off

Best Choice

1

Clicked 548 times in the last month

Rinnai
NEW Rinnai RXP199iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater, Indoor or Outdoor Water Heater, Up to 11.1 GPM, 199,000 BTU
Main highlights

Versatile Installation Options
Installable indoors or outdoors with Versa Vent and Smart Sense gas system.

Ideal for High-Demand Homes
Supports up to 7 fixtures simultaneously with 11.1 GPM flow rate.

Exceptional Customer Support
Praised for knowledgeable and friendly service, ensuring user satisfaction.
9.8

Exceptional

Our Rating
How do we rank?

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service levels, popularity trends, and more. The rankings reflect our opinion and should be a good starting point for shopping. By purchasing the products we rank, you’ll get the lowest price we found while we may receive a commission at no cost to you, which will help us continue to provide you with value.
Value for Money

2

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

22% Off
Main highlights

Unlimited Hot Water Supply
Provides a continuous and unlimited supply of hot water on demand.

Ideal for Energy Efficiency
Best suited for eco-conscious homes seeking energy-efficient water heating solutions.

Highly Praised Performance
Customers love its consistent hot water delivery and space-saving design.
9.5

Excellent

Our Rating

9.3
Easy installation

9.3
Efficient Energy Use

9.1
Temperature control
3

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

39% Off
Main highlights

Endless Hot Water Efficiency
Provides consistent hot water with energy-efficient self-modulating technology, maintaining temperature within 1 degree.

Compact Space Saver
Ideal for small spaces, can be wall-mounted and fits point-of-use applications.

Energy Savings Praised
Customers appreciate reduced utility bills and efficient performance in small households.
9.4

Excellent

Our Rating

9.1
Efficient Energy Use

8.7
Easy installation

8.4
Temperature control
4

ECOTINYMACH

ECOTINYMACH 110V Tankless Water Heater Electric, 3000W Compact Water Heater Under Sink, Conveniently Convertible Between Fahrenheit and Celsius
9.1

Excellent

Our Rating
5

Rheem
Rheem 18kW 240V Tankless Electric Water Heater, Gray
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.
9.0

Excellent

Our Rating

8.2
Easy installation

8.2
Temperature control

8.2
Efficient Energy Use
See Today’s Deals & Prices
6

Rheem
Rheem 11kW 240V Tankless Electric Water Heater
Main highlights

Digital Temperature Display
ON/OFF Dial Control with adjustable digital temperature display for precise control.

Ideal for Small Spaces
Perfect for small bathrooms and single shower use.

Consistent Hot Water
Praised for providing on-demand, consistent, and continuous hot water.
8.9

Very Good

Our Rating

9.5
Efficient Energy Use

8.2
Temperature control

8.0
worth the money
7

Ranein

Ranein Propane Gas Tankless Water Heater, Indoor Max 3.6 GPM, 80,000 BTU Instant Hot Water Heater
8.8

Very Good

Our Rating
8

BOSCH
BOSCH Electric Mini-Tank Water Heater Tronic 3000 T 4-Gallon (ES4) - Eliminate Time for Hot Water - Shelf, Wall or Floor Mounted
Main highlights

Convenient Hot Water Access
4-gallon mini-tank provides instant hot water, 98% thermal efficiency.

Ideal for Point-of-Use
Perfect for under-sink installation in kitchens or bathrooms.

Efficient Energy Usage
Praised for low energy consumption and effective thermal qualities.
8.6

Very Good

Our Rating

9.1
Easy installation

8.9
Temperature control

8.7
worth the money
9

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.
8.4

Good

Our Rating

9.5
Efficient Energy Use

9.3
Temperature control

8.2
Easy installation
10

Generic
Generic Tankless Water Heater Electric, Instant Hot Water Heater Under Sink, 3000W 110V On Demand Mini Water Heater for RV Kitchen Bathroom, White
Main highlights

Instant Heating Efficiency
With 3000W power, this heater provides hot water instantly, adjustable between 68-122°F.

Space-Saving Design
Ideal for compact spaces like kitchens, bathrooms, RVs, ensuring convenience in limited areas.

Lukewarm Water Performance
Users appreciate its capability for providing lukewarm water, suitable for kitchen use.
8.3

Good

Our Rating

8.0
Easy installation

8.0
Temperature control

10 Best tankless hot water heaters of 2025

1

NEW Rinnai RXP199iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater, Indoor or Outdoor Water Heater, Up to 11.1 GPM, 199,000 BTU

2

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

9.3

9.3

9.1

3

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

9.1

8.7

8.4

4

ECOTINYMACH 110V Tankless Water Heater Electric, 3000W Compact Water Heater Under Sink, Conveniently Convertible Between Fahrenheit and Celsius

5

Rheem 18kW 240V Tankless Electric Water Heater, Gray

8.2

8.2

8.2

6

Rheem 11kW 240V Tankless Electric Water Heater

9.5

8.2

8.0

7

Ranein Propane Gas Tankless Water Heater, Indoor Max 3.6 GPM, 80,000 BTU Instant Hot Water Heater

8

BOSCH Electric Mini-Tank Water Heater Tronic 3000 T 4-Gallon (ES4) - Eliminate Time for Hot Water - Shelf, Wall or Floor Mounted

9.1

8.9

8.7

9

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

9.5

9.3

8.2

10

Generic Tankless Water Heater Electric, Instant Hot Water Heater Under Sink, 3000W 110V On Demand Mini Water Heater for RV Kitchen Bathroom, White

8.0

8.0

Sign up and get exclusive special deals