9 Best tankless water heaters of 2025

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Rinnai
NEW Rinnai RX199iN 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
Install indoors or outdoors with Smart Sense gas control.

Ideal for Large Households
Supports up to 7 fixtures simultaneously with 11.1 GPM.

Endless Hot Water
Customers praise its ability to provide continuous hot water.
9.9

Exceptional

Our Rating

8.0
Easy installation

8.0
Temperature control
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Value for Money

2

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

24% Off
Main highlights

Endless Hot Water
Provides continuous hot water on demand, never runs out.

Space-Saving Design
Compact size fits easily in limited spaces, ideal for small homes.

Energy Efficiency
99% thermal efficiency, significantly reduces energy costs.
9.8

Exceptional

Our Rating

8.2
Temperature control

8.0
Efficient Energy Use

8.0
Easy installation
3

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

36% 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.
9.7

Exceptional

Our Rating

9.1
Efficient Energy Use

8.7
Easy installation

8.4
Temperature control
4

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.
9.6

Exceptional

Our Rating

8.2
Easy installation

8.2
Temperature control

8.2
Efficient Energy Use
5

ECOTINYMACH

ECOTINYMACH 110V Tankless Water Heater Electric, 3000W Compact Water Heater Under Sink, Conveniently Convertible Between Fahrenheit and Celsius
9.3

Excellent

Our Rating
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6

Ranein
Ranein Natural Gas Tankless Water Heater, Indoor Max 3.6 GPM, 80,000 BTU Instant Hot Water Heater
Main highlights

On-Demand Hot Water
Enjoy unlimited hot water instantly without preheating wait time.

Multi-Point Use
Ideal for households needing hot water in bathroom, kitchen, bar.

Energy Efficiency Praised
Customers love its energy-saving design with included exhaust pipe.
9.2

Excellent

Our Rating
7

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.
9.1

Excellent

Our Rating

9.5
Efficient Energy Use

8.2
Temperature control

8.0
worth the money
8

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.
9.0

Excellent

Our Rating

8.0
Easy installation

8.0
Temperature control
9

CAMPLUX ENJOY OUTDOOR LIFE
CAMPLUX Tankless Water Heater Outdoor, 1.32 GPM Portable Propane Camping Water Heater, 5L, AY132, White

20% Off
Main highlights

Lightweight Portable Design
Weighing just 10 pounds, this water heater is easy to transport and set up, perfect for camping or outdoor use.

Ideal for Low Pressure Areas
Operates effectively in off-grid and rural areas with water pressure as low as 3.0 PSI, making it perfect for outdoor showers.

Consistent Hot Water Supply
Customers praise its ability to deliver endless hot water efficiently, enhancing outdoor shower experiences.
8.9

Very Good

Our Rating

9.1
Easy installation

8.7
Simple to use

8.4
worth the money

9 Best tankless water heaters of 2025

1

NEW Rinnai RX199iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater, Indoor or Outdoor Water Heater, Up to 11.1 GPM, 199,000 BTU

8.0

8.0

How do we rank?

How do we rank?

Analyzing top stores

2

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

8.2

8.0

8.0

3

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

9.1

8.7

8.4

4

Rheem 18kW 240V Tankless Electric Water Heater, Gray

8.2

8.2

8.2

5

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

6

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

7

Rheem 11kW 240V Tankless Electric Water Heater

9.5

8.2

8.0

8

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

9

CAMPLUX Tankless Water Heater Outdoor, 1.32 GPM Portable Propane Camping Water Heater, 5L, AY132, White

9.1

8.7

8.4

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