Best Tankless Water Heaters Updated May 2025
Advertiser disclosure About our rankings

Join the millions that have trusted BuyersGuide.org to help them make smarter buying decisions. Let our independent expert reviews and data-driven shopping recommendations help you find the one that's right for you.

Best Tankless Water Heaters
2025 Buyer's GuideUpdated May 2025
Advertiser disclosure About our rankings
Sort by:
Best Water Heater

9.9

1

9.9

Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
Ease of installation
Water supply
Value for money
Size
Quality
Picked by 716 people this month!
Picked by 716 people this month!
Picked by 716 people this month!
Best Water Heater

9.9

1
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
Ease of installation
Water supply
Value for money
Size
Quality
Picked by 716 people this month!

9.6

2

9.6

Propane Gas Tankless Water Heater, MIZUDO Up to 3.6 GPM, 80,000 BTU, CSA Certified, Indoor Installation Instant Hot Water Heate...
Functionality
Ease of installation
Value for money
Water capacity
Read Full Review
Save 15% + $40 Coupon
Save 15% + $40 Coupon

9.6

2
Propane Gas Tankless Water Heater, MIZUDO Up to 3.6 GPM, 80,000 BTU, CSA Certified, Indoor Installation Instant Hot Water Heate...
Functionality
Ease of installation
Value for money
Water capacity
Save 15% + $40 Coupon
Read Full Review

9.4

3

9.4

BOSCH Electric Mini-Tank Water Heater Tronic 3000 T 4-Gallon (ES4) - Eliminate Time for Hot Water - Shelf, Wall or Floor Mounte...
Heat level
Works great
Ease of installation
Size
Value for money
Installation
Save 6%
Save 6%

9.4

3
BOSCH Electric Mini-Tank Water Heater Tronic 3000 T 4-Gallon (ES4) - Eliminate Time for Hot Water - Shelf, Wall or Floor Mounte...
Heat level
Works great
Ease of installation
Size
Value for money
Installation
Save 6%
Premium Pick

9.3

4

9.3

NEW Rinnai RX199iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater, Indoor or Outdoor Water Heater, Up to 1...
Ease of installation
Heat capacity
Water temperature
Design
Works great
Energy efficiency
Premium Pick

9.3

4
NEW Rinnai RX199iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater, Indoor or Outdoor Water Heater, Up to 1...
Ease of installation
Heat capacity
Water temperature
Design
Works great
Energy efficiency
Popular

9.1

5

9.1

BOSCH Electric Mini-Tank Water Heater Tronic 3000 T 2.5-Gallon (ES2.5) - Eliminate Time for Hot Water - Shelf, Wall or Floor Mo...
Heat level
Works great
Ease of installation
Size
Value for money
Installation
Save 15%
Save 15%
Popular

9.1

5
BOSCH Electric Mini-Tank Water Heater Tronic 3000 T 2.5-Gallon (ES2.5) - Eliminate Time for Hot Water - Shelf, Wall or Floor Mo...
Heat level
Works great
Ease of installation
Size
Value for money
Installation
Save 15%

8.9

6

8.9

Titan Electric Tankless Water Heater
Functionality
Ease of installation
Value for money
Ease of replacement
Space saving
Energy efficiency

8.9

6
Titan Electric Tankless Water Heater
Functionality
Ease of installation
Value for money
Ease of replacement
Space saving
Energy efficiency

8.6

7

8.6

Rheem 18kW 240V Tankless Electric Water Heater, Gray
Ease of installation
Value for money
Space saving
Build quality

8.6

7
Rheem 18kW 240V Tankless Electric Water Heater, Gray
Ease of installation
Value for money
Space saving
Build quality
Best Value

8.5

8

8.5

CAMPLUX Tankless Water Heater Outdoor, 1.32 GPM Portable Propane Camping Water Heater, 5L, AY132, White
Works great
Water temperature
Ease of setup
Value for money
Shower size
Read Full Review
Best Value

8.5

8
CAMPLUX Tankless Water Heater Outdoor, 1.32 GPM Portable Propane Camping Water Heater, 5L, AY132, White
Works great
Water temperature
Ease of setup
Value for money
Shower size
Read Full Review
Best Gas

8.3

9

8.3

Takagi T-H3-DV-N Condensing High Efficiency Natural Gas Indoor Tankless Water Heater, 10-Gallon Per Minute, 199,000 BTU
Functionality
Heat level
Ease of installation
Energy efficiency
Space saving
Build quality
Best Gas

8.3

9
Takagi T-H3-DV-N Condensing High Efficiency Natural Gas Indoor Tankless Water Heater, 10-Gallon Per Minute, 199,000 BTU
Functionality
Heat level
Ease of installation
Energy efficiency
Space saving
Build quality

8.2

10

8.2

Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY
Works well
Ease of installation
Value for money
Space saving
Shower capacity

8.2

10
Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY
Works well
Ease of installation
Value for money
Space saving
Shower capacity

Our Top Choice

Best Water Heater

9.9

1

9.9

Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
Ease of installation
Water supply
Value for money
Size
Quality
Picked by 716 people this month!
Picked by 716 people this month!
Picked by 716 people this month!
Best Water Heater

9.9

1
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
Ease of installation
Water supply
Value for money
Size
Quality
Picked by 716 people this month!
Related Categories
Tankless Hot Water HeaterHot Water HeaterElectric Tankless Water HeaterHigh Capacity Tankless Water HeaterOn Demand Electric Hot Water HeaterOn-Demand Water Heater
How We Rank
Expert Analysis
Our team of experts highlights useful information so you can easily compare products to find the one that's right for you.

Award-Winning Tech
Our technology analyzes thousands of purchase trends to bring you the top product recommendations.

Why Trust Our Reviews?
1,000,000+ shoppers use Buyer's Guide every week to find the best products and services online.

Learn more about our rankings.

Reliable, Safe & Secure
Helping millions of users make smarter purchases online.
Related Categories
Tankless Hot Water HeaterHot Water HeaterElectric Tankless Water HeaterHigh Capacity Tankless Water HeaterOn Demand Electric Hot Water HeaterOn-Demand Water Heater
Related Categories
Tankless Hot Water HeaterHot Water HeaterElectric Tankless Water HeaterHigh Capacity Tankless Water HeaterOn Demand Electric Hot Water HeaterOn-Demand Water Heater