Best High Efficiency Water Heaters Updated May 2025
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Best High Efficiency Water Heaters
2025 Buyer's GuideUpdated May 2025
Advertiser disclosure About our rankings
Sort by:
Best Overall

9.9

1

9.9

GE Appliances 10 Gallon Versatile Plug and Play Electric Water Heater with Adjustable Thermostat, Easily Installs Where You Wan...
Functionality
Ease of installation
Quality
Value for money
Size
Best Overall

9.9

1
GE Appliances 10 Gallon Versatile Plug and Play Electric Water Heater with Adjustable Thermostat, Easily Installs Where You Wan...
Functionality
Ease of installation
Quality
Value for money
Size
Popular

9.8

2

9.8

Ranein 65,000 BTU RV Tankless Water Heater, High Altitude Available, 12V, CSA Certificated, with Thermostatic Chamber, External...
Ease of installation
Functionality
Water supply
Value for money
Water heater
Fit
Popular

9.8

2
Ranein 65,000 BTU RV Tankless Water Heater, High Altitude Available, 12V, CSA Certificated, with Thermostatic Chamber, External...
Ease of installation
Functionality
Water supply
Value for money
Water heater
Fit
Best Value

9.6

3

9.6

Waterdrop AP431 AP430SS Whole House Scale Inhibitor Filter, Heater Softener System, Prevent Scale Build Up On Hot Water Heaters...
Functionality
Ease of installation
Water filter
Scale reduction
Value for money
$8 Coupon
$8 Coupon
Best Value

9.6

3
Waterdrop AP431 AP430SS Whole House Scale Inhibitor Filter, Heater Softener System, Prevent Scale Build Up On Hot Water Heaters...
Functionality
Ease of installation
Water filter
Scale reduction
Value for money
$8 Coupon

9.5

4

9.5

Rheem RTG-70XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water Heater, 7.0 GPM, Gray
Functionality
Water heating

9.5

4
Rheem RTG-70XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water Heater, 7.0 GPM, Gray
Functionality
Water heating

9.4

5

9.4

Rheem RTG-95DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water Heater, 9.5 GPM
Functionality
Water heating capacity
Value for money
Ease of installation
Save 20%
Save 20%

9.4

5
Rheem RTG-95DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water Heater, 9.5 GPM
Functionality
Water heating capacity
Value for money
Ease of installation
Save 20%

9.2

6

9.2

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

9.2

6
Rheem 18kW 240V Tankless Electric Water Heater, Gray
Ease of installation
Value for money
Space saving
Build quality

9.0

7

9.0

Rheem RTGH-95DVELN-3 Super High Efficiency Condensing Indoor Tankless Natural Gas Water Heater, 9.5 GPM with WiFi
Functionality
Water temperature
Ease of installation
Design
Space saving
Value for money
Save 31%
Save 31%

9.0

7
Rheem RTGH-95DVELN-3 Super High Efficiency Condensing Indoor Tankless Natural Gas Water Heater, 9.5 GPM with WiFi
Functionality
Water temperature
Ease of installation
Design
Space saving
Value for money
Save 31%

8.9

8

8.9

Rheem RTG-95XLP-3 High Efficiency Non-Condensing Outdoor Tankless Liquid Propane Water Heater, 9.5 GPM
Functionality
Heat level
Water supply
Save 25%
Save 25%

8.9

8
Rheem RTG-95XLP-3 High Efficiency Non-Condensing Outdoor Tankless Liquid Propane Water Heater, 9.5 GPM
Functionality
Heat level
Water supply
Save 25%

8.5

9

8.5

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

8.5

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
Premium Pick

8.3

10

8.3

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

8.3

10
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

Our Top Choice

Best Overall

9.9

1

9.9

GE Appliances 10 Gallon Versatile Plug and Play Electric Water Heater with Adjustable Thermostat, Easily Installs Where You Wan...
Functionality
Ease of installation
Quality
Value for money
Size
Best Overall

9.9

1
GE Appliances 10 Gallon Versatile Plug and Play Electric Water Heater with Adjustable Thermostat, Easily Installs Where You Wan...
Functionality
Ease of installation
Quality
Value for money
Size
Related Categories
High Capacity Tankless Water HeaterRheem Tankless Water HeaterRinnai Tankless Water HeaterRheem Water HeaterTankless Gas Water HeaterGas Tankless Water Heater
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Related Categories
High Capacity Tankless Water HeaterRheem Tankless Water HeaterRinnai Tankless Water HeaterRheem Water HeaterTankless Gas Water HeaterGas Tankless Water Heater
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