Best Rheem Tankless Water Heaters Updated May 2025
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Best Rheem Tankless Water Heaters
2025 Buyer's GuideUpdated May 2025
Advertiser disclosure About our rankings
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Best Overall

9.9

1

9.9

Rheem 18kW 240V Tankless Electric Water Heater, Gray
Ease of installation
Value for money
Space saving
Build quality
Picked by 140 people this week!
Picked by 140 people this week!
Picked by 140 people this week!
Best Overall

9.9

1
Rheem 18kW 240V Tankless Electric Water Heater, Gray
Ease of installation
Value for money
Space saving
Build quality
Picked by 140 people this week!
Best Value

9.8

2

9.8

Rheem 11kW 240V Tankless Electric Water Heater
Heat level
Functionality
Ease of installation
Size
Longevity
Energy efficiency
Save 9%
Save 9%
Best Value

9.8

2
Rheem 11kW 240V Tankless Electric Water Heater
Heat level
Functionality
Ease of installation
Size
Longevity
Energy efficiency
Save 9%

9.6

3

9.6

Ranein Electric Tankless Water Heater, 18kW 240V on Demand Instant Endless Water Heater with LED Temperature Display for Reside...
Water temperature
Functionality
Ease of installation
Quality
Space saving
Value for money
Save 11%
Save 11%

9.6

3
Ranein Electric Tankless Water Heater, 18kW 240V on Demand Instant Endless Water Heater with LED Temperature Display for Reside...
Water temperature
Functionality
Ease of installation
Quality
Space saving
Value for money
Save 11%

9.5

4

9.5

Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
Ease of installation
Water supply
Value for money
Size
Quality

9.5

4
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
Ease of installation
Water supply
Value for money
Size
Quality

9.3

5

9.3

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

9.3

5
Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY
Works well
Ease of installation
Value for money
Space saving
Shower capacity
Premium Pick

9.1

6

9.1

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

9.1

6
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

9.0

7

9.0

Stiebel Eltron Tankless Water Heater – Tempra 24 Plus – Electric, On Demand Hot Water, Eco, White, 20.2
Functionality
Water temperature
Ease of installation
Build quality
Water heater
Space saving
Read Full Review
Save 17%
Save 17%
Popular

9.0

7
Stiebel Eltron Tankless Water Heater – Tempra 24 Plus – Electric, On Demand Hot Water, Eco, White, 20.2
Functionality
Water temperature
Ease of installation
Build quality
Water heater
Space saving
Save 17%
Read Full Review

8.9

8

8.9

Rheem RTGH-95DVLN-3 RTGH Series 9.5 GPM 199,900 BTU 120 Volt Residential Indoor Natural Gas Tankless Water Heater Stainless Ste...
Functionality
Water temperature
Ease of installation
Design
Space saving
Value for money

8.9

8
Rheem RTGH-95DVLN-3 RTGH Series 9.5 GPM 199,900 BTU 120 Volt Residential Indoor Natural Gas Tankless Water Heater Stainless Ste...
Functionality
Water temperature
Ease of installation
Design
Space saving
Value for money

8.8

9

8.8

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%

8.8

9
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%

8.6

10

8.6

Rheem RTG-70XLP-3 High Efficiency Non-Condensing Outdoor Tankless Liquid Propane Water Heater, 7.0 GPM
Functionality
Heat level
Water supply

8.6

10
Rheem RTG-70XLP-3 High Efficiency Non-Condensing Outdoor Tankless Liquid Propane Water Heater, 7.0 GPM
Functionality
Heat level
Water supply

Our Top Choice

Best Overall

9.9

1

9.9

Rheem 18kW 240V Tankless Electric Water Heater, Gray
Ease of installation
Value for money
Space saving
Build quality
Picked by 140 people this week!
Picked by 140 people this week!
Picked by 140 people this week!
Best Overall

9.9

1
Rheem 18kW 240V Tankless Electric Water Heater, Gray
Ease of installation
Value for money
Space saving
Build quality
Picked by 140 people this week!
Related Categories
Rheem Water HeaterHigh Capacity Tankless Water HeaterHigh Efficiency Water HeaterTankless Gas Water HeaterRinnai Tankless Water HeaterRheem Hot Water Heater
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Related Categories
Rheem Water HeaterHigh Capacity Tankless Water HeaterHigh Efficiency Water HeaterTankless Gas Water HeaterRinnai Tankless Water HeaterRheem Hot Water Heater
Related Categories
Rheem Water HeaterHigh Capacity Tankless Water HeaterHigh Efficiency Water HeaterTankless Gas Water HeaterRinnai Tankless Water HeaterRheem Hot Water Heater