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10 bestRheem Tankless Hot Water Heatersof December 2025

112M consumers helped this year.

1

Tankless Water Heater Electric 27kW 208~240 Volt, thermomate On Demand Instant Endless Hot Water Heater, Digital Temperature Display for Residential Whole House Shower, 114A GRAY
Tankless Water Heater Electric 27kW 208~240 Volt, thermomate On Demand Instant Endless Hot Water Heater, Digital Temperature Display for Residential Whole House Shower, 114A GRAY

thermomate

9.8

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17% off

2

Rheem 240V 2 Heating Chambers RTEX-18 Residential Tankless Water Heater, Small Grey
Rheem 240V 2 Heating Chambers RTEX-18 Residential Tankless Water Heater, Small Grey

Rheem

9.6

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20% off

3

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

Rheem

9.5

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4

Rheem RTEX-27 240V 3 Heating Chambers Residential Tankless Water Heater
Rheem RTEX-27 240V 3 Heating Chambers Residential Tankless Water Heater

Rheem

9.3

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5

thermomate Electric Tankless Water Heater, 11kW at 240 Volt, On Demand Instant Hot Water Heater, Self Modulating Energy Saving, Save Space, 2.15GPM at 35°F Rise, Side Connections
thermomate Electric Tankless Water Heater, 11kW at 240 Volt, On Demand Instant Hot Water Heater, Self Modulating Energy Saving, Save Space, 2.15GPM at 35°F Rise, Side Connections

thermomate

9.1

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Related productsUp to 35% off

VEVOR Instant Water Heater, 8kw On Demand Electric Tankless Water Boiler, Digital Temperature Display & Easy Installation & 24-Hour Water Supply, for Kitchen Bathroom Shower Mall Salon ETL Listed

VEVOR Instant Water Heater, 8kw On Demand Electric Tankless Water Boiler, Digital Temperature Display & Easy Installation & 24-Hour Water Supply, for Kitchen Bathroom Shower Mall Salon ETL Listed

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CAMPLUX Tankless Electric Water Heaters 18kW, On Demand Hot Water Heater Electric with Digital Display 240V for Shower, White

CAMPLUX Tankless Electric Water Heaters 18kW, On Demand Hot Water Heater Electric with Digital Display 240V for Shower, White

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Tankless Water Heater, GASLAND Outdoors BE158B 1.58GPM 6L Portable Gas Water Heater, Instant Propane Water Heater, Overheating Protection, Easy to Install, Use for RV Cabin Barn Camping Boat, Black

Tankless Water Heater, GASLAND Outdoors BE158B 1.58GPM 6L Portable Gas Water Heater, Instant Propane Water Heater, Overheating Protection, Easy to Install, Use for RV Cabin Barn Camping Boat, Black

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Kelaro Tankless Water Heater Flushing Kit - Just add Vinegar

Kelaro Tankless Water Heater Flushing Kit - Just add Vinegar

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6

Thermomate Mini Tank Electric Water Heater ES150 1.3 Gallons Point of Use Water Heater for Instant Hot Water Under Kitchen Sink 120V 1440W
Thermomate Mini Tank Electric Water Heater ES150 1.3 Gallons Point of Use Water Heater for Instant Hot Water Under Kitchen Sink 120V 1440W

thermomate

8.9

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7

Rheem 8kW 240V Tankless Electric Water Heater
Rheem 8kW 240V Tankless Electric Water Heater

Rheem

8.6

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5% off

8

FOGATTI Natural Gas Tankless Water Heater, Indoor 4.0 GPM, 90,000 BTU Instant Hot Water Heater, Instagas Classic 90 Series
FOGATTI Natural Gas Tankless Water Heater, Indoor 4.0 GPM, 90,000 BTU Instant Hot Water Heater, Instagas Classic 90 Series

FOGATTI

8.4

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9

Mizudo Natural Gas Tankless Water Heater 3.6 GPM, 80,000 BTU Indoor Installation Instant Hot Water Heater
Mizudo Natural Gas Tankless Water Heater 3.6 GPM, 80,000 BTU Indoor Installation Instant Hot Water Heater

MIZUDO

8.2

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10

Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, Gray
Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, Gray

Rheem

7.9

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