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Electric Instant Hot Water Heater

10 Best Electric Instant Hot Water Heater 2025 in the United States

#1

Winner

9.9 score

Stiebel Eltron Tankless Water Heater – Tempra 20 Plus – Electric, On Demand Hot Water, Eco, White

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Stiebel Eltron Tankless Water Heater – Tempra 20 Plus – Electric, On Demand Hot Water, Eco, White

Stiebel Eltron

9.9 score

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The Stiebel Eltron Tempra 20 Plus is a well-rounded electric tankless water heater designed to provide continuous hot water on demand. One of its standout features is the Advanced Flow Control technology, which ensures a consistent temperature by automatically adjusting the water flow if demand exceeds capacity. This means you can enjoy uninterrupted hot showers, a major plus for households with high hot water usage.

Rating
9.9
Chosen by1,449
Flow Rate
Power Rating
Temperature Rise

Most important from
2071 reviews

Flow Rate
This unit provides a continuous flow of hot water, even when running two showers simultaneously for an extended period.
Power Rating
One limitation is that during a power failure, you won't have access to hot water, which is a trade-off for its energy efficiency.
Temperature Rise
The heater's temperature control is precise, ensuring you get the hot water you desire without any fuss.
Energy Efficiency
It's efficient and eco-friendly, only using the hot water necessary and reducing energy consumption.
Size and Installation
The Stiebel Eltron Tempra 20 Plus is impressively quiet and its space-saving design is a game-changer.
Safety Features
The unit's preset memory buttons make it easy to use and customize for different needs, such as filling a soaking tub.
#2
9.8 score

Stiebel Eltron Tankless Water Heater - Tempra 20 Trend – Electric, On Demand Hot Water, Eco, White

Stiebel Eltron Tankless Water Heater - Tempra 20 Trend – Electric, On Demand Hot Water, Eco, White

Stiebel Eltron

9.8 score

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The Stiebel Eltron Tempra 20 Trend Electric Tankless Water Heater offers continuous, on-demand hot water without any interruptions, making it ideal for households requiring reliable and consistent hot water. With a maximum flow rate of 2.01 gallons per minute and a power rating of 19.2 kW, it performs efficiently in delivering hot water ranging from 68° to 140°F. The unit's compact design (16.63"W x 14.5"H x 4-5/8"D) ensures it saves space, and its sleek white finish fits well into modern home aesthetics. Installation is straightforward, as it requires no venting and can be mounted easily.

Rating
9.8
Flow Rate
Temperature Rise
Energy Efficiency

Most important from
2071 reviews

Flow Rate
Continuous flow of hot water even with two showers running simultaneously.
Temperature Rise
Precise temperature control ensures you get the desired hot water without fuss.
Energy Efficiency
Eco-friendly and cost-effective by using only the necessary hot water.
Size and Installation
The unit is impressively quiet and its space-saving design is a game-changer.
#3
9.7 score

Rheem 18kW 240V Tankless Electric Water Heater, Gray

Rheem 18kW 240V Tankless Electric Water Heater, Gray

Rheem

9.7 score

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The Rheem 18kW 240V Tankless Electric Water Heater offers a solid performance for providing on-demand hot water. One of its standout features is the external digital thermostatic control with an LED display that allows you to precisely adjust the temperature to your liking, with a high accuracy of +/- 1 degree. The unit’s self-modulating technology is highly efficient as it adjusts the power usage to meet the hot water demand, which can help reduce energy consumption.

Rating
9.7
Power Rating
Temperature Rise
Size and Installation

Most important from
1958 reviews

Power Rating
Cheaper than Home Depot and pulls about 8kw upon use.
Temperature Rise
No need to set the temp to 145 unless using multiple hot water devices simultaneously.
Size and Installation
Installed it in a tiny house and it works wonderfully.

Top 10 Best Electric Instant Hot Water Heater 2025 in the United States

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Allied Science

Allied Science Tankless Water Heater Descaling Solution | Highly Effective Descaler Restores Heating Efficiency, Quart, 32 fl oz

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#1

Winner

9.9 score

Slide 1Slide 2Slide 3Slide 4Slide 5

Stiebel Eltron

Stiebel Eltron Tankless Water Heater – Tempra 20 Plus – Electric, On Demand Hot Water, Eco, White

Flow Rate: 3.79 L/min
Power Rating: 19.2kW
Temperature Rise: 68° to 140°F
Energy Efficiency: High
Size and Installation: 16.63"W x 14.5"H, Wall Mount
Safety Features: Prevents overheating, copper heating system

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6% OFF

Chosen by 1449 this week

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Slide 1

Allied Science

Allied Science Tankless Water Heater Descaling Solution | Highly Effective Descaler Restores Heating Efficiency, Quart, 32 fl oz

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#2

9.8 score

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Stiebel Eltron

Stiebel Eltron Tankless Water Heater - Tempra 20 Trend – Electric, On Demand Hot Water, Eco, White

Flow Rate: 2.01 Gallons Per Minute
Power Rating: 19.2 kW
Temperature Rise: 68° to 140°F
Energy Efficiency: Auto-modulation feature
Size and Installation: 16.63"W x 14.5"H x 4-5/8"D
Safety Features: CSA, NSF, UL, ANSI certifications

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#3

9.7 score

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Rheem

Rheem 18kW 240V Tankless Electric Water Heater, Gray

Flow Rate: 4.4 GPM
Power Rating: 18000 watts
Energy Efficiency: self-modulating
Size and Installation: 14.5"W x 18.25"H, 3/4" NPT

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#4

9.5 score

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Rheem

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

Flow Rate: 5.9 GPM
Power Rating: 24 KW
Energy Efficiency: 99.8%
Size and Installation: 17.63"W x 18.25"H, Wall Mount
Safety Features: Digital display, ON/OFF dial control

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#5

9.2 score

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EcoSmart

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

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#6

9.0 score

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Rheem

Rheem 11kW 240V Tankless Electric Water Heater

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9% OFF
#7

8.7 score

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Rheem

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

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#8

8.5 score

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thermomate

thermomate Mini Tank Water Heater Electric, 4 Gallons Small Under Sink Water Heater for Point of Use Instant Hot Water 110V 120V, Wall or Floor Mounted, UL Listed ES400

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#9

8.2 score

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CAMPLUX ENJOY OUTDOOR LIFE

CAMPLUX Mini Tank Electric Water Heater 1.3 Gallons Hot Water Heaters 120V, Under Sink Water Heater with Cord Plug 1.44kW

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11% OFF
#10

7.9 score

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EcoSmart

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

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20% OFF
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Buying Guide for the Best Electric Instant Hot Water Heater

Choosing the right electric instant hot water heater can significantly improve your comfort and energy efficiency at home. These devices provide hot water on demand, eliminating the need for a storage tank and reducing energy waste. To find the best fit for your needs, it's important to understand the key specifications and how they relate to your household's requirements.
Flow RateFlow rate, measured in gallons per minute (GPM), indicates how much hot water the heater can produce at a time. This is crucial because it determines whether the heater can meet your household's hot water demands. For instance, a flow rate of 1-2 GPM is suitable for a single faucet or shower, while 3-5 GPM can handle multiple fixtures simultaneously. To choose the right flow rate, consider the number of hot water outlets you plan to use at the same time.
Power RatingThe power rating, measured in kilowatts (kW), indicates the heater's capacity to heat water. Higher power ratings mean the heater can heat water more quickly and to higher temperatures. For small households or single-point applications, a lower power rating (3-6 kW) may suffice. Larger households or those with higher hot water demands should look for units with higher power ratings (7-12 kW or more). Assess your household's hot water usage to determine the appropriate power rating.
Temperature RiseTemperature rise refers to the increase in water temperature that the heater can achieve, typically measured in degrees Fahrenheit. This is important because it affects how hot the water will be when it reaches your tap. A higher temperature rise is necessary in colder climates where incoming water temperatures are lower. For moderate climates, a temperature rise of 30-40°F may be sufficient, while colder areas might require a rise of 50-60°F or more. Consider your local climate and desired water temperature when evaluating this spec.
Energy EfficiencyEnergy efficiency indicates how effectively the heater converts electrical energy into hot water, often expressed as a percentage. Higher efficiency means lower energy consumption and reduced utility bills. Look for units with efficiency ratings of 90% or higher for the best performance. If you are environmentally conscious or looking to save on energy costs, prioritize models with higher efficiency ratings.
Size and InstallationThe physical size of the heater and its installation requirements are important considerations, especially if you have limited space. Compact models are ideal for small apartments or point-of-use installations, while larger units may be necessary for whole-house applications. Ensure you have adequate space and the necessary electrical infrastructure to support the heater. Evaluate your available space and installation capabilities before making a decision.
Safety FeaturesSafety features such as automatic shut-off, overheat protection, and leak detection are crucial for preventing accidents and ensuring reliable operation. These features can protect your home and family from potential hazards. Look for models that include multiple safety mechanisms to provide peace of mind. Prioritize safety features if you have young children or elderly family members at home.

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