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10 Best Electric Tankless Water Heaters 2025 in the United States
#1
Winner
Stiebel Eltron Tankless Heater – Tempra 36 Plus – Electric, On Demand Hot Water, Eco, White
The Stiebel Eltron Tankless Heater – Tempra 36 Plus is a reliable choice for on-demand hot water. One of its main strengths is the ability to provide continuous and unlimited hot water, making it ideal for households with high hot water needs. Its sleek design is another advantage, as it saves space and requires no venting, making installation easier, especially in compact areas. The unit operates quietly due to its electronic switch activation, which can be a significant benefit for maintaining a peaceful home environment.
Rating
9.9
Chosen by1,312
Flow Rate
Temperature Rise
Power Requirements
Most important from
2107 reviews
#2
Rheem 18kW 240V Tankless Electric Water Heater, Gray
The Rheem 18kW 240V Tankless Electric Water Heater is a solid choice for those looking for an efficient and reliable source of hot water. With a maximum flow rate of up to 4.4 gallons per minute (GPM), it can meet the demands of small to medium households effectively. One of its standout features is the external digital thermostatic control with a precise +/- 1 degree accuracy, allowing users to easily set and maintain their desired water temperature.
Rating
9.8
Temperature Rise
Power Requirements
Size and Installation
Most important from
1991 reviews
#3
Stiebel Eltron 239223 Tankless Water Heater – Tempra 29 Plus – Electric, On Demand Hot Water, Eco, White, 23
The Stiebel Eltron Tempra 29 Plus is a powerful electric tankless water heater designed to deliver a continuous supply of hot water on demand. It offers a maximum flow rate of about 3 gallons per minute, suitable for small to medium households or single-point applications like a shower or sink. Its high wattage (28.8 kW) supports a strong temperature rise, heating cold water efficiently to your desired temperature even in colder climates. The unit includes convenient features like two temperature memory presets and an easy-to-read LED display for simple control.
Rating
9.6
Flow Rate
Temperature Rise
Power Requirements
Most important from
2107 reviews
Top 10 Best Electric Tankless Water Heaters 2025 in the United States
#1
Winner
Stiebel Eltron Tankless Heater – Tempra 36 Plus – Electric, On Demand Hot Water, Eco, White
Stiebel Eltron Tankless Heater – Tempra 36 Plus – Electric, On Demand Hot Water, Eco, White
Flow Rate: 1.5 Gallons Per Minute
Power Requirements: 27 kW, 208 volts
Energy Efficiency: High
Size and Installation: 16.63"W x 14.5"H, Mounting
Warranty and Support: 7 years leakage, 3 years parts
Chosen by 1312 this week
Rheem 18kW 240V Tankless Electric Water Heater, Gray
Rheem 18kW 240V Tankless Electric Water Heater, Gray
Flow Rate: 4.4 Gallons Per Minute
Power Requirements: 18kW 240V
Energy Efficiency: 99.8%
Size and Installation: 14.5"W x 18.25"H, Wall Mount
Stiebel Eltron 239223 Tankless Water Heater – Tempra 29 Plus – Electric, On Demand Hot Water, Eco, White, 23
Stiebel Eltron 239223 Tankless Water Heater – Tempra 29 Plus – Electric, On Demand Hot Water, Eco, White, 23
Flow Rate: 3 Gallons Per Minute
Power Requirements: 240V, 3x40A breakers, 200A service
Energy Efficiency: High Efficiency
Size and Installation: 16.63"W x 14.5"H, Wall-mount
Stiebel Eltron Tankless Water Heater – Tempra 24 Plus – Electric, On Demand Hot Water, Eco, White, 20.2
Stiebel Eltron Tankless Water Heater – Tempra 24 Plus – Electric, On Demand Hot Water, Eco, White, 20.2
Flow Rate: continuous flow
Temperature Rise: consistent temperature
Power Requirements: 150 A
Energy Efficiency: auto-modulation
Size and Installation: 16.63"W x 14.5"H, Wall Mount
Warranty and Support: 7 years leakage, 3 years parts
Stiebel Eltron Tankless Water Heater - Tempra 29 Trend – Electric, On Demand Hot Water, Eco, White
Stiebel Eltron Tankless Water Heater - Tempra 29 Trend – Electric, On Demand Hot Water, Eco, White
Temperature Rise: 68° to 140°F
Power Requirements: 200 A
Energy Efficiency: auto-modulation saves energy
Size and Installation: 16.63"W x 14.5"H
Warranty and Support: 7 years leakage, 3 years parts
Related Products
EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology
EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology
Flow Rate: 1.3 to 3.1 gallons per minute
Temperature Rise: within 1 degree of setting
Power Requirements: 240 volts, 54 amps
Energy Efficiency: 99%
Size and Installation: 11.5 x 8 x 3.75 inches
Warranty and Support: Lifetime warranty on electronics
Stiebel Eltron Tankless Water Heater – Tempra 20 Plus – Electric, On Demand Hot Water, Eco, White
Stiebel Eltron Tankless Water Heater – Tempra 20 Plus – Electric, On Demand Hot Water, Eco, White
Flow Rate: 3.79 L/min
Temperature Rise: 68° to 140°F
Power Requirements: 19.2kW, 240V, 125A
Energy Efficiency: High
Size and Installation: 16.63"W x 14.5"H x 4.63"D
Warranty and Support: 7-year leakage, 3-year parts
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
Flow Rate: 5.9 Gallons Per Minute
Power Requirements: 24kW, 240V
Energy Efficiency: 99.8%
Size and Installation: 17.63"W x 18.25"H, Wall Mount
#10
Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY
Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY
Flow Rate: 3.17 GPM
Temperature Rise: Adjustable digital thermostatic control
Power Requirements: 13 KW
Energy Efficiency: 99.8%
Size and Installation: 1"W x 1"H, 1/2 NPT adapters
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Buying Guide for the Best Electric Tankless Water Heaters
Choosing the right electric tankless water heater can significantly impact your comfort and energy efficiency. These devices heat water on demand, which means you won't run out of hot water and you can save on energy costs. However, selecting the right model involves understanding several key specifications to ensure it meets your household's needs. Here’s a guide to help you navigate through the essential specs and make an informed decision.Flow RateFlow rate, measured in gallons per minute (GPM), indicates how much hot water the unit 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 shower typically requires 1.5-2.5 GPM, while a dishwasher might need 1-2 GPM. If you have a large family or multiple hot water needs simultaneously, look for a higher flow rate (5-7 GPM). For smaller households or single-point applications, a lower flow rate (2-4 GPM) may suffice.
Temperature RiseTemperature rise refers to how much the unit can increase the water temperature as it flows through. This is important because it affects how hot the water will be when it reaches your tap. The required temperature rise depends on your incoming water temperature and your desired output temperature. For example, if your incoming water is 50°F and you want it at 120°F, you need a unit that can handle a 70°F rise. Higher temperature rise capabilities are essential in colder climates or for higher output temperatures.
Power RequirementsElectric tankless water heaters require a certain amount of electrical power to operate, typically measured in kilowatts (kW). This is important because it affects both the installation process and your energy consumption. Higher power units (18-36 kW) can provide more hot water but may require electrical upgrades in your home. Lower power units (3-12 kW) are easier to install and consume less energy but may not meet high-demand needs. Consider your household's hot water usage and your home's electrical capacity when choosing the power rating.
Energy EfficiencyEnergy efficiency, often expressed as a percentage, indicates how well the unit converts electrical energy into hot water. Higher efficiency means lower energy costs and less environmental impact. Most electric tankless water heaters have efficiency ratings between 90-99%. Look for models with higher efficiency ratings if you want to save on energy bills and reduce your carbon footprint. However, even a slightly lower efficiency model can be suitable if it meets your other needs and is more affordable.
Size and InstallationThe physical size of the unit and its installation requirements are also important considerations. Electric tankless water heaters are generally compact, but you need to ensure you have enough space for installation and proper ventilation. Additionally, some units may require professional installation, especially if electrical upgrades are needed. Consider where you plan to install the unit and whether you have the necessary space and access to electrical connections. Smaller units are ideal for tight spaces or single-point applications, while larger units may be better for whole-house use.
Warranty and SupportWarranty and customer support are crucial for long-term satisfaction with your purchase. A good warranty can provide peace of mind and protect you from unexpected repair costs. Look for units with longer warranties (5-10 years) and check what is covered, such as parts and labor. Additionally, consider the manufacturer's reputation for customer support. Reliable support can be invaluable if you encounter any issues or need assistance with installation and maintenance.