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10 Best Electric Tankless Water Heater 2025 in the United States
#1
Winner
Stiebel Eltron 239223 Tankless Water Heater – Tempra 29 Plus – Electric, On Demand Hot Water, Eco, White, 23
The Stiebel Eltron 239223 Tempra 29 Plus is a high-performing electric tankless water heater that provides an on-demand and continuous supply of hot water. It features a sleek, space-saving design and does not require venting, which makes it versatile for various home installations. This model has a maximum flow rate of 3 gallons per minute (GPM), making it suitable for households with moderate hot water needs.
Rating
9.9
Chosen by1,495
Flow Rate
Power Rating
Temperature Rise
Most important from
2071 reviews
#2
Stiebel Eltron Tankless Water Heater – Tempra 24 Plus – Electric, On Demand Hot Water, Eco, White, 20.2
The Stiebel Eltron Tankless Water Heater - Tempra 24 Plus is a solid choice for anyone looking for an electric water heater that offers on-demand hot water. One of its standout features is the continuous flow technology that ensures a consistent water temperature, making it ideal for families who need uninterrupted hot water during showers or other tasks. With its compact design, this unit saves space, and since it doesn’t require venting, installation is generally straightforward, which can be a major plus for homeowners.
Rating
9.8
Flow Rate
Temperature Rise
Size and Installation Requirements
Most important from
2071 reviews
#3
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 space-saving water heating solution. One of its standout features is the impressive flow rate of up to 4.4 gallons per minute (GPM), which makes it suitable for smaller households or apartments where demand for hot water isn't excessively high. Its energy efficiency rating of 99.8% is quite remarkable, meaning you'll likely save on your energy bills compared to traditional tank heaters. The self-modulation technology adjusts the power based on hot water demand, which further optimizes energy use.
Rating
9.6
Power Rating
Temperature Rise
Size and Installation Requirements
Most important from
1958 reviews
Top 10 Best Electric Tankless Water Heater 2025 in the United States
#1
Winner
9.9 score
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 Rating: 28.8 kW
Energy Efficiency: Energy efficient
Size and Installation Requirements: 16.63"W x 14.5"H, 240-volt service
Chosen by 1495 this week
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
Power Rating: 18000 watts
Energy Efficiency: Energy Efficient
Size and Installation Requirements: 16.63"W x 14.5"H, Wall Mount
Rheem 18kW 240V Tankless Electric Water Heater, Gray
Rheem 18kW 240V Tankless Electric Water Heater, Gray
Flow Rate: 4.4 GPM
Power Rating: 18000 watts
Energy Efficiency: 99.8%
Size and Installation Requirements: 14.5"W x 18.25"H, bottom connections
Rheem RRTGH95DVLP3701178 Rheem RTGH Series 9.5 GPM 199,900 BTU 120 Volt Residential Indoor Liquid Propane Tankless Water Heater Stainless Steel
Rheem RRTGH95DVLP3701178 Rheem RTGH Series 9.5 GPM 199,900 BTU 120 Volt Residential Indoor Liquid Propane Tankless Water Heater Stainless Steel
Flow Rate: 0.4 - 9.5 GPM
Power Rating: 199,900 BTU
Temperature Rise: 100 to 140°F
Energy Efficiency: 0.93
Size and Installation Requirements: 17.7"W x 23.7"H, Wall-mounting
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/min
Power Rating: 13KW at 240V
Temperature Rise: within 1 degree
Energy Efficiency: 99%
Size and Installation Requirements: 11.5 x 8 x 3.75 inches
Related Products
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
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 Requirements: 17.63"W x 18.25"H x 3.5"D
Ranein Electric Tankless Water Heater, 18kW 240V on Demand Instant Endless Water Heater with LED Temperature Display for Residential Whole House Shower, Space Saving
Ranein Electric Tankless Water Heater, 18kW 240V on Demand Instant Endless Water Heater with LED Temperature Display for Residential Whole House Shower, Space Saving
Flow Rate: 4.3 Gallons Per Minute
Power Rating: 18 KW
Temperature Rise: 86°F to 131°F
Energy Efficiency: 99%
Size and Installation Requirements: 13.8"W x 18.7"H, Wall Mount
Rheem 11kW 240V Tankless Electric Water Heater
Rheem 11kW 240V Tankless Electric Water Heater
Flow Rate: 2.68 GPM
Power Rating: 11 KW
Energy Efficiency: Energy-efficient
Size and Installation Requirements: 8.25"W x 12.63"H, Wall Mount
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
Power Rating: 13 kW
Energy Efficiency: 99.8%
Size and Installation Requirements: 1"W x 1"H, 1/2 NPT adapters
#10
7.8 score
Ecosmart ECO 24 24 KW at 240-Volt Electric Tankless Water Heater with Patented Self Modulating Technology, 17 x 17 x 3.5
Ecosmart ECO 24 24 KW at 240-Volt Electric Tankless Water Heater with Patented Self Modulating Technology, 17 x 17 x 3.5
Flow Rate: 5.8 Gallons Per Minute
Power Rating: 24 kW at 240 volts
Energy Efficiency: 99.8%
Size and Installation Requirements: 17 x 17 x 3.5 inches, Wall-mount
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Buying Guide for the Best Electric Tankless Water Heater
Choosing the right electric tankless water heater can significantly impact your comfort and energy efficiency at home. These devices heat water on demand, which means you won't run out of hot water and you can save on energy costs since there's no need to keep a large tank of water hot at all times. However, selecting the right model involves understanding several key specifications to ensure it meets your household's needs.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 supply enough hot water for your household's simultaneous needs, such as running a shower and a dishwasher at the same time. For small households or single applications, a lower GPM (around 2-4 GPM) might suffice. Larger households or those with higher simultaneous hot water demands should look for higher GPM ratings (5 GPM and above). Assess your household's peak hot water usage to determine the appropriate flow rate.
Power RatingThe power rating, measured in kilowatts (kW), indicates the heater's capacity to heat water. Higher kW ratings mean the heater can heat water more quickly and to higher temperatures. This is important for ensuring that the water reaches the desired temperature, especially in colder climates where incoming water temperature is lower. For warmer climates or lower hot water demands, a unit with a lower kW rating (around 10-15 kW) may be sufficient. In colder climates or for higher demands, look for units with higher kW ratings (18 kW and above). Consider your climate and hot water needs to choose the right power rating.
Temperature RiseTemperature rise refers to the increase in water temperature that the heater can achieve. This is important because it affects how hot the water will be when it reaches your tap. The required temperature rise depends on the incoming water temperature and the desired output temperature. For example, if your incoming water is 50°F and you want it to be 120°F, you need a temperature rise of 70°F. Units with higher temperature rise capabilities are better suited for colder climates or higher hot water demands. Determine your incoming water temperature and desired output temperature to select a heater with the appropriate temperature rise.
Energy EfficiencyEnergy efficiency, often expressed as a percentage, indicates how effectively the heater converts electrical energy into hot water. Higher efficiency ratings mean less energy waste and lower operating costs. This is important for reducing your energy bills and environmental impact. Most electric tankless water heaters have high efficiency ratings (around 90-99%), but even small differences can add up over time. Look for units with higher efficiency ratings to maximize energy savings. Consider your long-term energy costs and environmental goals when evaluating efficiency.
Size and Installation RequirementsThe physical size of the heater and its installation requirements are important for ensuring it fits in your available space and can be installed properly. This includes considerations like electrical requirements, ventilation, and mounting options. Smaller units are easier to install in tight spaces but may have lower capacities. Larger units require more space and may need professional installation. Assess your available space and installation capabilities to choose a unit that fits your home and can be installed safely and efficiently.