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10 Best Electric Tankless Water Heaters 2025 in the United States

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Our Top Picks

#1

Winner

Stiebel Eltron Tankless Water Heater – Tempra 24 Plus – Electric, On Demand Hot Water, Eco, White, 20.2

The Stiebel Eltron Tempra 24 Plus is a solid choice for those seeking a reliable electric tankless water heater. One of its standout features is the continuous flow technology, which ensures that you won't run out of hot water during a shower. This system intelligently adjusts water flow to maintain a consistent temperature, making it great for households with higher hot water demands. Its sleek, compact design is also a plus, saving you space while providing on-demand hot water without the need for venting.

Energy efficiency is another strong aspect, as this unit utilizes auto-modulation to conserve energy, which can lead to lower utility bills. The digital temperature display and preset settings offer easy control, making it user-friendly, even for those who aren’t technically inclined. Plus, the generous warranty—7 years for leakage and 3 years for parts—adds peace of mind regarding its reliability.

There are some considerations to keep in mind. The Tempra 24 Plus requires a substantial electrical service of 150 A, which may necessitate upgrades in some homes, potentially adding to installation costs. Additionally, while it can provide ample hot water for most situations, it may struggle with simultaneous high-demand usage, as it reduces flow when demand exceeds capacity. This could be a drawback in larger families or homes where multiple showers and appliances may be in use at the same time.

Customer Highlights

A summary of real customer reviews to highlight what shoppers are saying!
Flow Rate
It provides a continuous flow of hot water, even when running two showers simultaneously.
Temperature Rise
Accurate temperature control ensures you get the hot water you desire without any fuss.
Power Requirements
Absolutely no power usage when not in use, providing instant hot water upon return.
Energy Efficiency
The unit's performance has exceeded expectations in terms of convenience and efficiency.
Size and Installation
Impressively quiet and its space-saving design is a game-changer.
#2

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.

With a power requirement of 27 kW and 208 volts, ensure your home’s electrical system can support this heater, as it demands substantial power. This model also includes a LED display for easy monitoring and control, adding to user convenience. The copper-sheathed heating element housed in a copper cylinder ensures durable performance. The maximum flow rate is 1.5 gallons per minute, which might be limiting for larger households or simultaneous usage in multiple locations. However, the energy efficiency of this model is high, potentially saving on energy costs over time.

The warranty is another strong point, offering 7 years on leakage and 3 years on parts, which reflects confidence in the product's durability. Weighing 19 pounds and with dimensions of 16.63 inches wide by 14.5 inches high, it’s relatively easy to handle and install. This unit is best suited for small to medium-sized households or specific areas needing hot water on demand.

Customer Highlights

A summary of real customer reviews to highlight what shoppers are saying!
Flow Rate
Continuous flow of hot water even with simultaneous usage, such as running two showers at once.
Temperature Rise
Precise temperature control ensures desired hot water without any fuss.
Power Requirements
No power usage when not in use, providing instant hot water even after long periods away.
Energy Efficiency
Eco-friendly and cost-effective as it only uses necessary hot water.
Size and Installation
The installation process was smooth and took about four hours, including adding a whole-home water filtration system.
#3

Stiebel Eltron Tankless Water Heater - Tempra 29 Trend – Electric, On Demand Hot Water, Eco, White

The Stiebel Eltron Tempra 29 Trend electric tankless water heater is designed for continuous, on-demand hot water, ensuring that you never run out of hot showers. Its main strengths lie in its compact and sleek design, which saves space and requires no venting, making it ideal for various installation settings. The unit is also eco-friendly, featuring auto-modulation to save energy and reducing waste when hot water is not needed. Additionally, its silent operation and easy-to-read digital temperature display add to its user-friendly experience.

The solid copper heating system ensures durability and efficient heating performance, capable of providing water temperatures ranging from 68° to 140°F. However, the unit does require a significant electrical setup, with a minimum recommended electric service of 200 A, which may not be suitable for all homes without electrical upgrades. Another consideration is the power consumption, as the 28.8 kW rating could lead to higher energy bills if usage is not monitored.

On the plus side, the product comes with reliable warranties – 7 years for leakage and 3 years for parts, providing peace of mind. This model is best suited for households that can accommodate its power requirements and are looking for an efficient, space-saving solution for continuous hot water supply.

Customer Highlights

A summary of real customer reviews to highlight what shoppers are saying!
Flow Rate
Provides a continuous flow of hot water, even when running two showers simultaneously.
Temperature Rise
Precise temperature control ensures the desired hot water without any fuss.
Power Requirements
No power usage when not in use, ideal for energy savings.
Energy Efficiency
The unit's performance has exceeded expectations in terms of convenience and efficiency.
Size and Installation
Impressively quiet and space-saving, making it a game-changer.
Warranty and Support
Reliable and top-notch quality, even recommended by licensed plumbers.

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.

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