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10 Best Electric Tankless Water Heaters 2025 in the United States

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Our technology thoroughly searches through the online shopping world, reviewing hundreds of sites. We then process and analyze this information, updating in real-time to bring you the latest top-rated products. This way, you always get the best and most current options available.

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Our Top Picks

#1

Winner

Stiebel Eltron Tankless Heater – Tempra 36 Plus – Electric, On Demand Hot Water, Eco, White

Rating
9.9
Chosen by1,379
Flow Rate
Temperature Rise
Power Requirements

Most important from
2089 reviews

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.

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.

Rating
9.9
Chosen by1,379
Flow Rate
Temperature Rise
Power Requirements

Most important from
2089 reviews

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.
#2

Stiebel Eltron 239223 Tankless Water Heater – Tempra 29 Plus – Electric, On Demand Hot Water, Eco, White, 23

Rating
9.8
Flow Rate
Temperature Rise
Power Requirements

Most important from
2089 reviews

Flow Rate
Delivers a continuous flow of hot water even when running multiple showers simultaneously, ensuring no interruptions during extended use.
Temperature Rise
Features precise temperature control with two memory presets, allowing easy and perfect filling of tubs or customized temperature settings.
Power Requirements
Requires a substantial electrical setup including multiple dedicated breakers and possibly a service panel upgrade, which adds to initial installation complexity and cost.
Energy Efficiency
Heats water efficiently on demand, using energy only when hot water is needed, which makes it both eco-friendly and cost-effective.
Size and Installation
Operates with impressive quietness and a compact, space-saving design that fits well near living spaces without noise disturbance.

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.

Installation requires a dedicated hard-wired 240-volt electric supply with three separate 40-amp breakers and substantial wiring, as well as a home electrical service of at least 200 amps. This means it might require an electrical upgrade if the home’s system is not already equipped, which could add to initial costs and complexity. The heater’s compact size and wall-mount design save space, and no venting is needed, making it easier to install in various locations.

Energy efficiency is high due to the on-demand heating technology, which only heats water when needed, reducing wasted energy compared to traditional tank heaters. The unit weighs 24 pounds and comes with certifications ensuring safety and quality. This model is ideal for homeowners seeking efficient, space-saving hot water solutions who have the electrical capacity or are willing to upgrade their system. It may be less suitable for very large households needing multiple hot water outlets simultaneously or for those without access to the required electrical setup.

Rating
9.8
Flow Rate
Temperature Rise
Power Requirements

Most important from
2089 reviews

Flow Rate
Delivers a continuous flow of hot water even when running multiple showers simultaneously, ensuring no interruptions during extended use.
Temperature Rise
Features precise temperature control with two memory presets, allowing easy and perfect filling of tubs or customized temperature settings.
Power Requirements
Requires a substantial electrical setup including multiple dedicated breakers and possibly a service panel upgrade, which adds to initial installation complexity and cost.
Energy Efficiency
Heats water efficiently on demand, using energy only when hot water is needed, which makes it both eco-friendly and cost-effective.
Size and Installation
Operates with impressive quietness and a compact, space-saving design that fits well near living spaces without noise disturbance.
#3

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

Rating
9.7
Flow Rate
Temperature Rise
Energy Efficiency

Most important from
2089 reviews

Flow Rate
The ability to provide a continuous flow of hot water, even when running two showers simultaneously, is truly remarkable.
Temperature Rise
The temperature control is precise, ensuring you get the hot water you desire without any fuss.
Energy Efficiency
The heater only uses the hot water necessary, which is eco-friendly and cost-effective.
Size and Installation
The installation took about four hours, and the unit's performance has exceeded expectations in terms of convenience and efficiency.

The Stiebel Eltron Tempra 20 Plus is an electric tankless water heater designed for consistent on-demand hot water. One of its standout features is the Advanced Flow Control technology, which ensures the water temperature remains steady by slightly reducing flow if the demand exceeds the unit's capacity, meaning hot showers are uninterrupted. This heater has a sleek, compact design that saves space and doesn't require venting, making it suitable for whole-house use.

Plus, it's eco-friendly, thanks to its auto-modulation and electronic water flow control, which helps save energy, and the unit even tracks these savings for you. Operating the Tempra 20 Plus is straightforward with a noise-free electronic switch, digital temperature display, and memory buttons for preset temperatures. The unit requires significant electrical power (19.2kW, 240V, and a minimum 125A service) to operate efficiently, so ensure your home can support this. It offers a wide output temperature range of 68° to 140°F.

The installation is wall-mounted, and the heater itself is relatively light at 20.1 pounds. In terms of warranties, it comes with a 7-year leakage warranty and a 3-year parts warranty, indicating confidence in its durability. Some potential users might find its power requirements and installation needs a bit demanding. If you are looking for a reliable, efficient, and eco-friendly tankless water heater for your home, the Tempra 20 Plus is a strong contender. Just ensure your electrical system can meet its requirements.

Rating
9.7
Flow Rate
Temperature Rise
Energy Efficiency

Most important from
2089 reviews

Flow Rate
The ability to provide a continuous flow of hot water, even when running two showers simultaneously, is truly remarkable.
Temperature Rise
The temperature control is precise, ensuring you get the hot water you desire without any fuss.
Energy Efficiency
The heater only uses the hot water necessary, which is eco-friendly and cost-effective.
Size and Installation
The installation took about four hours, and the unit's performance has exceeded expectations in terms of convenience and efficiency.

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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