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10 Best Residential Tankless Electric Hot Water Heaters 2025 in the United States

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Our Top Picks

#1

Winner

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

Rating
9.9
Chosen by1,253
Flow Rate (GPM)
Temperature Rise
Installation Requirements

Most important from
2086 reviews

Flow Rate (GPM)
Provides a continuous flow of hot water, even when running multiple showers simultaneously.
Temperature Rise
Precise temperature control ensures you get the hot water you desire without any fuss.
Installation Requirements
Installation is straightforward, but professional installation is recommended for peace of mind.

The Stiebel Eltron Tempra 29 Trend Tankless Water Heater is an excellent choice for residential use, particularly for those looking for an efficient and space-saving solution. With a maximum flow rate of 9.5 gallons per minute, it can comfortably provide endless hot water for multiple showers or taps simultaneously, ensuring that your hot water supply is uninterrupted. This model operates quietly, which is a significant advantage for home environments where noise levels matter.

Energy efficiency is another strong point, as this unit utilizes auto-modulation technology to save energy when hot water isn’t needed, making it eco-friendly. Installation is straightforward since it doesn't require venting, but it does necessitate a minimum electric service of 200 amps, which could limit its compatibility in some homes that don't meet this requirement.

The digital temperature display adds convenience, allowing for easy monitoring and adjustment of the water temperature. In terms of longevity and reliability, Stiebel Eltron backs this product with a 7-year leakage warranty and a 3-year parts warranty, giving users peace of mind.

While the initial installation cost might be higher than traditional tank water heaters, and the requirement for a high electrical service can be a hurdle for some households, its compact design saves space. However, its reliance on electricity may not be ideal for everyone, especially in areas with frequent power outages.

This model is best suited for families or households with high hot water demands who value continuous supply and energy efficiency. If you’re looking for a reliable, quiet, and eco-friendly hot water solution, this Stiebel Eltron model delivers strong performance, but be mindful of your home's electrical capacity before purchasing.

Rating
9.9
Chosen by1,253
Flow Rate (GPM)
Temperature Rise
Installation Requirements

Most important from
2086 reviews

Flow Rate (GPM)
Provides a continuous flow of hot water, even when running multiple showers simultaneously.
Temperature Rise
Precise temperature control ensures you get the hot water you desire without any fuss.
Installation Requirements
Installation is straightforward, but professional installation is recommended for peace of mind.
#2

Rheem 18kW 240V Tankless Electric Water Heater, Gray

Rating
9.8
Power (kW)

Most important from
1965 reviews

Power (kW)
Cheaper than Home Depot, but pulls about 8kW upon use.

The Rheem 18kW Tankless Electric Water Heater is a solid option for households seeking a reliable source of hot water. With a maximum flow rate of up to 4.4 gallons per minute (GPM), it’s suitable for smaller to medium-sized homes, providing enough hot water for multiple outlets at once. The unit boasts a remarkable energy efficiency rating of 99.8%, which can translate to lower electricity bills over time, making it an eco-friendly choice as well.

One of its standout features is the external digital thermostatic control with an LED display, allowing precise temperature adjustments (+/- 1 degree accuracy). This self-modulating technology helps it adjust power usage based on real-time hot water demand, giving you consistent comfort.

Installation is generally straightforward, thanks to its bottom 3/4-inch NPT water connections and wall-mount design. This means you can install it in various locations without too much hassle. However, it may still require a professional for optimal setup, especially if you’re not handy with plumbing. While it performs well in terms of flow rate and efficiency, some users might find the performance insufficient for larger households where simultaneous use of multiple hot water sources is common. Additionally, the unit's reliance on electricity means it won't function during power outages, which could be a concern in areas prone to such interruptions.

Rating
9.8
Power (kW)

Most important from
1965 reviews

Power (kW)
Cheaper than Home Depot, but pulls about 8kW upon use.

Buying Guide for the Best Residential Tankless Electric Hot Water Heaters

Choosing the right residential tankless electric hot water heater can significantly impact your home's comfort and energy efficiency. Tankless water heaters provide hot 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 Rate (GPM)Flow rate, measured in gallons per minute (GPM), indicates how much hot water the unit can produce at a given time. This is crucial because it determines whether the heater can meet your household's hot water demands. For example, a small household with one or two people might need a flow rate of 3-4 GPM, while a larger household with multiple showers and appliances running simultaneously might require 6-8 GPM or more. Assess your peak hot water usage to choose the right flow rate.
Temperature RiseTemperature rise refers to the difference between the incoming water temperature and the desired output temperature. This is important because it affects the heater's ability to provide sufficiently hot water. If you live in a colder climate where the incoming water is very cold, you'll need a unit capable of a higher temperature rise. Conversely, in warmer climates, a lower temperature rise may be sufficient. Consider your local water temperature and your preferred hot water temperature to determine the necessary temperature rise.
Power (kW)The power rating, measured in kilowatts (kW), indicates the electrical power the unit requires to heat the water. Higher kW ratings generally mean the unit can heat water more quickly and handle higher flow rates. For smaller households or less demanding applications, a lower kW rating (around 10-18 kW) may be adequate. Larger households or those with higher hot water demands might need a unit with a higher kW rating (20-36 kW). Match the power rating to your hot water needs and ensure your home's electrical system can support it.
Energy EfficiencyEnergy efficiency measures how effectively the unit converts electrical energy into hot water. This is important for reducing energy consumption and lowering utility bills. Look for units with high energy efficiency ratings, often expressed as a percentage. Models with efficiency ratings of 90% or higher are considered very efficient. Choosing a high-efficiency model can lead to significant savings over time, especially if you have high hot water usage.
Installation RequirementsInstallation requirements include the electrical and space considerations needed to install the unit. This is important because it affects the feasibility and cost of installation. Tankless electric water heaters typically require a dedicated circuit and specific voltage and amperage. Ensure your home's electrical system can accommodate these requirements. Additionally, consider the physical space where the unit will be installed; tankless units are generally compact, but you need to ensure proper ventilation and access for maintenance.
WarrantyThe warranty covers the unit against defects and malfunctions for a specified period. This is important for protecting your investment and ensuring long-term reliability. Warranties can vary significantly, with some offering coverage for 5 years and others for up to 10 years or more. Consider the length and terms of the warranty when choosing a unit, as a longer warranty can provide peace of mind and potential savings on repairs.

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