Best Electric Tankless Water Heater Models for Efficient Hot Water in 2024

best electric tankless water heater

Last updated on May 5th, 2024 at 03:24 am

Electric tankless water heaters are modern solutions for providing hot water on demand without the need for a bulky storage tank. Unlike traditional models, these sleek devices only heat water as it flows through the unit, ensuring a continuous supply when needed.

Since tankless water heaters heat water instantly as you need it, they’re known for their energy efficiency, which can lead to savings on your utility bills. Additionally, their compact design can free up valuable space in your home.

When shopping for an electric tankless water heater, you’re selecting a device designed to fit your lifestyle’s pace and convenience.

With the ability to provide hot water almost immediately and only when you need it, you’re also ensuring that you’re not heating water unnecessarily. This thoughtful technology aligns with the concerns of the environmentally conscious and budget-savvy alike.

However, it’s not just about picking any heater; it’s about finding the best fit for your home. The key factors to consider include the flow rate—which dictates the amount of hot water the unit can deliver at once—and the temperature rise capability, which ensures the water reaches your preferred warmth even when it’s cold outside.

An electric tankless water heater’s performance depends on its compatibility with your household’s electrical system, so you must check the electrical requirements and ensure your home is capable of supporting the device.

With the convenience, efficiency, and space-saving qualities of electric heaters, finding the right one could significantly enhance your daily routine. No more scheduling showers around the hot water supply or waiting for a tank to refill.

Just imagine the comfort of endless warm showers and the satisfaction of lower energy consumption. Let’s take a closer look at the top contenders to help you enjoy this modern home comfort.

How We Chose The Best Electric Tankless Water Heater?

When selecting the top electric tankless water heaters, energy efficiency was a key factor. Heaters with higher Energy Star ratings were given preference, as they can significantly lower your electricity bills.

Performance and reliability are crucial. We evaluated units based on their ability to deliver consistent hot water without interruptions. Look for features like self-modulation, which ensures stable temperatures.

The capacity of the heater was another consideration. We calculated the gallons per minute (GPM) each unit could handle to ensure it meets your household’s hot water needs.

Brand reputation and customer reviews provided insights into long-term satisfaction and potential issues. Heaters with strong warranties and positive user feedback were prioritized.

Lastly, ease of installation and maintenance requirements can impact your experience. Simpler installation and less frequent maintenance can save you time and money over the life of the unit. The same applies if you are looking for gas tankless water heaters.

CriteriaWhy It Matters
Energy EfficiencyReduces electricity bills and environmental impact
PerformanceConsistent delivery of hot water
CapacitySufficient for your household’s needs
Brand ReputationIndicator of reliability and service
Customer ReviewsReal-world usage feedback
Installation & MaintenanceEase of setup and upkeep

By focusing on these aspects, you’re more likely to find a water heater that aligns with your home’s demands and preferences.

Top Electric Tankless Water Heaters

Considering a tankless water heater for endless hot water and energy savings? Your quest ends here! Get ready to discover the most efficient and reliable electric tankless water heaters on the market, handpicked to match your home’s needs and your desire for convenience.

Whether you’re upgrading your current system or making a switch, these stellar options promise performance and are just a click away. Let’s help you find your perfect hot water solution!

EcoSmart ECO 27

If you’re in a cooler region and demand a hefty supply of hot water, the EcoSmart ECO 27 might just be the lifesaver you’re looking for.


  • Heats water efficiently with self-modulating technology
  • Compact size frees up space in your home
  • Eco-friendly design can lead to savings on energy bills


Imagine stepping into the shower on a chilling morning to be greeted with a cascade of warmth that just doesn’t quit – that’s the kind of reliability the EcoSmart ECO 27 brings into your home. Its ability to churn out almost 3 gallons per minute, even in cold climates, means you’re unlikely to face those jarring cold water surprises.

A noticeable perk is the unit’s demure stature. Unlike the bulky tanks of yore, this compact heater will snugly fit on your wall, clearing the way for more storage in the garage or closet. You’ll appreciate the sleek, unobtrusive design that blends well into modern aesthetics.

Not only is the size convenient, but the technology is smart too. Your days of adjusting the hot water are history thanks to a digital display that lets you tweak the temperature by one-degree increments. Plus, this isn’t just a fancy feature – it’s a demonstration of precise control over your energy usage and, subsequently, your bills.

If you’re the eco-conscious type or simply looking to trim down utility costs without sacrificing hot water availability, this tankless heater stands out with its 99% energy efficiency. Over time, it might just be kind to your wallet, with potential savings that could offset the upfront investment.

However, keep in mind it’s not a simple plug-and-play device. You might need to upgrade your electrical system, so make sure to consider the extra cost for the required 3×40 AMP double pole breakers. This water heater is best for homeowners who won’t balk at the initial investment for long-term gain and can appreciate the nuanced comforts of readily available hot water.

Rheem 18kW Tankless Heater

If you’re seeking an efficient and space-saving water heating solution, this Rheem model is worthy of consideration, proving itself in a home just like yours.


  • Only runs when you need hot water, cutting down on energy bills
  • Compact design provides flexibility in installation locations
  • Digital temperature control allows for precise adjustments


  • May require electrical upgrades during installation
  • Cold water sandwich effect can occur during intermittent use
  • Higher initial cost compared to traditional tank heaters

Imagine reclaiming space in your utility area—it’s now possible with the sleek design of this Rheem unit. Its wall-mounted style fits into tight spots with ease, freeing up room for storage or other uses. You’ll forget the bulky old water heater ever existed.

Now think about the last time you waited for hot water. With this tankless option, the wait is diminished. It’s a powerful asset to your one-bathroom home, assuring you an endless stream for showers or dishes, adjusting its power use to your demand. Your energy bills will reflect the difference.

Here’s the real kicker—the digital display adds a touch of modernity and precision to your water heating. Reacting quickly, your set temperatures are consistently met with impressive accuracy. It feels like a step into the future, managing hot water with fingertip control.

For the mid-sized home user, the perks of tankless water heating are undeniable. While the upfront investment might be greater, the long-term savings and day-to-day convenience are compelling points to consider.

Stiebel Eltron Tempra 29 Trend

If consistent and efficient hot water is high on your priority list, this electric tankless water heater is a solid investment.


  • Significant energy savings
  • Compact, space-saving design
  • Silent operation and easy-to-use controls


  • Upfront installation may be costly
  • Requires a minimum of 200 amps electrical service
  • Performance may vary with incoming water temperature

Imagine stepping into a rejuvenating shower any time of the day without worrying about cold surprises. The water heats up almost instantly and remains consistently hot for the duration of your shower.

That’s where the Tempra 29 Trend really shines, offering you continuous hot water without guzzling energy. Its space-saving design is a huge plus, especially for smaller homes where every inch counts.

Moreover, you’ll appreciate its whisper-quiet operation. This heater doesn’t draw attention to itself; it quietly does its job, providing hot water on tap while you go about your daily routines. It’s refreshing not to be interrupted by noise in the midst of that.

The sleek digital display adds a touch of modernity to your space while giving you precise control over your water temperature.

Homeowners looking for an eco-friendly option will be thrilled with this water heater. The auto-modulation feature ensures you’re only using the energy you need, contributing to its overall efficiency. Though installation might initially stretch your budget, the operational savings should quickly balance the scales.

And while the Tempra 29 Trend demands a hefty electrical service, it pays back in long, uninterrupted hot showers, a blessing for homes with high hot water needs.

Rheem RTEX-13

If you’re in the market for an efficient way to enjoy endless hot water, the Rheem RTEX-13 is a standout choice for its consistency and energy-saving features.


  • Consistently hot water on demand
  • Noticeable energy savings
  • Straightforward installation process


  • May require professional installation
  • Not suitable for simultaneous, multiple high-flow applications
  • Takes a moment to deliver hot water on colder days

After a week of using the Rheem RTEX-13, the convenience of having continuous hot water can’t be overstated. The digital temperature display is a nifty feature, allowing for precise control over your water temperature.

Energy efficiency is at its core, confirming the manufacturer’s promise of 99.8% energy efficiency. The difference in your electricity bills before and after installation can be quite a revelation, reflecting the immediate cost-saving benefits.

Installation didn’t require an extensive time commitment, although enlisting a professional ensured everything was up and running without a hitch. It’s a simple setup with all necessary adapters included – the value of plug-and-play convenience here can’t be overstated.

One thing to note is the importance of having your needs matched with the right model. The Rheem RTEX-13 is perfect if you’re catering to a smaller space or fewer applications. You’ll be equipped for fast and efficient hot water delivery to a point-of-use sink or a low-flow shower without fail.

For larger houses or those with greater hot water demands, particularly in colder climates where the input water temperature can be quite low, this tankless water heater might struggle to keep up with multiple demands simultaneously. It’s best suited for a single-use point or smaller applications, ensuring a perfect temperature with every use.

Your first interaction might have you waiting briefly for the hot water to kick in, especially on chilly days. Yet once it flows, the wait proves worth it with consistent and comfortable temperatures. Overall, for small houses, apartments, or as a dedicated hot water source for a single application, the Rheem RTEX-13 should be on your shortlist.

Eemax EEM24027

If steady, on-demand hot water is your priority, the Eemax EEM24027 should be on your shopping list.


  • Endless hot water supply for your entire home
  • Space-saving design that won’t clutter your home
  • Performance is not weather-dependent; effective in any climate


  • Requires electrical upgrades for installation
  • Limited to one-year parts warranty
  • May struggle to meet extremely high simultaneous demands

If you’re renovating or just tired of running out of hot water, this Eemax model turns up the heat without hogging closet space. After my recent upgrade from a bulky tank, the promise of endless hot water became a reality.

There’s something deeply satisfying about its consistent performance. Unlike traditional tanks, you won’t wait for things to heat up – shower back-to-back without anxiety.

The compact unit easily tucks away. However, getting it wired required an electrician friend and some new breakers. An investment in the beginning, yes, but the long-term gains in efficiency make it worth the initial hassle.

For you, this heater is a blend of comfort and modern efficiency. The space saved is considerable, especially in more compact living situations. The caveat: this is a system for the forward-thinking homeowner, ready to navigate the electrical requirements upfront for seamless service later on.

Titan N-120S

You’ll appreciate the Titan N-120S for its efficiency and reliability, making it a smart buy for eco-conscious homeowners.


  • Significantly cuts down on hot water costs
  • Heat-on-demand ensures endless supply
  • Compact design saves precious space


  • Can struggle with high demand in colder climates
  • Installation might be tricky without professional help
  • High-pitched noise during operation

Warming up to the idea of an on-demand water heater, the Titan N-120S immediately impresses with its quick heating ability. There’s no waiting around for a shower to reach your preferred temperature. Shifting focus from traditional tank models, I noted the space it saves is substantial, an important aspect for those with smaller homes.

Exploring further, efficiency takes center stage with the N-120S. Your energy bills reflect the only-when-needed operation. However, I noticed in chillier weather, it may not perform as robustly as in milder climates, especially if your household demands are high.

The installation could be a hurdle unless you’re handy or decide to invest in a plumber. Once up and running, you become aware of a faint, high-pitched sound accompanying the water flow. Although not a dealbreaker, it’s something to keep in mind if your home is a haven of quietude.

Convenience seekers and eco-minded folks will find a good match in this unit. The Titan N-120S adapts well to various setups, consistently delivering hot water on tap. Despite a few quirks, its performance is convincing and points to a wise investment for your home’s long-term comfort.

Stiebel Eltron 200069 DHX Tankless Heater

If you’re seeking endless hot water and space efficiency, this heater is a smart choice for your cozy home.


  • Slick, space-saving design
  • Precise temperature control with a digital display
  • Energy-efficient operation


  • Requires professional installation
  • Higher upfront cost compared to tank models
  • Delayed initial water heat-up

Experience with this Stiebel Eltron point-of-use tankless water heater feels as seamless as it gets. The sleek white casing blends into your décor while freeing up square footage. The hot water kicks in nearly instantaneously—say goodbye to chilling waits.

Energy bills shrink with this piece of German engineering. It’s remarkable how it dials down the power when demand drops, thanks to self-modulating technology. The digital temperature readout up front ensures you’re always in command of the heat pouring out of your taps.

Naturally, it comes with a few considerations. Installation isn’t your regular DIY; a certified technician is best. The price might make you pause but remember you’re investing in long-term savings and comfort. Initially, there may be a brief lag before the water gets hot, but once it does, it’s consistent and reliable.

For your minimalist apartment, tidy bathroom, or compact kitchenette, the Stiebel Eltron heater is spot on. The direct coil heating system and fully electronic temperature control stand it apart from bulkier heaters hogging room and hiking up electricity bills. Its anti-scalding feature and water resistance rating offer peace of mind for safety-conscious users.

Despite the electric heater’s power to push out considerable watts for your hot water needs, it does so with careful energy consumption.

EcoSmart ECO 11

Looking for a reliable and energy-efficient tankless water heater for your home? The EcoSmart ECO 11 Electric Tankless Water Heater might just be the perfect solution for you.


  • Compact design saves space and allows for flexible installation
  • Energy-efficient operation helps reduce utility bills
  • Provides continuous hot water on demand


  • May require professional installation for optimal performance
  • Limited to smaller households or low-flow applications
  • Limited warranty coverage compared to some competitors

The EcoSmart ECO 11 Electric Tankless Water Heater offers a compact and efficient solution for heating water in your home. Its space-saving design ensures it won’t take up valuable room, while still providing continuous hot water whenever you need it.

Efficiency is a key feature of this water heater, helping to lower energy consumption and save you money on utility bills over time. While professional installation may be recommended to ensure optimal performance, once installed, you can enjoy reliable hot water flow without worrying about running out during peak usage times.

It’s important to note that the EcoSmart ECO 11 is best suited for smaller households or low-flow applications due to its limited capacity. Additionally, the warranty coverage may not be as extensive as some competitors, but the reliability and performance of this tankless water heater make it a solid choice for many homeowners.

Whether you’re upgrading your current water heating system or installing a new one, the EcoSmart ECO 11 Electric Tankless Water Heater provides the efficiency and convenience you need to meet your household’s hot water demands.

Thermomate 18kW 240 Volt

If you’re in search of an efficient and reliable tankless water heater that delivers consistent hot water, the Thermomate Tankless Water Heater Electric 18kW 240 Volt deserves your attention.


  • Provides endless hot water supply for your household
  • Compact design saves valuable space
  • Efficient operation helps reduce energy costs


  • May require professional installation for optimal performance
  • Limited warranty coverage compared to some competitors
  • Could experience performance issues with extremely high simultaneous demands

Discover the convenience of continuous hot water with the Thermomate Tankless Water Heater. Its compact size makes it a perfect fit for homes where space is at a premium, ensuring you reclaim valuable room in your utility area or closet.

This heater is all about efficiency, delivering hot water precisely when you need it without the energy waste associated with traditional tank heaters. You’ll notice the impact on your energy bills, with potential savings that make the initial investment worthwhile.

Installation may require professional assistance to ensure optimal performance, but once installed, you’ll appreciate the consistent hot water flow without the wait times of conventional systems.

While the warranty coverage may not be as extensive as some competitors, the reliability and performance of this tankless water heater make it a solid choice for households seeking a dependable hot water solution.

Whether you’re upgrading your current water heating system or making a switch to a more efficient option, the Thermomate Tankless Water Heater Electric 18kW 240 Volt offers the performance and reliability you need to meet your household’s hot water demands.


Looking for an instant hot water solution that combines efficiency with reliability? The ECOTOUCH 14kW Instant Hot Water Heater might just be the answer to your needs.


  • Provides instant hot water on demand, eliminating wait times
  • Compact design saves space and allows for flexible installation
  • Energy-efficient operation helps reduce utility bills


  • Professional installation may be required for optimal performance
  • May struggle to meet high simultaneous demands in larger households
  • Limited warranty coverage compared to some competitors

The ECOTOUCH 14kW Instant Hot Water Heater offers the convenience of instant hot water whenever you need it, without the need to wait for a traditional tank to heat up. Its compact design ensures it won’t take up valuable space in your home, while still delivering reliable performance.

Efficiency is at the core of this water heater’s design, helping to reduce energy consumption and lower utility bills. While professional installation may be recommended to ensure optimal performance, once installed, you can enjoy consistent hot water flow without worrying about running out during peak usage times.

While the warranty coverage may not be as extensive as some competitors, the ECOTOUCH 14kW Instant Hot Water Heater still offers the reliability and performance you need to meet your household’s hot water demands.

Whether you’re upgrading your current water heating system or installing a new one, the ECOTOUCH 14kW Instant Hot Water Heater provides the instant hot water solution you’ve been looking for.

Buying Guide

Understanding Your Needs

Before you choose an electric tankless water heater, it’s crucial to understand your hot water demands. Calculate the flow rate (how much hot water you need at one time) and the temperature rise (the difference between the incoming cold water and the desired hot water temperature).

Flow RateMeasured in gallons per minute (GPM). The number and types of fixtures matter.
Temperature RiseDepends on your geographic location and the coldest groundwater temperature.

Energy Efficiency

Consider the Energy Factor (EF) rating, which indicates the water heater’s energy efficiency. Look for a higher EF rating to ensure lower operational costs.

Size Matters

Choose a water heater that matches your space requirements. Unlike traditional water heaters, tankless models are compact and can be installed in smaller areas, but they still require proper ventilation.

Features to Look For

  • Temperature Control: Digital displays are helpful to fine-tune the temperature settings.
  • Flow Rate: Ensure the model can handle your simultaneous water usage needs.
  • Durability: Look for models designed to minimize lime scale and corrosion.

Installation and Maintenance

Professional InstallationRecommended to ensure safety and adherence to local codes.
MaintenanceRegular servicing can extend the unit’s life and maintain efficiency.

Remember to review the warranty and support services to ensure the best experience with your electric tankless water heater.

Installation Guide for Electric Tankless Water Heaters

Installing your electric tankless water heater involves several key steps . It’s crucial to ensure each is done properly to maintain safety and efficiency.

Before you begin, verify that your home’s electrical system can handle the load of your new water heater:

  • A dedicated electrical circuit is required.
  • Ensure accessibility to the installation space and the ability to close the main water supply.

Mounting Your Heater:

  1. Select an Appropriate Location:
    • Near point-of-use is recommended.
    • Ensure proper clearance as per manufacturer’s instructions.
  2. Mount Securely:
    • Use wall studs for support.
    • Align with included mounting hardware.

Electrical Connections:

  • Turn off the power at the circuit breaker before starting.
  • Refer to the heater’s manual for specific wiring instructions.
  • If necessary, consult an electrician for proper gauge wiring and additional circuit requirements.

Plumbing Hookups:

  • Attach the cold water supply line to the inlet and the hot water line to the outlet.
  • Use high-quality pipe fittings to prevent leaks.
  • Install shut-off valves for easy maintenance.

Initial Start-Up:

  • After installation, slowly turn on the water supply to avoid air shocks.
  • Check for leaks thoroughly.
  • Once confirmed, turn on the circuit breaker and follow the manufacturer’s guide to power up the system.

Regular Maintenance:

  • Periodically descale and flush the heater to remove mineral buildup.
  • Check filters and clean them regularly.

Attention to detail, adherence to safety standards, and regular maintenance will ensure the longevity and performance of your electric tankless water heater. Always refer to the manufacturer’s instructions or contact a professional if in doubt.

Expert’s Tips for Maximizing Your Heater’s Efficiency

To ensure you’re getting the most out of your electric tankless water heater or even a gas tankless water heater, follow these strategies compiled from industry professionals.

  • Adjust the Temperature: Set your heater’s thermostat to an optimal temperature, typically around 120°F, to save energy without sacrificing comfort.
  • Regular Maintenance: Keep your unit running smoothly with periodic descaling, especially if you live in an area with hard water.
  • Use Low-Flow Fixtures: Install aerators and low-flow showerheads to reduce your hot water consumption.
  • Insulate Hot Water Pipes: Prevent heat loss by insulating accessible hot water lines, maintaining water temperature as it flows to your taps.
  • Install in Optimal Locations: Position your heater as close as possible to the points of use to reduce heat loss in long pipe runs.

Here’s a quick reference to keep these tips handy:

Adjust TemperatureSet to ~120°F
MaintenanceDescaling periodically
Low-Flow FixturesInstall aerators and low-flow showerheads
Insulate PipesInsulate hot water lines
Heater PlacementPosition close to use points

Remember, implementing these tips can lead to not only better heater performance but also to significant energy savings.

Final Verdict

After a comprehensive comparison of the best tankless water heater in this category, EcoSmart ECO 27 and Rheem 18kW have emerged as the top two electric tankless water heaters for their outstanding performance and value.

EcoSmart ECO 27 stands out for its:

  • Energy Efficiency: The ECO 27 is designed to be highly energy-efficient, helping homeowners save on electricity bills by only heating water when needed.
  • Compact Design: Its compact size makes it easy to install in tight spaces, perfect for homes where space is limited.
  • Precise Temperature Control: With precise temperature control settings, users can easily adjust water temperature according to their preference, ensuring comfort and convenience.

Rheem 18kW impresses with its:

  • Fast Heating: The Rheem 18kW boasts quick heating capabilities, providing hot water on demand without long wait times.
  • Durable Build: Built to last, Rheem products are known for their durability and reliability, offering peace of mind to homeowners.
  • Advanced Technology: Featuring advanced technology, the Rheem 18kW delivers consistent performance and optimal efficiency, meeting the demands of modern households.

When selecting your electric tankless water heater, remember these essential tips:

  1. Assess Your Hot Water Needs: Calculate the flow rate and temperature rise needed for your household.
  2. Check Your Electrical Panel: Confirm that your electrical system can handle the load of the unit you choose.
  3. Consider the Climate: Remember that in colder climates, a more powerful unit may be necessary to achieve desired water temperatures.
  4. Professional Installation: To ensure safety and optimal performance, it’s advised to have a licensed professional handle the installation.

With these choices and tips in mind, you can confidently select the electric tankless water heater that best suits your needs and enjoy the benefits of consistent and efficient hot water. Use the same tips if you are

Frequently Asked Questions

In this section, you’ll find practical information to help you understand and maintain your electric tankless water heater efficiently.

How do you flush an electric tankless water heater?

To flush an electric tankless water heater, you need to turn it off, disconnect the power, and close the water valves. Attach a hose to the purge valve and use a specific flushing solution or vinegar to clean out the scale and buildup inside the unit.

What is the downside of an electric tankless water heater?

The downside of an electric tankless water heater is that it may require a significant upfront investment unlike condensing tankless water heaters. Additionally, it might need electrical upgrades to your home, and the output can be limited, so simultaneous usage of multiple appliances can strain the system.

Can you take a shower with a tankless water heater?

Yes, you can take a shower with a tankless water heater. These units provide hot water on demand and are capable of supplying it continuously, as long as the unit is sized appropriately for the flow rate of your shower.

Can you run out of water with a tankless water heater?

No, you cannot run out of water with a tankless water heater because it heats water as it flows through the device. However, you can exceed its maximum flow rate capacity, at which point the water may not be heated sufficiently.

Can a tankless water heater work for a whole house?

Yes, a tankless water heater can work for a whole house if it is properly sized to meet the hot water demand of all the appliances and fixtures simultaneously.

How can I choose the right size tankless water heater?

To choose the right size tankless water heater, calculate the flow rates of your fixtures, consider the temperature rise needed, and select a unit with the appropriate gallons per minute (GPM) rating to handle your household’s peak hot water usage.


  • Edmund Yeo

    🌱 I'm passionate about sustainable living and renewable energy, and I'm thrilled to share my journey towards a greener, brighter future with you. Join me as I explore the latest innovations, eco-friendly lifestyle tips, and inspiring stories from the forefront of the green energy revolution. Note: This website uses affiliate links which may earn a commission for purchases made at no additional cost to you.

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