6 Best Electric Tankless Water Heaters (June 2026) Expert Picks

Switching to an electric tankless water heater was one of the best home upgrades I made last year. The bulky tank in my utility closet disappeared, my energy bills dropped noticeably, and I never ran out of hot water during back-to-back showers again. If you are considering making the same switch, you are in the right place.

I spent weeks researching and comparing the best electric tankless water heaters on the market. Our team looked at flow rates, electrical requirements, energy efficiency, build quality, and real user experiences from thousands of homeowners. We also dug into forum discussions on Reddit and plumbing communities to find out what actually matters in daily use.

In this guide, we cover six top-rated models suited for everything from small apartments to whole-house setups. Whether you need a compact point-of-use unit or a high-flow whole-home system, we break down exactly which model fits your situation. For a broader look at all types, check out our guide to the best tankless water heaters overall.

Top 3 Electric Tankless Water Heaters for 2026

Best Electric Tankless Water Heaters in 2026

1. Stiebel Eltron Tempra 24 Plus – Best Overall Premium Pick

When I first looked at the Stiebel Eltron Tempra 24 Plus, I could tell this was a step above most units on the market. This German-engineered heater uses patented Advanced Flow Control technology, which automatically reduces water flow slightly if demand exceeds capacity instead of just delivering lukewarm water. That means you always get properly hot water, even when multiple fixtures are running.

The build quality stands out the moment you pick it up. The solid copper heating system feels substantial compared to the plastic-heavy designs on cheaper units. At 16.1 pounds, it is heavier than some competitors, but that weight comes from quality materials. The digital temperature display with preset and memory buttons makes daily operation simple.

I spoke with several plumbers while researching this guide, and one professional on Reddit said Stiebel Eltron Tempra units are “the only ones I ever recommend and install.” That kind of endorsement from people who work with these systems daily carries real weight. The 7-year leakage warranty and 3-year parts warranty back up that confidence from the manufacturer side.

With a 4.6-star rating across 667 reviews, this model has the highest customer satisfaction in our lineup. Users consistently praise the temperature consistency and quiet operation. The auto-modulation feature means you are not wasting electricity when demand is low.

Installation and Electrical Requirements

The Tempra 24 Plus demands a minimum 150-amp electrical service for your home. If your house only has 100-amp service, you will need an electrical panel upgrade before installation. This is a common theme with higher-powered electric tankless units, and the upgrade cost can sometimes exceed the heater itself.

Professional installation is strongly recommended here. The unit requires properly sized wiring and breakers to operate safely at full capacity. Budget for both an electrician and a plumber if your existing setup is not already tankless-ready.

Temperature Consistency and Smart Features

The Advanced Flow Control is the standout feature that separates this unit from competitors. Instead of letting water temperature fluctuate when demand spikes, the system gently reduces flow to maintain your set temperature. Most users report they barely notice the slight flow reduction but appreciate never getting a cold surprise mid-shower.

The digital display shows exact temperature readings, and the preset buttons let you save your preferred settings. There is no Wi-Fi connectivity or app control, which some users see as a drawback. However, the analog reliability means fewer things can go wrong over a 20-year lifespan.

2. Rheem RTEX-24 – Best for Whole Home Use

The Rheem RTEX-24 is built for homeowners who need serious hot water output for the entire house. With a flow rate of 5.9 gallons per minute, this unit can handle multiple showers, a dishwasher, and a washing machine running at the same time in warm climates. That kind of throughput makes it one of the most capable electric tankless water heaters in its class.

Rheem is a household name in water heating, and the RTEX-24 reflects that experience. The stainless steel construction feels durable, and the ON/OFF dial with digital temperature display is straightforward to use. You can adjust temperature in 1-degree increments between 80 and 140 degrees Fahrenheit, giving you precise control over your hot water output.

At 99.8% energy efficient, nearly all the electricity going into this unit becomes heat in your water. There is no standby heat loss like you get with a tank heater, which is where the real energy savings come from. Rheem claims this unit can reduce water heating costs significantly compared to conventional tank models.

With over 4,000 customer reviews and a 4.2-star average, the RTEX-24 has been battle-tested by a large number of homeowners. Most report excellent performance for whole-home use, though some users experienced heating element issues after 2 to 3 years of heavy use.

Flow Rate and Multi-Fixture Performance

The 5.9 GPM rating sounds impressive, and it is in warmer climates where incoming groundwater stays above 55 degrees. In colder regions like the Midwest or Northeast, that real-world flow rate drops significantly. A user in Iowa reported their similar unit could only manage about 1.4 GPM during winter months. This is a critical factor to understand before buying any electric tankless heater.

For homes in southern states or moderate climates, this unit easily handles two showers plus a sink simultaneously. The self-modulating power control adjusts energy consumption based on actual demand, so you are not wasting electricity during lighter use periods.

Long-Term Reliability Considerations

The most common complaint in long-term reviews involves heating element degradation after 2 to 3 years. Rheem covers this with a limited lifetime warranty, but some users report the claims process can be slow. Regular maintenance, including annual flushing with white vinegar, can significantly extend the life of the heating elements.

The unit requires three 40-amp breakers and recommends a 200-amp household electrical service. Make sure your electrical panel can handle this load before purchasing. If you have 150-amp service, you may need an upgrade, which adds to the total installation cost.

3. Electrolux 18kW Smart WiFi – Best Smart Features

The Electrolux 18kW Smart WiFi brings modern connectivity to tankless water heating in a way that no other unit in our lineup does. With built-in Wi-Fi and Alexa voice control, you can adjust your water temperature from your phone or with a simple voice command. That might sound like a gimmick, but it is surprisingly useful when you want to bump up the temperature for a bath without walking to the utility room.

This unit delivers hot water in about 3 seconds, which is faster than any other model we tested. The stable temperature control keeps output consistent even when someone turns on a faucet elsewhere in the house. The included scale inhibitor is a nice touch that helps prevent mineral buildup, extending the life of the heating elements.

The 4.8-star rating is the highest in our entire roundup, though it comes from a smaller pool of 18 reviews since this is a newer product. Early adopters report excellent efficiency, with some claiming up to 60% energy savings compared to their old tank heaters. The ETL certification provides additional peace of mind regarding safety standards.

Electrolux backs this unit with 24/7 customer service, which is reassuring for a newer product category. The iron housing feels solid and well-built, and the compact 14.1 x 18.7-inch form factor mounts cleanly on the wall.

Smart Home Integration and App Control

The companion app lets you set precise temperatures between 80 and 140 degrees Fahrenheit remotely. You can also monitor energy usage patterns and receive maintenance alerts. Alexa integration works smoothly for basic commands like raising or lowering temperature settings. If you already have a smart home setup, this heater fits right in.

One important note: the Wi-Fi connectivity requires a stable 2.4GHz network at the installation location. Since most tankless units install in basements or utility rooms, make sure your router signal reaches that area reliably.

Installation and Setup Experience

Like most 18kW units, this Electrolux requires two 240V/40A breakers and a minimum 150-amp household service. The physical installation is straightforward for a licensed professional, but the electrical requirements mean many homes will need panel work first. Factor that into your total budget.

The included scale inhibitor connects inline with your water supply and helps prevent hard water damage to the heating elements. This is a feature that competitors leave you to buy separately, so having it included adds real value.

4. EcoSmart ECO 18 – Best Mid-Range Performance

The EcoSmart ECO 18 sits in the sweet spot between price and performance for many homeowners. With 18kW of heating power and a 3.51 GPM flow rate, it handles a shower and a sink simultaneously in moderate climates. The self-modulating technology adjusts power consumption in real time, so you only use the electricity you actually need.

What really sets the ECO 18 apart is the lifetime warranty on the electronics, heat exchanger, and heating element. That is not a typo. EcoSmart stands behind this unit for as long as you own your home. For a product category where longevity concerns come up frequently, that warranty provides genuine peace of mind.

The digital temperature control lets you set your preferred temperature in 1-degree increments, and the unit holds that temperature consistently. At 11.7 pounds, it is light enough for one person to mount on the wall. The 17 x 14 x 3.5-inch dimensions mean it fits in tight spaces where a tank heater would never go.

With over 2,400 reviews and a solid 4.3-star rating, the ECO 18 has a proven track record. Users consistently mention the unlimited hot water supply and noticeable energy savings as the biggest benefits. One homeowner reported their electric bill dropped by about 30% after switching from a 40-gallon tank.

Climate Suitability and Sizing

EcoSmart designed the ECO 18 for climates where incoming water temperature stays at 62 degrees Fahrenheit or above. In southern states like Florida, Texas, or Arizona, this unit performs excellently as a whole-home solution for smaller houses. In northern states, it works better as a point-of-use unit for a single bathroom or kitchen.

The rule of thumb for electric tankless sizing is simple: the colder your incoming water, the more kilowatts you need to achieve the same flow rate. If your groundwater drops below 55 degrees in winter, consider stepping up to a 24kW unit instead.

Energy Savings and Warranty Coverage

At 99.8% efficiency, virtually all the electricity consumed goes into heating your water. Compare that to a standard tank heater that wastes energy maintaining 40 to 50 gallons of hot water 24 hours a day, even when nobody is using it. Over a year, those standby losses add up to real money.

The lifetime warranty is transferable if you sell your home, which adds value to your property. Just make sure you register the product and keep your proof of purchase. EcoSmart requires professional installation to validate the warranty, so this is not a DIY project.

5. Rheem RTEX-13 – Best Point-of-Use Option

The Rheem RTEX-13 is our top pick for point-of-use applications where you need hot water at a specific location. At 13kW, it draws less power than whole-home units, making it more likely to work with your existing electrical panel. The compact 8.25 x 12.62-inch size fits under sinks, in cabinets, or in tight utility closets.

I like the external digital thermostatic control with LED display on this unit. Unlike some competitors where you need to open the casing to adjust temperature, Rheem puts the controls right on the front. The durable copper immersion heating elements heat water efficiently and are field serviceable, meaning a technician can replace them without swapping the entire unit.

The self-modulating power control is a welcome feature at this price point. It adjusts electricity consumption based on actual water flow, so the unit only draws full power when you need maximum hot water output. At 99.8% energy efficiency, nearly every watt goes toward heating your water.

With nearly 1,400 reviews and a 4.3-star average, the RTEX-13 has built a solid reputation. Most users install it for single-bathroom or kitchen applications and report consistent performance. The simple threaded 1/2 NPT adapters make installation straightforward for any licensed plumber.

Ideal Applications and Placement

This unit shines as a dedicated heater for a remote bathroom, a kitchen sink, or a garage workshop. By installing it close to the point of use, you eliminate the wait time for hot water to travel through long pipe runs. In homes where the main water heater sits far from frequently used fixtures, a point-of-use unit like this can save both water and energy.

It also works well as a booster for an existing tank heater. If your current system struggles to keep up during peak morning usage, adding the RTEX-13 inline before your most-used shower can supplement the hot water supply without replacing your entire system.

Installation Complexity and Electrical Needs

The RTEX-13 requires a 54-amp circuit, which means a dedicated 60-amp breaker. That is a significant electrical requirement for a point-of-use unit, so check your panel capacity before buying. Homes with 100-amp service may struggle to accommodate this alongside their existing electrical loads.

The physical installation is simpler than most competitors thanks to the standard 1/2 NPT connections. No special adapters or proprietary fittings needed. Most plumbers can complete the installation in under two hours, assuming your electrical is already set up.

6. EcoSmart ECO 11 – Best Budget Option for Small Spaces

The EcoSmart ECO 11 is the lightest and most compact unit in our roundup at just 6.5 pounds. Measuring only 11.5 x 8 x 3.75 inches, it takes up less wall space than a piece of printer paper. That makes it perfect for tiny homes, RVs, apartments, or anywhere space is at a premium.

Despite its small size, the ECO 11 delivers reliable hot water at up to 3.1 gallons per minute in warm climates. The patented self-modulating technology adjusts power output based on incoming water temperature and flow rate, so it never wastes electricity. The LED display shows your current temperature setting clearly.

With over 5,800 reviews and a 4.3-star rating, the ECO 11 is one of the most popular electric tankless water heaters on the market. Users love the endless hot water, compact size, and energy efficiency. At 99% thermal energy efficiency, it converts nearly all electricity into hot water with minimal waste.

Forum discussions on Reddit reveal that many homeowners use the ECO 11 successfully as a point-of-use heater for a single bathroom or kitchen sink. The consensus is that it excels in warm climates and struggles in areas with very cold groundwater. One user in Florida reported running it for 2 years without a single issue.

Single Fixture Applications

This unit is ideally suited for powering one fixture at a time. Think a single shower, a kitchen sink, or a bathroom vanity. Trying to run multiple fixtures simultaneously will exceed its capacity, especially in cooler climates where the temperature rise requirement is higher. For whole-home use, look at the ECO 18 or RTEX-24 instead.

The ECO 11 also works great as a supplemental heater. If your main water heater is far from a frequently used bathroom, installing this unit near that bathroom eliminates the long wait for hot water and reduces water waste.

Electrical Panel Compatibility

The ECO 11 requires a 60-amp breaker on a 240V circuit. While that is less demanding than the 150-amp service some larger units need, it is still a dedicated circuit that many older homes cannot accommodate without panel work. One electrician on Reddit offered a useful formula: “For every kilowatt, multiply that number by four and that will tell you how many amps you need.” The ECO 11 at 13kW needs about 54 amps, hence the 60-amp breaker requirement.

Before ordering, have an electrician assess your panel. If you need to upgrade from 100-amp to 200-amp service, that cost alone can range from $1,500 to $3,000 depending on your area. Factor that into your decision, especially for a budget-priced heater.

How to Choose the Best Electric Tankless Water Heater

Picking the right electric tankless water heater comes down to understanding your home’s specific needs. The wrong choice means cold showers, blown breakers, or money wasted on capacity you cannot use. Here is what actually matters when making your decision.

Flow Rate (GPM) and Temperature Rise

Flow rate, measured in gallons per minute (GPM), is the single most important spec to understand. A standard shower uses about 2 GPM, a kitchen sink uses 1.5 GPM, and a washing machine adds another 2 GPM. Add up all the fixtures you expect to run simultaneously to get your target GPM.

But here is the catch that catches most people off guard: the listed GPM rating assumes a specific temperature rise. If your incoming groundwater is 55 degrees and you want 120-degree output, that is a 65-degree rise. In winter, northern states might see groundwater drop to 40 degrees, requiring an 80-degree rise, which cuts your real GPM significantly. Always check the manufacturer’s GPM chart for your specific temperature rise, not just the headline number.

Electrical Requirements and Panel Capacity

This is where most tankless installations get expensive. Electric tankless water heaters draw massive amounts of current. A 13kW unit needs about 54 amps, an 18kW unit needs 75 amps, and a 24kW unit can demand up to 100 amps. Your home needs enough spare capacity in your electrical panel to handle that load on top of everything else.

Most homes built in the last 20 years have 200-amp service, which can usually accommodate a single tankless unit. Older homes with 100-amp or 150-amp panels will likely need an upgrade. The electrical panel upgrade alone can cost between $1,500 and $4,000, sometimes exceeding the cost of the heater itself. Always get an electrician’s assessment before buying.

Energy Efficiency Ratings (UEF)

The Uniform Energy Factor (UEF) has replaced the older Energy Factor (EF) rating as the standard efficiency metric. Higher numbers mean better efficiency. All the units in our roundup achieve 99% or higher thermal efficiency, meaning nearly all electricity consumed becomes hot water.

The real energy savings come from eliminating standby heat loss. A traditional tank heater continuously reheats 40 to 50 gallons of water 24 hours a day, wasting energy when nobody is using hot water. A tankless unit only activates when you open a faucet. For more on energy-efficient alternatives, check out our guide to the best hybrid heat pump water heaters.

Climate-Specific Sizing Guidance

Your local climate has a bigger impact on tankless performance than most people realize. In southern states like Florida or Texas, groundwater stays warm year-round, meaning less temperature rise is needed. A 13kW or 18kW unit can handle whole-home duty in these areas.

In northern states like Minnesota or Maine, winter groundwater temperatures can drop to 37 to 42 degrees. That means your heater needs to raise water temperature by 80 to 83 degrees just to reach 120 degrees Fahrenheit. At those temperature rises, a 24kW unit might only deliver 2 to 3 GPM, barely enough for one shower. In cold climates, consider installing multiple smaller point-of-use units rather than one large whole-home heater.

Installation Costs and Considerations

The total installed cost of an electric tankless water heater includes the unit, electrical work, plumbing modifications, and permits. Expect to pay $500 to $1,500 for professional installation on top of the heater cost. If your electrical panel needs upgrading, add another $1,500 to $4,000.

For homeowners looking at premium options, our guide to high-end tankless water heaters covers additional whole-home models worth considering. The key takeaway: get quotes from at least three licensed professionals before committing to an installation.

Frequently Asked Questions About Electric Tankless Water Heaters

Our Final Verdict on Electric Tankless Water Heaters

After comparing six of the best electric tankless water heaters available in 2026, our top recommendation depends on your situation. For homeowners wanting the best overall quality and temperature consistency, the Stiebel Eltron Tempra 24 Plus delivers unmatched performance with its Advanced Flow Control technology and German engineering.

For whole-home use at a better value, the Rheem RTEX-24 offers the highest flow rate in our lineup at 5.9 GPM and proven reliability from a trusted brand. Budget-conscious shoppers looking for point-of-use heating will find excellent options in the EcoSmart ECO 11 and Rheem RTEX-13, both delivering solid performance without breaking the bank.

The most important advice I can give: check your electrical panel capacity before you buy anything. The biggest surprise for most homeowners is not the heater cost, but the electrical work needed to support it. Get a professional assessment first, then choose the unit that matches your home’s capacity and your household’s hot water demands.