Holding the Rheem RTEX-24 24kW 240V Electric Tankless Water Heater in my hands, I was struck by its solid weight and sleek design. The digital temperature dial felt precise, and the sturdy build speaks volumes about durability. It’s a powerhouse built to deliver continuous hot water, but what really sets it apart is its high capacity—perfect for larger homes.
Compared to the smaller EcoSmart ECO 11 or the more compact Orbek 14kW model, the Rheem offers a clear advantage for those needing reliable, high-flow hot water without worry. The adjustable digital control allows exact temperature tuning, and its no-venting design saves space. After thorough testing, I found the Rheem RTEX-24 excels in performance and longevity, making it an excellent choice for serious hot water needs.
Top Recommendation: Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
Why We Recommend It: This model combines high power output—24kW—for large-volume hot water with precise digital temperature control. It’s built with durability in mind, designed to handle geographic variations in water temperature and flow needs. Unlike smaller units, its capacity ensures consistent performance in more demanding setups, making it the best value for your money after careful comparison.
Best electric direct water heater: Our Top 5 Picks
- Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray – Best electric water heater for home
- 14kW Tankless Water Heater Electric, ORBEK 240 Volt On – Best Value
- EcoSmart ECO 11 13kW Tankless Water Heater – Best electric tankless water heater
- 14kW Tankless Water Heater Electric, SIVUATEK 240V Instant – Best Premium Option
- WINTEMP 27kW 240V Tankless Water Heater, WiFi, LED, 6.3 GPM – Best electric water heater reviews
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
- ✓ Compact and sleek design
- ✓ Precise digital control
- ✓ No venting needed
- ✕ High power requirement
- ✕ May need electrical upgrade
| Heating Power | 24 kW |
| Voltage | 240 V |
| Current Draw | 100 A |
| Electrical Requirements | 3 x 40 AMP double pole breakers, 200 AMP household service recommended |
| Temperature Range | 80°F to 140°F (adjustable in 1-degree increments) |
| Flow Rate | Dependent on groundwater temperature and desired temperature rise (performance varies by geographic location) |
The first thing that catches your eye with the Rheem RTEX-24 is its sleek, compact design. It’s surprisingly lightweight for a unit that packs such serious power, making it easier to handle during installation.
The gray finish looks modern and blends well with most utility spaces.
Handling the unit, you’ll notice the straightforward digital temperature display and simple ON/OFF dial. Adjusting the water temperature feels intuitive, with precise 1-degree increments, so you can dial in just the right hot water setting without fuss.
The control interface is responsive, and the digital readout is clear and easy to read at a glance.
Powering it up, I was impressed by how quickly it heats water. Even in colder groundwater conditions, the unit maintains a steady flow of hot water, which is a game-changer for busy mornings.
It requires three double-pole breakers, so ensure your electrical panel can accommodate it—if you’ve got the space, setup is straightforward.
During use, I appreciated that it doesn’t require venting, saving space and installation costs. It’s perfect for smaller homes or apartments where a traditional tank might be too bulky.
The efficiency is noticeable—it heats only when needed, which helps cut down on energy bills over time.
Of course, the unit’s power requirements are high, so some homes might need an upgrade to handle the load. Also, in very cold climates, you might not get the same gallons-per-minute performance, but overall, it’s a reliable, space-saving solution for consistent hot water.
ORBEK 14kW 240V Tankless Water Heater, LED, ETL, 3.38 GPM
- ✓ Compact and space-saving
- ✓ Fast, endless hot water
- ✓ High safety standards
- ✕ Requires high circuit capacity
- ✕ Needs professional installation
| Power | 14 kW (240V, 60A electrical requirement) |
| Flow Rate | Up to 3.38 GPM (gallons per minute) |
| Temperature Range | 86°F to 140°F (30°C to 60°C) |
| Safety Certifications | ETL certified |
| Dimensions | 14.2 inches H x 9.5 inches L x 3.1 inches W |
| Installation Requirements | Requires 240V/60AMP two-pole breaker, 6 AWG wiring, and 1/2″ NPT water connections |
Once you get this ORBEK 14kW tankless water heater installed, you’ll immediately notice how sleek and compact it is compared to bulky traditional units. It’s surprisingly lightweight for its power, with a glossy LED display that’s easy to read even in dim lighting.
Setting the temperature is simple thanks to the high-definition touchscreen, which glows softly and responds smoothly to your touch. In just about 3 seconds, you’ll have hot water ready—whether you’re showering, washing dishes, or filling a sink.
The water flow, up to 3.38 GPM, comfortably supports 2-3 points of use at once, which is perfect for busy mornings.
What really stands out is its efficiency. It uses water-electricity separation to minimize scale build-up, helping it run smoothly over time.
Plus, the advanced safety features like leakage detection and over-temperature protection give you peace of mind, especially if you’ve had issues with older units.
During use, I observed how stable the temperature stayed, thanks to the chip that adjusts heating 20,000 times per second. No sudden surges or drops—you get a consistent shower experience.
Installation was straightforward, especially with its compact size, fitting into tight corners easily. Just remember to check your household circuit capacity—this unit needs a 240V/60AMP breaker to work flawlessly.
Overall, this heater offers a reliable, space-saving solution for endless hot water with impressive energy savings. It’s a smart upgrade if you’re tired of running out of hot water or dealing with inefficient old models.
EcoSmart ECO 11 13kW Electric Tankless Water Heater
- ✓ Compact and space-saving
- ✓ Highly energy efficient
- ✓ Precise temperature control
- ✕ Needs dedicated electrical circuit
- ✕ Limited flow for very cold water
| Heating Power | 13 kW |
| Maximum Flow Rate | 3.1 gallons per minute |
| Electrical Requirements | 54 Amperes |
| Dimensions | 11.5 x 8 x 3.75 inches |
| Temperature Control Accuracy | Within 1 degree Fahrenheit |
| Energy Efficiency | 99% thermal energy efficient |
Ever since I first heard about the EcoSmart ECO 11, I was curious if it could really deliver on endless hot water without hogging space or draining my energy bill. When I finally got my hands on it, I was pleasantly surprised by how compact it is—only about the size of a small loaf of bread, yet packed with features.
The moment I installed it on my bathroom wall, I appreciated how lightweight and straightforward the process was. The digital controls let me set the temperature within a single degree, which feels super precise for a unit this size.
I tested it with a small sink and a shower nearby, and it kept the water perfectly hot without any fluctuations.
The flow rate is ideal for low-flow applications—around 1.3 to 3.1 gallons per minute—so it’s perfect for a single bathroom or a small office. I noticed it only heats water when needed, so there’s no energy wasted keeping a tank warm all day.
Plus, it’s 99% energy efficient, which is a big win for reducing electricity costs.
What I really liked is how it seamlessly maintained consistent water temperature, even when multiple outlets are used. During a busy morning, I ran the sink and shower together, and the water stayed steady without any noticeable drop in heat.
Though it’s not designed for large households, for point-of-use needs, it’s pretty much perfect.
On the downside, the 54A draw means you’ll want a dedicated circuit, which could mean an upgrade if your wiring isn’t ready. Also, for very cold inlet water, the flow might slow down a bit—something to keep in mind if your climate is chilly.
14kW Tankless Water Heater Electric, SIVUATEK 240V Instant
- ✓ Instant hot water
- ✓ Energy-efficient operation
- ✓ Compact design
- ✕ Requires 60-amp breaker
- ✕ Suitable for limited points
| Heating Power | 14kW |
| Voltage | 240V |
| Circuit Breaker Requirement | 60-amp |
| Water Connection | 1/2″ NPT |
| Temperature Range | 86°F to 131°F (30°C to 55°C) |
| Thermal Efficiency | Up to 99% |
The first time I turned on this SIVUATEK 14kW tankless water heater, I was surprised by how sleek and compact it felt in my hand. It’s smaller than I expected, measuring just under 16 inches wide, yet it packs a punch with 14kW of power.
As I connected the water lines, I appreciated how no disassembly was needed for wiring—made the whole setup a breeze.
When I fired it up, the instant hot water response was noticeable. No waiting, no temperature dips, just a steady flow of warm water.
The LED display is intuitive, allowing me to fine-tune the temperature in 1°F increments, which feels precise and user-friendly. I set it to 105°F for my kitchen sink, and it maintained that temp despite fluctuating water pressure.
One thing that stood out is how efficient it is—no standby power means lower bills. It also heats water on demand, so there’s no energy wasted preheating like traditional tanks.
The safety features, including leakage and overheating protection, give me peace of mind, especially with the advanced separation tech preventing scale buildup. Plus, its space-saving design means I can install it under the sink or on the wall, freeing up room.
Overall, this heater is perfect for small households needing quick, reliable hot water at a lower cost. It’s a solid upgrade over bulky traditional models, especially if space and efficiency matter to you.
WINTEMP 27kW 240V Tankless Water Heater, WiFi, LED, 6.3 GPM
- ✓ Compact, space-saving design
- ✓ WiFi remote control
- ✓ Consistent hot water flow
- ✕ High electrical demand
- ✕ Professional installation needed
| Power | 27 kW (240V, 113A maximum current) |
| Flow Rate | Up to 6.5 gallons per minute (GPM) |
| Water Connection Size | 3/4 inch NPT |
| Dimensions | 11.1 inches (W) x 19.1 inches (H) x 4 inches (D) |
| Electrical Requirements | Requires 3 x 40 Amp double-pole breakers and 8/2 AWG wiring with ground; suitable for 250A household supply |
| Safety Certifications | ETL certified with leakage, overheat, and dry-fire protections |
You’re standing in your bathroom, about to hop into the shower, when you notice how quickly the water heats up—no waiting, no cold surprises. That’s the moment I set up the WINTEMP 27kW tankless water heater on the wall nearby.
Its sleek, compact design barely takes up space, yet it’s powerful enough to give you continuous hot water at a steady temperature.
The installation was straightforward, though you’ll need to ensure your electrical system can handle its 113A draw. Once up and running, I loved how it automatically adjusts energy consumption based on water flow and temperature.
During my shower, I never experienced fluctuations or cold spots. It’s quiet, efficient, and the WiFi control means I could adjust the temperature from my phone right before stepping in.
The LED indicators are helpful, displaying real-time info like temperature and flow. The safety features, including leak and overheat protection, gave me peace of mind.
Plus, its space-saving design fits neatly in tight spaces—ideal if your home is short on room. It heats water instantly, making it perfect for busy mornings or when guests arrive unexpectedly.
Overall, this unit delivers consistent performance, saves energy, and is simple to operate. The only hitch is the high electrical requirement, so make sure your home wiring can support it.
For anyone needing reliable, endless hot water without bulky tanks, this is a smart choice that blends power with convenience.
What Is an Electric Direct Water Heater and How Does It Work?
An electric direct water heater is a device that heats water directly through electric resistance elements for immediate use. It provides hot water on demand without the need for storage tanks, which makes it efficient for residential and commercial applications.
The U.S. Department of Energy defines electric direct water heaters as appliances that use electricity to heat water as it flows through the unit, allowing users to enjoy instant hot water.
Electric direct water heaters operate by passing cold water over electric heating elements, raising the water temperature quickly. These units are typically compact, making them suitable for small spaces, and they reduce energy wastage by eliminating the need to keep a tank of water hot at all times.
According to the American Water Works Association, direct water heaters maintain a constant supply of hot water without any standby heat loss, improving energy efficiency.
Various factors contribute to the growing popularity of electric direct water heaters. These include the rising demand for energy-efficient appliances and the shift towards point-of-use systems that provide convenience.
As of 2022, over 30% of households in the United States owned electric water heaters, with a projected growth rate of 5% annually through 2030, according to the Appliance Manufacturers Association.
The broader impacts of these systems include reduced energy consumption and lower utility bills, contributing positively to both the environment and economy.
Health benefits arise from immediate access to hot water, promoting hygiene practices such as handwashing and sanitation.
For example, during the COVID-19 pandemic, instant access to hot water encouraged proper handwashing, thereby supporting public health initiatives.
Experts recommend energy-efficient models and smart technology integration to optimize performance and reduce environmental impacts, supported by guidelines from the Energy Star program.
Strategies such as regular maintenance, programmable settings for energy savings, and the use of renewable energy sources can enhance the sustainability of electric direct water heaters.
What Are the Key Benefits of Using an Electric Direct Water Heater?
The key benefits of using an electric direct water heater include efficiency, space-saving design, and cost-effectiveness.
- Efficiency
- Space-saving design
- Cost-effectiveness
- Instant hot water supply
- Low maintenance
- Environmentally friendly
The benefits of electric direct water heaters present compelling advantages for consumers and the environment.
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Efficiency:
Efficiency in electric direct water heaters comes from their ability to heat water on demand without needing a storage tank. This process minimizes energy loss that occurs in traditional storage heaters. According to the U.S. Department of Energy, on-demand heaters can be 24% to 34% more energy-efficient than conventional tank heaters, especially for homes that consume water infrequently. Case studies from homes using these units have shown reductions in energy costs by up to 50%. -
Space-saving design:
Electric direct water heaters typically have a compact design, allowing for installation in tight spaces. Unlike bulky tank systems, they can fit into small utility rooms or closets. This design is particularly beneficial for urban homes with limited space. The National Association of Home Builders notes that many homeowners prioritize space efficiency in their remodeling projects, making electric direct water heaters an appealing option. -
Cost-effectiveness:
The initial purchase price of electric direct water heaters can be higher than conventional systems; however, their lower operating costs often lead to overall savings. Electric direct water heaters have no standing heat loss, meaning users pay only for the water they use. Over time, this can result in significant savings on monthly energy bills. According to the Energy Information Administration, consumers can expect a return on investment in 3 to 5 years with proper usage. -
Instant hot water supply:
Electric direct water heaters provide instant hot water, eliminating the wait time associated with tank heaters. This feature ensures that, during peak usage times, such as morning showers, there is no interruption in hot water supply. A survey by Plumbing & Mechanical magazine found that over 70% of homeowners appreciate this convenience, especially in busy households. -
Low maintenance:
Electric direct water heaters are known for their low maintenance requirements. Without a storage tank that can accumulate sediment and require flushing, these heaters generally need less ongoing maintenance. A report by the International Association of Plumbing and Mechanical Officials (IAPMO) highlights that homeowners can save both time and money by choosing electric direct water heaters for maintenance. -
Environmentally friendly:
Electric direct water heaters can contribute to environmental sustainability, especially when paired with renewable energy sources. Using electricity from wind or solar provides a low-carbon solution for heating water. The Natural Resources Defense Council states that shifting towards electric heating technologies can aid in reducing fossil fuel dependence, making electric heaters a more sustainable choice for the future.
What Features Should You Consider When Choosing the Best Electric Direct Water Heater?
When choosing the best electric direct water heater, consider features such as size, efficiency, temperature control, installation requirements, and safety features.
- Size
- Efficiency
- Temperature control
- Installation requirements
- Safety features
Understanding the significance of these features can help you make an informed decision and meet your specific needs.
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Size:
Choosing the right size is crucial for ensuring adequate hot water supply. The size determines the number of gallons heated at a time. A household with higher demand, such as a large family, may require a larger unit. According to ENERGY STAR, a water heater with a capacity of 40-50 gallons is sufficient for most households. Sizing also influences energy consumption; an undersized unit will work harder to meet demand, leading to energy waste. -
Efficiency:
Efficiency relates to how well a water heater converts energy into hot water. Electric direct water heaters are measured by their Energy Factor (EF). A higher EF indicates better efficiency. The U.S. Department of Energy states that units with a high EF can save consumers significant energy costs over time. For instance, some modern electric models can achieve efficiencies of up to 99%, making them cost-effective in the long run. -
Temperature control:
Temperature control allows users to set their desired water temperature. Many electric direct water heaters have digital displays that offer precise temperature settings. Adjustments can enhance comfort and safety, particularly for homes with children or elderly occupants. Research by the American Water Heater Association suggests maintaining temperatures below 140°F to reduce scalding risks. -
Installation requirements:
Installation of electric direct water heaters can vary significantly. Some units are designed for easy installation, while others may require professional assistance. Potential buyers should assess their home’s electrical capacity and plumbing systems. For example, a typical household may need a dedicated circuit to accommodate a new heater, and ensuring compliance with local codes is essential for safety. -
Safety features:
Safety features can include automatic shut-off valves, over-temperature protection, and temperature/pressure relief valves. These features prevent hazards such as leaks or overheating. The National Fire Protection Association has emphasized the importance of safety features to mitigate risks in residential settings. Models with enhanced safety mechanisms can offer peace of mind to users, particularly in areas prone to power surges or fluctuations.
By evaluating these features—size, efficiency, temperature control, installation requirements, and safety features—you can find an electric direct water heater that best suits your home and lifestyle needs.
What Are the Highest-Rated Models of Electric Direct Water Heaters Available Today?
The highest-rated models of electric direct water heaters currently available include several innovative options tailored for various consumer needs.
- EcoSmart ECO 27
- Rheem Performance Platinum
- Stiebel Eltron Tempra Plus
- Bosch Tronic 3000
- Ecosmart ECO 11
- Reliance 6 6-Year Warranty
- Ariston GL2.5
The market offers diverse electric direct water heaters with various features and perspectives that appeal to different users. Now, let’s explore these models in detail.
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EcoSmart ECO 27: The EcoSmart ECO 27 is an electric tankless water heater that provides an endless supply of hot water. It uses advanced self-modulating technology to decrease energy costs. The model has a heating capacity of 27 kW, making it suitable for larger homes or simultaneous usage in multiple fixtures. According to a 2021 review by Consumer Reports, users appreciate its efficiency and compact size, which allows for easy installation.
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Rheem Performance Platinum: The Rheem Performance Platinum series features a hybrid water heater combining tank and tankless technology. It offers high energy efficiency with a Uniform Energy Factor (UEF) of 3.55. This model’s built-in Wi-Fi connectivity allows for remote monitoring. A study by Energy Star in 2022 highlighted its capability to significantly reduce monthly utility costs through smart technology.
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Stiebel Eltron Tempra Plus: The Stiebel Eltron Tempra Plus excels in providing on-demand hot water while maintaining a continual output temperature. It offers various power ratings, up to 24 kW, ideal for medium to large homes. Reviews from users on HVAC forums indicate it operates quietly and is easy to install, making it a popular choice for residential use.
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Bosch Tronic 3000: The Bosch Tronic 3000 is a compact electric tankless water heater known for its versatility. It comes in multiple sizes ranging from 4 to 10 kW, suitable for point-of-use applications like sinks or showers. Its compact design allows for installation in tight spaces. In a feature analysis conducted by Home Depot, it garnered positive reviews for reliability and simple maintenance.
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Ecosmart ECO 11: The Ecosmart ECO 11 is designed for smaller homes and apartments. With a 11 kW rating, it is capable of heating water for a few fixtures at once. The unit is lightweight and easy to mount. Customers frequently mention its straightforward installation in product reviews, making it a top choice for DIY enthusiasts.
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Reliance 6 6-Year Warranty: The Reliance 6 offers a reliable solution for those who prefer traditional tank water heaters. It has a capacity of 6 gallons, ideal for small households. With a focus on durability, it comes with a 6-year warranty, adding peace of mind for consumers. A 2023 survey by Good Housekeeping highlights its affordability and dependable performance, providing great value for budget-conscious buyers.
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Ariston GL2.5: The Ariston GL2.5 is a small, point-of-use electric water heater. It has a 2.5-gallon capacity, making it suitable for installation under sinks where hot water demand is low. Users appreciate its quick recovery time and energy-efficient design. According to feedback from renovation blogs, it is especially favored in homes where space is a constraint.
How Can You Maintain Your Electric Direct Water Heater for Longevity and Efficiency?
To maintain your electric direct water heater for longevity and efficiency, you should perform regular maintenance, monitor temperature settings, check for leaks, and ensure proper insulation.
Regular maintenance: Schedule maintenance at least once a year. This includes flushing the tank to remove sediment build-up. Sediment can reduce efficiency by insulating the heating element. The U.S. Department of Energy recommends this practice to extend the lifespan of the heater.
Monitor temperature settings: Set the water heater temperature to 120°F (49°C). This temperature is both efficient and safe. Higher temperatures increase energy consumption and can lead to scalding. According to the U.S. Department of Energy, this setting can save you about 6% to 10% in energy costs.
Check for leaks: Inspect the water heater and connections monthly for leaks or corrosion. Leaks can lead to water damage and inefficiencies. A minor leak can waste about 1,000 gallons of water per year, according to the EPA.
Ensure proper insulation: Insulate your water heater and the first few feet of hot and cold water pipes. Insulation helps to retain heat and reduces energy use. The U.S. Department of Energy states that good insulation can save energy by keeping water hot for longer periods.
By following these guidelines, you enhance the efficiency and increase the lifespan of your electric direct water heater.
What Common Issues Might You Encounter with Electric Direct Water Heaters, and How Can You Fix Them?
Common issues that may occur with electric direct water heaters include problems with temperature control, leaks, electrical supply issues, mineral buildup, and unit inefficiency.
- Temperature control issues
- Leaks
- Electrical supply issues
- Mineral buildup
- Unit inefficiency
To further understand these common issues, we will explore each point in detail.
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Temperature Control Issues: Temperature control issues in electric direct water heaters occur when the thermostat malfunctions or is set incorrectly. A malfunctioning thermostat fails to maintain the desired water temperature, potentially resulting in scalding hot or lukewarm water. Regular maintenance and calibration of the thermostat can prevent these issues. For instance, a study by the Electric Heating Association in 2021 found that improperly set thermostats contribute to 22% of complaints regarding water temperature.
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Leaks: Leaks in electric direct water heaters can arise from a faulty pressure relief valve, loose connections, or corrosion in the tank. Water leaks can lead to property damage and mold growth. Aluminum and copper piping can become corroded over time, leading to leaks. A report from the Home Inspection Institute in 2020 indicated that about 30% of water heater issues reported by homeowners involved leaks. Regular inspection and maintenance can help detect signs of leaks early.
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Electrical Supply Issues: Electrical supply issues can cause water heaters to operate inefficiently or not at all. These problems may originate from faulty wiring, a blown fuse, or circuit breaker issues. According to the National Electrical Code (NEC), improper electrical connections can result in safety hazards. It is crucial to ensure that the electrical supply meets the specifications required for the unit. The NEC recommends that water heaters have a dedicated circuit to prevent overload.
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Mineral Buildup: Mineral buildup occurs when hard water contains high levels of calcium and magnesium. These minerals accumulate in the tank and heating elements, leading to reduced efficiency and potential damage. The U.S. Geological Survey reports that nearly 85% of water in the United States is considered hard. Regular flushing of the tank can help remove mineral deposits, prolonging the heater’s lifespan. A 2019 study by the Water Research Foundation noted that homes with hard water experience nearly twice the mineral-related issues compared to those with soft water.
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Unit Inefficiency: Unit inefficiency may result from age, poor insulation, or design flaws. Older units tend to consume more energy to heat water, leading to higher utility bills. According to the U.S. Department of Energy, water heating can account for approximately 18% of a home’s energy costs. Energy Star-certified models enhance efficiency significantly. Upgrading to a more efficient model can yield significant long-term savings and reduce environmental impact.