If you’re after the best electric tankless water heaters for instant hot water in 2025, I recommend models like Rheem’s 18kW and 24kW units, EcoSmart ECO 11, WINTEMP’s 27kW, and Fogatti’s 18kW. These offer fast heating, precise control, and space-saving designs ideal for small to medium homes. Keep in mind their electrical requirements and flow rates. To discover more options and tips for selecting the right one, just continue exploring this guide.
Key Takeaways
- Top models offer rapid hot water delivery with high flow rates suitable for multiple fixtures.
- Many units feature advanced digital controls, WiFi connectivity, and voice control for convenience.
- Compact, space-saving designs make these heaters ideal for small spaces and point-of-use applications.
- Energy-efficient technologies, including self-modulation and up to 99% efficiency, reduce utility costs.
- Installation may require significant electrical upgrades, so professional setup is recommended for safety and performance.
Rheem 18kW 240V Tankless Electric Water Heater, Gray
If you’re looking for a reliable and efficient electric tankless water heater, the Rheem 18kW 240V model is an excellent choice. I appreciate its durable copper immersion heating elements, which are field serviceable, ensuring easy maintenance. With a flow rate of up to 4.4 GPM, it provides plenty of hot water for your needs. The external digital thermostat and LED display let me precisely control and monitor the temperature, with ±1 degree accuracy. Its self-modulation technology adjusts power output to match demand, boosting efficiency. Installation is straightforward with bottom 3/4 inch NPT water connections, making it a durable, user-friendly option for reliable hot water.
Best For: homeowners or small businesses seeking an efficient, durable, and easily maintainable electric tankless water heater for consistent hot water supply.
Pros:
- Durable copper immersion heating elements that are field serviceable for easy maintenance
- Precise temperature control with external digital thermostat and LED display (+/- 1 degree accuracy)
- Self-modulation technology enhances energy efficiency by adjusting power output to demand
Cons:
- Limited flow rate of up to 4.4 GPM may not meet high-demand household needs
- Requires a 240V power supply, which might necessitate electrical upgrades in some installations
- Installation involves bottom 3/4 inch NPT connections, which may require additional adapters or fittings
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
The Rheem RTEX-24 24kW 240V Electric Tankless Water Heater stands out as an excellent choice for homeowners who need reliable, on-demand hot water for multiple applications. With a flow rate of 5.9 GPM, it’s suitable for single or multiple outlets. Its compact design, up to 93% smaller than traditional units, saves space while delivering 99.8% efficiency. Easy to install, it’s wall-mounted and features an LED display for precise temperature control from 80°F to 140°F. Built with durable stainless steel, it requires a 200 AMP service and three 40 AMP double pole breakers, making it ideal for indoor use.
Best For: homeowners needing reliable, space-saving, on-demand hot water for multiple outlets or applications indoors.
Pros:
- High flow rate of 5.9 GPM suitable for various household needs
- Compact design up to 93% smaller than traditional units, saving space
- Energy-efficient operation with 99.8% efficiency and no standby heat loss
Cons:
- Requires a substantial electrical setup, including three 40 AMP double pole breakers and a 200 AMP service
- Installation is limited to indoor environments; not suitable for outdoor use
- May have performance variations based on groundwater temperature and regional factors
EcoSmart ECO 11 Electric Tankless Water Heater
The EcoSmart ECO 11 electric tankless water heater stands out as an ideal choice for small spaces and low-flow applications, thanks to its compact size and energy-efficient design. At just 11.5 x 8 x 3.75 inches, it’s 90% smaller than traditional tank heaters and can be wall-mounted or installed at the point of use. It delivers continuous hot water, adjusting energy use with patented self-modulating technology. With a maximum flow rate of 3.1 GPM and a temperature range of 80-140°F, it’s perfect for bathrooms, sinks, or office breakrooms, especially in warmer climates where it supports one shower or a combination of fixtures.
Best For: small households or commercial spaces seeking energy-efficient, on-demand hot water for low-flow fixtures in warm climates.
Pros:
- Compact size saves space and allows versatile installation options
- Energy-efficient self-modulating technology reduces power consumption
- Continuous hot water supply with precise temperature control up to 140°F
Cons:
- Limited flow rate of 3.1 GPM may not support multiple fixtures simultaneously in colder climates
- Requires adequate electrical capacity (240V, 54A) for installation
- Less suitable for high-demand situations or larger households
14kW Tankless Electric Water Heater ORBEK 240V, On-Demand Instant Hot Water Heater
For those seeking a compact, energy-efficient solution for multiple points of use, the ORBEK 14kW 240V tankless electric water heater stands out. It delivers instant, endless hot water within 3 seconds, supporting up to 3.38 GPM for 2-3 points simultaneously. Its LED digital display makes temperature adjustments simple, and its ETL certification guarantees safety. The unit requires a 240V/60AMP breaker, a set of 6 AWG wires, and standard water connections. Its small size (14.2 x 9.5 x 3.1 inches) saves over 50% space compared to traditional tank heaters, making installation straightforward and efficient.
Best For: homeowners or small businesses seeking a compact, energy-efficient, on-demand hot water solution for multiple points of use.
Pros:
- Provides instant, endless hot water within 3 seconds for up to 3 points simultaneously
- Compact size saves over 50% space compared to traditional tank heaters, simplifying installation
- High energy efficiency can reduce electricity costs by up to 60% and features advanced safety protections
Cons:
- Requires a dedicated 240V/60AMP breaker and specific wiring, potentially increasing installation complexity
- Limited to a maximum flow rate of 3.38 GPM, which may not meet high-demand applications
- May require professional installation to ensure proper electrical and water connections
Electric Tankless Water Heater WINTEMP 27kW 240V
If you’re looking to supply hot water for multiple household points without delays, the WINTEMP 27kW 240V electric tankless water heater is an excellent choice. It offers instant, endless hot water with an easy-to-read LED display and WiFi control for remote adjustments. Certified ETL for safety and quality, it delivers up to 6.5 gallons per minute, perfect for showers and multiple fixtures. Its self-regulating technology ensures energy efficiency—saving up to 99%—and it’s compact enough to fit in tight spaces. With built-in safety features and a 2-year warranty, it’s a reliable, high-performance solution for whole-house hot water needs.
Best For: households seeking an energy-efficient, space-saving hot water solution capable of providing instant, continuous hot water to multiple fixtures with remote control convenience.
Pros:
- Provides instant, endless hot water with a maximum flow rate of 6.5 GPM, suitable for multiple household fixtures.
- Energy-efficient self-regulating technology saves up to 99% on energy costs and eliminates standby energy waste.
- Compact, wall-mounted design saves space and is easy to install in tight areas while offering WiFi control for remote temperature adjustments.
Cons:
- Requires substantial electrical capacity (3 x 40 Amp breakers, 8/2 AWG wiring), which may necessitate electrical upgrades in some homes.
- Installation might require professional help due to high amperage and specific wiring requirements.
- The maximum hot water output may be insufficient for very large households with numerous simultaneous hot water demands.
18kW Tankless Water Heater Electric (ORBEK)
When selecting an electric tankless water heater, the ORBEK 18kW model stands out for homes needing reliable, instant hot water with space-saving design. It delivers up to 4.17 GPM, enough for 2-3 fixtures at once. Its compact size—17 inches high, 13 inches long, and just 3.9 inches wide—saves over 50% of space compared to traditional tanks. It heats water within 3 seconds and maintains a stable temperature with precision, adjustable from 86°F to 140°F. Certified by ETL, it features advanced safety measures, LED controls, and energy efficiency, reducing costs by up to 60%. It’s an excellent choice for modern, space-conscious homes.
Best For: homeowners seeking a space-saving, reliable electric tankless water heater with precise temperature control and energy efficiency.
Pros:
- Compact design saves over 50% space compared to traditional tank heaters.
- Provides instant hot water within 3 seconds and maintains stable temperature with high precision.
- ETL certified with advanced safety features and energy savings of up to 60%.
Cons:
- Requires dedicated 240V/40A electrical circuit and specific wiring, which may need professional installation.
- Capable of supporting only 2-3 fixtures simultaneously, limiting larger household applications.
- May have higher upfront costs compared to traditional tank water heaters.
Stiebel Eltron Tempra 29 Plus Tankless Water Heater
The Stiebel Eltron Tempra 29 Plus stands out as an excellent choice for households seeking reliable, on-demand hot water without the bulk of traditional tanks. This German-engineered unit offers continuous hot water for up to three showers in warm climates or two to three bathrooms in colder regions, thanks to its self-modulating technology that adjusts energy use for efficiency. It’s compact, easy to install, and requires no venting. With a 99% efficiency rating and advanced temperature control, it delivers consistent, unlimited hot water while saving up to 34% on water heating costs. It’s a smart, space-saving solution for modern homes.
Best For: households seeking reliable, energy-efficient on-demand hot water with space-saving installation and consistent temperature control.
Pros:
- Provides unlimited hot water for multiple fixtures simultaneously, ideal for family households.
- Energy-efficient with up to 34% savings on water heating costs and 99% efficiency.
- Compact, ventless design allows easy installation in various settings without bulky tanks.
Cons:
- Requires dedicated 40-amp circuit and specific wiring, which may necessitate professional installation.
- Higher upfront cost compared to traditional tank models.
- Suitable flow rate may be limited in very high-demand situations or larger households.
14kW Tankless Water Heater Electric (SIVUATEK 240V)
The SIVUATEK 240V 14kW Tankless Water Heater stands out as an excellent choice for those seeking reliable, on-demand hot water for small to medium households or Point-of-Use applications. Its compact, wall-mounted design makes installation straightforward, with a max flow rate of 3.3 gallons per minute and precise temperature control from 86°F to 131°F. With up to 99% efficiency, it reduces energy costs considerably—up to 60% compared to traditional tanks. Safety features like leakage and overheating protection ensure dependable operation, while its durable build promises longevity. Perfect for quick hot water in kitchens or bathrooms, it’s an efficient, space-saving solution.
Best For: small to medium households or Point-of-Use applications seeking reliable, instant hot water with space-saving installation.
Pros:
- High thermal efficiency up to 99%, reducing energy costs by up to 60%
- Compact, wall-mounted design for easy installation in tight spaces
- Precise temperature control from 86°F to 131°F with safety features like leakage and overheating protection
Cons:
- Requires a dedicated 60-amp circuit breaker for installation
- Max flow rate of 3.3 GPM may limit simultaneous hot water usage for larger households
- First available date is May 23, 2025, which may affect immediate purchase needs
27kW Tankless Water Heater Electric, APUS 240V On Demand Instant Hot Water System
If you’re looking for a compact, energy-efficient solution that can handle multiple hot water demands simultaneously, the APUS 240V On Demand Instant Hot Water System is an excellent choice. With a powerful 27kW electric heating element, it delivers up to 6.5 GPM, perfect for 3-4 fixtures at once. Its space-saving design fits tight spaces, and the advanced cast aluminum element guarantees rapid, efficient heating. The LED display allows precise temperature control from 86°F to 140°F, while self-modulating technology optimizes energy use. Built-in safety features and durable materials make it reliable, eco-friendly, and cost-effective for your hot water needs.
Best For: households or small businesses needing an energy-efficient, space-saving water heating solution capable of simultaneous multiple hot water uses.
Pros:
- High capacity of up to 6.5 GPM suitable for 3-4 fixtures at once
- Compact size with space-saving design fits tight areas
- Advanced cast aluminum heating element for rapid, efficient heating
Cons:
- Requires 3×40A breakers for installation, which may need electrical upgrades
- Installation may be complex for DIY users without professional help
- Limited temperature range (86°F-140°F) may not suit all preferences or applications
Rheem 11kW 240V Tankless Electric Water Heater
For those seeking a reliable, on-demand hot water solution for small to medium applications, the Rheem 11kW 240V Tankless Electric Water Heater stands out. It features an easy-to-use ON/OFF dial, an adjustable digital temperature display, and self-modulating power control to optimize energy use. With an 11kW power rating and a flow rate up to 2.68 GPM, it provides continuous hot water whenever you need it. Its side 1/2 NPT water connections simplify installation, making it suitable for various settings. Overall, this model delivers consistent hot water performance, making it a practical choice for smaller households or localized hot water needs.
Best For: small to medium households or localized hot water needs seeking a reliable, on-demand electric water heating solution.
Pros:
- Easy-to-use ON/OFF dial and adjustable digital temperature display for convenient control
- Self-modulating power control optimizes energy use and efficiency
- Compact design with side 1/2 NPT water connections simplifies installation
Cons:
- Flow rate up to 2.68 GPM may not suffice for larger households or high-demand applications
- Limited to 11kW power, which might restrict performance in certain setups
- Requires 240V power supply, which may not be readily available in all locations
36kW Tankless Electric Water Heater, 240V, WiFi Control
A 36kW tankless electric water heater with 240V power and WiFi control offers an excellent solution for homeowners who want reliable, on-demand hot water with smart features. It delivers up to 8.7 GPM, ensuring multiple fixtures can be heated simultaneously. The unit’s compact, wall-mounted design saves space, making it ideal for tight areas. With LED temperature display and WiFi control, you can easily monitor and adjust settings remotely. It automatically regulates energy consumption for efficiency, consuming up to 99% less power when flow decreases. Certified by ETL for safety, it provides consistent hot water and peace of mind for residential use.
Best For: homeowners seeking a space-saving, energy-efficient tankless water heater with remote control capabilities for reliable, on-demand hot water.
Pros:
- Compact wall-mounted design saves significant space, ideal for tight areas
- WiFi control allows convenient remote temperature adjustments and monitoring
- Highly energy-efficient, reducing power consumption by up to 99% during low flow conditions
Cons:
- Requires a substantial electrical setup with 150A capacity and specific breaker and wiring requirements
- Installation may be complex and typically needs professional assistance
- Higher initial cost compared to traditional tank heaters
Westinghouse 14kW 240V Smart WiFi Tankless Water Heater
The Westinghouse 14kW 240V Smart WiFi Tankless Water Heater stands out as an excellent choice for those seeking convenient, remote-controlled hot water solutions. It provides continuous hot water for one shower plus a sink, with a maximum flow of 3.38 GPM and water heated up to 140°F. Its compact, wall-mounted design makes installation easy, and the smart WiFi feature allows control via app or voice commands with Alexa and Google Home. With safety certifications and multiple protection layers, it’s built for durability. Perfect for apartments or small homes, it combines convenience, efficiency, and modern tech in a sleek package.
Best For: individuals living in small apartments or homes who want a space-saving, remotely controllable hot water solution with easy installation and reliable safety features.
Pros:
- Provides continuous hot water for 1 shower and sink with a maximum flow of 3.38 GPM
- Smartphone app and voice control compatibility with Alexa and Google Home for remote operation
- Compact, wall-mounted design with multiple safety protections and corrosion-resistant materials for durability
Cons:
- Suitable for only 1-3 points of use; may not meet higher demand needs
- Requires a 60A breaker and 6 AWG wiring, which might need electrical upgrades during installation
- Limited to heating water up to 140°F, which may not be sufficient for all preferences
Electric Tankless Water Heater SIVUATEK 14kW, 240V
If you’re looking for a compact, easy-to-install electric tankless water heater for point-of-use applications, the SIVUATEK 14kW, 240V model stands out. Its sleek, wall-mounted design measures just 12.2W x 17.25H inches, making it perfect for small spaces. With 14kW power and a flow rate of up to 2.3 GPM, it delivers instant hot water up to 131°F. The self-modulating system guarantees stable temperature even with fluctuating flow, and the digital display makes adjustments simple. Certified by ETL and UL, it’s built for safety and durability—ideal for residential, commercial, or public use.
Best For: households or small commercial spaces seeking a compact, energy-efficient point-of-use electric water heater with easy installation and reliable hot water supply.
Pros:
- Compact wall-mounted design fits small spaces and allows for easy installation near hot water points.
- Self-modulating system ensures consistent water temperature despite flow fluctuations.
- Certifications from ETL and UL guarantee safety, durability, and reliable operation.
Cons:
- Limited maximum flow rate of 2.3 GPM may not support simultaneous multiple outlets.
- Indoor use only, restricting placement options in outdoor or unprotected environments.
- May require basic plumbing skills for installation and setup.
Titan Electric Tankless Water Heater
Designed for those seeking efficient and compact hot water solutions, the Titan Electric Tankless Water Heater model N-120 stands out with its impressive 99.5% energy efficiency and rapid dual heating chambers. Operating at 220 volts with up to 54 amps, it delivers on-demand hot water quickly and reliably. Its sleek indoor wall-mount design measures just 9.6 inches by 12 inches, weighing only 7.54 pounds. With a powerful 11,800-watt output, it’s perfect for small to medium applications. Customers praise its performance and energy savings, backed by long warranties. Overall, the Titan N-120 is a reliable, space-saving choice for instant hot water.
Best For: homeowners or small businesses seeking an energy-efficient, compact, and reliable on-demand hot water solution for indoor use.
Pros:
- High energy efficiency at 99.5% reduces utility costs
- Compact wall-mount design saves space and is easy to install indoors
- Rapid dual heating chambers provide quick hot water delivery
Cons:
- Requires 220V power supply and up to 54 amps, which may need dedicated wiring
- Not suitable for large households or high-demand applications
- No additional accessories or batteries included, so separate installation components may be needed
Fogatti 18kW Tankless Water Heater Electric
For homeowners seeking reliable, high-capacity hot water on demand, the Fogatti 18kW Tankless Water Heater Electric stands out as an excellent choice. It operates at 240 volts, supporting up to 4.4 GPM, making it suitable for 2-3 points of use or whole-house applications. Its compact size of just 17.1 x 12.9 x 3.9 inches allows flexible installation, saving over 50% space compared to traditional tank heaters. With up to 98% efficiency, it heats water instantly and maintains stable temperatures within ±1°F. Safety features, including leak detection and overheating prevention, combined with an intuitive LED display, make it a dependable, efficient option for modern homes.
Best For: homeowners needing reliable, high-capacity instant hot water for multiple points of use or whole-house applications with space-saving installation.
Pros:
- Supports up to 4.4 GPM flow rate, suitable for 2-3 points of use or whole-house needs
- Compact size (17.1 x 12.9 x 3.9 inches) allows flexible installation and space savings
- High efficiency up to 98% with precise temperature control within ±1°F
Cons:
- Requires two 40-amp double-pole circuit breakers and 8 AWG wiring for installation
- Maximum current draw of 75 amps necessitates proper electrical setup
- Installation may require professional assistance due to electrical and plumbing requirements
Factors to Consider When Choosing Electric Tankless Water Heaters
When choosing an electric tankless water heater, I focus on factors like power and flow rate to guarantee it meets my household’s hot water needs. I also consider size and space to find a model that fits comfortably and installation requirements that suit my setup. Finally, I look at temperature control features and energy efficiency ratings to save both energy and money.
Power and Flow Rate
Choosing the right electric tankless water heater depends heavily on its power and flow rate. Power, measured in kilowatts (kW), determines how much water the unit can heat at once and how quickly. Higher wattage means better performance, especially when multiple fixtures are used simultaneously. Flow rate, expressed in gallons per minute (GPM), indicates the maximum hot water supply at a given temperature rise. It’s essential to select a unit with a flow rate that matches your household’s peak demand, so you avoid running out of hot water or overloading your electrical system. Finding the right balance between power and flow rate ensures consistent hot water without wasting energy or stressing your home’s electrical capacity. This balance is key for peak performance and efficiency.
Size and Space Needs
Selecting the right size and guaranteeing proper space for your electric tankless water heater is crucial for smooth installation and peak performance. First, measure the available space, including height, width, and depth, to confirm the unit fits comfortably. If space is limited, opt for a compact model, as many units now occupy over 90% less space than traditional tank heaters. Consider mounting options—wall-mounted units can save valuable floor space and make installation easier in tight areas. Also, check the clearance around the heater for ventilation, maintenance, and safe operation, especially indoors. Finally, match the size of the heater to your household’s hot water demand, making sure it provides enough flow without overcrowding your designated area. Proper planning ensures efficiency and convenience.
Temperature Control Features
Optimizing your electric tankless water heater’s performance depends heavily on its temperature control features. I look for models with digital thermostatic controls that allow precise adjustments in 1°F increments, ensuring I get exactly the hot water temperature I need. An LED display is essential because it clearly shows the current water temperature, making monitoring straightforward. I prefer units with self-modulating technology, which automatically adjusts power output to maintain a consistent temperature even when flow rates fluctuate. It’s also important to verify the maximum temperature setting, typically ranging from 80°F to 140°F, to suit my household’s hot water demands. Ultimately, control systems with memory presets allow me to quickly select personalized temperatures, adding convenience and efficiency to daily use.
Installation Requirements
Before installing an electric tankless water heater, it’s essential to verify that your home’s electrical system can support the unit’s requirements. Check that your electrical panel can handle the voltage, amperage, and circuit breaker specifications, such as 240V and 40-amp double-pole breakers for units like 14kW models. Confirm your wiring meets the necessary gauge—typically 8 AWG or 6 AWG—to safely support the heater’s power load. Make sure your plumbing connections are compatible, usually 1/2 or 3/4 NPT fittings. Also, consider available space and mounting options for wall-mounted units, ensuring proper clearance and ventilation if needed. Ultimately, review manufacturer instructions and local electrical codes to ensure a safe, compliant installation.
Energy Efficiency Ratings
Energy efficiency ratings are a key factor when choosing an electric tankless water heater because they directly impact your long-term energy costs. Units with efficiency ratings of 99% or higher help minimize energy waste, saving you money on utility bills. Many models feature self-modulating technology, which adjusts power use based on demand, further improving efficiency. An efficient heater also reduces standby heat loss, ensuring energy is only used when hot water is needed. Certifications like CSA, UL, or Watersense serve as indicators of high efficiency and safety compliance. By prioritizing these ratings and certifications, you can select a heater that not only provides instant hot water but also keeps operational costs low over time, making your investment more cost-effective.
Safety and Certification
When selecting an electric tankless water heater, safety and certification should be top priorities. I recommend choosing units certified by recognized organizations like UL, ETL, or CSA, as these confirm the product meets strict safety standards. Look for built-in safety features such as leakage protection, over-temperature shutoff, and dry-fire prevention to minimize risks. Proper water-electricity separation is essential to reduce electrical shock and corrosion, ensuring long-term safety. Additionally, verify that the heater has undergone rigorous testing for durability, safety, and reliable operation across various environments. Finally, make sure the unit complies with regional electrical codes and standards. Prioritizing these factors helps ensure you select a safe, reliable, and compliant electric tankless water heater for your home.
Frequently Asked Questions
How Do Electric Tankless Water Heaters Perform in Cold Climates?
Electric tankless water heaters can struggle in cold climates because incoming water temperatures are lower, which means they need to work harder to heat water to your desired temperature. I’ve found that in these areas, choosing models with higher flow rates and better heating capacity helps maintain hot water supply. Insulating pipes and installing the heater indoors also improves performance, ensuring you get hot water even during the coldest months.
What Are the Maintenance Requirements for Electric Tankless Water Heaters?
Maintaining an electric tankless water heater is pretty straightforward. I regularly flush the system to remove mineral buildup, especially if you have hard water. I also check the filter periodically and make sure the electrical connections are secure. It’s important to keep an eye on error codes and perform annual inspections to catch any issues early. Proper maintenance keeps my water heater running efficiently and extends its lifespan.
Can Electric Tankless Water Heaters Be Used for Whole-House Heating?
Absolutely, electric tankless water heaters can be used for whole-house heating, but it’s like trying to power a marathon with a sprinting shoe—they work best for small-scale needs. I recommend them for supplemental heating or in well-insulated spaces. For entire homes, you’d need a high-capacity model and possibly a backup system. Always consult a professional to guarantee safety and efficiency before making such a big switch.
How Does Water Flow Rate Affect Hot Water Availability?
Water flow rate directly impacts hot water availability because it determines how much hot water can be delivered at once. When flow rate is high, the heater needs to work harder to keep up, which might reduce hot water pressure or temperature if the heater isn’t rated for that volume. I always consider flow rate carefully to guarantee I get enough hot water without sacrificing performance, especially for larger households.
Are There Any Safety Features Specific to Electric Tankless Models?
Like a vigilant guardian, electric tankless water heaters come with safety features that protect you. They often include automatic shut-off if overheating occurs, preventing fires or damage. Many models also have thermal cut-off switches and leak detection sensors that alert you to issues before they escalate. These safety measures work silently in the background, giving you peace of mind while providing instant hot water whenever you need it.
Conclusion
Choosing the right electric tankless water heater is like finding the perfect key to unlock instant comfort. With so many options, you’ll want one that fits your needs like a glove—powerful, reliable, and efficient. Remember, a great heater is the heartbeat of your home’s comfort system, turning cold water into a warm embrace whenever you need it. Explore your search confident, knowing the perfect match is out there just waiting to warm your days.
