If you’re looking for the best electric tankless heaters for 2026, I recommend considering options like the 18kW units that offer 4.17 GPM, or the Rheem RTEX-24 with adjustable temperature controls and no venting needed. The Westinghouse WiFi models make it easy to control remotely, while compact units suit small spaces. Each offers advanced safety features and high efficiency. Keep exploring further to find the perfect match for your hot water needs and installation setup.
Key Takeaways
- The list features top-rated electric tankless heaters suitable for various household sizes and hot water demands in 2026.
- It highlights units with advanced temperature control, WiFi connectivity, and safety features for reliable performance.
- The heaters vary in power (11kW to 27kW) to accommodate different installation requirements and flow rates.
- Compact, space-saving designs make these models ideal for small spaces, apartments, or point-of-use applications.
- Certifications like UL or ETL ensure the heaters meet safety standards for long-term, secure operation.
More Details on Our Top Picks
18kW Tankless Electric Water Heater 4.17 GPM
If you’re looking for an efficient and space-saving solution to meet your household hot water needs, the 18kW tankless electric water heater with a 4.17 GPM flow rate is an excellent choice. It’s designed for indoor use, fitting easily into tight spaces with dimensions of just 17 x 13 x 3.9 inches. It supplies hot water to 2-3 fixtures simultaneously, providing instant, stable temperatures thanks to its advanced chip that adjusts heating 20,000 times per second. With high energy efficiency, safety features, and a user-friendly LED display, this heater combines performance and convenience—making it perfect for modern homes.
- Power Rating:18kW
- Flow Rate (GPM):4.17 GPM
- Voltage:240V
- Control Type:Digital LED display
- Safety Certifications:ETL
- Installation Type:Indoor wall-mount
- Additional Feature:Compact space-saving design
- Additional Feature:Precise temperature adjustment
- Additional Feature:Built-in safety protections
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater Gray
The Rheem RTEX-24 24kW 240V Electric Tankless Water Heater stands out for those seeking a compact, space-saving solution that requires no venting. Its sleek gray design fits easily into tight spaces, making it ideal for whole-home hot water needs. It demands a 200 AMP service and three 40 AMP double pole breakers, so verify your electrical panel can handle it. With adjustable temperature control from 80°F to 140°F via a digital display, it offers precise comfort. Energy-efficient and easy to install, this heater provides continuous hot water without the hassle of venting, making it a versatile choice for many households.
- Power Rating:24kW
- Flow Rate (GPM):Not specified (suitable for whole home)
- Voltage:240V
- Control Type:Digital with dial
- Safety Certifications:ETL
- Installation Type:Indoor wall-mount
- Additional Feature:Digital temperature display
- Additional Feature:No venting needed
- Additional Feature:Suitable for whole-home use
ThermoMate Tankless Electric Water Heater 14kW ETL
For those seeking a compact, energy-efficient solution for small-scale hot water needs, the ThermoMate 14kW Electric Tankless Water Heater stands out. It provides continuous, on-demand hot water for up to two faucets and a shower, with a flow rate of 2.66 GPM at a 35°F temperature rise. Its cast aluminum heating chamber and self-modulating technology guarantee high efficiency—up to 99%—and reduce energy costs by up to 60%. Designed for small spaces, it’s wall-mountable, requires a 240V power supply, and features adjustable temperature control from 86°F to 131°F. Safe, durable, and low-maintenance, it’s ideal for point-of-use applications like bathrooms or small sinks.
- Power Rating:14kW
- Flow Rate (GPM):2.66 GPM
- Voltage:240V
- Control Type:Digital with knob
- Safety Certifications:ETL
- Installation Type:Wall-mount
- Additional Feature:Leak-proof construction
- Additional Feature:Self-modulating technology
- Additional Feature:Supports small spaces
Westinghouse 14kW WiFi Tankless Water Heater
The Westinghouse 14kW WiFi Tankless Water Heater stands out as an excellent choice for those seeking reliable, instant hot water with smart control features. Compact and wall-mounted, it measures just 14.2 inches high and 9.5 inches wide, fitting easily into apartments or small spaces. It delivers up to 3.38 GPM and heats water up to 140°F, perfect for multiple fixtures simultaneously. Its WiFi capability allows remote temperature adjustments via app or voice commands with Alexa and Google Home. Built with safety in mind, it includes leak, overheat, and dry-fire protection, ensuring durability and low maintenance over time.
- Power Rating:14kW
- Flow Rate (GPM):3.38 GPM
- Voltage:240V
- Control Type:WiFi app + digital display
- Safety Certifications:ETL, IPX4 waterproof
- Installation Type:Wall-mount
- Additional Feature:WiFi remote control
- Additional Feature:Real-time water temp display
- Additional Feature:4-layer safety protection
Rheem 11kW 240V Tankless Electric Water Heater
If you’re looking for a reliable electric tankless heater that delivers consistent hot water on demand, the Rheem 11kW 240V model stands out. It features an easy-to-use ON/OFF dial and an adjustable digital temperature display, giving you precise control over water temperature. Its self-modulating power control ensures efficient energy use, adapting to your hot water needs. With an 11kW power output and a flow rate of up to 2.68 GPM, it’s ideal for small to medium households. The side 1/2 NPT connections make installation straightforward. Designed for efficiency, it provides continuous hot water exactly when you need it without wasting energy.
- Power Rating:11kW
- Flow Rate (GPM):2.68 GPM
- Voltage:240V
- Control Type:Digital display + ON/OFF switch
- Safety Certifications:ETL
- Installation Type:Wall-mount
- Additional Feature:Adjustable digital display
- Additional Feature:On-demand hot water
- Additional Feature:Compact wall-mounted
Electric Tankless Water Heater with WiFi Control
A key feature that sets the Electric Tankless Water Heater with WiFi Control apart is its remote management capability, making it ideal for tech-savvy homeowners seeking convenience. With WiFi connectivity, you can easily adjust the temperature and monitor performance from anywhere using a smartphone. Its compact design saves space, fitting comfortably in tight areas, while providing a continuous hot water supply up to 6.5 GPM. The unit automatically regulates energy use, ensuring maximum efficiency and up to 99% savings compared to traditional heaters. Safety features like leakage, overheat, and dry-fire protection come standard, backed by ETL certification and a 2-year warranty.
- Power Rating:27kW
- Flow Rate (GPM):6.3 GPM
- Voltage:240V
- Control Type:Digital display + WiFi
- Safety Certifications:ETL
- Installation Type:Wall-mount
- Additional Feature:Space-efficient design
- Additional Feature:Self-regulating system
- Additional Feature:Multiple usage points
Westinghouse Apolo Mini Tankless Water Heater with WiFi
For anyone seeking instant hot water in small spaces, the Westinghouse Apolo Mini Tankless Water Heater with WiFi stands out due to its compact design and smart features. Measuring just 6.9×8.1×2.5 inches, it’s perfect for sinks and vanities, providing continuous hot water without preheating tanks. It’s easy to install with a dedicated 30A circuit and supports remote control via WiFi, compatible with Alexa and Google Home. You can adjust temperatures from 80°F to 130°F and restart the system remotely, offering convenience for busy kitchens. Its safety features, like anti-scald tech and waterproof rating, ensure reliable, secure operation in tight spaces.
- Power Rating:3.5kW
- Flow Rate (GPM):Not specified (sink/vanity use)
- Voltage:120V
- Control Type:WiFi + manual control
- Safety Certifications:ETL, smart protections
- Installation Type:Wall-mount
- Additional Feature:Smart WiFi control
- Additional Feature:Anti-scald technology
- Additional Feature:Compact for tight spaces
Rheem 18kW 240V Tankless Electric Water Heater Gray
The Rheem 18kW 240V Tankless Electric Water Heater stands out for its advanced self-modulation technology, which adjusts power output to meet your hot water demand efficiently. It features an external digital thermostat with an LED display that’s accurate within ±1 degree, giving you precise control. Installation is straightforward thanks to bottom 3/4 inch NPT water connections, and the unit’s compact design makes it versatile for various spaces. Its durable copper immersion heating elements are field serviceable, simplifying maintenance. With a flow rate up to 4.4 GPM, it ensures consistent hot water, combining reliability, efficiency, and ease of use.
- Power Rating:18kW
- Flow Rate (GPM):4.4 GPM
- Voltage:240V
- Control Type:Digital display + LED
- Safety Certifications:ETL
- Installation Type:Wall-mount
- Additional Feature:Digital LED display
- Additional Feature:Copper heating elements
- Additional Feature:Easy bottom connections
14kW Electric Tankless Water Heater with Digital Display
When selecting an electric tankless heater suitable for various household needs, a 14kW unit with a digital display stands out for its precise temperature control and efficient operation. This ORBEK model provides instant hot water for 2-3 points of use, with a flow rate of up to 3.38 GPM. Its high-definition LED display allows easy temperature adjustments from 86°F to 140°F, with real-time monitoring. Designed for space savings, it’s compact and easy to install, utilizing advanced water-electricity separation technology for up to 60% energy savings. Safety features like leakage protection and over-temperature shutoff ensure reliable, durable performance, making it a smart choice for modern households.
- Power Rating:14kW
- Flow Rate (GPM):3.38 GPM
- Voltage:240V
- Control Type:Digital LED display
- Safety Certifications:ETL
- Installation Type:Floor or wall mount
- Additional Feature:Rapid heating technology
- Additional Feature:ETL safety certified
- Additional Feature:Real-time temp monitoring
Ranein 13kW Tankless Electric Water Heater
If you’re looking for a reliable electric water heater that delivers instant hot water, the Ranein 13kW Tankless Electric Water Heater is an excellent choice. It operates at 240V and provides on-demand hot water with a flow rate of up to 3.1 GPM, comfortably supporting 1-2 shower points simultaneously. Its upgraded constant temperature control guarantees stable water temperature. The compact design (10.7″ x 7.9″ x 2.8″) makes it versatile for various setups, and the LED display simplifies temperature adjustments. Plus, safety features like overheat and leak protection, along with separation of water and electricity, make it safe and reliable for everyday use.
- Power Rating:13kW
- Flow Rate (GPM):3.1 GPM
- Voltage:240V
- Control Type:LED display + WiFi
- Safety Certifications:ETL
- Installation Type:Wall-mount
- Additional Feature:Upgraded temperature stability
- Additional Feature:LED smart display
- Additional Feature:Instant hot water
Fogatti 18kW Electric Tankless Water Heater
For those seeking reliable, on-demand hot water for multiple household points, the Fogatti 18kW Electric Tankless Water Heater stands out with its impressive 4.4 GPM flow rate and high efficiency of up to 98%. It’s designed to serve 2-3 points of use in a whole house, making it ideal for medium-sized households. Its compact size (17.1 x 12.9 x 3.9 inches) allows for easy installation in tight spaces. With advanced micro-adjustments, it maintains water temperature within ±1°F, ensuring consistent comfort. Safety features like overheating prevention and leak detection, combined with user-friendly controls, make it a reliable and efficient choice.
- Power Rating:18kW
- Flow Rate (GPM):4.4 GPM
- Voltage:240V
- Control Type:LED display + knob
- Safety Certifications:ETL
- Installation Type:Wall-mount
- Additional Feature:Advanced micro-adjustments
- Additional Feature:Overheat protection
- Additional Feature:Suitable for multiple outlets
MIZUDO 11kW Tankless Water Heater 2.6 GPM
The MIZUDO 11kW Tankless Water Heater stands out for small households needing reliable, on-demand hot water without taking up much space. Its compact design (14.2 x 9.5 x 2.8 inches) makes installation simple in tight spaces. Operating at 240V with a 50 AMP breaker, it delivers up to 2.6 GPM, perfect for 1-2 points of use. It heats water in about 3 seconds with 98% efficiency, considerably reducing energy costs. The LED display allows easy temperature adjustments from 86°F to 140°F. Certified by ETL and equipped with safety protections, it ensures safe, consistent performance for small household needs.
- Power Rating:27kW
- Flow Rate (GPM):6.5 GPM
- Voltage:240V
- Control Type:Digital with remote WiFi
- Safety Certifications:ETL
- Installation Type:Wall-mount
- Additional Feature:High energy efficiency
- Additional Feature:Leak and overheat protection
- Additional Feature:Compact wall-mount design
ThermoMate Tankless Electric Water Heater 27kW
The ThermoMate 27kW Electric Tankless Water Heater stands out for homeowners needing instant, high-capacity hot water, especially in larger households or busy homes with multiple fixtures. It provides continuous hot water at up to 5.27 GPM, with a digital temperature control from 80°F to 140°F. Its self-modulating technology ensures energy efficiency, achieving 99.8% efficiency and reducing heating costs by up to 60%. Compact and wall-mounted, it fits into tight spaces and offers safety features like overheating protection and leak prevention. Suitable for indoor use, this model requires specific electrical wiring and dedicated breakers, making it ideal for those seeking reliable, high-performance hot water.
- Power Rating:27kW
- Flow Rate (GPM):5.27 GPM
- Voltage:240V
- Control Type:Digital display + app control
- Safety Certifications:ETL
- Installation Type:Wall-mount
- Additional Feature:Overheating protection
- Additional Feature:Auto stop feature
- Additional Feature:Corrosion-resistant element
110V Electric Tankless Water Heater Compact Adjustable Temperature
If space is limited but reliable hot water is a priority, the V Electric Tankless Water Heater is an excellent choice thanks to its compact design. It offers a 3000W power output, providing efficient heating without taking up much room, making it perfect for under-sink installation. The adjustable temperature feature allows me to easily switch between Fahrenheit and Celsius, ensuring I monitor water temperature in my preferred units. Installation is straightforward with clear instructions, requiring a circuit breaker of at least 32AMP. Its energy-efficient, tankless operation reduces power consumption and saves on bills, making it an eco-friendly, cost-effective solution for small households or commercial use.
- Power Rating:3kW
- Flow Rate (GPM):Not specified (small applications)
- Voltage:110V
- Control Type:Basic control with temperature adjustment
- Safety Certifications:Not specified (assumed safety)
- Installation Type:Under sink, compact
- Additional Feature:Convertible temperature units
- Additional Feature:Quick and simple setup
- Additional Feature:Environmentally friendly
Tankless Electric Water Heater 27kW 6.5 GPM
For households seeking reliable, instant hot water with high flow capacity, the WINTEMP 27kW electric tankless heater stands out as an excellent choice. It delivers up to 6.5 GPM and heats water to 140°F quickly, providing continuous hot water without preheating or fluctuations. Its compact, wall-mounted design measures just 11.1” by 19.1” and weighs around 15 pounds. The self-regulating digital system adjusts power based on demand, saving up to 99% energy. With safety features like leakage, overheat, and dry-fire protections, plus ETL certification, it’s a smart, efficient solution for whole-house hot water needs.
- Power Rating:27kW
- Flow Rate (GPM):6.5 GPM
- Voltage:240V
- Control Type:Digital display + remote control
- Safety Certifications:ETL
- Installation Type:Wall-mount
- Additional Feature:Self-regulating technology
- Additional Feature:Suitable for 2-4 points
- Additional Feature:ETL certified safety
Factors to Consider When Choosing an Electric Tankless Heater
When selecting an electric tankless heater, I focus on power needs and capacity to guarantee it can handle my household’s hot water demands. I also consider flow rate compatibility, installation space, safety certifications, and temperature control features to make the best choice. These points help me find a unit that’s efficient, safe, and suited to my specific setup.
Power Requirements and Capacity
Choosing an electric tankless heater requires careful attention to its power requirements and capacity to guarantee it can meet your household’s hot water needs. First, confirm the heater’s wattage aligns with your demand, typically between 11kW and 27kW for homes. Check if your electrical system can support the necessary circuit breaker size, usually between 30A and 60A or more. Calculate the flow rate your fixtures require to select a heater with enough GPM capacity to handle simultaneous usage. Also, verify that the voltage (commonly 240V) matches your home’s electrical supply for proper operation. Finally, consider models with self-modulating technology, which adjusts power based on flow and temperature needs, ensuring efficient performance while preventing unnecessary energy consumption.
Flow Rate Compatibility
To guarantee your electric tankless heater can meet your household’s hot water demands, it’s essential to match its maximum flow rate with the combined GPM needs of all fixtures you plan to use simultaneously. Start by adding up the flow rates of your showers, sinks, and appliances to find your total GPM requirement. Remember, colder groundwater temperatures mean you’ll need a higher flow rate to reach your desired hot water temperature. Choose a heater with a flow rate capacity that meets or exceeds this total, ensuring consistent performance even under maximum load. Also, verify that the heater maintains stable temperatures under full flow conditions. By considering these factors, you can select a model that reliably supplies hot water without fluctuations or shortages.
Space and Installation
Selecting the right electric tankless heater requires careful consideration of your space and installation setup. First, measure your available space to confirm the unit fits comfortably; models range from compact 6-inch units to over 17 inches tall. Next, verify your installation area supports water and electrical connections, such as 3/4 inch NPT pipes and appropriate breaker sizes like 40A, 50A, or 60A. Check that the wall or surface can handle the unit’s weight and provides proper ventilation if needed. You may also need to contemplate electrical wiring or circuit upgrades, especially for units requiring 11kW to 27kW. Finally, ensure there’s enough clearance for maintenance and that your setup complies with local building codes and safety standards.
Safety Certifications Needed
Ensuring your electric tankless heater has the proper safety certifications is essential for safe and reliable operation. Look for models that are ETL or UL listed, as these certifications confirm the heater meets recognized safety standards. These certifications indicate that the device has undergone rigorous testing for electrical safety, which helps reduce the risk of fire or electric shock. Additionally, consider heaters with extra safety features such as leakage protection, over-temperature shutoff, and dry-heating protection. Certified units typically come with clear documentation of compliance, giving you peace of mind about their safety and long-term performance. Choosing a heater with proper safety certifications not only safeguards your home but also ensures dependable operation over time.
Temperature Control Features
When choosing an electric tankless heater, the ability to control water temperature accurately can make a big difference in comfort and safety. Many models feature digital displays and adjustable dials, letting you set temperatures within ranges like 86°F to 140°F. Advanced units use microprocessor-based chips that make thousands of micro-adjustments per second, ensuring stable water temps despite fluctuating flow or inlet temperature changes. Adjustable settings help prevent scalding, allowing you to fine-tune water to your preferred comfort level in 1°F increments. Some heaters even include real-time temperature monitoring, providing immediate feedback and precise control during use. For added convenience, certain models offer remote or app-based controls, so you can adjust settings and monitor performance remotely for ideal safety and comfort.
Frequently Asked Questions
How Do I Install an Electric Tankless Water Heater Safely?
To install an electric tankless water heater safely, I start by turning off the main power supply. Then, I carefully follow the manufacturer’s instructions, ensuring proper wiring and grounding. I check the circuit breaker capacity to handle the unit’s load. If I’m unsure about electrical work, I hire a licensed electrician. Always wear safety gear and double-check connections before turning the power back on for safe operation.
What Maintenance Is Required for Electric Tankless Heaters?
Think of your electric tankless heater as a garden that needs regular pruning and watering. I check the filters monthly for debris, flush the system annually to prevent mineral buildup, and guarantee the electrical connections stay tight. Just like tending a garden keeps it healthy, these simple maintenance steps keep my heater running efficiently, saving me money and avoiding unexpected breakdowns. Regular care truly makes a difference.
Can Electric Tankless Heaters Supply Hot Water for Multiple Fixtures?
Yes, electric tankless heaters can supply hot water to multiple fixtures, but it is important to take into account their flow rate capacity. I recommend choosing a unit with a high enough flow rate for your household needs. When multiple fixtures run simultaneously, the heater’s capacity might limit hot water availability. I always advise checking the specifications to ensure your selected heater can handle your household’s demand efficiently.
How Does Water Hardness Affect Heater Performance?
Imagine your heater as a busy artist, tirelessly working to keep your water flowing smoothly. Water hardness is like stubborn paintbrush bristles, stubbornly leaving mineral deposits on the heater’s interior. Hard water can clog the system, reduce efficiency, and cause it to work harder. Regular maintenance and water softening help keep your heater performing like a well-oiled machine, ensuring you get hot water without interruption.
Are There Energy-Saving Features in Modern Electric Tankless Heaters?
Yes, modern electric tankless heaters come with energy-saving features like advanced digital thermostats, auto shut-off when not in use, and eco-mode settings that optimize power consumption. I find these features help reduce energy bills and environmental impact. Plus, some models include smart controls allowing you to customize usage schedules. These innovations make it easier to enjoy hot water efficiently while saving money and conserving energy.
Conclusion
Choosing the right electric tankless heater is like finding the perfect key to open endless hot water comfort. With so many options, you’ll want one that fits your needs and lifestyle seamlessly. Think of it as planting a seed that will grow into a reliable, warm oasis for years to come. Trust your instincts, consider the factors, and you’ll soon enjoy a steady stream of comfort that flows as smoothly as a gentle river.
