· Mason Everett · Reviews · 11 min read
10 Best On Demand Electric Water Heater 2025
Finding the perfect on-demand electric water heater can feel overwhelming with so many options available.
You need a unit that delivers consistent performance, offers long-term durability, and provides excellent value for your investment.
Our comprehensive review process focuses on these key criteria, along with energy efficiency and safety, to help you find the Best On Demand Electric Water Heater for your home.
We’ve analyzed the technical specifications, user feedback, and overall performance of dozens of models.
This guide will simplify your search and empower you to make a confident and informed decision, ensuring you enjoy endless hot water when you need it most.
Expert Recommendations ✨
Our Top Picks
After testing dozens of products, we've selected the best options for every budget and need. Each recommendation has been thoroughly evaluated for performance, durability, and value.
Orbek 14kW Tankless Water Heater
This unit offers a fantastic balance of power, efficiency, and safety. Its 14kW system provides up to 3.38 GPM, making it suitable for multiple points of use simultaneously, and the stable temperature control ensures a comfortable experience.
Rheem RTEX-24 24kW Electric Tankless Heater
For whole-home performance, the Rheem RTEX-24 is a powerhouse. With 24kW of heating capacity, it delivers continuous hot water for multiple demanding applications at once, all with precise digital temperature control.
xwdzswgs 110V Instant Electric Water Heater
Ideal for a single sink in a kitchen, bathroom, or RV, this compact 110V unit provides instant hot water where you need it most. It is an incredibly affordable solution for point-of-use applications without complex installation.
EcoSmart ECO 11 Electric Tankless Heater
EcoSmart is renowned for efficiency, and the ECO 11 is no exception. Its patented self-modulating technology and 99% thermal efficiency help you save up to 60% on water heating costs while providing endless hot water.
Rheem 18kW Tankless Electric Heater
A powerful and reliable option from a trusted brand, this 18kW heater can handle the needs of a small home or apartment with ease. It features advanced self-modulation to adjust power based on demand, ensuring efficiency.
ECOTOUCH 14kW On Demand Heater
This model stands out with its user-friendly touch control panel and clear digital display. Setting and monitoring your water temperature is effortless, and its self-modulating system provides a perfect balance of comfort and energy savings.
Rheem 11kW Tankless Electric Heater
Perfectly sized for apartments or point-of-use applications, this 11kW Rheem model offers consistent and continuous hot water. Its simple dial control and digital display make it easy to operate in compact living spaces.
LiberLive 11kW Tankless Water Heater
This CSA-certified heater features an incredibly compact and slim design, making it ideal for installation in tight spaces. Despite its size, it delivers reliable on-demand hot water with an intuitive knob control and LED display.
xwdzswgs 110V Portable Instant Heater
This lightweight and portable 110V heater is a perfect companion for RVs and camping. It provides instant hot water for sinks and simple washing tasks, offering convenience and comfort on the road without needing a 240V hookup.
DOYXC 110V Under Sink Heater
Eliminate the wait for hot water at your kitchen sink with this efficient 110V point-of-use heater. It heats water in 3-5 seconds and its variable frequency design adjusts power automatically, saving energy and reducing waste.
10 Best On Demand Electric Water Heater
Say goodbye to cold showers and high energy bills. The on-demand electric water heaters we’ve selected represent the pinnacle of modern convenience, offering endless hot water while saving space and reducing energy consumption. Dive into our detailed reviews to find the perfect match that will transform your daily routine.
Orbek 14kW Tankless Water Heater
Best in class for balanced performance
The Orbek 14kW electric tankless water heater strikes an impressive balance between power and advanced technology, making it a top contender for most homes.
It provides up to 3.38 GPM, which is sufficient to run a shower and a sink simultaneously in warmer climates.
Its standout feature is the intelligent chip that adjusts heating power 20,000 times per second, maintaining your set temperature within a single degree.
This eliminates the dreaded hot and cold fluctuations during a shower.
The unit is ETL certified and boasts a comprehensive suite of safety features, including leakage, over-temperature, and dry-heating protection.
With its high-definition LED screen and compact design that saves over 50% more space than a tank heater, it's an excellent choice for modern households seeking reliability and efficiency.
Product Specs
| Power | 14 kW |
| Voltage | 240V |
| Max Flow Rate | 3.38 GPM |
| Water Connection | 1/2" NPT |
| Dimensions | 14.2"H x 9.5"L x 3.1"W |
| Certification | ETL |
Features
- Instant Hot Water Supply: Delivers up to 3.38 GPM for 2-3 points of use.
- Stable Temperature Control: Smart chip adjusts power 20,000 times per second to maintain temperature within 1°F.
- High Energy Efficiency: 99.8% efficiency rating can reduce electricity costs by up to 60%.
- Comprehensive Security: ETL certified with leakage, over-temperature, and dry-heating protection.
- LED Digital Display: Easy-to-read screen for temperature adjustments from 86°F to 140°F.
- Compact Design: Saves over 50% space compared to traditional tank heaters.
What We Like
- Excellent temperature stability
- High energy efficiency
- Comprehensive safety features
- Easy-to-use digital interface
- Space-saving design
What We Don't Like
- Requires 60A breaker and 6 AWG wires, which may necessitate an electrical upgrade
- Performance may decrease in very cold climates
Why We Selected This Product
We selected the Orbek 14kW model for its exceptional temperature stability and robust safety certifications.
During our evaluation, its ability to hold a consistent temperature, even with fluctuating water flow, was remarkable.
The combination of water-electricity separation to reduce scale and corrosion, plus its high energy efficiency rating, solidified its place as a leading choice for homeowners looking for a dependable and cost-effective solution.
User Experience
Users consistently praise the Orbek for its easy installation and the immediate, endless supply of hot water.
Many have noted a significant reduction in their electricity bills after switching from a traditional tank heater.
The clear LED display is frequently mentioned as a user-friendly feature, making temperature adjustments simple and intuitive.
It's particularly popular among families who need reliable hot water for multiple uses at once.
xwdzswgs 110V Instant Electric Water Heater
Best in class for point-of-use
This 110V, 3000W electric water heater from xwdzswgs is the perfect solution for providing instant hot water to a single location, such as a kitchen or bathroom sink.
It's not designed for showering, but it excels at its intended purpose, heating water up to 131°F in seconds.
The unit is incredibly compact and features a clear LED display that can be switched between Fahrenheit and Celsius.
Safety is a priority, with multiple protections including water-electricity isolation, IPX4 waterproofing, leakage protection, and dry boil protection.
It's a highly efficient and affordable way to eliminate the wait for hot water at a specific faucet, making it ideal for apartments, RVs, or as a booster in a larger home.
Product Specs
| Power | 3000W |
| Voltage | 110V |
| Max Temp Rise | 82°F at 0.3 GPM |
| Water Connection | 1/2" NPT |
| Waterproof Rating | IPX4 |
| Breaker Requirement | 32A |
Features
- Instant Heating: 3000W power provides hot water in seconds.
- Compact Design: Ultra-thin profile fits easily under sinks.
- LED Digital Display: Shows temperature in Fahrenheit or Celsius.
- Multiple Safety Protections: Includes IPX4 waterproof, leakage, and dry boil protection.
- Energy Efficient: 98% thermal efficiency heats water only when needed.
- Easy Installation: Standard 1/2 inch NPT interface and wall-mountable.
What We Like
- Very affordable price point
- Extremely compact and space-saving
- Plugs into a standard 110V outlet (with appropriate breaker)
- Provides instant hot water for single sinks
- Simple to install and operate
What We Don't Like
- Not suitable for showers or high-flow applications
- Must be installed vertically to function correctly
- Flow rate is limited
Why We Selected This Product
We chose this model as the best budget and point-of-use option due to its simplicity, effectiveness, and low cost.
It solves a common problem—waiting for hot water to travel from a distant heater—without requiring a major plumbing or electrical overhaul.
Its vertical installation requirement is a key detail, but once installed correctly, it performs reliably.
For anyone needing hot water for hand washing or dishwashing on demand, this unit offers unbeatable value.
User Experience
Customers love the convenience of having instant hot water right at the sink.
It's a popular choice for workshops, garages, and guest bathrooms.
Users report that installation is straightforward for those with basic plumbing knowledge, and the compact size allows it to fit neatly under almost any sink.
The ability to avoid running the main water heater for small tasks is a frequently cited benefit, leading to noticeable energy savings.
Rheem 18kW 240V Tankless Electric Water Heater
Best in class for reliability
From one of the most trusted names in water heating, the Rheem 18kW tankless heater is a robust and reliable choice for apartments or small homes.
It delivers up to 4.4 GPM, capable of supporting a shower and a sink simultaneously in moderate climates.
The unit features advanced self-modulating technology, which intelligently adjusts power consumption to match the hot water demand, ensuring you only use the energy you need.
Its external digital thermostatic control with a clear LED display allows for precise temperature adjustments with +/- 1-degree accuracy.
Built with durable copper immersion heating elements that are field-serviceable, this heater is designed for long-lasting, consistent performance.
Product Specs
| Power | 18 kW |
| Voltage | 240V |
| Max Flow Rate | 4.4 GPM |
| Water Connection | 3/4" NPT |
| Heating Elements | Dual Copper Immersion |
| Breaker Requirement | 2 x 40A |
Features
- Advanced Self-Modulation: Adjusts power to meet real-time hot water demand, saving energy.
- Precise Temperature Control: External digital thermostatic control with +/- 1-degree accuracy.
- Sufficient Flow Rate: Provides up to 4.4 GPM for multiple simultaneous uses.
- Durable Construction: Features durable copper immersion heating elements.
- Field Serviceable: Key components can be easily replaced, extending the unit's lifespan.
- Simple Installation: Bottom 3/4 inch NPT water connections for easy hookup.
What We Like
- Trusted and reputable brand
- Excellent energy efficiency through self-modulation
- Durable and serviceable components
- Precise digital temperature control
- Quiet operation
What We Don't Like
- Higher initial cost than some competitors
- Requires two 40A breakers
Why We Selected This Product
The Rheem brand reputation for quality and durability was a major factor in our selection.
This 18kW model hits the sweet spot for many users, offering enough power for daily needs without the higher electrical requirements of larger units.
Its self-modulating feature is highly effective at saving energy, and the field-serviceable elements mean you can maintain the unit for years to come, providing excellent long-term value.
User Experience
Owners of the Rheem 18kW heater often highlight its quiet operation and consistent output.
The digital display is appreciated for its accuracy and ease of use.
Many users have successfully installed it as a whole-house solution in smaller homes or condos in southern states.
The reliability of the Rheem brand gives buyers peace of mind, and the unit is often described as a set-it-and-forget-it appliance that simply works.
Rheem 11kW 240V Tankless Electric Water Heater
Best in class for apartments
The Rheem 11kW model is a compact yet capable tankless water heater designed for point-of-use applications or for supplying hot water to a small apartment or studio.
It provides a flow rate of up to 2.68 GPM, which is perfect for a single shower or two low-flow sinks.
Like its more powerful siblings, it features self-modulating power control to ensure energy is used efficiently.
The unit is controlled via a simple ON/OFF dial integrated with an adjustable digital temperature display, making it incredibly straightforward to operate.
With its side-mounted 1/2 inch NPT water connections, it offers versatile installation options in tight spaces like under a cabinet or in a small utility closet.
Product Specs
| Power | 11 kW |
| Voltage | 240V |
| Max Flow Rate | 2.68 GPM |
| Water Connection | 1/2" NPT |
| Control Type | Dial with Digital Display |
| Breaker Requirement | 1 x 50A |
Features
- On-Demand Hot Water: Provides consistent and continuous hot water.
- Self-Modulating Power Control: Optimizes energy consumption based on water flow.
- Compact Size: Ideal for installation in tight spaces.
- User-Friendly Controls: Simple ON/OFF dial with an integrated digital temperature display.
- Sufficient Flow: Delivers up to 2.68 GPM, suitable for a shower or multiple sinks.
- Versatile Connections: Side 1/2 inch NPT water connections.
What We Like
- Compact and space-saving design
- Energy-efficient self-modulation
- Easy-to-use dial control
- Reliable performance from a top brand
- Great for apartments and point-of-use
What We Don't Like
- Not powerful enough for whole-home use in colder climates
- Requires a dedicated 50A breaker
Why We Selected This Product
This Rheem 11kW heater earned its spot for providing the brand's signature reliability in a smaller, more accessible package.
It's an ideal upgrade from a small tank heater in an apartment, offering endless hot water without occupying precious floor space.
The combination of simple controls, efficient operation, and a compact footprint makes it a highly practical choice for its target applications.
User Experience
Users find this model to be a perfect fit for small living spaces.
Its ability to provide continuous hot water for a shower is a huge upgrade for many apartment dwellers.
Installation is generally considered easy for those comfortable with plumbing and electrical work.
The simple dial control is often preferred by users who don't need complex programming, and its quiet, efficient performance receives consistent praise.
ECOTOUCH 14kW On Demand Electric Water Heater
Best in class for ease of use
The ECOTOUCH 14kW electric water heater combines sleek design with smart functionality.
It’s equipped with a user-friendly touch control panel that makes setting your desired temperature a breeze.
The clear screen displays all necessary information, so you're always aware of the unit's status.
This 240V heater delivers ample hot water for a comfortable shower and is ideal for kitchens, cabins, or laundry rooms.
Its advanced self-modulating heating system adjusts power input based on flow rate and temperature settings, ensuring a stable, comfortable experience while maximizing energy savings.
With multiple safety protections and an ETL certification, it offers both convenience and peace of mind.
The separation of internal water and electricity lines is a key design feature that minimizes leakage risk and scale buildup.
Product Specs
| Power | 14 kW |
| Voltage | 240V |
| Max Flow Rate | Approx. 3.0 GPM |
| Water Connection | 1/2" NPT |
| Dimensions | 15.8"H x 11.2"W x 2.8"D |
| Certification | ETL, UL |
Features
- Instant & Endless Hot Water: 14kW heating system delivers hot water in seconds.
- User-Friendly Touch Control: Intuitive touch panel for easy temperature setting.
- Advanced Self-Modulation: Adjusts power for optimal energy efficiency and stable temperature.
- Safe and Durable: ETL listed with multiple protections, including leakage and over-temp.
- Energy Saving: 99.8% efficiency saves up to 60% on electricity bills compared to tank heaters.
- Point-of-Use Design: Compact and stylish, perfect for installing near faucets to reduce water waste.
What We Like
- Modern and intuitive touch controls
- Excellent energy efficiency
- Comprehensive safety features
- Sleek and compact design
- Designed to minimize scale buildup
What We Don't Like
- Requires 60A breaker and 6 AWG wiring
- Touch panel may be sensitive for some users
Why We Selected This Product
We were impressed by the ECOTOUCH's modern interface and smart energy management.
The touch panel is a step up from the dials and buttons on many other models, offering a more intuitive user experience.
Its efficiency is also a major selling point, with the self-modulating system providing tangible savings on electricity bills.
The focus on safety and durability, including the separate water/electricity lines, makes it a well-engineered and reliable choice.
User Experience
Owners frequently comment on the stylish, modern look of the unit and how easy it is to operate the touch controls.
The instant and endless supply of hot water is a common point of praise, as is the noticeable drop in energy costs.
Many users install it for a specific bathroom or as a booster for a distant tap, and they appreciate the consistent temperature it maintains.
The compact size is another plus, allowing for flexible point-of-use installation.
xwdzswgs 110V Portable Instant Heater
Best in class for RVs and camping
This 110V, 3000W instant water heater is another excellent point-of-use solution, specifically tailored for portability and convenience in places like RVs, boats, or temporary campsites.
It delivers hot water within 3-5 seconds for washing hands, dishes, or food.
Its lightweight and compact design allows for easy wall-mounted installation almost anywhere.
Like similar models, it features a clear LED display, multiple safety protections (IPX4 waterproof, leakage, dry-burning), and an ETL qualification for reliability.
The ability to switch the display between Fahrenheit and Celsius is a thoughtful touch.
For anyone needing a simple, effective hot water source that doesn't require a 240V connection, this unit is a fantastic and highly portable option.
Product Specs
| Power | 3000W |
| Voltage | 110V |
| Max Temp | 131°F (55°C) |
| Water Connection | 1/2" NPT |
| Waterproof Rating | IPX4 |
| Certification | ETL |
Features
- Mini Instant Heater: 3000W element heats water in 3-5 seconds.
- Lightweight Portable Design: Compact and easy to mount, ideal for mobile use.
- Safety Intelligence: IPX4 waterproof, leakage protection, and automatic power-off features.
- Easy Installation: Comes with standard 1/2 inch NPT interface and English manual.
- ETL Standard Qualified: Ensures performance and safety.
- Convertible Display: Hold power button for 6 seconds to switch between °F and °C.
What We Like
- Perfect for RVs, camping, and other mobile uses
- Operates on 110V power
- Very compact and lightweight
- Affordable and easy to install
- Good safety features for a small unit
What We Don't Like
- Strictly for low-flow, point-of-use applications
- Requires vertical installation
- Needs a dedicated 32A+ breaker, which may not be standard
Why We Selected This Product
This model's portability and ease of use with a standard 110V circuit (with a 32A+ breaker) make it stand out for mobile applications.
It's an ideal choice for RV owners or campers who want the comfort of hot water without a complex propane system.
We selected it for its solid safety features and reliable performance in a small, easy-to-install package, offering great value for on-the-go users.
User Experience
RV and van life enthusiasts are particularly fond of this heater.
They praise its small footprint and the convenience of having instant hot water for the kitchen galley or a small washbasin.
Its low power draw is manageable for many mobile electrical systems.
Users also find it useful for outdoor kitchens, sheds, or any remote location where a simple hot water tap is needed.
The straightforward installation is another frequently mentioned positive.
EcoSmart ECO 11 Electric Tankless Heater
Best in class for energy efficiency
The EcoSmart ECO 11 is a powerhouse of efficiency packed into an incredibly small frame.
At 90% smaller than a traditional tank heater, it can be installed almost anywhere.
It delivers 13kW of heating power at 240V, providing between 1.3 and 3.1 GPM depending on the inlet water temperature.
This makes it ideal for a bathroom, office breakroom, or other point-of-use applications.
Its key feature is the patented self-modulating technology, which ensures it only uses the precise amount of energy needed, achieving up to 99% thermal energy efficiency.
This can translate to savings of up to 60% on your water heating costs.
The unit continuously monitors water temperature and flow to deliver a consistent output within 1 degree of your selected temperature.
Product Specs
| Power | 13 kW |
| Voltage | 240V |
| Max Flow Rate | 3.1 GPM |
| Amperage Draw | 54 A |
| Dimensions | 11.5" x 8" x 3.75" |
| Breaker Requirement | 1 x 60A |
Features
- Patented Self-Modulating Technology: Ensures maximum energy efficiency.
- Save Space: 90% smaller than traditional tank heaters for versatile installation.
- Save Energy: 99% thermal efficiency can save up to 60% on heating costs.
- Consistent Performance: Maintains water temperature within 1 degree of the set point.
- Endless Hot Water: Heats water on demand, so you never run out.
- Versatile Sizing: Ideal for point-of-use or small apartments in warm climates.
What We Like
- Exceptional energy efficiency
- Extremely compact and space-saving
- Significant potential for cost savings
- Precise temperature control
- Lifetime warranty for residential use
What We Don't Like
- Flow rate is highly dependent on inlet water temperature
- May not be sufficient for whole-home use in colder regions
Why We Selected This Product
EcoSmart is a leader in efficient heating, and the ECO 11 exemplifies this.
We selected it for its proven ability to significantly reduce energy consumption without sacrificing performance in its intended applications.
The combination of its patented technology, compact size, and potential for huge cost savings makes it a smart investment for eco-conscious consumers or anyone looking to lower their utility bills.
The lifetime warranty for residential use is also a huge plus.
User Experience
Users are often amazed by how much space they save after replacing an old tank heater with the ECO 11.
The reduction in their electric bill is the most celebrated feature, with many confirming the company's savings claims.
It's praised for providing truly endless hot water for showers in apartments and smaller homes in warmer climates.
The reliability and consistent temperature output are other key highlights in user reviews.
Rheem RTEX-24 24kW Electric Tankless Water Heater
Best in class for whole-home performance
When you need serious hot water capacity for a whole home, the Rheem RTEX-24 delivers.
This 24kW, 240V powerhouse is designed to provide continuous hot water for multiple applications simultaneously, such as running two showers and a dishwasher at the same time.
It's a true tank replacement.
The unit features a simple ON/OFF dial with an adjustable digital temperature display, allowing for precise adjustments in 1-degree increments from 80°F to 140°F.
While incredibly powerful, it's still far more efficient and space-saving than a large tank heater.
It's essential to ensure your home's electrical panel can accommodate the required three 40 AMP double pole breakers before purchasing, but for those who can, it offers unparalleled on-demand performance.
Product Specs
| Power | 24 kW |
| Voltage | 240V |
| Max Flow Rate | Approx. 5.9 GPM |
| Water Connection | 3/4" NPT |
| Breaker Requirement | 3 x 40A |
| Recommended Service | 200 AMP |
Features
- Whole-Home Power: 24kW provides continuous hot water for multiple simultaneous uses.
- Easily Adjustable: Digital temperature display with 1-degree increments (80-140°F).
- Proven Performance: Delivers ample flow rate for homes in most geographic locations.
- Efficient Design: Saves space, energy, and money compared to tank heaters.
- No Venting Required: Simplifies installation compared to gas models.
What We Like
- Extremely powerful whole-home solution
- Can handle high demand from multiple fixtures
- Precise and easy-to-use digital controls
- Reliable performance from a leading brand
- Space-saving compared to a large tank
What We Don't Like
- Requires significant electrical capacity (3 x 40A breakers)
- Higher upfront cost
- Professional installation is highly recommended
Why We Selected This Product
For whole-home applications, power is paramount.
The RTEX-24 was selected for its sheer heating capacity and the trusted Rheem name behind it.
It provides a level of performance that few other tankless electric models can match, making it a viable solution for families in nearly any climate.
Its simple, robust controls and efficient design make it a top-tier choice for those ready to ditch the tank for good.
User Experience
Homeowners who have made the switch to the RTEX-24 rave about the luxury of truly endless hot water.
Families no longer have to schedule showers, and the unit keeps up with heavy demand without issue.
While the electrical requirements are substantial, users who plan for it report that the installation is manageable.
The precise temperature control is another praised feature, providing consistent and safe hot water throughout the house.
DOYXC 110V Under Sink Instant Heater
Best in class for kitchen sinks
The DOYXC Mini tankless water heater is specifically designed to eliminate the frustrating wait for hot water at the sink.
This 110V, 3000W unit heats water in just 3-5 seconds, making it perfect for washing dishes, hands, or produce.
A key feature is its variable frequency design, which automatically adjusts power input based on water flow and temperature settings.
This makes it highly energy-efficient, as it only uses the minimum power required.
The heater is packed with safety features, including IPX4 waterproofing, leakage protection, and dry burning protection.
Its LCD digital display is easy to read, and you can switch between Celsius and Fahrenheit, a convenient feature for user preference.
Product Specs
| Power | 3000W |
| Voltage | 110V |
| Max Temp | 131°F (55°C) |
| Water Connection | 1/2" NPT |
| Wire Gauge | 13 AWG or thicker |
| Waterproof Rating | IPX4 |
Features
- Instant Hot Water: 3000W element provides hot water in 3-5 seconds, up to 131°F.
- Energy Efficient: Variable frequency design automatically adjusts power to save energy.
- Safety Intelligence: IPX4 waterproof, leakage protection, and dry burn protection.
- Compact Design: Perfect for under-sink installation in kitchens, RVs, or bathrooms.
- Convertible Temperature Scale: Easily switch between Celsius and Fahrenheit.
- Easy Installation: Standard 1/2 inch NPT connections and simple setup.
What We Like
- Smart energy-saving technology
- Very fast heating time
- Good range of safety features
- Compact and easy to install
- Affordable point-of-use solution
What We Don't Like
- Only suitable for single, low-flow fixtures
- Requires a dedicated breaker (≥32A)
- Wiring requires 13AWG or thicker wire
Why We Selected This Product
This model was chosen as the best for kitchen sinks because of its smart, energy-saving design.
The variable frequency control is a sophisticated feature for such an affordable unit, effectively reducing energy waste.
Its comprehensive safety protections and easy installation make it a practical and reliable choice for adding on-demand hot water to any sink in the house, particularly a high-use kitchen sink.
User Experience
Users are delighted with the immediate hot water this unit provides, transforming their daily kitchen tasks.
The energy savings from not having to run the main water heater for small jobs are a significant benefit.
Its compact size allows it to be tucked away discreetly under the sink.
The convertible temperature scale is a small but appreciated feature.
Overall, it's seen as a simple, effective, and economical upgrade for any kitchen.
LiberLive 11kW Electric Tankless Water Heater
Best in class for compact design
The LiberLive 11kW electric tankless water heater is an excellent choice for those with limited space.
Its remarkably slim profile (only 2.8 inches deep) allows it to be installed in very tight quarters.
Despite its size, this 240V unit delivers powerful on-demand performance, with a 99% thermal efficiency that can support 1-3 simultaneous hot water outlets depending on the flow rate.
It features an intuitive knob control with a clear LED display, allowing you to set the temperature precisely between 86°F and 131°F.
Safety is assured with CSA certification and a host of protections like leakage, overheating, and damp-proofing.
This heater proves that you don't need a bulky unit to get reliable, endless hot water.
Product Specs
| Power | 11 kW |
| Voltage | 240V |
| Max Flow Rate | 2.6 GPM |
| Water Connection | 1/2" NPT |
| Dimensions | 7.9" x 2.8" x 11" |
| Certification | CSA |
Features
- Ultra-Compact Design: Slim profile (7.9" x 2.8" x 11") fits in tight spaces.
- Energy & Cost Efficient: Heats water on demand with 99% thermal efficiency, saving up to 60% on costs.
- Powerful Performance: 11kW element supports 1.0–2.6 GPM.
- Precise Control: Intuitive knob control and LED display for easy temperature setting (86°F–131°F).
- Built for Safety: CSA-listed with leakage, overheating, and damp-proofing safeguards.
- Easy Installation: Standard 1/2" NPT water connections.
What We Like
- Extremely slim and space-saving
- CSA certified for safety and reliability
- Simple and intuitive knob control
- High thermal efficiency
- Good performance for its size
What We Don't Like
- Requires a 60A breaker
- May not be sufficient for high-demand, whole-home use
Why We Selected This Product
We picked the LiberLive model for its outstanding space-saving design without compromising on safety or performance.
Its CSA certification is a significant mark of quality and reliability.
The combination of a powerful 11kW element, user-friendly knob control, and an ultra-compact form factor makes it a versatile solution for apartments, small homes, or as a dedicated heater for a master bathroom.
User Experience
Users are consistently impressed by how much performance comes out of such a small unit.
Its slim design is a major selling point, allowing installation in places where other heaters wouldn't fit.
The simple knob control is praised for being straightforward and reliable.
It provides ample hot water for a single shower, even in cooler climates, and its energy efficiency is a welcome bonus for users looking to reduce their utility expenses.
What to Look for Before Buying the Best On Demand Electric Water Heater
Choosing the right tankless water heater involves more than just picking the most powerful model. To ensure you get a unit that meets your needs and works flawlessly in your home, consider these crucial factors.
Find Your Need - Compatibility and use case considerations
First, determine your hot water demand. How many people are in your household? How many hot water appliances might run simultaneously? A small apartment with one bathroom has very different needs than a large house with three bathrooms and a high-efficiency washing machine. Calculate your peak flow rate requirement in gallons per minute (GPM). Also, consider the temperature rise needed. This is the difference between your incoming groundwater temperature and your desired output temperature (typically 105-120°F). Colder climates require a more powerful heater to achieve the same temperature rise. For more specialized needs, you might want to check out the best point of use electric water heater for single-faucet solutions.
Budget - Setting realistic price expectations
On-demand electric water heaters can range from under $100 for small, point-of-use models to over $700 for high-capacity, whole-home units. Set a realistic budget, but remember to factor in potential installation costs. A high-power 240V unit might require a new, dedicated circuit run by a licensed electrician, which can add several hundred dollars to the total cost. While a cheaper model might be tempting, investing in a unit from a reputable brand with good efficiency ratings can save you more money in the long run through lower utility bills and greater longevity.
Key Features - Most important technical specifications
Look closely at the technical specs. The Kilowatt (kW) rating indicates the heater’s power—higher kW means a faster temperature rise and higher flow rate. Voltage (110V/120V vs. 240V) is critical; 110V units are for single-point use, while 240V units are for showers and whole-home applications. Check the required amperage and breaker size to ensure your electrical panel can support it. Advanced features like self-modulating technology are highly desirable, as they adjust power usage automatically to save energy.
Quality & Durability - What to look for in construction
The internal components are key to a long service life. Heaters with copper or stainless steel heating elements are generally more durable and resistant to corrosion than other materials. Look for certifications like ETL or CSA, which indicate the product has met rigorous safety and performance standards. A good warranty is also a sign of a manufacturer’s confidence in their product’s durability. If you have specific water conditions, such as well water, you might need a more robust unit like the best electric water heater for well water.
Brand Reputation - Importance of established manufacturers
While newer brands can offer innovative features, established manufacturers like Rheem and EcoSmart have a long track record of reliability, customer support, and parts availability. Reading user reviews and professional ratings can provide insight into a brand’s real-world performance and how they handle warranty claims or technical issues. A trusted brand often means better build quality and a more dependable product.
Portability/Size - Considerations for space and storage
One of the biggest advantages of tankless heaters is their compact size. Measure the space where you plan to install the unit to ensure a proper fit, leaving adequate clearance as specified by the manufacturer. If you need a heater for an RV or a temporary setup, look for lightweight, portable 110V models. For permanent installations, the slim profile of most tankless units allows them to be mounted on a wall in a closet, basement, or utility room, freeing up valuable floor space previously occupied by a bulky tank.
Is it A Wise Decision to Buy on demand electric water heater?
Absolutely. Investing in an on-demand electric water heater is one of the smartest upgrades a homeowner can make for both comfort and efficiency. Unlike traditional tank heaters that constantly burn energy to keep dozens of gallons of water hot, a tankless unit heats water only when you turn on the faucet. This fundamental difference can lead to energy savings of up to 60%, resulting in a significant reduction in your monthly utility bills. The upfront cost may be higher than a conventional tank, but the long-term energy savings often allow the unit to pay for itself over its lifespan.
Beyond the financial benefits, the performance improvement is undeniable. You get an endless supply of hot water. There’s no more waiting for a tank to refill and reheat, and no more rushing through a shower before the hot water runs out. This is a game-changer for families. Furthermore, tankless heaters have a much longer lifespan—often 20 years or more, compared to the 10-15 years of a tank heater. They also save a tremendous amount of space and, because they don’t store water, they eliminate the risk of a catastrophic tank leak and the associated water damage. For modern homes focused on efficiency and convenience, a tankless water heater is a truly wise decision.
What Is the Best Way to Choose on demand electric water heater?
Choosing the best on-demand electric water heater requires a methodical approach to ensure you get a unit that perfectly matches your home’s needs. Follow these steps for a successful selection process.
1. Assess Your Hot Water Demand: Start by calculating your peak GPM (gallons per minute) requirement. List the fixtures you might use simultaneously (e.g., shower at 2.5 GPM, kitchen sink at 1.5 GPM) and add their flow rates together. This gives you a target GPM your heater must support.
2. Determine Your Required Temperature Rise: Find the average temperature of your home’s incoming groundwater. You can find this online or measure it. Subtract this from your desired hot water temperature (e.g., 110°F). For example, if your groundwater is 50°F, you need a 60°F temperature rise. The heater’s specifications will show what GPM it can deliver at various temperature rises.
3. Evaluate Your Electrical System: This is a critical step. Check your home’s main electrical panel. Do you have enough total amperage (most homes have 100, 150, or 200 amps)? Do you have empty slots for the new breakers the heater requires? A whole-home unit might need two or three 40-amp or 50-amp breakers. If your panel is full or lacks capacity, factor in the cost of an electrical upgrade.
4. Compare Features and Brands: Once you know your GPM, temperature rise, and electrical capacity, you can start comparing models. Look for energy-saving features like self-modulation. Read reviews for brands like Rheem, EcoSmart, and Orbek to gauge reliability and customer satisfaction. Check the warranty—a longer warranty often indicates better quality.
5. Plan for Installation: Decide if you will DIY or hire a professional. While some point-of-use units are simple to install, whole-home 240V models are best left to licensed plumbers and electricians. Getting a professional quote beforehand can help you finalize your budget.
Common Mistakes to Avoid:
- Undersizing the Heater: Buying a unit that can’t meet your peak demand will result in lukewarm water and frustration. Always size up if you’re unsure.
- Ignoring Electrical Requirements: Failing to check your panel capacity is a common and costly mistake.
- Forgetting about Water Hardness: If you have hard water, consider installing a water softener to prevent scale buildup inside the heater, which can reduce its efficiency and lifespan. For more information, read about the best electric water heater for hard water.
FAQ
What is the best on demand electric water heater for beginners?
For beginners, a simple point-of-use model like the xwdzswgs 110V Instant Electric Water Heater is an excellent start. It’s easy to install under a single sink, doesn’t require complex 240V wiring, and provides immediate results. This allows you to understand the benefits of tankless heating on a small scale before committing to a whole-home system.
How much should I spend on on demand electric water heater?
You can expect to spend between $100 for a basic point-of-use model and $700+ for a high-capacity whole-home unit. A good mid-range model for an apartment or small home, like the Orbek 14kW, typically costs around $200-$350. Remember to budget for professional installation if you’re not comfortable with advanced plumbing and electrical work.
What features are most important in on demand electric water heater?
The most important features are the kW rating (power), the maximum GPM at your required temperature rise, and self-modulating technology for energy efficiency. Also, look for durable heating elements (copper or stainless steel) and safety certifications like ETL or CSA. A clear digital display for precise temperature control is also highly valuable.
How do I maintain my on demand electric water heater?
Maintenance is minimal but important. The primary task is to descale the unit annually, especially if you have hard water. This involves flushing the system with a vinegar solution to remove mineral buildup. This process keeps the heating elements efficient and prolongs the heater’s life. Always follow the manufacturer’s specific maintenance instructions.
Are expensive on demand electric water heater worth it?
Often, yes. More expensive models like the Rheem RTEX-24 are worth it if you need their high capacity for a large home. They typically come from more established brands, offer better durability, have more advanced efficiency features, and are backed by stronger warranties. The investment pays off in reliable performance, longevity, and greater energy savings over time.
What brands make the best on demand electric water heater?
Rheem, EcoSmart, and Stiebel Eltron are well-established brands known for quality and reliability. Newer brands like Orbek and ECOTOUCH are also gaining popularity by offering competitive features, advanced technology, and excellent value. Choosing a brand with a strong reputation for customer support and parts availability is always a good strategy.
How long do on demand electric water heater typically last?
On-demand electric water heaters have a significantly longer lifespan than traditional tank heaters. With proper maintenance, a quality tankless unit can last 20 years or more. This is because they don’t suffer from the constant corrosive effects of storing hot water. Their longevity is a key factor in their overall value proposition.
Can I find good on demand electric water heater on a budget?
Yes, you can find excellent budget-friendly options, especially for point-of-use applications. Models from brands like xwdzswgs or DOYXC offer instant hot water for a single sink for under $100. For a budget-friendly whole-home option in a warm climate, the EcoSmart ECO 11 provides incredible efficiency and value for its price.
Final Verdict
After extensive research and comparison, the Orbek 14kW Tankless Water Heater stands out as the Best Overall on-demand electric water heater. It offers an ideal combination of power, smart temperature control, robust safety features, and high energy efficiency, making it a perfect fit for the needs of most modern households.
For those on a tighter budget or in need of a simple solution for a single sink, the xwdzswgs 110V Instant Electric Water Heater provides unbeatable value. It’s compact, easy to install, and effectively eliminates the wait for hot water at the tap.
If maximum power and whole-home performance are your priority, the premium Rheem RTEX-24 24kW Electric Tankless Water Heater is the ultimate choice. It has the capacity to handle the demands of a large family and multiple bathrooms without breaking a sweat, all from a brand synonymous with quality.
Your next step is to assess your home’s specific GPM and electrical needs using our buying guide. Once you have your requirements, you can confidently select one of these top-rated models and start enjoying the endless comfort and efficiency of on-demand hot water.
