When choosing a tankless water heater electric, the main considerations are capacity, installation complexity, energy efficiency, and price. The best overall pick, the Rheem RTEX-13, offers a reliable balance of performance and affordability for small to medium homes. For those needing higher capacity, the Rheem RTEX-24 provides more power but at a higher price point. Meanwhile, compact models like the 3000W Digital Display Heater excel for single fixtures or RVs but aren’t suitable for larger households. These tradeoffs can make choosing the right unit challenging—continue reading for a full breakdown of the top options and what to consider before buying.
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Key Takeaways
- The top picks balance power, size, and ease of installation, with Rheem models leading in reliability.
- Higher wattage units provide greater flow capacity but tend to cost more and require more robust electrical wiring.
- Compact models are best suited for small spaces or single fixture use, not whole-home applications.
- WiFi-enabled options like the Westinghouse improve control but often come at a premium price.
- Overall, the best value combines sufficient capacity with affordability, avoiding overpaying for features you won’t use.
| Rheem 11kW Multi Fixture Tankless Electric Water Heater – 240V |  | Best Compact Solution for Multi-Fixture Use | Power: 11kW | Voltage: 240V | Flow Rate: up to 2.68 GPM | VIEW ON AMAZON | See Our Full Breakdown |
| Rheem 18kW 240V Tankless Electric Water Heater, Gray |  | Best Whole-Home Hot Water Solution | Wattage: 18000 watts | Voltage: 240V | Flow Rate: 4.4 GPM | VIEW ON AMAZON | See Our Full Breakdown |
| Tankless Electric Water Heater, 3000W, 110V, Digital Display, Compact & Wall-Mountable |  | Best for Small, Space-Constrained Settings | Power: 3000W | Voltage: 110V | Flow Rate: 0.3GPM to 0.5GPM | VIEW ON AMAZON | See Our Full Breakdown |
| Rheem 240V Tankless Water Heater RTEX-13, Gray |  | Best Digital Control and Precise Temperature Management | Voltage: 240V | Flow Rate: up to 3.17 GPM | Power: 13kW | VIEW ON AMAZON | See Our Full Breakdown |
| Rheem 8kW Multi Fixture Tankless Electric Water Heater – 240V | | Best Budget-Friendly Multi-Fixture Solution | Power: 8kW | Voltage: 240V | Flow Rate: up to 1.95 GPM | VIEW ON AMAZON | See Our Full Breakdown |
| Westinghouse 14kW Tankless Electric Water Heater, 240V, WiFi, ETL Certified, Gray |  | Best Overall for Smart, Compact Residential Use | Power: 14kW | Voltage: 240V | Connections: 1/2″ NPT | VIEW ON AMAZON | See Our Full Breakdown |
| 14kW Tankless Electric Water Heater 240V for Sink & Shower, Gray |  | Best for Single or Dual Point Hot Water Needs | Power: 14kW | Voltage: 240V | Dimensions: 15.87″ x 11.14″ x 2.87″ | VIEW ON AMAZON | See Our Full Breakdown |
| Rheem RTEX-24 24kW 240V Electric Tankless Water Heater |  | Best for Larger Households Needing Higher Flow Rates | Power: 24kW | Voltage: 240V | Flow Rate: Up to 5.9 GPM | VIEW ON AMAZON | See Our Full Breakdown |
| 18kW Electric Tankless Water Heater 240V WiFi |  | Best for Moderate Households in Mild Climates | Power: 18kW | Voltage: 240V | Maximum hot water output: 4.3 gallons per minute | VIEW ON AMAZON | See Our Full Breakdown |
| tankless water heater electric | Voltage | Power | Flow Rate |
|---|---|---|---|
| Rheem 11kW Multi Fixture Tankl | 240V | 11kW | up to 2.68 GPM |
| Rheem 18kW 240V Tankless Elect | 240V | — | 4.4 GPM |
| Tankless Electric Water Heater | 110V | 3000W | 0.3GPM to 0.5GPM |
| Rheem 240V Tankless Water Heat | 240V | 13kW | up to 3.17 GPM |
| Rheem 8kW Multi Fixture Tankle | 240V | 8kW | up to 1.95 GPM |
| Westinghouse 14kW Tankless Ele | 240V | 14kW | — |
| 14kW Tankless Electric Water H | 240V | 14kW | — |
| Rheem RTEX-24 24kW 240V Electr | 240V | 24kW | Up to 5.9 GPM |
| 18kW Electric Tankless Water H | 240V | 18kW | — |
More Details on Our Top Picks
Rheem 11kW Multi Fixture Tankless Electric Water Heater – 240V
This Rheem model stands out for its space-saving design and ability to serve multiple fixtures simultaneously, making it a strong choice for small homes or apartments with moderate hot water needs. Compared to the Rheem RTEX-13, it offers a higher flow rate of 2.68 GPM, but still requires professional electrical installation due to its 240V requirement. Its compact size and no venting needs simplify installation, though its flow rate limits its use for high-demand situations. This model is ideal for users needing reliable, on-demand hot water for several fixtures without occupying much space, but it’s not suited for large households or high flow demands.
- Space-efficient, suitable for tight spaces
- Energy-efficient, heats water only when needed
- Suitable for multiple fixtures
However, the flow rate of 2.68 GPM may fall short for larger households, and specific electrical wiring can complicate setup.
Pros:- Space-saving compact design
- Energy-efficient operation
- Suitable for multiple fixture use
Cons:- Requires professional electrical installation
- Limited flow rate of 2.68 GPM
Best for: Small households or apartments needing hot water for multiple fixtures within limited space.
Not ideal for: Large families or homes with high simultaneous hot water demands, due to its limited flow rate.
- Power:11kW
- Voltage:240V
- Flow Rate:up to 2.68 GPM
- Temperature Range:80°F – 140°F
- Warranty:5-Year Leak, 1-Year Parts
Our verdict“This model makes the most sense for small homes or apartments where space is limited and moderate hot water needs exist.”
Rheem 18kW 240V Tankless Electric Water Heater, Gray
This Rheem unit provides a robust 4.4 GPM flow rate, making it well-suited for larger households or homes with higher hot water demands. Unlike the Rheem 11kW model, it offers a higher capacity, but its 18kW power draw and installation complexity mean it often requires professional help. Its digital thermostatic control and copper heating elements promise durability and precise temperature management. Compared to smaller units, it supports more fixtures at once, but it may be overkill for single fixtures or small spaces. This pick is ideal for those seeking a reliable, continuous hot water supply for a medium to large home, though the higher electrical requirements limit its ease of installation for some users.
- High flow rate suitable for larger households
- Energy-efficient with self-modulating technology
- Durable copper heating elements
Its main tradeoff is the need for professional installation and electrical capacity upgrades, which can add to initial costs.
Pros:- Provides continuous hot water on demand
- Self-modulating energy efficiency
- Durable copper heating elements
Cons:- Installation may require professional help
- Flow rate may be insufficient for very large households
Best for: Medium to large households needing continuous hot water across multiple fixtures.
Not ideal for: Small apartments or single-fixture applications, where a less powerful, easier-to-install unit suffices.
- Wattage:18000 watts
- Voltage:240V
- Flow Rate:4.4 GPM
- Maximum Temperature:140 °F
- Efficiency:99.8%
- Dimensions:14.5″ W x 18.25″ H
Our verdict“This makes the most sense for larger homes where higher flow capacity and durability are priorities, despite more complex installation needs.”
Tankless Electric Water Heater, 3000W, 110V, Digital Display, Compact & Wall-Mountable
This 3000W, 110V unit is perfect for quick, small-scale hot water needs, especially in tight spaces like kitchens, RVs, or camping setups. Its rapid temperature rise and digital display make it user-friendly, while safety features like leakage and dry-burning protections add reliability. Compared with higher wattage models like the Rheem RTEX-13, it offers less flow but is incredibly easy to install and operate in limited areas. Its vertical-only installation limits placement options, but the compact design and straightforward connections make it ideal for small, low-demand applications. This model suits users who need instant hot water for small tasks but isn’t meant for showers or high-flow use.
- Compact, wall-mounted design
- Fast temperature rise with digital control
- Safety protections for reliable use
Its limited flow rate and vertical installation requirement restrict it from high-demand or multi-user scenarios.
Pros:- Space-efficient, wall-mounted design
- Fast temperature adjustment with digital display
- Multiple safety protections
Cons:- Limited flow rate (0.3-0.5 GPM)
- Vertical installation only
Best for: RVers, small kitchens, or small-scale indoor applications with low hot water volume needs.
Not ideal for: Households requiring shower-level flow rates or multiple fixtures simultaneously, due to its low GPM capacity.
- Power:3000W
- Voltage:110V
- Flow Rate:0.3GPM to 0.5GPM
- Temperature Rise:82°F to 131°F
- Protection Features:IPX4 waterproof, leakage, dry-burning
- Installation:Vertical only
Our verdict“This unit is best suited for small, low-demand settings where space and quick heat-up are priorities.”
Rheem 240V Tankless Water Heater RTEX-13, Gray
This Rheem RTEX-13 offers a flow rate of 3.17 GPM, making it suitable for small to medium households, especially those prioritizing precise temperature control. Its digital LED display and adjustable temperature in 1°F increments provide excellent user control, unlike simpler models with basic thermostats. Compared to the Rheem 11kW model, it provides a higher flow rate and better temperature accuracy, but it still requires a 240V power supply and professional installation. Its water-saver shower head adds value, though flow rate limits its use in larger households. It’s ideal for users who want detailed temperature management and energy efficiency but are aware of its flow constraints.
- Digital LED display for easy temperature adjustments
- Flow rate up to 3.17 GPM for moderate demand
- Includes water-saving shower head
Its main limitation is the flow rate, which might not suffice for households with multiple simultaneous hot water needs.
Pros:- Digital temperature adjustment with LED display
- High efficiency at 99.8%
- Includes water-saving shower head
Cons:- Flow rate may be limiting for larger households
- Requires 240V power connection
Best for: Small to medium households that value precise temperature control and energy efficiency.
Not ideal for: Large households or high-demand applications, where higher flow rates are necessary.
- Voltage:240V
- Flow Rate:up to 3.17 GPM
- Power:13kW
- Efficiency:99.8%
- Additional Features:Water-Saver Shower Head, LED display
Our verdict“This unit is ideal for users wanting fine control over temperature in small to medium settings, despite flow limitations.”
Rheem 8kW Multi Fixture Tankless Electric Water Heater – 240V
This Rheem 8kW model offers a modest flow rate of 1.95 GPM, making it suitable for small homes or apartments where hot water demands are moderate. Its compact design and digital temperature controls provide convenience, but it shares the same electrical and flow limitations as the 11kW model, just at a lower power level. Compared to higher wattage options like the Rheem RTEX-13, it’s less capable of supporting multiple fixtures simultaneously, but it remains a good entry-level choice for budget-conscious buyers. Its 5-year leak warranty adds peace of mind, although the limited flow rate and electrical requirements mean it’s best for smaller or less demanding setups.
- Compact design suitable for small spaces
- Digital controls for precise temperature
- Energy-efficient operation
Its main limitations are the flow rate and electrical hookup, which may restrict its use in larger households or complex electrical setups.
Pros:- Compact, space-saving design
- Digital temperature controls
- Energy-efficient operation
Cons:- Requires professional electrical setup
- Limited flow rate of 1.95 GPM
Best for: Small households or apartments needing reliable hot water for a few fixtures without high flow demands.
Not ideal for: Large households or homes with multiple simultaneous hot water needs, due to limited flow rate and electrical capacity.
- Power:8kW
- Voltage:240V
- Flow Rate:up to 1.95 GPM
- Temperature Range:80°F – 140°F
- Warranty:5-Year Leak, 1-Year Parts
Our verdict“This is a good budget option for small homes or apartments where moderate hot water needs exist, but it’s not for high-demand households.”
Westinghouse 14kW Tankless Electric Water Heater, 240V, WiFi, ETL Certified, Gray
This Westinghouse model stands out for its combination of instant hot water delivery—just 3 seconds—and smart home integration, making it ideal for tech-savvy homeowners who want reliable performance without bulky equipment. Compared to the Rheem RTEX-24, it offers comparable power but adds WiFi and voice control, enhancing convenience. However, it requires a dedicated 60A double-pole breaker, which could mean additional electrical work, and its maintenance involves cleaning inlet filters. Its compact size fits well in tight spaces, and safety features like leakage and overheat protection are standard at this level. Despite needing specific wiring, this pick is best for those seeking an easy-to-control, space-efficient system that prioritizes smart features over high flow rates.Pros:- Instant hot water in just 3 seconds
- Smart WiFi and voice control compatibility
- Compact size fits in various spaces
- High safety and durability features
Cons:- Requires dedicated 60A double-pole breaker and specific wiring
- Limited to residential applications
- Maintenance needed for inlet filter and rotor
Best for: Homeowners with existing smart home setups seeking reliable instant hot water in small to medium spaces
Not ideal for: Large households or those with limited electrical capacity, since it’s designed for residential use with specific wiring requirements
- Power:14kW
- Voltage:240V
- Connections:1/2″ NPT
- Dimensions:12.59″H x 9.56″W x 3.28″D
- Certifications:ETL
- Protection Features:Leakage, overheat, dry-fire, over-voltage
Our verdict“This model suits tech-savvy homeowners wanting quick hot water with smart controls in small to medium residential setups.”
14kW Tankless Electric Water Heater 240V for Sink & Shower, Gray
This 14kW unit offers reliable instant hot water for one or two fixtures, making it an excellent choice for small households or specific sink/shower setups. It boasts high thermal efficiency at 99.8%, with smart temperature control via LED display, clearly superior to basic models. Compared to the Westinghouse, it features a more straightforward installation for single points but requires a 60-amp circuit, which might involve electrical upgrades. Its compact design makes it suitable for tight spaces, yet it’s limited to 1-2 usage points, so larger households should consider higher-capacity options. Overall, it’s an efficient, space-efficient solution for targeted hot water needs, though not ideal for whole-house applications.Pros:- Energy-efficient with no standby power loss
- Smart LED temperature control
- Compact and easy to install
- High thermal efficiency (99.8%)
Cons:- Requires a 60-amp circuit, possibly needing electrical upgrade
- Limited to 1-2 points of use
- Installation complexity for some users
Best for: Individuals or small households needing hot water at one or two points, such as a sink and shower
Not ideal for: Large families or homes with multiple bathrooms, due to its limited flow capacity
- Power:14kW
- Voltage:240V
- Dimensions:15.87″ x 11.14″ x 2.87″
- Water connection:1/2″ NPT
- Temperature range:86°F to 131°F
- Efficiency:99.8%
Our verdict“Ideal for small-scale hot water applications where efficiency and space are priorities, but unsuitable for entire households.”
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater
The Rheem RTEX-24 offers up to 5.9 GPM, making it suitable for homes with multiple fixtures running simultaneously. It provides precise digital thermostatic controls, simplifying temperature adjustments, and its compact size helps save space. Compared to the 14kW units, it delivers higher flow, but installation requires a professional due to its 24kW capacity and electrical demands, including specialized wiring. While its 5-year leak warranty adds confidence, its flow rate might fall short for larger households with high water demand. This model makes the most sense for medium to large residences where space-saving is still a priority, but it’s less ideal for those on a tight electrical budget or with very high flow needs.Pros:- Provides on-demand hot water with high flow capacity
- Digital temperature controls for precise settings
- Compact size for space-saving installation
- 5-year leak warranty
Cons:- Requires professional installation due to electrical complexity
- Limited flow rate for very large households
- No venting needed but still complex electrical setup
Best for: Households with multiple bathrooms or fixtures needing higher flow rates and precise temperature control
Not ideal for: Small apartments or single-user scenarios where lower capacity units suffice, due to its higher power requirements
- Power:24kW
- Voltage:240V
- Flow Rate:Up to 5.9 GPM
- Temperature Range:80°F – 140°F
- Warranty:5-year leak, 1-year parts
Our verdict“This model fits medium to large homes with multiple fixtures and high hot water demand, assuming electrical capacity is available.”
18kW Electric Tankless Water Heater 240V WiFi
This 18kW model strikes a balance between power and efficiency, providing continuous hot water for homes with 2-3 bathrooms in milder climates. Its self-modulating technology helps optimize energy use, and WiFi control adds convenience for remote adjustments. Compared to the Rheem RTEX-24, it has slightly less flow capacity but is easier to install in homes with existing compatible electrical setups. Its maximum output of 4.3 GPM makes it suitable for moderate household needs, though larger families or homes with high simultaneous demand might find it limiting. Still, for its size and features, it offers a strong blend of energy savings and smart control, provided the electrical setup is compatible.Pros:- Provides continuous hot water without delays
- Energy-efficient with up to 99% savings
- Space-saving wall-mounted design
- WiFi control for remote temperature management
Cons:- Requires professional installation and specific electrical setup
- Limited hot water output for larger households
- Maximum flow of 4.3 GPM may be insufficient for very high demand
Best for: Families in mild climates with 2-3 bathrooms seeking a space-efficient, WiFi-enabled hot water solution
Not ideal for: Homes with higher hot water demand or in colder climates where higher flow rates are necessary
- Power:18kW
- Voltage:240V
- Maximum hot water output:4.3 gallons per minute
- Dimensions:11.1” W x 19.2” H x 4” D
- Water connection:3/4″ NPT
- Safety certifications:ETL
Our verdict“This model suits moderate-sized homes in mild climates needing reliable, remotely controllable hot water but not high flow rates.”
How We Picked
The products in this roundup were evaluated based on their power output, installation ease, durability, and overall value. We prioritized models with reliable performance across typical household demands, considering whether they support multiple fixtures or just single outlets. Ease of use was also key, including digital controls and space-saving design. Price-to-performance ratio was a major factor, ensuring each pick offers good value for different budgets. Finally, we included a mix of WiFi-enabled models and basic units to cater to various user preferences and technical comfort levels, ranking them by overall versatility and reliability.Factors to Consider When Choosing Tankless Water Heater Electric
Selecting the right electric tankless water heater involves understanding several key factors. Beyond initial price, consider how much hot water capacity you need, your electrical system’s capabilities, and space constraints. Knowing these details helps avoid common pitfalls, like under-sizing your unit or installing one that’s too complex for your home’s wiring. The following sections cover the most important considerations to help you make an informed choice.Capacity and Power Output
Choosing the right wattage is essential to meet your household’s hot water demands. Higher wattage units, like 18kW or 24kW, can support multiple fixtures simultaneously, making them suitable for larger homes. Conversely, lower wattage models are better for single sinks or small apartments. Overestimating capacity can lead to unnecessary costs and electrical upgrades, while underestimating causes inadequate hot water flow. Assess your daily hot water needs carefully to select a unit that balances performance and efficiency.
Electrical Requirements and Compatibility
Most electric tankless heaters operate on 240V, but some models have specific wiring or circuit requirements. Before purchasing, verify your home’s electrical capacity to support the unit—overloading existing circuits can be risky or require expensive upgrades. Additionally, pay attention to the amperage draw; higher wattage models may need dedicated circuits. Ensuring compatibility helps prevent installation delays and safety hazards, making it worth consulting an electrician if you’re unsure.
Size and Installation Space
Compact design is a hallmark of many modern electric tankless heaters, which is beneficial for limited spaces. But size isn’t just about footprint; consider the clearance needed for maintenance and ventilation if applicable. Installing a unit in a congested area might complicate service or future upgrades. Measure your available space carefully and choose a model that fits comfortably while providing easy access for routine checks.
Efficiency and Control Features
Energy efficiency can significantly reduce operating costs over time. Features like digital thermostats allow precise temperature control, preventing scalding and saving energy. Some units include WiFi connectivity for remote monitoring and adjustments, appealing to tech-savvy users. However, these features often come at a higher price, so weigh their benefits against your budget and comfort with technology.
Price and Long-Term Value
While budget models are tempting, investing in a slightly more expensive unit can deliver better durability, capacity, and energy savings. Cheap units may require more frequent repairs or replacement, adding to total costs. Consider the warranty period and brand reputation as indicators of long-term value. Think of your purchase as an investment in reliable, consistent hot water rather than just the initial expense.
Frequently Asked Questions
Can I install a tankless water heater electric myself?
While some handy homeowners with electrical experience may handle basic installation, most electric tankless water heaters require specific wiring and adherence to safety codes. Incorrect wiring or inadequate electrical capacity can lead to hazards or damage. For safety and compliance, hiring a licensed electrician is recommended, especially for high-wattage units that may need dedicated circuits. Proper installation ensures reliable operation and peace of mind.
Will a tankless electric water heater support multiple fixtures at once?
This depends on the wattage and flow rate of the unit. Lower wattage models, like 8kW or 11kW, are typically suitable for single fixtures or small setups. Higher capacity units, such as 18kW or 24kW models, can often support multiple outlets simultaneously, making them better suited for larger households. Always check the flow rate and temperature rise specifications to match your household’s hot water needs.
How much space do I need to install a tankless electric heater?
Most modern models are quite compact, often wall-mountable with minimal clearance. However, it’s important to account for space around the unit for ventilation, maintenance, and electrical connections. Measure your available area and choose a model with dimensions that fit comfortably. Proper spacing not only facilitates installation but also ensures easy access for future service or repairs.
Are WiFi-enabled electric tankless water heaters worth the extra cost?
WiFi features offer convenience through remote temperature adjustments and usage monitoring, which can save energy and prevent running out of hot water unexpectedly. However, these features come at a premium, and their benefits depend on your comfort with smart home devices. If you prefer simplicity or are on a tight budget, a basic model may provide all the functionality you need without added complexity.
What is the typical lifespan of an electric tankless water heater?
With proper maintenance, most electric tankless heaters last between 20 to 25 years. Regular flushing and component checks help prevent mineral buildup and electrical issues. Investing in a quality brand with a good warranty can extend lifespan and reduce long-term replacement costs. Keep in mind that some parts, like heating elements, may need replacement after several years of use.
Conclusion
For those seeking a reliable, all-around performer capable of supporting a household, the Rheem RTEX-13 stands out as the best overall choice. Budget-conscious buyers or singles may prefer the compact 3000W Digital Display Heater for its affordability and simple operation. Homeowners with higher hot water demands should consider the Rheem RTEX-24 for its increased capacity. Tech enthusiasts will find the Westinghouse WiFi model appealing, though at a higher cost. Ultimately, your pick depends on your household size, electrical setup, and budget—use this guide to match your needs with the right unit.
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