Searching for the best electric tankless water heaters? The top pick for overall performance is the Stiebel Eltron Tempra 24 Trend, known for its reliable performance and high efficiency. For smaller homes or apartments, the 18kW NOVIEEX Model offers solid flow rates at an affordable price. Meanwhile, the Westinghouse Wi-Fi Units stand out for smart control and ease of use. The challenge in this category lies in balancing flow capacity, energy efficiency, and upfront cost. Continue reading for a detailed breakdown of these models and how they compare across key factors.
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Key Takeaways
- The highest wattage models generally provide better flow rates, but often come at a higher price and increased energy use.
- Wi-Fi enabled units add convenience but may introduce complexity or slight reliability issues compared to traditional models.
- Compact units are suitable for small spaces but usually have lower flow capacities, limiting their use to single fixtures.
- ETL certification is a good indicator of safety and compliance, especially for models with advanced features.
- Price often correlates with features like flow rate, digital controls, and smart connectivity, but the most expensive isn’t always the best for every need.
| electric tankless water heater | Voltage | Flow Rate | Maximum Temperature | Power Source |
|---|---|---|---|---|
| 18kW Tankless Electric Water H | 240V | 4.9 GPM | 140°F | — |
| Westinghouse Tankless Water He | 240V | 4.2 GPM | 140°F | Hard Wiring |
| 14kW Tankless Electric Water H | 240 volts | 3.3 gpm | 131 °F | AC |
| Stiebel Eltron Tempra 24 Trend | 240V | — | — | — |
| Westinghouse 14kW Tankless Ele | 240 volts | 3.4 GPM | 140 °F | Hard Wiring |
| 14kW Electric Tankless Water H | 240 volts | 3.4 GPM | 131°F | AC |
| 14kW Tankless Electric Water H | 240 volts | 3.38 GPM | 140 °F | Hard Wiring Required |
| Electrolux 14kW WiFi Tankless | 240 volts | 3.4 GPM | 140 °F | Hard Wiring Required |
More Details on Our Top Picks
18kW Tankless Electric Water Heater, NOVIEEX 240V, 4.9 GPM, Indoor Use for Apartments and Small Homes
This model stands out for its impressive flow rate of 4.9 GPM, making it suitable for small to medium households that need multiple fixtures to run simultaneously. Compared with the Westinghouse 14kW model, the NOVIEEX offers a higher flow rate and more precise temperature control thanks to its LED display. However, it requires professional electrical installation due to its 18kW power draw, which could be a barrier for DIY enthusiasts. The safety features and high efficiency make it a dependable choice for those prioritizing reliability and cost savings, although it’s limited to indoor use and smaller homes. Its robust performance makes it ideal for apartments or small homes where space and safety are key concerns.
Pros:- High flow rate supports multiple fixtures simultaneously
- Precise temperature control with LED display
- High energy efficiency reduces costs by up to 60%
Cons:- Requires professional installation due to high power requirements
- Limited to small-to-medium-sized households
- No included mounting hardware
Best for: Small households or apartments needing reliable multiple fixture support with quick setup.
Not ideal for: Large families requiring higher hot water volumes or homes with limited electrical capacity.
- Power:18 kW
- Voltage:240V
- Flow Rate:4.9 GPM
- Maximum Temperature:140°F
- Dimensions:11.14″ W x 15.86″ H x 3.18″ D
- Water Connections:3/4″ NPT
Our verdict“This pick suits small households seeking a high-capacity, reliable indoor water heater that balances performance with safety.”
Westinghouse Tankless Water Heater Electric 18kW 240V Wi-Fi Whole House Use
This model excels in offering smart control with Wi-Fi compatibility and is perfect for tech-savvy users who want remote operation, especially when compared to the more straightforward NOVIEEX. Its compact size makes it ideal for small spaces, and features like Alexa and Google Home integration add convenience. However, it demands a 240V/75A electrical connection, which might require upgrading existing wiring, and its flow rate of 4.2 GPM could be limiting for larger households. Its self-modulating technology and safety certifications enhance reliability, but the need for professional installation and power capacity limits make it less suitable for DIY installation or homes with electrical restrictions. This product is best for those who want intelligent control and compact design in small residences.
Pros:- Instant hot water with fast heating
- Wi-Fi app control compatible with smart home devices
- Compact size fits in tight spaces
Cons:- Requires 240V/75A electrical connection
- Professional installation recommended
- Flow rate varies with inlet temperature
Best for: Homeowners interested in smart home integration and remote control for small to medium households.
Not ideal for: Homes with insufficient electrical service capacity or those who prefer simple, non-smart systems.
- Power Source:Hard Wiring
- Wattage:18 KW
- Voltage:240V
- Flow Rate:4.2 GPM
- Maximum Temperature:140°F
- Special Features:Wi-Fi, Alexa & Google Home, Self-Modulating
Our verdict“Ideal for tech enthusiasts wanting a compact, smart-controlled water heater for small homes or apartments.”
14kW Tankless Electric Water Heater 240V for Sink & Shower, Gray
This unit provides instant hot water for 1-2 points, such as a sink and shower, making it suitable for small spaces or secondary applications. Compared to higher wattage options like the Tempra 24 Trend, it offers less capacity but is easier to install and operate. Its energy-efficient design can cut heating costs by up to 50%, but the need for a 60-amp circuit breaker could mean electrical upgrades for some homes. Its compact dimensions are a plus for tight spaces, yet the limited flow rate of 3.3 GPM restricts simultaneous usage. This model makes sense for single-use or small-scale applications but isn’t designed for larger households or multiple fixtures at once.
Pros:- Instant hot water with high thermal efficiency
- Energy-saving design reduces heating costs
- Easy to install with no disassembly required
Cons:- Requires a 60-amp circuit breaker, possibly needing electrical upgrade
- Limited to 1-2 usage points at a time
- Dimensions may need space considerations
Best for: Single fixtures or small households needing quick hot water at one or two points.
Not ideal for: Large families or homes with multiple simultaneous hot water demands.
- Power Source:AC
- Wattage:14 KW
- Voltage:240 volts
- Flow Rate:3.3 gpm
- Maximum Temperature:131 °F
- Mount Type:Wall
Our verdict“This compact heater suits small-scale, single-point applications with limited space and moderate flow needs.”
Stiebel Eltron Tempra 24 Trend Electric Tankless Water Heater, 24kW, 240V
The Tempra 24 Trend is tailored for small to medium homes in warmer climates, offering continuous hot water with its 24kW capacity. Its digital temperature control and self-modulating technology help optimize energy use, making it more efficient than traditional models. Compared to the Westinghouse Wi-Fi model, it lacks smart home connectivity but compensates with a higher electrical demand of 150A, suitable for homes with ample electrical service. Its space-saving design and quiet operation make it easy to install in many settings, yet the high electrical service requirement limits its applicability for older or smaller homes. It’s best for households that can support its power needs and want a reliable, consistent hot water supply without smart features.
Pros:- Provides continuous on-demand hot water
- Space-saving and energy-efficient design
- Digital temperature display for precise control
Cons:- Requires a high electrical service of 150 A
- Less suitable for larger households or colder climates
- No smart home compatibility
Best for: Small to medium homes with sufficient electrical capacity in warm climates.
Not ideal for: Homes with limited electrical service or in cooler climates where multiple showers run simultaneously.
- Power:24kW
- Voltage:240V
- Recommended Electric Service:150 A
- Output Water Temperature:68°F to 140°F
Our verdict“This heater fits small to medium homes needing reliable, continuous hot water without smart features, assuming electrical capacity is sufficient.”
Westinghouse 14kW Tankless Electric Water Heater, 240V, WiFi, ETL Certified, Gray
This model offers rapid hot water response within 3 seconds and supports multiple outlets, making it suitable for small to medium households that value smart features. Its compact size is comparable to the Westinghouse Wi-Fi heater, but it emphasizes instant heating and high thermal efficiency, which can reduce waste and energy costs. The Wi-Fi control and voice command compatibility provide added convenience, though it demands a dedicated 60A double-pole breaker and specific wiring, similar to the other Westinghouse model. Maintenance of inlet filters every 6 months is a small tradeoff for the benefits of quick hot water and smart home integration. It’s best for users who want high performance with the latest connectivity options in a small footprint.
Pros:- Instant hot water in just 3 seconds
- Smart WiFi and voice control compatibility
- High thermal efficiency and safety certifications
Cons:- Requires dedicated 60A double-pole breaker and special wiring
- Limited to 14kW power output, less suitable for larger households
- Maintenance needed for inlet filters
Best for: Tech-savvy households needing fast, reliable hot water with smart home integration.
Not ideal for: Homes lacking dedicated electrical capacity or those preferring simple, non-smart systems.
- Power Source:Hard Wiring
- Special Features:3s Instant Heating, WiFi, Voice Control
- Wattage:14 KW
- Voltage:240 volts
- Flow Rate:3.4 GPM
- Maximum Temperature:140 °F
Our verdict“Perfect for small to medium households seeking rapid hot water and smart features with reliable safety standards.”
14kW Electric Tankless Water Heater, ThermoMate 240V Instant On-Demand Hot Water Heater with Touch Control, Self-Modulating, ETL Certified
The ThermoMate 14kW unit stands out for its compact design and self-modulating technology, making it ideal for small households or single fixtures. Compared to larger models like the Stiebel Eltron Tempra 24, it offers less capacity but excels in space-saving and energy efficiency, using smart modulation to adjust power based on demand. Its ETL certification and safety features add peace of mind, though it requires a dedicated 60 Amp circuit, which might be a hurdle for DIY installations. This heater is best suited for those with limited space who need reliable, on-demand hot water for a single fixture or small household.
Pros:- Compact and space-saving wall-mounted design
- Instant hot water with a flow rate of 3.4 GPM
- Energy-efficient self-modulating technology
- Built-in safety features and ETL certification
Cons:- Requires a dedicated 60 Amp circuit breaker and proper electrical setup
- Limited to small household or single fixture use, not suitable for high demand
Best for: Small households or apartments needing space-efficient, reliable hot water for one fixture
Not ideal for: Large families or homes with multiple fixtures demanding high flow rates
- Power Source:AC
- Wattage:14 KW
- Voltage:240 volts
- Flow Rate:3.4 GPM
- Maximum Temperature:131°F
- Maximum Pressure:150 psi
- Mount Type:Wall
- Item Dimensions:11.2″ W x 15.9″ H
- Item Weight:13 lbs
Our verdict“This model makes the most sense for small spaces where energy efficiency and compact size outweigh high capacity needs.”
14kW Tankless Electric Water Heater, On Demand, 240V, 3.38 GPM
Compared with the ThermoMate, the On Demand 14kW heater offers slightly similar flow at 3.38 GPM but is designed to efficiently supply hot water for 2-3 fixtures, making it suitable for small to medium households. Its built-in safety protections and space-efficient wall-mount design make installation straightforward, although it requires a dedicated 240V/60AMP circuit—similar to the ThermoMate. For those wanting a reliable solution to serve multiple fixtures without sacrificing efficiency, this model provides a good balance, albeit with the same electrical upgrading needs as the ThermoMate.
Pros:- Provides instant, continuous hot water for multiple fixtures
- High efficiency with up to 60% energy savings
- Built-in safety features including leakage and over-temperature protection
- Space-saving wall-mounted design
Cons:- Requires a dedicated 240V/60AMP circuit breaker, possibly needing electrical upgrades
- Limited flow rate might not suffice for larger households with high demand
- Installation complexity may require professional help
Best for: Families or individuals needing hot water for two to three fixtures with energy savings
Not ideal for: Large households with high simultaneous hot water demands or multiple bathrooms
- Power Source:Hard Wiring Required
- Wattage:14 KW
- Voltage:240 volts
- Maximum Temperature:140 °F
- Flow Rate:3.38 GPM
- Dimensions:9.5″ W x 14.2″ H x 3.1″ D
- Mount Type:Wall
Our verdict“This heater suits small to medium households seeking multiple fixtures coverage and energy efficiency without high electrical demands.”
Electrolux 14kW WiFi Tankless Electric Water Heater 240V, Max 3.4 GPM
The Electrolux 14kW WiFi unit introduces smart technology, making it the most connected option among these 14kW heaters. Its remote control via WiFi and Alexa allows users to manage settings from anywhere, which appeals to tech-savvy buyers. Like the others, it provides a flow rate of 3.4 GPM, suitable for one or two fixtures, but adds the benefit of scale inhibitor and safety protections for longer lifespan. Compared to the ThermoMate and On Demand, its smart features elevate convenience, though it shares similar electrical requirements and limited capacity, making it less suitable for large households.
Pros:- Instant hot water delivery in just 3 seconds
- WiFi and Alexa control for remote operation
- Compact, space-saving design
- Includes scale inhibitor and safety protections
Cons:- Requires a 240V/60A electrical circuit, possibly needing upgrades
- Limited to 1-2 fixtures, not for high-demand households
- Installation may be complex for non-professionals
Best for: Small households valuing remote control and smart home integration for hot water management
Not ideal for: Homes with high simultaneous hot water needs or those without reliable WiFi connection
- Power Source:Hard Wiring Required
- Wattage:14 KW
- Voltage:240 volts
- Flow Rate:3.4 GPM
- Maximum Temperature:140 °F
- Heat Output:14 KW
- Mount Type:Wall
- Item Dimensions:8.9″W x 12.8″H
- Item Weight:7.8 pounds
Our verdict“This model is ideal for small households seeking smart features and remote control capabilities, with some electrical upgrade considerations.”
How We Picked
The products in this roundup were evaluated based on performance, usability, build quality, and value. Key factors included flow rate at specific wattages, ease of installation, safety certifications, and smart features like Wi-Fi connectivity. We also considered user reviews and reliability reports to identify models that balance efficiency with durability. The ranking reflects a mix of high performance, affordability, and added features, with an emphasis on models suitable for different household sizes and needs.| electric tankless water heater | Power Source |
|---|---|
| 18kW Tankless Electric Water H | — |
| Westinghouse Tankless Water He | Hard Wiring |
| 14kW Tankless Electric Water H | AC |
| Stiebel Eltron Tempra 24 Trend | — |
| Westinghouse 14kW Tankless Ele | Hard Wiring |
| 14kW Electric Tankless Water H | AC |
| 14kW Tankless Electric Water H | Hard Wiring Required |
| Electrolux 14kW WiFi Tankless | Hard Wiring Required |
Factors to Consider When Choosing Best Electric Tankless Water Heaters
Choosing the right electric tankless water heater involves understanding several critical factors beyond basic specs. First, consider your household’s hot water demand—larger homes will need higher flow rates and wattages. Next, evaluate the installation space and whether the unit’s size fits your setup. Energy efficiency and control features, like digital displays or Wi-Fi connectivity, can add convenience but may increase upfront costs. Safety certifications such as ETL or UL should also be a priority to ensure reliable operation. Finally, balance your budget with the features that truly matter for your specific use case to get the best value.Flow Rate and Wattage
Flow rate determines how much hot water the unit can provide simultaneously, which is crucial for larger households or multiple fixtures. Higher wattage models generally support higher flow rates but consume more energy and may require special electrical wiring. Matching the unit’s capacity to your household’s needs prevents underperformance or unnecessary energy expenses. For small apartments, lower wattage units often suffice, but for homes with multiple bathrooms, a higher capacity model is often worth the investment.
Installation and Space Requirements
Proper installation can be a deciding factor. Compact models are ideal for tight spaces or retrofit scenarios, but they might have limited flow. Consider whether your existing electrical system can support the unit’s power requirements, especially for higher wattage options. Some units are designed for easy wall mounting and simple connections, while others may require professional wiring. Planning for proper ventilation and access to water and electrical connections helps avoid costly modifications later.
Energy Efficiency and Operating Costs
While higher wattage units often deliver better performance, they can also increase your energy bills if used continuously. Look for models with digital controls, self-modulating technology, and certifications indicating energy efficiency. Smart features like Wi-Fi enable remote monitoring and control, potentially reducing waste. However, weigh the added costs of these features against your actual needs, especially if you’re primarily heating water for a single fixture or small household.
Smart Features and Controls
Smart controls, such as Wi-Fi connectivity, can simplify managing your hot water system, especially if you want to control settings remotely or monitor usage. These features are more prevalent in higher-end models and may require app setup and maintenance. Be aware that smart features can sometimes introduce minor reliability issues or increase initial costs. If you prefer straightforward operation, models without smart controls may offer a simpler, more durable experience.
Safety Certifications and Reliability
Always prioritize units with safety certifications like ETL or UL, which verify the product meets safety standards. Reliable brands tend to have fewer warranty issues and better customer support, so consider reputation and user reviews. A well-certified model reduces the risk of electrical faults or leaks, providing peace of mind over its lifespan. Investing in a certified, reputable unit often pays off through better durability and safety.
Frequently Asked Questions
Can a single electric tankless water heater supply hot water for multiple fixtures at once?
Whether a single unit can handle multiple fixtures depends on its flow rate and wattage. Most small or mid-range models are designed for single-point use, like a sink or shower. Larger capacity models, typically 18kW or higher, can support multiple fixtures simultaneously, but this also requires sufficient electrical supply and proper installation. Always match the unit’s specifications with your household’s peak hot water demand to avoid cold surprises.
Are Wi-Fi enabled electric tankless water heaters worth the extra cost?
Wi-Fi models offer the convenience of remote control, monitoring, and adjustment, which can be useful for busy households or those wanting to optimize energy use. However, they generally come at a higher price and may introduce complexity in setup or maintenance. If you value remote access and smart home integration, these features can justify the added cost, but for straightforward needs, simpler units may suffice and prove more reliable over time.
How do I know if my electrical system can support a high-wattage electric tankless water heater?
High-wattage units, such as 18kW or 24kW models, often require dedicated 240V circuits with sufficient amperage (usually 50-60 amps). It’s essential to have your electrical panel inspected by a qualified electrician to confirm capacity and whether any upgrades are necessary. Not meeting electrical requirements can lead to circuit overloads or system failures, so proper assessment is key before purchasing a powerful model.
What maintenance is required for electric tankless water heaters?
Electric tankless water heaters generally require minimal maintenance, but periodic flushing to prevent mineral buildup is recommended, especially in hard water areas. Checking the water filters and replacing them if necessary can help maintain performance. Also, inspecting electrical connections and safety features periodically ensures continued safe operation. Regular maintenance extends the lifespan of the unit and preserves its efficiency over time.
Is it more cost-effective to replace an existing tank water heater with an electric tankless model?
Switching from a traditional tank to an electric tankless heater can reduce standby energy losses and lower utility bills, but upfront costs are higher for installation and the unit itself. The decision depends on your hot water demand, household size, and energy rates. If your current system is aging or inefficient, upgrading to a tankless model can offer long-term savings and space savings, but it’s important to evaluate installation costs and payback period first.
