If you’re searching for a tankless water heater with Wi Fi control, you’re likely seeking a solution that combines energy efficiency with smart home connectivity. The Westinghouse WiFi Tankless Water Heater 24kW stands out as the best overall choice for its reliability and features. For those prioritizing compact size, the Westinghouse 6.5kW Tankless Electric Water Heater offers excellent control in tight spaces. Meanwhile, the MIZUDO 120,000 BTU Gas Tankless Heater appeals to users wanting a gas-powered option with smart app integration. Keep in mind, tradeoffs often include higher upfront costs, installation complexity, or limited compatibility with existing systems. Continue reading for a detailed comparison to find the ideal fit for your needs.
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Key Takeaways
- The top picks excel in app usability and reliable Wi Fi connectivity, making remote control straightforward.
- Gas-powered models like MIZUDO offer higher capacity but tend to be bulkier and more complex to install than electric options.
- Compact electric models prioritize space-saving design but may have lower flow rates suitable for small households.
- ETL and UL certifications remain essential for safety and compliance, especially with Wi Fi-enabled appliances.
- Price and features vary widely; investing in higher wattage units generally provides greater hot water capacity but at increased cost.
| Westinghouse Tankless Electric Water Heater 14kW, Wi-Fi, 240V, Compact |  | Best for Small Spaces and Easy Remote Control | Power: 14kW | Voltage: 240V | Flow Rate: 2.0 – 3.4 GPM | VIEW ON AMAZON | See Our Full Breakdown |
| Westinghouse 18kW Electric Tankless Water Heater, Wi-Fi, Compact, Whole House |  | Best for Whole-House Hot Water in Small Spaces | Power Source: Hard Wiring Required | Wattage: 18 KW | Voltage: 240V | VIEW ON AMAZON | See Our Full Breakdown |
| 27kW Tankless Water Heater Electric 240V WiFi ETL Certified |  | Best for Continuous Hot Water with High Capacity | Power Source: Electric/AC | Wattage: 27,000 watts | Voltage: 240 volts | VIEW ON AMAZON | See Our Full Breakdown |
| MIZUDO 120,000 BTU Natural Gas Tankless Water Heater with WiFi & App Control |  | Best for Large, Versatile Space and High Power | BTU: 120,000 | Flow Rate: 5.1 GPM | Installation Options: Indoor and Outdoor | VIEW ON AMAZON | See Our Full Breakdown |
| 18kW Electric Tankless Water Heater 240V WiFi |  | Best for Moderate Demand and Space Saving | Power: 18KW | Voltage: 240V | Maximum Hot Water Output: 4.3 GPM | VIEW ON AMAZON | See Our Full Breakdown |
| 12kW Tankless Electric Water Heater WiFi 240V ETL Certified |  | Best for Compact Spaces and Point-of-Use Applications | Power Source: Electric/AC | Wattage: 12,000 watts | Voltage: 240 volts | VIEW ON AMAZON | See Our Full Breakdown |
| Westinghouse 6.5kW Tankless Electric Water Heater with WiFi Control |  | Best for Single Fixture Use and Under-Sink Installations | Power: 6.5kW | Voltage: 240V | Dimensions: 6.9”x8.1”x2.5” | VIEW ON AMAZON | See Our Full Breakdown |
| 18kW Tankless Electric Water Heater with WiFi, ETL Certified |  | Best for Moderate to High Demand in Small to Medium Homes | Power: 18kW | Voltage: 240V | Flow Rate: up to 4.3 GPM | VIEW ON AMAZON | See Our Full Breakdown |
| Westinghouse WiFi Tankless Water Heater Electric 24kW 240V |  | Best for Whole-House Hot Water with High Flow Rate | Power: 24kW | Voltage: 240V | Flow Rate: 5.55 GPM | VIEW ON AMAZON | See Our Full Breakdown |
| tankless water heater with wi fi control | Voltage | Flow Rate | Dimensions | Power |
|---|---|---|---|---|
| Westinghouse Tankless Electric | 240V | 2.0 – 3.4 GPM | 12.8 x 3.58 x 8.9 inches | 14kW |
| Westinghouse 18kW Electric Tan | 240V | 4.2 GPM | — | — |
| 27kW Tankless Water Heater Ele | 240 volts | 6.5 GPM | — | — |
| MIZUDO 120,000 BTU Natural Gas | — | 5.1 GPM | — | — |
| 18kW Electric Tankless Water H | 240V | — | 11.1 x 19.2 x 4 inches | 18KW |
| 12kW Tankless Electric Water H | 240 volts | 2.8 gpm | 9.3"W x 15"H | — |
| Westinghouse 6.5kW Tankless El | 240V | — | 6.9”x8.1”x2.5” | 6.5kW |
| 18kW Tankless Electric Water H | 240V | up to 4.3 GPM | 15.9" H x 13" W x 4.2" D | 18kW |
| Westinghouse WiFi Tankless Wat | 240V | 5.55 GPM | 17" H × 13" W × 4.3" D | 24kW |
More Details on Our Top Picks
Westinghouse Tankless Electric Water Heater 14kW, Wi-Fi, 240V, Compact
This compact model stands out for its ability to deliver instant hot water in tight areas like under sinks or in RVs, thanks to its 14kW power and small footprint. Unlike the larger 18kW units, it’s ideal for single-point use rather than whole-house applications. Its Wi-Fi integration allows precise temperature adjustments via app, but it requires professional installation and a compatible electrical panel. While its flow rate is modest—around 2.0 to 3.4 GPM—it’s perfect for small demands and quick hot water access. Compared to larger models like the 27kW heater, it sacrifices flow capacity for space efficiency, making it less suitable for larger households or multiple outlets.
Pros:- Instant hot water with faster heating
- Remote temperature control via Wi-Fi app
- Compact size suitable for tight spaces
- ETL-certified with safety protections
Cons:- Professional installation recommended
- Flow rate varies with inlet temperature
Best for: Apartment dwellers, RV owners, or anyone needing hot water at a single fixture with limited space
Not ideal for: Large families or homes with multiple simultaneous hot water demands, due to its limited flow rate
- Power:14kW
- Voltage:240V
- Flow Rate:2.0 – 3.4 GPM
- Temperature Range:86–140°F
- Dimensions:12.8 x 3.58 x 8.9 inches
- Installation Requirements:240V / 59A / 1/2″ NPT
Our verdict“This model is perfect for small-scale use where space is limited and remote control convenience is a priority.”
Westinghouse 18kW Electric Tankless Water Heater, Wi-Fi, Compact, Whole House
The 18kW model offers a significant upgrade over smaller units, with a higher flow rate of around 4.2 GPM, making it suitable for entire small to medium-sized homes. Its Wi-Fi compatibility with Alexa and Google Home allows remote adjustments, similar to the 14kW unit but with greater capacity. Compared to the 14kW model, it handles multiple outlets better but still requires professional wiring—specifically a 240V/75A connection. Its compact design helps it fit in tight spaces, but its flow rate can still fluctuate based on inlet water temperature, and it’s less capable for larger households with high simultaneous demand.
Pros:- High flow rate suitable for whole-house use
- Wi-Fi app control compatible with smart home devices
- Compact size fits in tight spaces
- ETL certified with safety protections
Cons:- Requires professional installation
- High electrical demand may impact existing wiring
Best for: Homeowners seeking whole-house hot water with smart control in limited-space settings
Not ideal for: Large households with high simultaneous hot water needs or homes with inadequate electrical service
- Power Source:Hard Wiring Required
- Wattage:18 KW
- Voltage:240V
- Flow Rate:4.2 GPM
- Maximum Temperature:140°F
- Certifications:ETL Certified
Our verdict“This pick makes the most sense for small homes needing reliable, remotely controlled hot water with minimal space requirements.”
27kW Tankless Water Heater Electric 240V WiFi ETL Certified
The 27kW model delivers impressive hot water flow—up to 6.5 GPM—making it well-suited for larger households or those with multiple fixtures running simultaneously. Its self-modulating technology improves energy efficiency, and the Wi-Fi control offers remote temperature adjustments and real-time monitoring, similar to smaller units but with a higher capacity. Compared to the 18kW unit, it handles more outlets and higher demand, but it comes with a higher power draw that can impact your household’s electrical system. Installation demands professional setup due to its high wattage and specific electrical needs, limiting its suitability for homes with limited capacity.
Pros:- Provides continuous hot water with stable temperature
- Remote Wi-Fi control and app monitoring
- High flow rate supports multiple outlets
- Energy-efficient self-modulating technology
Cons:- Requires significant electrical capacity and professional installation
- High power consumption could increase utility costs
Best for: Large families or busy households needing continuous hot water at multiple points
Not ideal for: Small apartments or homes with limited electrical capacity, due to high power requirements
- Power Source:Electric/AC
- Wattage:27,000 watts
- Voltage:240 volts
- Flow Rate:6.5 GPM
- Maximum Temperature:140°F
- Special Features:LED Display, Self-Modulating, WiFi
Our verdict“Ideal for large households demanding high flow and remote control, provided electrical setup is sufficient.”
MIZUDO 120,000 BTU Natural Gas Tankless Water Heater with WiFi & App Control
The MIZUDO model offers a robust 120,000 BTU, supporting around 5.1 GPM, making it suitable for large households or multiple simultaneous uses. Its flexible indoor/outdoor installation options add to its appeal, especially for properties with limited indoor space or outdoor venting. Wi-Fi and app control allow remote management similar to electric models but with the added benefit of high power output. Compared to electric units, it’s more versatile for larger demand, but outdoor installation requires additional accessory kits and venting considerations, which may complicate setup. Its CSA certification ensures safety, but professional installation is strongly recommended for proper venting and electrical connections.
Pros:- Flexible indoor and outdoor installation
- Remote control via WiFi and mobile app
- High power output supports large demand
- Certified for safety and reliability
Cons:- Requires purchase of outdoor installation accessories
- Venting and setup can be complex
Best for: Large households needing high power with outdoor or flexible installation options
Not ideal for: Small homes or those without outdoor space, due to outdoor setup requirements
- BTU:120,000
- Flow Rate:5.1 GPM
- Installation Options:Indoor and Outdoor
- WiFi Control:Yes
- Safety Certifications:CSA
Our verdict“Best suited for large households with outdoor space and high hot water demand, with professional installation required.”
18kW Electric Tankless Water Heater 240V WiFi
This 18kW electric model balances capacity and size, offering around 4.3 GPM, making it suitable for average-sized homes with moderate hot water needs. Its Wi-Fi control simplifies remote temperature adjustments, similar to the 18kW Westinghouse, but with a more compact design. Its self-modulating technology improves energy efficiency, yet it still requires a dedicated 240V, 75A electrical circuit, which may limit installation options in some homes. Compared to the 14kW unit, it supports higher flow but isn’t designed for homes with high simultaneous demand, such as multiple bathrooms running at once.
Pros:- Provides continuous hot water without preheating
- Energy-efficient self-modulating technology
- Space-saving design fits small to medium homes
- WiFi control for remote adjustments
Cons:- Requires professional electrical setup
- Flow rate may not satisfy high-demand households
Best for: Homes with moderate hot water use seeking space-efficient, remotely controllable options
Not ideal for: High-demand households needing multiple outlets simultaneously, due to flow limitations
- Power:18KW
- Voltage:240V
- Maximum Hot Water Output:4.3 GPM
- Dimensions:11.1 x 19.2 x 4 inches
- Water Connection:3/4″ NPT
- Amperage:75A
Our verdict“Great for moderate use in smaller homes where space and remote control are priorities.”
12kW Tankless Electric Water Heater WiFi 240V ETL Certified
This model stands out for its space-saving wall-mounted design and smart WiFi control, making it ideal for small points of use like sinks or small bathrooms. Compared with larger units like the Westinghouse 24kW, it offers less hot water flow—only 2.8 GPM—so it’s better suited for single fixtures rather than whole-house heating. Its self-modulating technology helps save energy, but the limited flow rate means it can’t support multiple simultaneous uses. The simple installation and safety protections are attractive, but the electrical setup is more demanding than basic models, requiring specific wiring and breakers. Overall, this pick makes the most sense for homes with limited space that need targeted hot water solutions.
Pros:- Compact, space-efficient wall-mounted design
- Energy-saving self-modulating technology
- Remote WiFi control for easy temperature adjustments
Cons:- Limited hot water flow rate restricts simultaneous use
- Requires specific electrical wiring and breaker setup
Best for: Small households or individual rooms needing point-of-use hot water with remote control.
Not ideal for: Large families or homes requiring multiple fixtures simultaneously, due to its limited flow rate.
- Power Source:Electric/AC
- Wattage:12,000 watts
- Voltage:240 volts
- Flow Rate:2.8 gpm
- Maximum Temperature:140 °F
- Dimensions:9.3″W x 15″H
Our verdict“Ideal for small spaces that need precise remote-controlled hot water without the bulk of larger units.”
Westinghouse 6.5kW Tankless Electric Water Heater with WiFi Control
Designed for targeted hot water needs, this compact 6.5kW unit delivers instant hot water for a single sink or vanity, making it ideal for small spaces. Its smart WiFi app and voice control capabilities set it apart from traditional point-of-use heaters, allowing remote temperature adjustments. Compared to the larger 18kW model, this unit offers less capacity—only suitable for one fixture—so it’s not fit for showers or multiple outlets. Installation requires a professional due to its electrical demands, but its small size fits easily under most sinks. The waterproof IPX4 rating adds safety, but the limited flow limits versatility. This pick is perfect for those seeking a simple, remote-controlled hot water solution for a single point of use.
Pros:- Instant hot water for single fixtures
- Smart WiFi and voice control compatibility
- Compact size fits under most sinks
Cons:- Limited to a single fixture, not suitable for showers
- Installation requires a licensed professional
Best for: Homeowners needing under-sink hot water with remote control for one fixture.
Not ideal for: Households wanting whole-house hot water or multiple simultaneous outlets, as it’s limited to one point of use.
- Power:6.5kW
- Voltage:240V
- Dimensions:6.9”x8.1”x2.5”
- Water Temperature Range:80°F-130°F
- Waterproof Rating:IPX4
- Warranty:1 year
Our verdict“Best for individuals or small apartments needing targeted, remotely controlled hot water for one fixture.”
18kW Tankless Electric Water Heater with WiFi, ETL Certified
This 18kW model strikes a balance between capacity and space efficiency, providing hot water for 2-3 simultaneous uses. Its smart WiFi and energy-efficient self-modulating technology make it suitable for households with moderate demand. Unlike the 12kW unit, it supports higher flow rates—up to 4.3 GPM—making it more versatile for multiple fixtures. However, it requires professional installation and a dedicated electrical circuit, which can add complexity and cost. Compared to the 24kW unit, it offers less capacity but is easier to install in smaller homes. Its safety protections and digital interface enhance user experience, but flow rate may decrease under high simultaneous demand. This model works well for small families or homes with moderate hot water needs.
Pros:- Provides hot water for multiple fixtures
- Energy-efficient self-modulating technology
- Remote WiFi control with real-time monitoring
Cons:- Requires professional installation and specific electrical setup
- Flow rate may drop if multiple outlets are used at once
Best for: Families with 2-3 people needing hot water simultaneously at multiple fixtures.
Not ideal for: Large households or homes with high hot water demand, where a higher capacity unit would be necessary.
- Power:18kW
- Voltage:240V
- Flow Rate:up to 4.3 GPM
- Dimensions:15.9″ H x 13″ W x 4.2″ D
- Water Connections:3/4″ NPT
- Safety Certifications:ETL
Our verdict“Suitable for small to medium households seeking reliable, remotely controlled hot water with decent capacity.”
Westinghouse WiFi Tankless Water Heater Electric 24kW 240V
This 24kW unit is designed for larger households or homes with high hot water demand, offering up to 5.55 GPM. Its compatibility with Alexa and Google Home allows seamless remote control and monitoring, making it a standout for smart home integration. While the high power output enables it to support multiple fixtures simultaneously, it also requires a dedicated 100A breaker and precise wiring—factors that can complicate installation. Compared with the 18kW model, it delivers higher flow but at the expense of increased electrical requirements. The compact design fits into various settings, but over- or under-powering can be a concern for smaller households. This model is ideal for homeowners needing robust, whole-house hot water with remote management capabilities.
Pros:- High flow rate suitable for whole-house use
- Smart WiFi control compatible with voice assistants
- Compact design fits various installation spaces
Cons:- Requires a 100A breaker and proper wiring
- Potential overkill for small households
Best for: Large households or homes with high simultaneous hot water needs and smart home integration.
Not ideal for: Small households or apartments with minimal hot water demand, due to overcapacity and electrical requirements.
- Power:24kW
- Voltage:240V
- Flow Rate:5.55 GPM
- Starting Flow Rate:0.79 GPM
- Current:100A
- Dimensions:17″ H × 13″ W × 4.3″ D
Our verdict“Best suited for large homes that require high hot water capacity combined with smart remote control features.”
How We Picked
The products were selected based on their Wi Fi connectivity reliability, performance capacity, build quality, and user interface. We prioritized models with positive reviews regarding app stability and ease of setup, as well as those meeting safety standards like ETL or UL certification. The ranking reflects a balance of value, versatility, and how well each unit integrates into a smart home ecosystem. Additional considerations included capacity for typical household demand, energy source, and size for different installation spaces, ensuring buyers can find options suitable for various needs and budgets.Factors to Consider When Choosing Tankless Water Heater With Wi Fi Control
Choosing a tankless water heater with Wi Fi control involves balancing several factors to ensure you get a unit that fits your household needs, budget, and technical preferences. Beyond basic performance, consider how the Wi Fi features integrate with your existing smart home setup, the unit’s capacity, and ease of installation. Understanding these aspects can help avoid common pitfalls like underpowered units or overly complex setups that diminish the benefits of smart control.Capacity and Flow Rate
When selecting a tankless water heater, it’s vital to match the unit’s capacity with your household’s hot water demand. Electric models typically offer lower flow rates, suitable for small homes or point-of-use applications, while gas units often handle higher flow rates better. Overestimating capacity can lead to unnecessary costs, whereas underestimating results in inadequate hot water supply. Think about peak usage times and the number of fixtures running simultaneously to find the right balance.
Compatibility & Smart Home Integration
Not all Wi Fi control systems work seamlessly across different platforms or with existing smart home ecosystems. Verify whether the app is compatible with your smartphone, voice assistants, or home automation systems. Look for units that support common protocols like Wi Fi 2.4 GHz or 5 GHz, and check user reviews for connectivity stability. A reliable app is crucial for remote monitoring, temperature adjustments, and maintenance alerts, so prioritize models with proven app performance.
Energy Source and Efficiency
Deciding between electric and gas models impacts installation complexity and operating costs. Electric units tend to be easier to install and maintain, making them ideal for smaller homes or apartments. Gas units, while more complex, often provide higher flow rates and energy efficiency for larger households. Consider your existing infrastructure, fuel costs, and local regulations to choose the most economical and practical option.
Installation & Space Requirements
Installation complexity varies significantly between models. Compact electric units suit tight spaces and are generally easier to mount, but may have limited capacity. Gas units require venting and more extensive setup, which could increase installation costs. Measure your available space and plan for proper clearance and ventilation, especially with gas models. A unit that fits well into your space and installation setup reduces headaches and long-term maintenance issues.
Price, Warranty & Maintenance
Higher-priced units often come with better warranties, longer lifespan, and more advanced features. Cheaper models might save money upfront but could lead to higher maintenance costs or shorter service life. Always review warranty terms and consider the availability of replacement parts. Regular maintenance, such as flushing and filter checks, is necessary to keep Wi Fi features working smoothly and to extend the unit’s lifespan.
Frequently Asked Questions
Can I control my tankless water heater with Wi Fi from any device?
Most modern Wi Fi-enabled tankless water heaters support remote control via smartphone apps compatible with iOS and Android devices. As long as your device has an internet connection, you can adjust settings, check status, or schedule maintenance. Compatibility varies by model, so verify app support before purchasing. Keep in mind, a stable Wi Fi connection is essential for reliable remote operation, especially in larger homes where signal strength may vary.
Are Wi Fi features secure, or do they pose a hacking risk?
Wi Fi control features can introduce security concerns if not properly protected. Reputable brands implement encryption and password protections to safeguard your device. Always change default passwords, keep firmware updated, and use secure networks to minimize risks. Investing in a quality unit from a trusted manufacturer reduces the likelihood of vulnerabilities, but maintaining good cybersecurity practices remains important.
Is a higher wattage electric tankless water heater better?
Higher wattage units generally provide greater flow rates and can handle larger households or simultaneous fixtures more effectively. However, they also tend to cost more upfront and may require dedicated electrical circuits. If your household demand is low, a lower wattage model might suffice and save energy. Match your hot water needs with the unit’s capacity to avoid overspending on unnecessary power or ending up with insufficient hot water.
Can I install a Wi Fi tankless water heater myself?
While some electric models are designed for DIY installation, many units—especially gas-powered ones—require professional setup due to venting, electrical wiring, and safety considerations. Proper installation is critical for safety, performance, and warranty validity. If you lack experience, hiring a licensed technician ensures compliance with local codes and optimal operation. Always review the manufacturer’s installation instructions before attempting any setup.
Do Wi Fi-enabled tankless water heaters increase energy efficiency?
Yes, the ability to control and monitor your heater remotely can lead to energy savings by optimizing usage and preventing unnecessary operation. Features like scheduling or temperature alerts help avoid energy waste. However, the actual savings depend on user habits and proper setup. Investing in a high-efficiency model with smart controls can contribute to lower utility bills over time, especially in households with variable hot water needs.
Conclusion
The best overall choice for most households is the Westinghouse WiFi Tankless Water Heater 24kW, offering a solid balance of performance, smart features, and reliability. For those on a tighter budget or with limited space, the Westinghouse 6.5kW Electric Model provides effective control at a lower price point. Buyers seeking a gas-powered solution with high capacity should consider the MIZUDO 120,000 BTU Gas Heater. Beginners or small households benefit from simpler, compact electric units, while larger homes or tech enthusiasts may prefer premium models with advanced app features. Matching your specific needs and technical comfort level will help you make the best choice.Halloween Picks
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