Westinghouse Tankless Water Heater Electric vs Westinghouse Wifi Tankless Water Heater (2026): Key Differences
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This guide compares the Westinghouse tankless water heater electric vs wifi tankless water models. Both units are 240V electric heaters with smart Wi-Fi control. The main difference lies in their power and intended use. The 6.5kW model is a compact point-of-use heater for single sinks. The 11kW model offers higher capacity for showers or multiple fixtures. You should choose based on your flow rate needs and installation space.
Key differences
| Aspect | Westinghouse 6.5kW 240V Under-Sink Tankless Water Heater | Westinghouse 11kW Smart Wi-Fi Tankless Water Heater |
|---|---|---|
| Wattage | 6.5kW | 11kW |
| Max Flow Rate | Not listed | Up to 2.56 GPM |
| Temperature Range | 80–130°F | 86–140°F |
| Dimensions | 6.9 x 8.1 x 2.5 inches | 14.2 x 9.5 x 3.5 inches |
| Amperage Requirement | 30A | 46A |
| Safety Certifications | IPX4 rating | ETL certified |
Which one should you choose?
Choose Westinghouse 6.5kW 240V Under-Sink Tankless Water Heater if
- You need a heater for a single under-sink application.
- Your electrical panel only supports a 30A circuit.
- You have limited space under the sink.
Choose Westinghouse 11kW Smart Wi-Fi Tankless Water Heater if
- You require hot water for a shower or multiple points.
- You need a higher maximum flow rate.
- You have a 50A circuit available for installation.
Verdict: The 6.5kW model is best for tight spaces and single sink applications. The 11kW model is better for showers or higher demand. Choose the unit that matches your electrical capacity and flow needs.
Westinghouse 6.5kW vs 11kW Heater Comparison
Power output
The Westinghouse 6.5kW 240V Under-Sink Tankless Water Heater delivers 6.5 kilowatts of heating power. This model is designed for low-demand tasks like handwashing or dish rinsing at a single sink. In contrast, the Westinghouse 11kW Smart Wi-Fi Tankless Water Heater provides 11 kilowatts of power. This higher wattage allows it to handle more significant hot water needs, such as supporting a shower or multiple fixtures simultaneously. The 11kW unit offers substantially more heating capacity than the compact 6.5kW model.
Flow rate capacity
Flow rate determines how much hot water you get per minute. The 6.5kW unit is optimized for point-of-use sinks and does not supply enough water for showers or tubs. The 11kW model delivers up to 2.56 gallons per minute, with an activation flow of just 0.4 GPM. This higher flow rate makes the 11kW heater suitable for one shower or combined use at one to three points. The 6.5kW model is strictly limited to single sink applications due to its lower power output.
Physical dimensions
Size matters for installation space. The Westinghouse 6.5kW 240V Under-Sink Tankless Water Heater measures 6.9 by 8.1 by 2.5 inches. Its compact footprint allows it to fit easily under most standard kitchen sinks or bathroom vanities. The Westinghouse 11kW Smart Wi-Fi Tankless Water Heater is larger, measuring 14.2 inches high, 9.5 inches wide, and 3.5 inches deep. While it still mounts flush to walls, it requires more vertical and horizontal space. The 6.5kW model is the better choice for tight under-sink cabinets.
Electrical requirements
Both units require a 240V circuit, but the electrical demands differ significantly. The 6.5kW heater needs a 30-amp two-pole breaker and 10 AWG wires. The 11kW heater requires a 50-amp double-pole breaker and 8 AWG wiring, with an amperage draw of 46 amps. If your electrical panel lacks the capacity for a 50-amp circuit, the 6.5kW model is the only viable option. The 11kW unit demands a more robust electrical infrastructure to operate safely and effectively.
Temperature range
Both heaters offer precise digital control via LED displays and Wi-Fi apps. The 6.5kW model allows temperature settings from 80°F to 130°F in 1°F increments. The 11kW model offers a wider range, adjustable from 86°F to 140°F in 1°F increments. This higher maximum temperature on the 11kW unit can be beneficial in areas with very cold inlet water. Both support voice commands through Alexa and Google Home for convenient remote adjustments.
Which Westinghouse model fits your needs
Renters needing compact under-sink heat
The 6.5kW model measures just 6.9 by 8.1 by 2.5 inches. This small footprint fits easily under most kitchen sinks or bathroom vanities. It provides instant hot water for single-point use tasks like handwashing. The compact size saves valuable cabinet space while delivering reliable performance for low-demand fixtures.
Users requiring higher flow for showers
This 11kW unit delivers up to 2.56 gallons per minute. That flow rate supports simultaneous use at one shower or multiple fixtures. The higher wattage ensures consistent hot water during longer showers. You get precise temperature control from 86 to 140 degrees Fahrenheit with 1-degree increments for comfort.
Those with existing 30A electrical panels
The 6.5kW heater requires a 30A two-pole breaker and 10 AWG wires. This is easier to install in older homes with limited electrical capacity. The 11kW model needs a 50A breaker and 8 AWG wiring. If your panel cannot support 46 amps, the lower-power model is the safer choice.
Buyers wanting maximum temperature range
The 11kW model adjusts water temperature from 86 to 140 degrees Fahrenheit. The 6.5kW model only reaches up to 130 degrees. If you need higher heat for specific cleaning tasks or personal preference, the larger unit offers a wider range. Both include Wi-Fi app control and LED displays.
The products compared
Westinghouse 6.5kW 240V Under-Sink Tankless Water Heater
Best for: Single sink point-of-use hot water
- Fuel Type
- Electric
- Wattage
- 6.5 kW
- Voltage
- 240V
- Temperature Control
- 80–130°F, 1°F increments
- Dimensions
- 6.9 x 8.1 x 2.5 inches
- Use
- Under Sink
View on Amazon: Westinghouse 6.5kW 240V Under-Sink Tankless Water Heater Affiliate link
This Westinghouse unit delivers 6.5kW of power at 240V for instant hot water at a single sink. It features Wi-Fi app control and an LED display for precise temperature settings between 80–130°F. The compact 6.9 x 8.1 x 2.5-inch design fits under most vanities. It is ideal for point-of-use applications like handwashing or dish rinsing, rather than whole-house or shower needs.
Pros
- Wi-Fi app control with Alexa and Google Home compatibility
- Precise temperature adjustment in 1°F increments from 80–130°F
- Compact dimensions fit under most standard sinks
- Includes six safety protections like anti-scald and dry-fire prevention
Cons
- 6.5kW output is insufficient for showers or tubs
- Requires a dedicated 30A two-pole breaker and 10 AWG wiring
- Limited to single point-of-use installation
Good fit if
- You need hot water for a single kitchen sink or bathroom vanity
- You want remote monitoring and scheduling via a smartphone app
- You have the required 240V electrical circuit available
Skip if
- You need to supply hot water for a shower or bathtub
- You require a whole-house hot water solution
- You cannot install a dedicated 30A circuit with 10 AWG wire
Verdict: Westinghouse 6.5kW Electric Tankless is a smart, compact solution for single sinks. It fits buyers who want app control and precise heat settings for vanity use, not those needing shower capacity.
Westinghouse 11kW Smart Wi-Fi Tankless Water Heater
Best for: Smart home users needing 11 kW power
- Fuel Type
- Electric
- Flow Rate
- 2.56 GPM
- Wattage
- 11kW
- Voltage
- 240V
- Temperature Control
- 86°F to 140°F, ±1°F
- Certification
- ETL
View on Amazon: Westinghouse 11kW Smart Wi-Fi Tankless Water Heater Affiliate link
This Westinghouse unit delivers 11 kW of power at 240V, providing up to 2.56 GPM for one shower. It features WiFi control via app or voice commands, allowing precise temperature adjustments from 86°F to 140°F. The compact design measures 14.2 inches high and weighs 10 pounds. It requires a 50-amp breaker and 8 AWG wiring. This model suits users needing smart connectivity and reliable instant hot water for a single point of use.
Pros
- 11 kW output provides up to 2.56 GPM flow rate
- WiFi app and voice control for remote temperature adjustment
- ETL certified with 4-layer safety protection
- Compact dimensions of 14.2 inches high by 9.5 inches wide
Cons
- Requires 50-amp double-pole breaker and 8 AWG wiring
- Limited to single-point use or one shower
- Higher amperage draw than 6.5 kW models
Good fit if
- You need precise temperature control via smartphone
- You have a 50-amp electrical circuit available
- You want voice assistant integration for your home
Skip if
- You only have a 40-amp circuit breaker
- You need to supply hot water to multiple showers simultaneously
- You prefer a simpler unit without smart features
Verdict: Westinghouse WiFi 11kW 240V Electric is ideal for homeowners with adequate electrical capacity who want remote control over their water temperature. It offers a robust 11 kW output for consistent hot water delivery.
Specifications side by side
| Spec | Westinghouse 6.5kW 240V Under-Sink Tankless Water Heater | Westinghouse 11kW Smart Wi-Fi Tankless Water Heater |
|---|---|---|
| Fuel Type | Electric | Electric |
| Flow Rate | not stated | 2.56 GPM |
| Wattage | 6.5 kW | 11kW |
| Voltage | 240V | 240V |
| Temperature Control | 80–130°F, 1°F increments | 86°F to 140°F, ±1°F |
| Certification | not stated | ETL |
| Dimensions | 6.9 x 8.1 x 2.5 inches | 14.2" x 9.5" x 3.5" |
| Use | Under Sink | not stated |
| Features | WiFi | WiFi |
| Weight | not stated | 10 pounds |
| Size | S-6.5 | S-11 |
| Color | Deep Blue | Gray 11 |
| Model | WET-6K5-D | WET-11K-G |
Frequently asked questions
Does the Westinghouse 6.5kW model support Wi-Fi control?
The provided data for the Westinghouse 6.5kW Electric Tankless Water Heater does not list Wi-Fi as a feature. It is designed as a compact, 240V unit for single sinks. The 11kW model explicitly includes Wi-Fi capabilities for remote temperature management. You should verify the specific model number WET-6K5-D for any firmware updates that might add connectivity, but standard specs do not include it.
What are the physical dimensions of the 6.5kW heater?
The Westinghouse 6.5kW unit measures 8.07 inches in width, height, and length. This cubic form factor makes it suitable for tight under-sink installations. The color is listed as Deep Blue. Its compact size allows it to fit easily into standard vanity cabinets without taking up excessive space compared to larger whole-house units.
How much does the 11kW Wi-Fi heater weigh?
The Westinghouse 11kW Smart Wi-Fi Tankless Water Heater weighs 10 pounds. This weight is manageable for wall-mounted installation in a garage or utility room. The unit measures 9.5 inches wide and 14.2 inches tall. Ensure your mounting surface can support this weight securely to prevent any strain on the plumbing connections.
Can I use the 6.5kW model for a shower?
No, the 6.5kW model is best for single sink point-of-use hot water. Its 6.5 kilowatt output is insufficient to heat water adequately for a shower. It is intended for tasks like handwashing or dish rinsing. For shower applications, you need the higher 11kW output to maintain consistent water temperature during flow.
Is the 11kW heater compatible with standard 240V outlets?
Yes, the Westinghouse 11kW Smart Wi-Fi Tankless Water Heater operates on 240V. It requires a dedicated circuit with adequate amperage to handle the 11 kW power draw. Always consult a licensed electrician to verify your home's electrical capacity before installation. This ensures safe operation and prevents tripping breakers during peak heating demand.
What is the difference between the S-6.5 and S-11 models?
The S-6.5 model refers to the 6.5kW unit, while S-11 refers to the 11kW unit. The primary difference is heating power and size. The S-6.5 is smaller and for single sinks. The S-11 is larger, heavier, and provides more hot water volume. Both use 240V electricity, but the S-11 offers smart features and higher output.