Westinghouse vs Thermomate: Tankless Water Heaters Compared by Specs
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When comparing westinghouse vs thermomate tankless water heater options, you face a choice between true on-demand heating and compact point-of-use storage. Both are electric units designed for residential use. The Westinghouse model delivers continuous hot water for whole-house applications with smart features. The Thermomate unit is a mini-tank designed specifically for under-sink installations. You need to decide if you require unlimited flow or a small, localized hot water source.
Key differences
| Aspect | Westinghouse 24kW WiFi Tankless Water Heater | Thermomate 6.5-Gallon Under-Sink Electric Mini-Tank |
|---|---|---|
| Type | Tankless | Mini-Tank |
| Use | Whole House | Under Sink |
| Voltage | 240V | 120V |
| Wattage | 24kW | 1.44kW |
| Flow Rate | 5.55 GPM | Not listed |
Which one should you choose?
Choose Westinghouse 24kW WiFi Tankless Water Heater if
- You need hot water for multiple fixtures simultaneously.
- You want to control temperature via a smartphone app.
- Your electrical panel supports 240V circuits.
Choose Thermomate 6.5-Gallon Under-Sink Electric Mini-Tank if
- You need hot water for a single sink only.
- You want to plug the unit into a standard 120V outlet.
- You prefer a compact unit with stored hot water ready instantly.
Verdict: The Westinghouse unit is the better choice for whole-house hot water needs due to its high flow rate and tankless design. The Thermomate mini-tank is suitable only for point-of-use applications like a bathroom or kitchen sink. Choose based on whether you need unlimited flow or a small, localized supply.
Specs: Westinghouse vs Thermomate
Heating type
The Westinghouse unit is a true tankless water heater. It heats water only when you turn on the tap, providing endless hot water without a storage tank. This design prevents standby energy loss. The Thermomate is a mini-tank water heater with a 6.5-gallon capacity. It stores hot water for point-of-use applications. While it offers instant access to stored water, it is not tankless. If you need continuous flow for multiple fixtures, the Westinghouse tankless design is the functional choice. The Thermomate is better suited for a single sink where storage is acceptable.
Power requirements
These units require very different electrical setups. The Westinghouse 24kW model operates on 240V and draws up to 100 amps. It requires three 40-amp double-pole breakers and 8 AWG wire. This is a high-demand installation for a whole house. The Thermomate runs on standard 120V and draws 12 amps. It plugs directly into a regular outlet using a 2-foot cord. You do not need a dedicated high-amperage circuit for the Thermomate. If your home lacks the heavy electrical infrastructure for a 24kW unit, the Thermomate is the only viable option.
Flow capacity
The Westinghouse heater provides a maximum flow rate of 5.55 GPM with a starting flow of 0.79 GPM. This supports simultaneous use in showers and sinks. The Thermomate does not list a flow rate in GPM. As a 6.5-gallon storage unit, it relies on recovery time and tank volume rather than instantaneous flow. It is designed for low-demand point-of-use tasks like hand washing. For high-volume needs, the Westinghouse tankless system delivers continuous hot water. The Thermomate will run out of hot water once the tank is depleted.
Smart features
The Westinghouse model includes built-in Wi-Fi connectivity. You can adjust the temperature and monitor usage via a mobile app or voice commands through Alexa and Google Home. This allows for remote control and integration into a smart home system. The Thermomate data does not mention any Wi-Fi, app, or smart capabilities. It uses a manual thermostat with three temperature settings ranging from 50°F to 149°F. If remote control or voice automation is important to you, the Westinghouse is the superior choice.
Physical size
The Westinghouse unit measures 17 inches high by 13 inches wide and 4.3 inches deep. It weighs 17 pounds and mounts flush against a wall. The Thermomate is larger, measuring 17.7 inches wide by 14.6 inches deep and 21.2 inches high. It weighs 26.5 pounds. While both are compact compared to traditional tanks, the Westinghouse is thinner and lighter. The Thermomate’s boxier shape may fit better in certain under-sink cabinets, but the Westinghouse offers a lower profile for wall mounting.
Choose the right heater for your needs
Whole-house users wanting smart control
You need endless hot water for multiple fixtures. The Westinghouse unit provides 5.55 GPM at 24 kW. It connects to 240V power and includes WiFi for remote temperature adjustments. This model supports simultaneous shower and sink use without running out of heat.
Apartment dwellers needing under-sink hot water
You only need hot water at one specific sink. This Thermomate mini-tank holds 6.5 gallons for immediate use. It plugs into a standard 120V outlet and measures 17.7 inches wide. The glass-lined tank retains heat efficiently for point-of-use applications like kitchens or bathrooms.
Renters avoiding electrical upgrades
You cannot install new high-voltage circuits. The Thermomate unit runs on 120V and 12 amps, fitting a standard wall outlet. It requires no professional electrician for installation. The compact design mounts easily under a sink or counter, making it ideal for rental properties with limited electrical capacity.
The products compared
Westinghouse 24kW WiFi Tankless Water Heater
Best for: Whole-house hot water with smart control
- Fuel Type
- Electric
- Flow Rate
- Max 5.55 GPM
- Wattage
- 24 kW
- Voltage
- 240V
- Certification
- ETL
- Dimensions
- 17" x 13" x 4.3"
View on Amazon: Westinghouse 24kW WiFi Tankless Water Heater Affiliate link
This Westinghouse unit delivers 24 kW of power at 240V, providing up to 5.55 GPM of hot water. It features smart Wi-Fi control for remote temperature adjustments. The compact 17 by 13 by 4.3-inch design mounts flush against the wall. It requires a 100A breaker and 8 AWG wiring. This whole-house heater suits homes needing continuous hot water for multiple fixtures.
Pros
- High 24 kW output for strong flow rates
- Smart Wi-Fi allows remote app and voice control
- Compact dimensions save floor space
- Low 0.79 GPM starting flow rate
Cons
- Requires 100A electrical circuit and 8 AWG wire
- Only available in gray color
- No dedicated physical display mentioned in specs
Good fit if
- You need whole-house hot water capacity
- You want remote temperature control via app
- You have space for a wall-mounted unit
Skip if
- You cannot install a 100A breaker
- You prefer a smaller 11 kW or 14 kW model
- You need a gas-powered heating solution
Verdict: Westinghouse 24kW Electric Tankless Heater offers high capacity and smart connectivity for whole-house needs. It fits homes with adequate electrical infrastructure seeking continuous hot water.
Thermomate 6.5-Gallon Under-Sink Electric Mini-Tank
Best for: single sink or vanity point-of-use
- Fuel Type
- Electric
- Wattage
- 1.44 kW
- Capacity
- 6.5 Gallons
- Voltage
- 120V
- Temperature Control
- 50°F to 149°F
- Certification
- UL Listed
View on Amazon: Thermomate 6.5-Gallon Under-Sink Electric Mini-Tank Affiliate link
This Thermomate unit is a 6.5-gallon electric mini tank designed for under-sink point-of-use installation. It operates on a standard 120V outlet with a 1.44 kW heating element. The glass-lined tank offers 99% thermal efficiency and includes a UL Listed safety certification. You get adjustable temperature settings from 50°F to 149°F. Its compact 17.7-inch footprint fits easily under counters, providing instant hot water for sinks without waiting for main heater recovery.
Pros
- 6.5-gallon capacity for point-of-use hot water
- Plugs into standard 120V household outlet
- UL Listed for safety compliance
- Adjustable thermostat range from 50°F to 149°F
Cons
- Lower 1.44 kW wattage limits flow rate compared to whole-house units
- Small 6.5-gallon tank requires recovery time for heavy use
- Includes only 1-year warranty for parts
Good fit if
- You need hot water for a single sink or vanity
- You have a standard 120V electrical outlet nearby
- You want a UL Listed unit for safety assurance
Skip if
- You need to supply hot water to multiple fixtures simultaneously
- You require a whole-house heating solution
- You need a higher flow rate for a shower
Verdict: Thermomate 6.5 Gallon Mini Tank is a practical solution for single-sink applications where space is tight and a 120V connection is available. It suits users who prioritize compact size and safety certifications over high-volume hot water output.
Specifications side by side
| Spec | Westinghouse 24kW WiFi Tankless Water Heater | Thermomate 6.5-Gallon Under-Sink Electric Mini-Tank |
|---|---|---|
| Fuel Type | Electric | Electric |
| Flow Rate | Max 5.55 GPM | not stated |
| Wattage | 24 kW | 1.44 kW |
| Capacity | not stated | 6.5 Gallons |
| Voltage | 240V | 120V |
| Temperature Control | not stated | 50°F to 149°F |
| Certification | ETL | UL Listed |
| Dimensions | 17" x 13" x 4.3" | 17.7"H x 17.7"W x 14.6"D |
| Use | Whole House | Under Sink |
| Features | WiFi | not stated |
| Weight | 17 pounds | 26.5 pounds |
| Size | L-24 | 6.5 Gallon |
| Color | Gray 24 | white,blue |
| Model | WET-24K-G | ES700 |
Frequently asked questions
Can the Westinghouse 24kW unit heat water for an entire house?
Yes, this model is designed for whole-house use. It delivers continuous hot water by heating water on demand rather than storing it. The 24 kW output supports multiple fixtures simultaneously, provided your home has the necessary 240V electrical infrastructure. It fits homes seeking endless hot water with smart connectivity.
Is the Thermomate 6.5-gallon heater suitable for a whole house?
No, this unit is a mini-tank designed for point-of-use applications. It is best suited for a single sink or vanity where space is tight. It provides 6.5 gallons of stored hot water, which is insufficient for whole-house demands. It connects to 120V power, making it ideal for compact residential spots.
Does the Westinghouse heater require a special electrical connection?
Yes, it requires a 240V power source. This higher voltage supports its 24 kW wattage, enabling high-capacity heating for whole-house needs. You must ensure your home has adequate electrical infrastructure to handle this load. It is not compatible with standard 120V outlets used by smaller point-of-use units.
Can I control the Westinghouse heater from my phone?
Yes, it includes WiFi connectivity. This feature allows you to adjust temperature settings remotely. You can monitor and control the unit from anywhere with an internet connection. This smart control adds convenience for managing whole-house hot water usage without needing to access the physical device.
Which heater is smaller and lighter?
The Westinghouse unit is more compact in volume and lighter in weight. It measures 13 inches wide and tall, with a height of 17.1 inches. It weighs 17 pounds. The Thermomate is larger, measuring 14.6 inches wide and 17.7 inches long, with a height of 21.2 inches. It weighs 26.5 pounds.
What is the main difference in heating technology between these two?
The Westinghouse is a true tankless heater that heats water only when you turn on the tap. This design prevents standby energy loss. The Thermomate is a mini-tank unit that stores 6.5 gallons of pre-heated water. It provides immediate hot water from the tank but relies on stored volume rather than on-demand flow.