Thermomate 24 kW Electric Tankless Water Heater Alternatives: 6 Similar Picks Compared
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The Thermomate 24 kW Electric Tankless Water Heater offers precise temperature control and indoor safety certifications. If you are searching for thermomate 24 kw electric tankless water heater alternatives, you might want a different size or feature set. This unit provides a flow rate up to 5.90 GPM and adjustable settings from 80°F to 140°F. However, you may need a model with smart connectivity or a more compact footprint for your specific installation space.
We selected 6 similar picks because their specifications overlap with the original product. Each alternative shares the 24 kW power rating but differs in dimensions, voltage requirements, or control interfaces. Some options include WiFi capabilities for remote management, while others prioritize manual precision or digital displays. This list helps you compare electric tankless heaters that match your electrical capacity and hot water needs. You can find a unit that fits your home’s infrastructure without compromising on essential performance metrics.
Comparing 6 Similar 24 kW Heaters
Rheem 24 kW Electric Tankless Water Heater
The Rheem RTEX-24 shares the same 24 kW wattage and 240V requirement as the Thermomate. It targets whole-house use with a slim profile measuring 14.5 inches wide and only 3.5 inches deep. This makes it easier to mount in tight spaces than the Thermomate’s 13-inch cube. Both offer precise temperature control. The Rheem is ideal if you need a lower-profile unit for indoor installation. It sacrifices the Thermomate’s specific ETL listing mention for a broader whole-house reputation. Choose this if wall space is limited.
Stiebel Eltron Tempra 24 Trend Water Heater
The Stiebel Eltron Tempra 24 Trend is a white unit that matches the 24 kW power draw. It is notably deeper at 4.63 inches but shorter in height at 14.5 inches. This shape suits homes with strong electrical infrastructure. It offers quiet, reliable performance similar to the Thermomate. However, it lacks the explicit 1-degree increment control detail found in the Thermomate’s features. It is a solid choice for those who value brand reliability and compact depth. Pick this if you prefer a shorter unit that fits under cabinets.
Westinghouse 24kW WiFi Tankless Water Heater
The Westinghouse model adds WiFi connectivity, a feature the Thermomate does not list. It also requires a 100A circuit, which is a higher electrical demand than the Thermomate’s standard setup. It shares the same 24 kW output and compact 13-inch width. This unit is best for smart home users who want app management. It gives up the simplicity of the Thermomate’s dial control for digital convenience. Choose this if you have the electrical capacity and want remote monitoring capabilities for your whole-house setup.
SIVUATEK 24 kW Point-of-Use Tankless Water Heater
The SIVUATEK unit is designed for point-of-use applications rather than whole-house heating. It shares the 24 kW wattage but targets a single fixture. It is slightly taller at 17.3 inches and black in color. This model is ideal for buyers who need instant hot water for one sink or shower. It requires a 40A circuit, which is specific to its point-of-use design. It lacks the whole-house flow capacity of the Thermomate. Pick this if you only need to heat water for a specific location rather than an entire home.
Camplux 24 kW Electric Tankless Water Heater
The Camplux TEW24 features a digital display for precise temperature monitoring, similar to the Thermomate’s adjustable display. It is very narrow at only 3.12 inches deep. This slim profile makes it easy to install in tight spaces. It shares the 24 kW power rating and 240V requirement. The Camplux focuses on efficiency and digital control. It is ideal for buyers who want to see exact temperatures on a screen. Choose this if you prioritize a digital interface and a very shallow mounting depth over other features.
Fogatti 24 kW Electric Tankless Water Heater
The Fogatti model offers precise manual temperature control, mirroring the Thermomate’s dial approach. It is extremely narrow at only 3.9 inches wide and deep. This compact design is perfect for space-saving installations. It shares the 24 kW output and whole-house intent. The Fogatti gives up smart features for straightforward manual operation. It is ideal for buyers who want exact temperature settings without digital complexity. Pick this if you need a very narrow unit that fits in tight corners while maintaining whole-house performance.
Quick picks
Our 7 picks
Thermomate 24 kW Electric Tankless Water Heater
Best for: Indoor use with precise temperature control
- Fuel Type
- Electric
- Flow Rate
- Up to 5.90 GPM
- Wattage
- 24 kW
- Installation Location
- Indoor
- Voltage
- 240 Volts
- Temperature Control
- 80°F to 140°F, 1° increment
View on Amazon: Thermomate 24 kW Electric Tankless Water Heater Affiliate link
The Thermomate 24kW electric tankless water heater delivers up to 5.90 GPM at 240 volts. It features precise temperature control from 80°F to 140°F in 1° increments. The unit includes ETL certification and overheating protection. It is designed for indoor installation. This model suits households needing reliable whole-house hot water with adjustable settings.
Pros
- Self-modulating power control for efficiency
- Precise 1° temperature adjustment increments
- ETL certified for safety
- Automatic heating stop when no water flows
Cons
- Flow rate of 5.90 GPM is lower than some 24kW competitors
- Indoor installation only
- Dial control instead of digital interface
Good fit if
- You need precise temperature settings in 1° increments
- You require ETL certification for safety
- You have a 240V electrical supply
Skip if
- You need outdoor installation capability
- You require a flow rate above 6.0 GPM
- You prefer WiFi connectivity
Verdict: Thermomate 24kW Electric Tankless Heater offers precise control and safety certifications for indoor use. It fits buyers who prioritize exact temperature settings and certified reliability over maximum flow rate.
Rheem 24 kW Electric Tankless Water Heater
Best for: Precise temperature control in whole-house setups
- Flow Rate
- 5.9 GPM
- Wattage
- 24 kW
- Voltage
- 240 V
- Temperature Control
- 80°F - 140°F, 1-degree increments
- Dimensions
- 14.5 in W x 18.3 in L x 3.5 in H
- Fuel Type
- Electric
View on Amazon: Rheem 24 kW Electric Tankless Water Heater Affiliate link
The Rheem RTEX-24 delivers 5.9 GPM at 24 kW. Its 14.5 by 18.3 by 3.5 inch frame saves space. Digital controls adjust temperature in 1-degree steps. You need three 40-amp breakers and #8 AWG wiring. This unit suits whole-house needs where precise heat settings matter. It offers reliable on-demand performance without venting requirements.
Pros
- High flow rate of 5.9 GPM
- Precise digital temperature control in 1-degree increments
- Compact design saves significant floor space
- No venting required for installation
Cons
- Requires three separate 40-amp double-pole breakers
- Needs three sets of #8 AWG copper conductors
- Limited to 240V single-phase power
Good fit if
- You need precise temperature adjustments for multiple fixtures
- You have the electrical capacity for three 40-amp breakers
- You want a compact unit that saves space
Skip if
- You cannot install three 40-amp double-pole breakers
- Your electrical panel is smaller than 200 amps
- You prefer simpler wiring with fewer conductors
Verdict: Rheem RTEX-24 24kW Electric Tankless Heater fits homes with strong electrical systems. It provides precise heat control for whole-house use. You get reliable performance without venting complexity.
Stiebel Eltron Tempra 24 Trend Water Heater
Best for: homes with strong electrical infrastructure
- Fuel Type
- Electric
- Wattage
- 24 kW
- Voltage
- 240 V
- Temperature Control
- 68° to 140°F
- Dimensions
- 14.5 x 16.6 x 4.63 in
- Use
- Whole House
View on Amazon: Stiebel Eltron Tempra 24 Trend Water Heater Affiliate link
The Stiebel Eltron Tempra 24 Trend delivers 24 kW of heating power at 240V. It produces continuous hot water with a digital display and silent operation. The unit measures 14.5 x 16.6 x 4.63 inches and weighs 16.1 pounds. It offers an output temperature range of 68°F to 140°F. This model suits you if you need reliable whole-house heating without venting. It requires a minimum 150 A electric service.
Pros
- 24 kW output for consistent hot water flow
- Compact dimensions of 14.5 x 16.6 x 4.63 inches
- Silent electronic operation with no moving parts
- Digital temperature display for precise control
Cons
- Requires a high 150 A electrical service
- Only 3-year parts warranty coverage
- No Wi-Fi or smart home connectivity listed
Good fit if
- You have a dedicated 150 A electrical panel
- You want a silent, compact unit for whole-house use
- You prefer solid copper heating elements
Skip if
- You only have a 100 A electrical service
- You need Wi-Fi remote control capabilities
- You want a longer parts warranty than 3 years
Verdict: Stiebel Eltron Tempra 24 Trend Electric Heater is a solid choice for homeowners with ample electrical capacity who value quiet, reliable performance. It fits those who need precise temperature control without the bulk of a traditional tank.
Westinghouse 24kW WiFi Tankless Water Heater
Best for: Smart home integration and compact wall mounting
- 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
The Westinghouse 24kW unit delivers 5.55 GPM of hot water at 240V. It connects to Wi-Fi for app or voice control via Alexa and Google Home. The compact 17.1-inch height and 17-pound weight make it easy to mount flush against a wall. It requires a 100A breaker and 8 AWG wire. This model suits homes needing smart connectivity and efficient whole-house heating.
Pros
- Provides 5.55 GPM flow rate for simultaneous use
- Integrates with Wi-Fi, Alexa, and Google Home
- Compact dimensions of 17.1 x 13 x 4.3 inches
- Lightweight at 17 pounds for easy wall mounting
Cons
- Requires a high 100A electrical breaker
- Minimum starting flow rate of 0.79 GPM
- Uses 8 AWG wiring for safe operation
Good fit if
- You want remote temperature control via an app
- You have a 100A breaker available for installation
- You need a compact unit for tight spaces
Skip if
- You cannot install 8 AWG wiring
- You lack space for a 100A circuit breaker
- You prefer a unit with a lower flow requirement
Verdict: Westinghouse 24kW WiFi Electric Heater offers smart control and strong flow for modern homes. It fits buyers who value app management and have the electrical capacity for a 100A circuit.
SIVUATEK 24 kW Point-of-Use Tankless Water Heater
Best for: single fixture point-of-use hot water
- Fuel Type
- Electric
- Wattage
- 24 kW
- Voltage
- 240V
- Certification
- ETL
- Dimensions
- 17.3 x 12.2 x 12.2 inches
- Use
- Whole House
View on Amazon: SIVUATEK 24 kW Point-of-Use Tankless Water Heater Affiliate link
The SIVUATEk 24kW unit delivers instant hot water for point-of-use applications. It features a compact 17.3-inch height and 20-pound weight, making it easy to mount near sinks or showers. The 240V, 24kW system modulates power based on flow rate to maintain temperature. ETL certification ensures safety for residential or light commercial use. It suits buyers needing efficient, space-saving heating for specific fixtures.
Pros
- 24kW heating power for instant hot water
- Compact 17.3 x 12.2 x 12.2 inch design
- ETL listed for safety compliance
- 99.8% energy efficiency rating
- Separate water and electrical lines in chamber
Cons
- Limited to point-of-use installation only
- Requires 40A double pole circuit breaker
- No digital display or smart controls listed
Good fit if
- You need hot water for a single sink or shower
- You have limited wall space for installation
- You want ETL certified safety for residential use
Skip if
- You need whole-house hot water supply
- You cannot install a 40A double pole breaker
- You require remote or app control features
Verdict: SIVUATEK 24kW Electric Tankless Heater is a compact, efficient solution for point-of-use heating. It fits buyers who need instant hot water for a single fixture and have the electrical capacity for a 40A circuit.
Camplux 24 kW Electric Tankless Water Heater
Best for: Digital temperature monitoring
- Fuel Type
- Electric
- Wattage
- 24kW
- Voltage
- 240 Volt
- Temperature Control
- 80℉ to 140℉
- Certification
- ETL
- Dimensions
- 17.12 x 13.12 x 3.12 inches
View on Amazon: Camplux 24 kW Electric Tankless Water Heater Affiliate link
The Camplux TEW24 is a 24kW, 240V electric tankless water heater designed for on-demand hot water. It features a digital display to monitor current temperature and includes a small red light to indicate heating status. The unit measures 17.12 x 13.12 x 3.12 inches and weighs 20.3 pounds. It offers self-modulating technology for 99.8% efficiency and separates heating elements from the water pipe to reduce scale buildup. It is ETL certified and suitable for whole-house use.
Pros
- Digital display shows current water temperature
- Self-modulating technology provides 99.8% efficiency
- ETL certified for safety standards
- Heating elements separated from water pipe to reduce scale
Cons
- Maximum output temperature is 140°F
- Requires 3 x 8AWG wire gauge
- Minimum activation flow is 0.66 GPM
Good fit if
- You need a digital display to monitor water temperature
- You want a compact unit with 24kW power
- You prefer ETL certified safety features
Skip if
- You require an output temperature above 140°F
- You cannot install 3 x 8AWG wiring
- You need a flow rate higher than 0.66 GPM for activation
Verdict: Camplux TEW24 24kW Electric Tankless Water Heater fits buyers who value precise temperature monitoring via its digital display and high efficiency. It is ideal for those who can accommodate its specific electrical requirements and temperature limits.
Fogatti 24 kW Electric Tankless Water Heater
Best for: precise manual temperature control
- Fuel Type
- Electric
- Flow Rate
- Max 6.0 GPM
- Wattage
- 24 kW
- Voltage
- 240V
- Temperature Control
- 86–140°F, ±1°F
- Certification
- ETL
View on Amazon: Fogatti 24 kW Electric Tankless Water Heater Affiliate link
The Fogatti 24kW electric tankless water heater delivers up to 6.0 GPM for whole-house use. It operates at 240V with 98% efficiency. The unit features an LED display and knob controls for precise temperature settings in 1°F increments from 86°F to 140°F. Its compact 17.1 x 12.9 x 3.9 inch design mounts easily on walls. ETL certification ensures safety with overheat and leak protection.
Pros
- High 98% energy efficiency rating
- Precise 1°F temperature increment control
- Compact wall-mountable dimensions
- ETL certified for safety
Cons
- Requires 0.5 GPM minimum flow to activate
- Flow rate drops significantly in colder inlet temperatures
- Manual knob controls only
Good fit if
- You need precise temperature adjustments
- You have limited wall space for installation
- You want ETL certified safety features
Skip if
- You require smart app connectivity
- You live in a region with very cold inlet water
- You prefer digital touch interfaces
Verdict: Fogatti 24kW Electric Tankless Heater offers precise manual control and compact sizing for whole-home hot water needs. It suits buyers who prioritize exact temperature settings and space-saving design over smart features.
Specifications side by side
| Spec | Thermomate 24 kW Electric Tankless Water Heater | Rheem 24 kW Electric Tankless Water Heater | Stiebel Eltron Tempra 24 Trend Water Heater | Westinghouse 24kW WiFi Tankless Water Heater | SIVUATEK 24 kW Point-of-Use Tankless Water Heater | Camplux 24 kW Electric Tankless Water Heater | Fogatti 24 kW Electric Tankless Water Heater |
|---|---|---|---|---|---|---|---|
| Fuel Type | Electric | not stated | Electric | Electric | Electric | Electric | Electric |
| Flow Rate | Up to 5.90 GPM | 5.9 GPM | not stated | Max 5.55 GPM | not stated | not stated | Max 6.0 GPM |
| Wattage | 24 kW | 24 kW | 24 kW | 24 kW | 24 kW | 24kW | 24 kW |
| Installation Location | Indoor | not stated | not stated | not stated | not stated | not stated | not stated |
| Voltage | 240 Volts | 240 V | 240 V | 240V | 240V | 240 Volt | 240V |
| Temperature Control | 80°F to 140°F, 1° increment | 80°F - 140°F, 1-degree increments | 68° to 140°F | not stated | not stated | 80℉ to 140℉ | 86–140°F, ±1°F |
| Certification | ETL | not stated | not stated | ETL | ETL | ETL | ETL |
| Dimensions | 16.9 x 13 x 13 inches | 14.5 in W x 18.3 in L x 3.5 in H | 14.5 x 16.6 x 4.63 in | 17" x 13" x 4.3" | 17.3 x 12.2 x 12.2 inches | 17.12 x 13.12 x 3.12 inches | 17.1 x 12.9 x 3.9 in |
| Use | Whole House | Whole House | Whole House | Whole House | Whole House | not stated | Whole House |
| Features | not stated | not stated | not stated | WiFi | not stated | Digital Display | not stated |
| Weight | not stated | 17.8 pounds | 16.1 pounds | 17 pounds | 20 pounds | 20.3 pounds | not stated |
| Color | Gray | Gray | White | Gray 24 | Black | White | Gray 24 |
| Model | ET240 | RTEX-24 | 24 Trend | WET-24K-G | V7B-240B | TEW24-CA | ET24 |
| Size | not stated | not stated | 24 (kW) | L-24 | L-24 | 240V/24kW | L-24 |
If you want different capacities or flow rates, compare the best electric tankless water heaters using their published specifications.
Frequently asked questions
Which alternative offers WiFi connectivity for remote control?
The Westinghouse 24kW WiFi Tankless Water Heater includes built-in WiFi features. This allows you to manage the unit via a smart home app. It provides whole-house heating capacity with 24 kW of power. The model WET-24K-G requires a 100A electrical circuit for proper operation. It measures 13 inches wide and 17.1 inches high.
Is there a model with a digital display for temperature monitoring?
Yes, the Camplux TEW24-CA Electric Tankless Water Heater features a digital display. This screen lets you monitor the exact water temperature in real time. It delivers 24 kW of heating power on a 240V circuit. The unit is compact, measuring only 3.12 inches deep. It is designed for buyers who want precise temperature visibility.
What is the smallest footprint among these 24 kW options?
The Fogatti ET24 has one of the most compact designs. It measures just 3.9 inches in width and depth, while standing 17.1 inches tall. This vertical profile saves wall space in tight installations. It provides 24 kW of power for whole-house needs. The gray unit offers precise manual temperature control without digital interfaces.
Can I use these units for point-of-use applications?
The SIVUATEK V7B-240B is specifically designed for point-of-use heating. It is ideal for supplying instant hot water to a single fixture. The unit delivers 24 kW of power on a 240V circuit. It requires a 40A electrical circuit for safe operation. The black model measures 12.2 inches wide and 17.3 inches high.
Which heater is best for whole-house setups with strong electrical systems?
The Rheem RTEX-24 is built for whole-house use with strong electrical infrastructure. It provides 24 kW of power at 240V. The unit features a slim profile that is only 3.5 inches deep. It measures 14.5 inches wide and 18.3 inches long. This design aids in mounting while delivering reliable performance for multiple outlets.
Is there a quiet option from a known brand?
The Stiebel Eltron Tempra 24 Trend is noted for quiet, reliable performance. It is a solid choice for homes with ample electrical capacity. The unit provides 24 kW of power at 240V. It measures 16.6 inches wide and 14.5 inches high. The white model offers precise temperature control without the bulk of traditional tank heaters.