Eemax HA008240 240V 8.0 kW Electric Tankless Water Heater Alternatives: 6 Similar Picks Compared
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If you are researching eemax ha008240 240v 8 0 kw electric tankless water heater alternatives, you likely want to compare this unit against similar models. The Eemax HA008240 is a compact electric heater with 8.0 kW output. It measures 4.5 x 14 x 18 inches and weighs just over seven pounds. This small footprint makes it suitable for tight spaces or point-of-use installations. However, you might need more power or different dimensions. Some users require higher flow rates for whole-house applications. Others may prefer a different brand or additional features like WiFi connectivity.
We selected 6 alternatives that share key specifications with the original unit. All listed heaters use 240V electric power, ensuring compatibility with standard residential circuits. The comparison includes units ranging from 8.0 kW to 18 kW. This range covers everything from single-sink heating to high-demand whole-house setups. You can review the wattage, dimensions, and weight of each option. This data helps you determine which model fits your electrical capacity and space constraints. The list highlights the best overall choice, budget-friendly options, and premium picks with smart features. Each product is evaluated based on its published specs to help you make an informed decision.
Our top pick: Eemax 8.0 kW Electric Tankless Water Heater.
How alternatives compare to Eemax
ThermoMate 14kW Electric Tankless Water Heater
The ThermoMate EH140 doubles your heating capacity with 14 kW output compared to the Eemax’s 8.0 kW. This higher wattage allows for faster recovery and slightly better performance for small households or apartments with limited electrical capacity. It shares the 240V requirement but uses a more compact footprint, measuring 11.2 x 15.9 x 11.2 inches. The unit weighs 13 pounds, making it heavier than the Eemax. You gain power and a smaller width, but you may need to verify your electrical panel can handle the increased load. It remains a practical choice for single-fixture use where the Eemax might feel underpowered.
Ranein 18kW 4.3 GPM Electric Water Heater
The Ranein RE18K significantly upgrades your hot water supply with an 18 kW output and a 4.3 GPM flow rate. This model is designed for whole-house applications rather than point-of-use scenarios. It requires dual 40 A circuits, which is a major infrastructure difference from the Eemax. The dimensions are 13.8 x 18.7 x 13.8 inches, making it wider but shallower than the Eemax. It weighs 17.4 pounds. You trade the Eemax’s compact simplicity for substantial flow capacity. This pick suits users who can install the necessary electrical infrastructure and need reliable whole-house performance without smart features.
WINTEMP 18 kW Tankless Water Heater with WiFi
The WINTEMP WN18 matches the Ranein with 18 kW power but adds WiFi connectivity for smart home integration. It shares the whole-house potential but distinguishes itself through remote control capabilities. The unit is notably slim, measuring only 4 inches in height, with dimensions of 11.1 x 4 x 19.1 inches. It weighs 12 pounds. You gain modern monitoring features and high output, but you must ensure your home has a 150-amp service. This model is ideal for buyers who want the power of an 18 kW system with the convenience of app-based control, unlike the basic operation of the Eemax.
EcoSmart 13 kW Electric Tankless Water Heater
The EcoSmart ECO 11 offers 13 kW of power, which is higher than the Eemax’s 8.0 kW, while maintaining a very small form factor. It measures 13.5 x 10 x 6.5 inches and weighs only 6.5 pounds. This makes it lighter and more compact than the Eemax, fitting well in tight spaces. It is designed for point-of-use heating in moderate climates. You get more power in a smaller package, but the flow rate is likely lower than whole-house units. This pick is best for users who need a compact upgrade for a single sink or bathroom where the Eemax might be too large or underpowered.
Orbek 18kW 240V Tankless Electric Water Heater
The Orbek HEU-ET018A5W-M0 provides 18 kW of heating power for high-demand whole-house applications. It requires a 75-amp circuit, which is a significant electrical upgrade from the Eemax. The unit features a unique square design, measuring 8 x 11 x 8 inches, which is much narrower than the Eemax. It is finished in Snow color. You gain substantial hot water capacity and a compact depth, but you must support the heavy electrical load. This model suits buyers who need strong flow rates and have the necessary infrastructure, offering a stark contrast to the Eemax’s lower-output point-of-use design.
SIVUATEK 18 kW Electric Tankless Water Heater
The SIVUATEK V7B-180B delivers 18 kW of power for high-flow needs, similar to other whole-house units. It measures 11 x 3 x 15 inches and weighs 19 pounds. The unit is black and features a very slim 3-inch depth, making it ideal for tight installations. It lacks smart features, focusing on capacity and compact depth. You trade the Eemax’s 8.0 kW output for nearly double the power, but you must ensure your electrical system can handle the load. This pick is for users who prioritize high capacity and a low-profile design over the simplicity and lower power of the Eemax.
Quick picks
Our 7 picks
Eemax 8.0 kW Electric Tankless Water Heater
Best for: single sink or bathroom point-of-use
- Fuel Type
- Electric
- Wattage
- 8.0 kW
- Voltage
- 240 V
- Dimensions
- 4.5 x 14 x 18 inches
- Weight
- 7.04 pounds
View on Amazon: Eemax 8.0 kW Electric Tankless Water Heater Affiliate link
The Eemax HA008240 is an 8.0 kW electric tankless water heater designed for point-of-use applications. It operates on a standard 240V circuit and measures 18 by 14 by 4.5 inches. Weighing just 7.04 pounds, it is lightweight and compact. This unit suits you if you need hot water for a single sink or small bathroom where space is limited.
Pros
- Compact 4.5-inch depth fits tight spaces
- Lightweight 7.04-pound build for easy mounting
- Standard 240V electrical requirement
- 8.0 kW heating output
Cons
- Lower 8.0 kW capacity limits flow rate
- No smart connectivity or app control listed
- Not suitable for whole-house hot water needs
Good fit if
- You need a compact unit for a single sink
- You have limited space behind a wall or cabinet
- You want a lightweight installation option
Skip if
- You require hot water for multiple fixtures simultaneously
- You need a whole-house water heating solution
- You prefer smart home integration features
Verdict: Eemax 8 kW Compact Electric Heater is a practical choice for you if you need reliable hot water for a single point of use in a tight space.
ThermoMate 14kW Electric Tankless Water Heater
Best for: small spaces and single-fixture use
- Fuel Type
- Electric
- Flow Rate
- 3.4 GPM
- Wattage
- 14 kW
- Installation Location
- Indoor
- Voltage
- 240 V
- Temperature Control
- 86°F to 131°F
View on Amazon: ThermoMate 14kW Electric Tankless Water Heater Affiliate link
The ThermoMate EH140 delivers up to 3.4 GPM of hot water at 14 kW. It uses a cast aluminum heating element for durability and features a digital touch control interface. The compact gray unit measures 15.9 by 11.2 by 3 inches and weighs 13 pounds. It requires a dedicated 60 Amp circuit and 6 AWG copper wiring. This model suits small homes or apartments where space is limited.
Pros
- 14 kW power output for instant hot water
- Compact dimensions of 15.9 x 11.2 x 3 inches
- Cast aluminum heating element resists scale buildup
- ETL listed for North American safety standards
Cons
- Lower flow rate than 18 kW competitors
- Requires a 60 Amp dedicated circuit
- Touch control interface may be less durable
Good fit if
- You need a compact unit for tight spaces
- You have a 60 Amp circuit available
- You want ETL certification for safety
Skip if
- You need high flow for whole-house use
- You lack space for a 60 Amp breaker
- You prefer physical knobs over touch controls
Verdict: ThermoMate 14kW Electric Tankless Heater fits small households or apartments with limited electrical capacity. It offers safe, space-efficient heating for one or two fixtures.
Ranein 18kW 4.3 GPM Electric Water Heater
Best for: high-flow whole-house electric setups
- Fuel Type
- Electric
- Flow Rate
- 4.3 GPM
- Wattage
- 18 kW
- Voltage
- 240 V
- Temperature Control
- 86°F to 131°F, 1°F increments
- Certification
- CSA
View on Amazon: Ranein 18kW 4.3 GPM Electric Water Heater Affiliate link
The Ranein 18kW unit delivers up to 4.3 GPM at 240V, supporting two to three simultaneous outlets. It features 99% thermal efficiency and precise temperature control from 86°F to 131°F in 1°F increments. This compact, wall-mounted heater suits whole-house needs where high flow is essential. Its CSA certification ensures safety standards are met for reliable daily use.
Pros
- 18 kW power output supports 2–3 outlets simultaneously
- Maximum flow rate of 4.3 GPM for whole-house use
- 99% thermal efficiency reduces standby heat loss
- Precise temperature adjustment in 1°F increments
- CSA certified for U.S. and Canadian safety standards
Cons
- Requires two dedicated 40 A double-pole breakers
- Uses two 8 AWG cables for installation
- No WiFi or smart home connectivity listed
Good fit if
- You need high flow for multiple showers
- You have the electrical capacity for 80 A total
- You want precise temperature control without app complexity
Skip if
- You only have a single 40 A circuit available
- You prefer WiFi remote control capabilities
- You need a unit smaller than 18.7 inches tall
Verdict: Ranein 18kW Electric Tankless Water Heater fits households needing strong flow and precise heat without smart features. It suits those who can install the required dual 40 A circuits and want reliable whole-house performance.
WINTEMP 18 kW Tankless Water Heater with WiFi
Best for: homes with 150-amp service and WiFi needs
- Fuel Type
- Electric
- Flow Rate
- Up to 4.3 GPM
- Wattage
- 18 kW
- Voltage
- 240V
- Certification
- ETL
- Dimensions
- 19.2 x 11.1 x 4 inches
View on Amazon: WINTEMP 18 kW Tankless Water Heater with WiFi Affiliate link
The WINTEMP WN18 is an 18 kW electric tankless water heater rated for 240 V. It delivers a maximum flow of 4.3 GPM and features WiFi connectivity for remote temperature adjustments. The unit measures 11.1 inches wide by 19.2 inches high and weighs 12 pounds. Its self-modulating technology adjusts power based on flow rate to maintain stable water temperatures. This model is ETL certified and includes safety protections against overheating and dry firing.
Pros
- 18 kW heating capacity for high flow rates
- WiFi control for remote temperature adjustments
- ETL certified with overheat and dry-fire protection
- Self-modulating technology adjusts power to flow rate
Cons
- Requires two 40-amp double-pole breakers
- Needs 2 x 8/2 AWG wiring
- 12-pound weight requires sturdy wall mounting
Good fit if
- You have a 150-amp household electrical service
- You want remote temperature control via WiFi
- You need stable water temperature during showers
Skip if
- You cannot install two 40-amp breakers
- You lack space for 8/2 AWG wiring
- You prefer a unit under 12 pounds
Verdict: WINTEMP 18kW Electric Tankless Water Heater offers reliable hot water with smart controls. It fits homes with strong electrical capacity and WiFi needs.
EcoSmart 13 kW Electric Tankless Water Heater
Best for: Compact point-of-use heating applications
- Fuel Type
- Electric
- Wattage
- 13 kW
- Voltage
- 240 V
- Dimensions
- 10 x 13.5 x 6.5 inches
- Weight
- 6.5 pounds
View on Amazon: EcoSmart 13 kW Electric Tankless Water Heater Affiliate link
This EcoSmart ECO 11 is a 13 kW electric tankless water heater designed for 240 V circuits. It uses self-modulating technology to adjust output based on flow. The unit measures 10 by 13.5 by 6.5 inches and weighs 6.5 pounds. It is configured for climates with incoming water temperatures around 60 degrees. This model suits users needing point-of-use heating in compact spaces.
Pros
- 13 kW power output at 240 volts
- Patented self-modulating technology adjusts heat
- Compact dimensions of 10 x 13.5 x 6.5 inches
- Lightweight at 6.5 pounds for easy mounting
Cons
- Lower wattage compared to 18 kW whole-house competitors
- Specifically configured for moderate climates only
- No WiFi or smart home connectivity listed
Good fit if
- You need a compact unit for a single sink or shower
- You have a 240 V electrical circuit available
- You live in a region with moderate incoming water temperatures
Skip if
- You require whole-house hot water for multiple simultaneous uses
- You live in a cold climate with very low incoming water temperatures
- You want smart controls or remote monitoring capabilities
Verdict: EcoSmart ECO 11 13kW Electric Unit provides reliable point-of-use heating for moderate climates. It fits well in tight spaces where whole-house units would be too large or powerful.
Orbek 18kW 240V Tankless Electric Water Heater
Best for: high-demand whole-house hot water needs
- Fuel Type
- Electric
- Flow Rate
- 4.22 GPM
- Wattage
- 18 kW
- Voltage
- 240V
- Certification
- ETL
- Dimensions
- 17 x 13 x 3.9 inches
View on Amazon: Orbek 18kW 240V Tankless Electric Water Heater Affiliate link
This Oerbek unit delivers 18 kW of heating power at 240 volts for whole-house hot water. It features a compact wall-mounted design measuring 17 by 13 inches with a slim 3.9-inch depth. The system provides endless hot water up to 140°F and includes ETL certification for safety. It is designed to save energy by adjusting power based on water flow, making it suitable for homes needing continuous hot water.
Pros
- High 18 kW output for whole-house use
- Compact wall-mounted design saves space
- ETL certified for safety compliance
- Energy-saving flow adjustment technology
Cons
- Requires two 40-amp double-pole breakers
- Needs 8/2 AWG wiring with ground
- Maximum amperage draw of 75 amps
Good fit if
- You need high capacity for multiple fixtures
- You have the electrical capacity for 75 amps
- You want a compact wall-mounted unit
Skip if
- You cannot install two 40-amp breakers
- You lack space for 8/2 AWG wiring
- You prefer a lower amperage draw
Verdict: Oerbek 18kW Electric Tankless Water Heater offers strong heating power for homes with adequate electrical infrastructure. It fits buyers who need high flow rates and can support the required 75-amp circuit load.
SIVUATEK 18 kW Electric Tankless Water Heater
Best for: High flow needs with strong electrical capacity
- Fuel Type
- Electric
- Flow Rate
- 4.3 GPM
- Wattage
- 18 kW
- Voltage
- 240V
- Certification
- ETL
- Use
- Whole House
View on Amazon: SIVUATEK 18 kW Electric Tankless Water Heater Affiliate link
The SIVUATEK 18kW unit delivers up to 4.3 GPM of hot water at 240V. Its compact 3x11x15 inch design saves space for point-of-use installation. The self-modulating system adjusts power based on flow rate to maintain consistent temperature. It features separated water and electrical lines to reduce corrosion and scale. ETL certification ensures safety for residential or commercial use.
Pros
- 18 kW heating power provides up to 4.3 GPM flow rate
- Self-modulating technology adjusts power input for stable temperature
- Separate water and electrical lines minimize internal corrosion
- Compact 3-inch depth fits tight spaces for point-of-use
- ETL listed for safety compliance in residential or commercial settings
Cons
- Requires a dedicated 40A double-pole circuit breaker
- Uses 8AWG wiring which may need panel upgrades
- Black finish may not match all gray or white decor styles
Good fit if
- You need high flow for a whole house or large bathroom
- You have the electrical capacity for a 40A breaker
- You want a compact unit for point-of-use installation
Skip if
- Your panel cannot support a 40A double-pole breaker
- You prefer a white or gray finish for your walls
- You need a unit with smart home connectivity features
Verdict: SIVUATEK 18kW Electric Tankless Heater offers strong flow for homes with adequate electrical infrastructure. It suits users who prioritize high capacity and compact depth over smart features or specific color finishes.
Specifications side by side
| Spec | Eemax 8.0 kW Electric Tankless Water Heater | ThermoMate 14kW Electric Tankless Water Heater | Ranein 18kW 4.3 GPM Electric Water Heater | WINTEMP 18 kW Tankless Water Heater with WiFi | EcoSmart 13 kW Electric Tankless Water Heater | Orbek 18kW 240V Tankless Electric Water Heater | SIVUATEK 18 kW Electric Tankless Water Heater |
|---|---|---|---|---|---|---|---|
| Fuel Type | Electric | Electric | Electric | Electric | Electric | Electric | Electric |
| Flow Rate | not stated | 3.4 GPM | 4.3 GPM | Up to 4.3 GPM | not stated | 4.22 GPM | 4.3 GPM |
| Wattage | 8.0 kW | 14 kW | 18 kW | 18 kW | 13 kW | 18 kW | 18 kW |
| Installation Location | not stated | Indoor | not stated | not stated | not stated | not stated | not stated |
| Voltage | 240 V | 240 V | 240 V | 240V | 240 V | 240V | 240V |
| Temperature Control | not stated | 86°F to 131°F | 86°F to 131°F, 1°F increments | not stated | not stated | not stated | not stated |
| Certification | not stated | ETL | CSA | ETL | not stated | ETL | ETL |
| Dimensions | 4.5 x 14 x 18 inches | 15.9" x 11.2" x 3" | not stated | 19.2 x 11.1 x 4 inches | 10 x 13.5 x 6.5 inches | 17 x 13 x 3.9 inches | not stated |
| Use | not stated | not stated | Whole House | Whole House | not stated | Whole House | Whole House |
| Features | not stated | not stated | not stated | WiFi | not stated | not stated | not stated |
| Weight | 7.04 pounds | 13 pounds | 17.4 pounds | 12 pounds | 6.5 pounds | not stated | 19 pounds |
| Color | Gray | Gray | Gray | Gray | color | Snow | Black |
| Model | HA008240 | EH140 | RE18K | WN18 | ECO 11 | HEU-ET018A5W-M0 | V7B-180B |
| Size | not stated | not stated | not stated | 18kW | 12 x 8 x 4 | M-18 | M-18 |
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Frequently asked questions
Which alternative offers the highest flow rate for whole-house use?
The Ranein RE18K provides a flow rate of 4.3 GPM. This model delivers 18 kW of power to support strong hot water output. It is designed for households needing reliable whole-house performance. You must install dual 40 A circuits to run this unit effectively.
What is the most compact electric tankless water heater listed?
The EcoSmart ECO 11 is the most compact option. It measures 6.5 x 13.5 x 10 inches and weighs just 6.5 pounds. This small footprint makes it ideal for tight spaces. It provides 13 kW of power for point-of-use applications in moderate climates.
Which model includes WiFi connectivity for smart home integration?
The WINTEMP WN18 features built-in WiFi capabilities. It offers 18 kW of heating power for reliable hot water. This unit is best for homes with 150-amp electrical service. You can control and monitor the heater remotely using smart device apps.
How does the ThermoMate EH140 compare to the Eemax in power?
The ThermoMate EH140 offers 14 kW, which is significantly higher than the Eemax’s 8.0 kW. This increased wattage supports faster heating for single-fixture use. It fits well in small spaces and apartments. The unit operates on a standard 240V electrical connection.
Which heater requires the highest electrical circuit capacity?
The Orbek HEU-ET018A5W-M0 requires a 75-amp circuit load. It delivers 18 kW of power for high-demand whole-house needs. This model is suitable for homes with adequate electrical infrastructure. It provides strong heating performance for users prioritizing flow rate over smart features.
What is the weight of the Eemax HA008240?
The Eemax HA008240 weighs 7.04 pounds. It is a lightweight unit designed for easy installation. The compact dimensions of 4.5 x 14 x 18 inches allow it to fit in tight spaces. It provides 8.0 kW of electric heat for single point-of-use applications.
Which models are best suited for high-flow whole-house setups?
The Ranein, WINTEMP, Orbek, and SIVUATEK models are best for whole-house use. All four deliver 18 kW of power. The Ranein specifically highlights a 4.3 GPM flow rate. These units require robust electrical capacity, such as dual 40 A or higher amp circuits.
Does the SIVUATEK V7B-180B have a digital display?
The provided data does not mention a digital display for the SIVUATEK V7B-180B. It offers 18 kW of power for high flow needs. The unit measures 3 x 11 x 15 inches and weighs 19 pounds. It is designed for users prioritizing capacity over smart features.