Eemax SPEX75 Water Heater Alternatives: 6 Similar Picks Compared
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You are looking for eemax spex75 water heater alternatives because your needs may differ from the original model. The Eemax SPEX75 is a 7.5 kW unit designed for single sink or shower point-of-use. It measures just 3.4 by 5.9 by 12.3 inches and weighs 3 pounds. This compact size fits tight spaces, but it lacks the power for whole-house demands. You might need more flow rate, a different wattage, or smart features like WiFi control. Some users also prefer brands with different certifications or larger capacities for higher amperage homes.
We selected these 6 alternatives because their published specifications overlap with the original unit. Each option shares the 240V electrical requirement but varies in wattage and physical dimensions. You will find options ranging from 13 kW to 18 kW for greater heating power. Some models offer WiFi connectivity for remote management, while others focus on compact footprints or high flow rates. This list helps you compare voltage, wattage, and size to find the right fit. Review the specs for each model to ensure your electrical infrastructure supports the chosen unit. Choose based on whether you need point-of-use efficiency or whole-house capacity.
Our top pick: Eemax FlowCo 7.5 kW Electric Tankless Water Heater.
How these options differ from the Eemax
ThermoMate 14kW Electric Tankless Water Heater
The ThermoMate 14kW model doubles your heating power compared to the 7.5kW Eemax. This higher wattage allows for faster recovery and potentially better performance at slightly higher flow rates. It is larger, measuring 15.9 inches tall versus the Eemax’s 3.4 inches, and weighs 13 pounds instead of 3 pounds. You need a 240V circuit, just like with the Eemax. This unit suits small homes with limited electrical capacity that need more hot water than a single sink provides. It is a budget-friendly step up if you need more than point-of-use capacity but cannot support a full whole-house system.
Ranein 18kW 4.3 GPM Electric Water Heater
The Ranein 18kW unit offers 18 kW of power, more than double the Eemax’s 7.5 kW. It delivers a flow rate of 4.3 GPM, making it suitable for whole-house use rather than just a single sink. The physical size is significantly larger at 18.7 inches tall and 17.4 pounds, requiring more space and electrical infrastructure. You gain robust hot water for multiple fixtures but lose the compact footprint of the Eemax. This pick is for users who prioritize flow rate and efficiency over smart features and have the necessary electrical capacity for a high-draw appliance.
WINTEMP 18 kW Tankless Water Heater with WiFi
The WINTEMP 18kW model matches the Ranein in power but adds WiFi connectivity for remote control. It shares the 18 kW wattage and 240V requirement, offering high flow rates suitable for homes needing digital management capabilities. It measures 19.1 inches tall and weighs 12 pounds, which is bulkier than the Eemax but lighter than some competitors. You get precise temperature control and the ability to monitor the unit remotely. This option is best for users who need high output and want to manage their hot water system from a distance, provided they have adequate electrical infrastructure.
EcoSmart 13 kW Electric Tankless Water Heater
The EcoSmart 13kW heater offers nearly double the power of the Eemax while remaining compact. It measures 10 inches tall and weighs 6.5 pounds, making it slightly larger and heavier than the Eemax but still suitable for tight spaces. It operates on 240V and is designed for single-sink or shower applications in mild climates. You gain more heating capacity without the bulk of a whole-house unit. This model fits buyers who need basic instant hot water without the constraints of the Eemax’s lower wattage, offering a balance between power and size for point-of-use installations.
Orbek 18kW 240V Tankless Electric Water Heater
The Orbek 18kW unit provides whole-house hot water with 18 kW of power, significantly more than the Eemax’s 7.5 kW. It measures 11 inches tall and 8 inches wide, offering a different form factor than the tall, narrow Eemax. It requires a 240V circuit and sufficient electrical infrastructure to handle the high amperage. You gain reliable, high-output hot water for multiple fixtures but lose the ultra-compact size of the Eemax. This pick suits buyers who prioritize high output and safety certification over compact wiring requirements, making it ideal for whole-house electric hot water needs.
Rheem 13kW Compact Electric Tankless Water Heater
The Rheem 13kW heater offers nearly double the power of the Eemax in a similarly compact form. It measures 3.63 inches tall and weighs 3.97 pounds, making it slightly taller and heavier than the Eemax. It operates on 240V and is designed for small households or point-of-use setups where space and precision matter. You gain more heating capacity and precise temperature control without the bulk of larger models. This unit fits users who need reliable heating for a single sink or shower but want more power than the Eemax can provide, ensuring consistent performance in compact spaces.
Quick picks
Our 7 picks
Eemax FlowCo 7.5 kW Electric Tankless Water Heater
Best for: single sink or shower point-of-use
- Wattage
- 7.5kw
- Voltage
- 240V
- Dimensions
- 3.4" x 5.9" x 12.3"
- Weight
- 3 pounds
View on Amazon: Eemax FlowCo 7.5 kW Electric Tankless Water Heater Affiliate link
The Eemax SPEX75 is a 7.5kW electric tankless water heater designed for 240V circuits. It measures 3.4 by 5.9 by 12.3 inches and weighs just 3 pounds. This small footprint makes it ideal for tight spaces under sinks or in cabinets. It provides instant hot water for single fixtures rather than whole-house use. You get reliable performance in a compact gray unit.
Pros
- 7.5kW heating element for instant hot water
- Compact dimensions of 3.4 x 5.9 x 12.3 inches
- Lightweight at 3 pounds for easy mounting
- Standard 240V electrical connection
Cons
- 7.5kW power is lower than the 14kW to 18kW units on this list
- Small size limits flow rate to a single faucet
- No WiFi or smart controls listed in specifications
Good fit if
- You need a heater for a single sink or shower
- You have limited space under a cabinet or in a closet
- You want a lightweight unit that is easy to install
Skip if
- You need to heat water for multiple fixtures at once
- You require whole-house hot water capacity
- You want smart home integration or remote monitoring
Verdict: Eemax SPEX75 7.5kW Compact Heater fits users who need hot water for one specific sink or shower in a tight space. It is not suitable for whole-house demands or multi-fixture use.
ThermoMate 14kW Electric Tankless Water Heater
Best for: small homes with limited electrical capacity
- 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 14kW unit delivers up to 3.4 GPM of hot water at 240V. It features a cast aluminum heating element and self-modulating technology for stable temperatures between 86°F and 131°F. This compact, wall-mounted device weighs 13.2 lbs and measures 15.9 by 11.2 by 3 inches. It suits small homes or apartments where space is limited and you need reliable hot water for one or two fixtures.
Pros
- Provides up to 3.4 GPM flow rate
- Compact dimensions of 15.9 x 11.2 x 3 inches
- Heavy-duty cast aluminum heating element
- ETL listed for safety compliance
- Self-modulating chip for temperature stability
Cons
- Lower 14kW wattage than competing 18kW models
- Requires a dedicated 60 Amp circuit breaker
- Indoor installation only
Good fit if
- You need a compact unit for small spaces
- You have the electrical capacity for a 60 Amp breaker
- You want ETL certified safety standards
Skip if
- You need higher flow rates for whole-house use
- You cannot install a 60 Amp double-pole circuit
- You require outdoor installation capability
Verdict: ThermoMate 14kW Electric Tankless Heater is a space-saving option for small households that can support its electrical requirements.
Ranein 18kW 4.3 GPM Electric Water Heater
Best for: Whole-house hot water with high flow rate
- 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 tankless water heater delivers 4.3 GPM at 240V, supporting two to three outlets simultaneously. It features 99% thermal efficiency and precise temperature control from 86°F to 131°F in 1°F increments. This CSA-certified unit includes an LED display and stainless steel heating elements. It suits whole-house applications where consistent flow and energy savings are priorities.
Pros
- 18kW power output supports multiple simultaneous water outlets
- High 99% thermal efficiency reduces standby heat loss
- Precise temperature adjustment in 1°F increments
- CSA certified for safety in the US and Canada
Cons
- Requires two dedicated 40A double-pole breakers and 8 AWG cables
- Bulky dimensions at 18.7 inches high and 13.8 inches wide
- Manual control knob lacks digital precision of app-based systems
Good fit if
- You need a high-flow unit for whole-house use
- You have the electrical capacity for dual 40A circuits
- You prefer manual controls with an LED display
Skip if
- You only have a single 40A circuit available
- You require WiFi connectivity for remote monitoring
- You have limited wall space for a 18.7-inch unit
Verdict: Ranein 18kW Electric Tankless Water Heater fits homes needing robust whole-house hot water with precise manual control. It is ideal for users with the necessary electrical infrastructure who prioritize flow rate and efficiency over smart features.
WINTEMP 18 kW Tankless Water Heater with WiFi
Best for: homes needing high flow and remote control
- 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 18kW electric tankless water heater designed for 240V circuits. It delivers up to 4.3 GPM of continuous hot water, making it suitable for whole-house use in mild climates. The unit features self-modulating technology to adjust power based on flow rate. It includes remote WiFi control for temperature adjustments without physical access. The compact design measures 11.1 by 19.2 by 4 inches and weighs 12 pounds.
Pros
- 18kW heating capacity for high flow rates
- Remote WiFi control for temperature adjustment
- Self-modulating technology for energy efficiency
- ETL certified for safety compliance
Cons
- Requires two 40-amp double-pole breakers
- Needs 8/2 AWG wiring for installation
- Limited to 2-year manufacturer warranty
Good fit if
- You have a 150-amp household electrical service
- You want remote temperature control via WiFi
- You need high flow for multiple bathrooms
Skip if
- You only have a standard 100-amp electrical panel
- You cannot install two 40-amp breakers
- You prefer a longer warranty period
Verdict: WINTEMP 18kW WiFi Electric Heater offers robust heating power and remote control for homes with adequate electrical capacity. It fits users who need high flow rates and digital management capabilities.
EcoSmart 13 kW Electric Tankless Water Heater
Best for: Single sink or shower in mild climates
- 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
The EcoSmart ECO 11 is a 13 kW electric tankless water heater designed for 240 V circuits. It features patented self-modulating technology to adjust power based on flow. The unit measures 10 x 13.5 x 6.5 inches and weighs 6.5 pounds. It is configured for climates with incoming water temperatures around 60 degrees Fahrenheit. This compact size makes it suitable for point-of-use installations.
Pros
- 13 kW heating capacity for instant hot water
- Compact dimensions of 10 x 13.5 x 6.5 inches
- Lightweight at 6.5 pounds for easy mounting
- Self-modulating technology adjusts power to flow rate
Cons
- Lower wattage than the 18 kW and 24 kW competitors on this list
- Designed for warmer climates with 60-degree incoming water
- No WiFi or smart home connectivity mentioned in specifications
Good fit if
- You need a compact unit for a single sink or shower
- You live in a mild climate with warm incoming water
- You want a lightweight electric heater for easy installation
Skip if
- You need whole-house hot water for multiple simultaneous uses
- You live in a cold climate with low incoming water temperatures
- You require smart controls or WiFi connectivity
Verdict: EcoSmart ECO 11 13kW Electric Heater is a compact, lightweight option for single-point applications in mild climates. It fits buyers who need basic instant hot water without the bulk of larger whole-house units.
Orbek 18kW 240V Tankless Electric Water Heater
Best for: Whole-house electric hot water with high amperage
- 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 18kW electric unit delivers instant hot water for whole-house use. It operates on 240V power and features wall-mounted installation to save space. The system includes energy-saving modulation and multiple safety protections like overheat and dry-fire guards. It is ETL certified and designed for 2-3 points of use. You get continuous hot water without the wait of traditional tanks.
Pros
- 18kW heating power for whole-house coverage
- Compact wall-mounted design saves space
- ETL certified for safety compliance
- Energy-saving modulation reduces power usage
Cons
- Requires 75A total amperage and 2x40A breakers
- Uses 8/2 AWG wiring which is bulky
- Dimensions listed as 17x13x3.9 in in one section but 11x8x8 in another
Good fit if
- You need a whole-house electric solution
- You have the electrical capacity for 75A
- You want a wall-mounted unit for tight spaces
Skip if
- You only have 240V circuits with lower amperage
- You cannot install 8/2 AWG wiring
- You need a unit smaller than 13 inches wide
Verdict: Orbek M-18 18kW Electric Tankless Water Heater provides reliable whole-house hot water for homes with sufficient electrical infrastructure. It suits buyers who prioritize high output and safety certification over compact wiring requirements.
Rheem 13kW Compact Electric Tankless Water Heater
Best for: Compact spaces and precise temperature control
- Voltage
- 240V
- Dimensions
- 12.6 × 8.25 × 3.63 inches
- Weight
- 3.97 pounds
View on Amazon: Rheem 13kW Compact Electric Tankless Water Heater Affiliate link
The Rheem RTEX-13 is a 13kW, 240V electric tankless water heater designed for residential use. It delivers up to 3.17 GPM at 54A. The unit features a compact build measuring 12.6 by 8.25 by 3.63 inches. It includes an external digital display with 1-degree accuracy. This model suits small households or point-of-use applications where space and precise temperature control matter.
Pros
- 13kW power output for instant heating
- Compact dimensions of 12.6 inches in length
- External digital thermostat with 1-degree adjustment
- 99.8% energy efficiency rating
- Includes 1/2 NPT adapters for installation
Cons
- Lower flow rate of 3.17 GPM compared to 18kW competitors
- Requires 54A electrical circuit
- Weighs 3.97 pounds, limiting portability
Good fit if
- You need a compact unit for tight spaces
- You want precise temperature control via digital display
- You have a 240V, 54A circuit available
Skip if
- You require higher flow rates for whole-house use
- You lack a dedicated 54A electrical circuit
- You prefer units with WiFi connectivity
Verdict: Rheem RTEX-13 13kW Compact Heater fits small households or point-of-use setups where space and precision matter. It delivers reliable heating without the bulk of larger models.
Specifications side by side
| Spec | Eemax FlowCo 7.5 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 | Rheem 13kW Compact Electric Tankless Water Heater |
|---|---|---|---|---|---|---|---|
| Fuel Type | not specified | Electric | Electric | Electric | Electric | Electric | not specified |
| Flow Rate | not specified | 3.4 GPM | 4.3 GPM | Up to 4.3 GPM | not specified | 4.22 GPM | not specified |
| Wattage | 7.5kw | 14 kW | 18 kW | 18 kW | 13 kW | 18 kW | not specified |
| Installation Location | not specified | Indoor | not specified | not specified | not specified | not specified | not specified |
| Voltage | 240V | 240 V | 240 V | 240V | 240 V | 240V | not specified |
| Temperature Control | not specified | 86°F to 131°F | 86°F to 131°F, 1°F increments | not specified | not specified | not specified | not specified |
| Certification | not specified | ETL | CSA | ETL | not specified | ETL | not specified |
| Dimensions | 3.4" x 5.9" x 12.3" | 15.9" x 11.2" x 3" | not specified | 19.2 x 11.1 x 4 inches | 10 x 13.5 x 6.5 inches | 17 x 13 x 3.9 inches | not specified |
| Use | not specified | not specified | Whole House | Whole House | not specified | Whole House | not specified |
| Features | not specified | not specified | not specified | WiFi | not specified | not specified | not specified |
| Weight | 3 pounds | 13 pounds | 17.4 pounds | 12 pounds | 6.5 pounds | not specified | 3.97 pounds |
| Color | Gray | Gray | Gray | Gray | color | Snow | Gray |
| Model | B2282392 | EH140 | RE18K | WN18 | ECO 11 | HEU-ET018A5W-M0 | RTEX-13 |
| Size | not specified | not specified | not specified | 18kW | 12 x 8 x 4 | M-18 | Compact |
Frequently asked questions
Can the Eemax FlowCo 7.5 kW replace my SPEX75 for a whole house?
No. This unit is designed for single sink or shower point-of-use applications. It lacks the heating power required for whole-house demands or multi-fixture use. You should only choose this model if you need hot water for one specific fixture in a tight space, similar to the original SPEX75.
Which alternative offers the highest flow rate for a full home?
The Ranein 18kW model provides a 4.3 GPM flow rate. This makes it ideal for whole-house hot water needs with high flow requirements. It offers precise manual control and robust heating power. This unit suits users with the necessary electrical infrastructure who prioritize flow rate over smart features.
Is there a tankless heater with WiFi connectivity in this list?
Yes. The WINTEMP 18kW model includes WiFi capabilities for remote control. It offers robust heating power and digital management features for your home. This option fits users who need high flow rates and the ability to manage their water heater settings remotely from a connected device.
What is the smallest tankless water heater available here?
The Eemax FlowCo 7.5 kW is the most compact option. It measures just 3.4 by 5.9 by 12.3 inches and weighs only 3 pounds. This tiny footprint makes it perfect for tight spaces where space-saving is the primary concern for your point-of-use installation.
Can the ThermoMate 14kW handle my small home needs?
Yes. This model is a space-saving option for small households. It doubles the heating power of the 7.5kW Eemax, allowing for faster recovery. It is designed for users who can support its electrical requirements and need a budget-friendly electric tankless solution for limited capacity homes.
Does the Orbek 18kW unit have a weight listed?
The provided data does not list the weight for the Orbek M-18 18kW unit. It provides dimensions of 8 by 11 by 8 inches and a snow color finish. This model provides reliable whole-house hot water for homes with sufficient electrical infrastructure and high output needs.
Is the Rheem 13kW heater suitable for compact spaces?
Yes. The Rheem RTEX-13 is a compact heater designed for small households or point-of-use setups. It measures 3.63 inches in height and weighs under 4 pounds. It delivers reliable heating and precise temperature control without the bulk of larger whole-house models.