Looking Beyond the Eemax SPEX65 FlowCo Tankless Electric? 6 Alternatives Worth a Look
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The Eemax SPEX65 FlowCo tankless electric water heater is designed for tight under-sink spaces. Its compact dimensions of 9.75 x 5 x 3 inches allow it to fit where standard units will not. If you are looking for eemax spex65 flowco tankless electric alternatives, you might want a different capacity or flow rate. This unit provides point-of-use heating based on flow rate, which limits its output for multiple fixtures. You may need a model with a higher wattage or a larger storage tank for whole-house applications.
The alternatives listed here were chosen because their specifications overlap with the original product. All options remain electric and fit specific use cases, from single sinks to whole homes. Some models offer WiFi control, while others provide higher kilowatt outputs for greater flow. You can compare these specs to find the right balance of size, power, and features for your home. This guide helps you evaluate each unit based on published data rather than subjective opinions.
Our top pick: Eemax FlowCo Compact Electric Tankless Water Heater.
How these alternatives differ
Thermomate 8-Gallon 120V Point-of-Use Water Heater
The Thermomate ES800 is an 8-gallon storage unit, unlike the Eemax’s tankless design. It measures 17.7 x 17.7 x 17.7 inches and weighs 27 pounds. This model runs on 120V power. It suits single-sink applications where space allows for a small tank. You gain stored hot water for short bursts. You lose the endless flow of tankless models. This unit is ideal for RVs or bathrooms with limited electrical capacity. It provides consistent temperature for brief use. It does not fit tight under-sink cabinets like the Eemax. Choose this if you need reliable point-of-use heating without high amperage demands.
ThermoMate 14kW Electric Tankless Water Heater
The Thermomate EH140 offers 14 kW of power for whole-house or multi-fixture use. It is larger than the Eemax, measuring 15.9 x 11.2 x 11.2 inches. It requires 240V electricity. This unit provides continuous hot water for small homes with 60 Amp service. You get higher output than the Eemax’s point-of-use design. You sacrifice the ultra-compact 3-inch depth. This heater fits indoor installations where wall space permits. It prioritizes safety certifications and compact form over volume. Pick this if you need more flow for a kitchen or bathroom. It is not suitable for tight under-sink spaces due to its width.
Thermomate 8-Gallon Point-of-Use Water Heater
The Thermomate ES900 is an 8-gallon tank water heater. It measures 21 x 14 x 14 inches and weighs 34 pounds. It includes a thermostat for temperature control. This unit is designed for single-sink point-of-use heating. You gain stored hot water capacity. You lose the on-demand efficiency of the Eemax. It is larger and heavier than the 3-pound Eemax. This model fits areas with standard electrical access. It is not for tight cabinets. Choose this if you need a low-voltage solution for a small appliance. It provides reliable heat for brief tasks. It requires more space than the compact Eemax FlowCo.
Ranein 18kW 4.3 GPM Electric Water Heater
The Ranein RE18K is a whole-house unit with 18 kW power. It delivers 4.3 GPM flow rate. It measures 18.7 x 13.8 x 13.8 inches. It requires 240V electricity. This model provides precise temperature control for busy households. You get high-volume continuous hot water. You sacrifice the tiny footprint of the Eemax. This heater needs significant electrical infrastructure. It is not for under-sink installation. Pick this if you need hot water for multiple fixtures. It offers stable flow for showers and sinks. The Eemax is better for single-point use. Choose Ranein for whole-home coverage.
WINTEMP 18 kW Tankless Water Heater with WiFi
The WINTEMP WN18 features WiFi connectivity for remote control. It has 18 kW power and measures 19.1 x 11.1 x 4 inches. It runs on 240V. This unit offers stable flow in mild climates. You gain digital control and monitoring. You lose the simplicity of the Eemax’s analog controls. It is slightly wider than the Eemax. This model fits users who value tech integration. It requires specific electrical setup. Choose this if you want remote temperature adjustments. It is not ideal for tight spaces. The Eemax is better for basic under-sink needs. WINTEMP suits those wanting smart features in a compact tankless design.
EcoSmart 13 kW Electric Tankless Water Heater
The EcoSmart ECO 11 has 13 kW power. It measures 10 x 13.5 x 6.5 inches and weighs 6.5 pounds. It requires 240V electricity. This unit is designed for compact point-of-use sink heating. You get reliable heating in tight installations. You sacrifice the Eemax’s 3-inch depth. It is slightly larger but still compact. This model fits where 240V power is accessible. It works well in moderate inlet water temperatures. Choose this if you need a small tankless heater. It is not as thin as the Eemax. EcoSmart offers a balance of size and power. It is suitable for small spaces with adequate electrical capacity.
Quick picks
Our 7 picks
Eemax FlowCo Compact Electric Tankless Water Heater
Best for: tight under-sink spaces
- Fuel Type
- Electric
- Temperature Control
- Temperature output based on flow rate
- Dimensions
- 9.75" x 5" x 3"
- Weight
- 3 pounds
View on Amazon: Eemax FlowCo Compact Electric Tankless Water Heater Affiliate link
The Eemax SPEX65 is a compact electric tankless water heater designed for point-of-use applications. It measures just 9.75 x 5 x 3 inches and weighs 3 pounds. This unit mounts in any orientation and activates only when water flows. It features SafeStart technology and self-diagnostics. Its temperature output adjusts based on flow rate. It suits tight spaces like under-sink installations where space is limited.
Pros
- Extremely compact dimensions of 9.75 x 5 x 3 inches
- Lightweight build at only 3 pounds
- Mounts in any orientation for flexible installation
- SafeStart technology for enhanced safety
- Self-diagnostics and intelligent controls
Cons
- Temperature control is fixed to flow rate, lacking precise manual adjustment
- Very small physical size limits whole-house application
- No digital display or remote control mentioned in specifications
Good fit if
- You need a heater for a single sink or small area
- You have limited space under a counter or cabinet
- You want a unit that mounts in any orientation
Skip if
- You require precise temperature control settings
- You need a whole-house hot water solution
- You want a digital display for monitoring
Verdict: Eemax SPEX65 Compact Electric Heater is a specialized solution for tight spaces. It fits users who need point-of-use heating in areas like under-sink cabinets where standard units will not fit.
Thermomate 8-Gallon 120V Point-of-Use Water Heater
Best for: single sink or small appliance hot water needs
- Fuel Type
- Electric
- Wattage
- 1440 W
- Capacity
- 8.0 gallons
- Voltage
- 120 V
- Temperature Control
- 50°F to 149°F
- Certification
- UL Listed
View on Amazon: Thermomate 8-Gallon 120V Point-of-Use Water Heater Affiliate link
This Thermomate unit is a compact 8-gallon electric water heater designed for point-of-use installation. It operates on 120V with 1440W of power, allowing you to plug it into a standard outlet. The adjustable thermostat ranges from 50°F to 149°F, and the tank features a fused porcelain enamel lining for corrosion resistance. Its small footprint makes it suitable for under-sink mounting in kitchens, bathrooms, or RVs.
Pros
- 120V plug-in connection for easy installation
- 8.0-gallon capacity for moderate hot water needs
- Adjustable temperature control from 50°F to 149°F
- UL Listed safety certification with T&P valve
Cons
- Lower wattage limits recovery speed for high demand
- Tank capacity is insufficient for whole-house supply
- Requires 120V outlet rather than dedicated 240V circuit
Good fit if
- You need hot water for a single sink or small appliance
- You have access to a standard 120V electrical outlet
- You are installing the unit in a confined space like under a counter
Skip if
- You require hot water for multiple simultaneous fixtures
- You need a whole-house heating solution
- Your electrical system only supports 240V circuits
Verdict: Thermomate 8 Gallon Electric Point-of-Use Heater provides reliable hot water for single-fixture applications where space and standard electrical access are priorities. It is a practical solution for kitchens, bathrooms, or RVs that do not require high-volume continuous flow.
ThermoMate 14kW Electric Tankless Water Heater
Best for: small homes with 60 Amp 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
This ThermoMate unit delivers up to 3.4 GPM of hot water at 240V. It features a 14kW cast aluminum heating element and touch controls. The compact 15.9 x 11.2 x 3-inch design saves space. It suits small homes or apartments running one to two fixtures. The 99% thermal efficiency reduces standby energy loss. ETL listing ensures safety standards are met for indoor use.
Pros
- 14kW power output supports up to 3.4 GPM flow rate
- Compact wall-mounted design measures only 15.9 x 11.2 x 3 inches
- 99% thermal efficiency with smart modulation for temperature stability
- ETL listed for UL-499 and CAN/CSA-C22.2 safety standards
Cons
- Requires a dedicated 60 Amp double-pole circuit breaker
- Touch controls may be less durable than physical knobs
- Limited to indoor installation only
Good fit if
- You need a compact unit for a small home or apartment
- You have the electrical capacity for a 60 Amp circuit
- You want to run one to two fixtures simultaneously
Skip if
- You require outdoor installation capability
- You need to power more than two fixtures at once
- Your electrical panel lacks a 60 Amp breaker space
Verdict: ThermoMate 14kW Electric Tankless Water Heater offers efficient, space-saving hot water for small households with adequate electrical infrastructure. It fits buyers prioritizing compact size and safety certifications over high-volume flow.
Thermomate 8-Gallon Point-of-Use Water Heater
Best for: single sink point-of-use heating
- Fuel Type
- Electric
- Wattage
- 1500W
- Capacity
- 8 gallons
- Voltage
- 120 Volts (AC)
- Temperature Control
- 90°F to 150°F
- Certification
- UL Listed
View on Amazon: Thermomate 8-Gallon Point-of-Use Water Heater Affiliate link
This 8-gallon point-of-use water heater delivers instant hot water for small spaces. It uses 1500W at 120 Volts to heat water between 90°F and 150°F. The compact 20.75-inch height fits under sinks or in cabinets. The porcelain enamel tank resists corrosion. You get precise temperature control and UL Listed safety for reliable daily use.
Pros
- 8-gallon capacity for point-of-use hot water
- 1500W heating element for fast recovery
- Adjustable thermostat from 90°F to 150°F
- Corrosion-resistant porcelain enamel tank
- Compact 20.75-inch low profile design
Cons
- Limited to 120 Volt electrical connection
- 8-gallon capacity restricts whole-house use
- Requires hard-wired installation
Good fit if
- You need hot water for a single sink
- You have limited space under a cabinet
- You want a 120 Volt plug-in or hard-wire option
Skip if
- You need hot water for multiple fixtures
- You require a 240 Volt connection
- You need a high-flow whole-house unit
Verdict: ThermoMate 8 Gallon Electric Tank provides reliable point-of-use heating for small spaces. It fits users who need a compact, low-voltage solution for a single sink or small appliance.
Ranein 18kW 4.3 GPM Electric Water Heater
Best for: Whole-house hot water with precise temp control
- 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 delivers up to 4.3 GPM of continuous hot water for whole-house use. It operates on 240V power with a compact 13.8 by 18.7 inch footprint. You can adjust temperature from 86°F to 131°F in 1°F increments. This unit requires two dedicated 40A breakers. It suits homes needing steady flow for multiple outlets.
Pros
- High 4.3 GPM flow rate for whole-house use
- Precise temperature control in 1°F increments
- 99% thermal efficiency reduces standby loss
- CSA certified for safety standards
Cons
- Requires two dedicated 40A double-pole breakers
- Needs 2 x 8 AWG cables for installation
- Gray color may not match all decor
Good fit if
- You need hot water for 2-3 outlets simultaneously
- You have the electrical capacity for dual 40A circuits
- You want precise temperature adjustments in small increments
Skip if
- You only have a single 40A breaker available
- You cannot run 8 AWG wiring to the unit
- You need a smaller point-of-use heater
Verdict: Ranein 18kW Whole House Electric offers high flow and precise control for busy households. It fits homes with the necessary electrical infrastructure for continuous hot water.
WINTEMP 18 kW Tankless Water Heater with WiFi
Best for: WiFi remote temperature 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 18 kW electric unit rated for 4.3 GPM at 240 volts. It uses self-modulating technology to adjust power based on flow, maintaining stable temperatures. The compact design measures 11.1 by 19.2 by 4 inches and includes remote WiFi control. This model suits homes in mild climates needing continuous hot water for showers.
Pros
- 18 kW power output
- 4.3 GPM flow rate
- WiFi remote control
- ETL certified safety
Cons
- Requires 2 x 40 Amp breakers
- Gray color only
- 2-year limited warranty
Good fit if
- You need remote temperature adjustments via WiFi
- You have a 150 Amp household service
- You want ETL certified safety features
Skip if
- You cannot install dual 40 Amp breakers
- You live in a cold climate requiring higher flow
- You prefer a 5-year warranty period
Verdict: WINTEMP 18kW Electric Tankless Water Heater fits users who value WiFi control and stable flow in mild climates. It requires specific electrical infrastructure and offers a shorter warranty than some competitors.
EcoSmart 13 kW Electric Tankless Water Heater
Best for: compact point-of-use sink heating
- 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 point-of-use applications. It operates on 240 volts and features self-modulating technology to adjust energy use based on demand. Its compact dimensions of 10 x 13.5 x 6.5 inches allow for easy installation in tight spaces. This unit is configured for climates where incoming water temperatures are around 60 degrees Fahrenheit, making it suitable for specific regional needs.
Pros
- 13 kW power output for efficient heating
- Compact 10 x 13.5 x 6.5 inch footprint
- Self-modulating technology adjusts to demand
- Lightweight at 6.5 pounds
Cons
- Limited to 240V electrical systems
- Optimized for warmer climates with 60°F inlet water
- Small capacity limits whole-house use
Good fit if
- You need a compact unit for a single sink
- You have a 240V electrical circuit available
- You live in a region with mild winter water temperatures
Skip if
- You require a whole-house hot water solution
- You only have 120V outlets available
- You live in a cold climate with low inlet water temperatures
Verdict: EcoSmart ECO 11 13kW Electric Heater provides reliable point-of-use heating for small spaces. It fits well in tight installations where 240V power is accessible and inlet water temperatures remain moderate.
Specifications side by side
| Spec | Eemax FlowCo Compact Electric Tankless Water Heater | Thermomate 8-Gallon 120V Point-of-Use Water Heater | ThermoMate 14kW Electric Tankless Water Heater | Thermomate 8-Gallon Point-of-Use 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 |
|---|---|---|---|---|---|---|---|
| Fuel Type | Electric | Electric | Electric | Electric | Electric | Electric | Electric |
| Flow Rate | not specified | not specified | 3.4 GPM | not specified | 4.3 GPM | Up to 4.3 GPM | not specified |
| Wattage | not specified | 1440 W | 14 kW | 1500W | 18 kW | 18 kW | 13 kW |
| Installation Location | not specified | not specified | Indoor | not specified | not specified | not specified | not specified |
| Capacity | not specified | 8.0 gallons | not specified | 8 gallons | not specified | not specified | not specified |
| Voltage | not specified | 120 V | 240 V | 120 Volts (AC) | 240 V | 240V | 240 V |
| Temperature Control | Temperature output based on flow rate | 50°F to 149°F | 86°F to 131°F | 90°F to 150°F | 86°F to 131°F, 1°F increments | not specified | not specified |
| Certification | not specified | UL Listed | ETL | UL Listed | CSA | ETL | not specified |
| Dimensions | 9.75" x 5" x 3" | 17.7"H x 17.7"W x 15.4"D | 15.9" x 11.2" x 3" | 20.75 in height | not specified | 19.2 x 11.1 x 4 inches | 10 x 13.5 x 6.5 inches |
| Use | not specified | not specified | not specified | not specified | Whole House | Whole House | not specified |
| Features | not specified | not specified | not specified | Thermostat | not specified | WiFi | not specified |
| Weight | 3 pounds | 27 pounds | 13 pounds | 34 pounds | 17.4 pounds | 12 pounds | 6.5 pounds |
| Color | White | White | Gray | White | Gray | Gray | color |
| Model | SPEX65 | ES800 | EH140 | ES900 | RE18K | WN18 | ECO 11 |
| Size | not specified | not specified | not specified | not specified | not specified | 18kW | 12 x 8 x 4 |
Frequently asked questions
Is there a tankless alternative to the Eemax SPEX65?
Yes, the Thermomate EH140 offers a true tankless design. It delivers 14 kW of power on 240V electricity. The unit measures 11.2 x 15.9 x 11.2 inches and weighs 13 pounds. This model suits small homes with adequate electrical capacity. It provides continuous hot water without the need for a storage tank.
What is the best whole-house tankless electric option?
The Ranein RE18K is designed for whole-house use. It provides 4.3 GPM of flow at 18 kW on 240V power. The unit measures 13.8 x 18.7 x 13.8 inches and weighs 17.4 pounds. This model fits busy households needing precise temperature control and high-volume continuous hot water.
Can I control my tankless heater via WiFi?
The WINTEMP WN18 includes built-in WiFi connectivity. It offers 18 kW of power on 240V electricity. The unit measures 11.1 x 4 x 19.1 inches and weighs 12 pounds. This model allows remote temperature adjustments. It suits users who value digital control and stable flow in mild climates.
Which tankless heater is best for compact spaces?
The EcoSmart ECO 11 is a compact choice. It delivers 13 kW on 240V power. The unit measures 13.5 x 10 x 6.5 inches and weighs 6.5 pounds. This model fits well in tight installations. It provides reliable point-of-use heating where 240V power is accessible and inlet water temperatures remain moderate.
Are there electric options for single sink applications?
The Thermomate ES800 is a 120V electric option. It is an 8-gallon storage unit, not tankless. The unit measures 17.7 x 17.7 x 17.7 inches and weighs 27 pounds. This model suits single-sink applications where space allows for a small storage tank. It provides reliable hot water for low-volume needs.
What is the smallest tankless electric water heater listed?
The WINTEMP WN18 has a slim profile. It measures 11.1 x 4 x 19.1 inches. The unit weighs 12 pounds and delivers 18 kW on 240V power. This compact design fits well in tight spaces. It offers WiFi control and stable flow for users needing a small footprint.
Does the Thermomate EH140 require special electrical setup?
Yes, the Thermomate EH140 requires 240V power. It delivers 14 kW of heating capacity. The unit measures 11.2 x 15.9 x 11.2 inches and weighs 13 pounds. This model suits small homes with adequate electrical infrastructure. It prioritizes compact size and safety certifications for efficient point-of-use or small home heating.