Looking Beyond the Ecosmart US EcoSmart ECOS 18 Tankless? 6 Alternatives Worth a Look

How the other options compare

Rheem 18kW 240V Electric Tankless Water Heater

The Rheem RTEX-18 shares the same 18 kW power and 240V requirement as the EcoSmart ECOS 18, but it targets whole-house use rather than single-point applications. While the EcoSmart model measures 19 inches in height, the Rheem unit is slightly shorter at 18.5 inches but wider at 14.5 inches. This design accommodates durable copper heating elements, which may offer longer lifespan in hard water areas. You gain precise digital temperature control, similar to the EcoSmart’s one-degree accuracy, but the Rheem sacrifices some compactness. Choose this if you need reliable whole-house performance and prefer copper components over the EcoSmart’s point-of-use focus.

Westinghouse 18kW 240V WiFi Tankless Heater

The Westinghouse ET018CA0G also delivers 18 kW at 240V but adds WiFi connectivity for app-based control, a feature absent in the basic EcoSmart ECOS 18. Its dimensions are 14.2 inches square by 3.94 inches tall, making it significantly flatter than the EcoSmart’s 19-inch height. This low profile suits installations where vertical space is limited. The unit includes built-in scale protection, offering better longevity in areas with hard water compared to the standard EcoSmart model. While both provide precise temperature management, the Westinghouse is better for tech-savvy users who want remote monitoring and scale prevention in a compact, whole-house capable package.

Electrolux 18kW Electric Tankless Water Heater

The Electrolux 18kW model matches the EcoSmart’s 18 kW output and 240V input but adds WiFi features for smart home integration. It measures 14.1 inches square by 18.7 inches tall, which is slightly narrower but similar in height to the EcoSmart’s 19-inch frame. This unit is designed for whole-house use, offering more capacity than the EcoSmart’s point-of-use focus. The Pearl White finish differs from the EcoSmart’s standard white. You gain connectivity and scale protection, which the base EcoSmart model lacks. Select this option if you need smart controls and whole-house hot water delivery in a similarly sized footprint.

Electrolux 18kW Electric Tankless Water Heater

The second Electrolux 18kW unit, model EET018, shares the same 18 kW power and 240V voltage as the EcoSmart ECOS 18. It features a Pearl White finish and measures 14.1 inches square by 18.7 inches tall, offering a slightly narrower profile than the EcoSmart’s 19-inch height. This model emphasizes smart control and scale protection, features not listed for the standard EcoSmart. It is suited for multi-point homes requiring consistent hot water across several fixtures. While the EcoSmart focuses on compact point-of-use efficiency, this Electrolux variant provides better connectivity and durability for harder water conditions in a whole-house setup.

Electrolux 18kW Electric Tankless Heater

The Mount Steel MST-TLS18A offers adjustable power settings ranging from 12 to 18 kW at 240V, providing flexibility the fixed 18 kW EcoSmart ECOS 18 cannot match. Its dimensions are 12.2 inches square by 18.5 inches tall, making it narrower than the EcoSmart’s 19-inch width. This adjustability allows you to reduce power consumption in areas with electrical panel constraints. The Gray finish and compact square design suit tight installation spaces. While the EcoSmart delivers consistent high output, the Mount Steel is better for users needing variable power levels in a small footprint, particularly for point-of-use applications where electrical capacity is limited.

VEVOR 30-Gallon 5000W Electric Water Heater

The VEVOR 30-Gallon unit differs fundamentally by using a storage tank rather than tankless technology. It provides 5000W at 240V, significantly less power than the EcoSmart’s 18 kW, but offers continuous hot water via stored volume. Measuring 17.7 inches square by 40.2 inches tall, it is much larger and heavier at 74.5 pounds compared to the EcoSmart’s 9.3 pounds. This model suits small commercial or large family use where simultaneous multi-outlet flow is critical. Unlike the EcoSmart’s on-demand efficiency, the VEVOR prioritizes capacity and reliability for high-demand scenarios, making it ideal for buyers who need backup supply rather than space-saving instant heating.

Quick picks

Our 7 picks

1 Best overall

EcoSmart ECOS 18 Electric Tankless

Best for: single bathroom or point-of-use heating

Fuel Type

Electric

Flow Rate

1.8 to 4.3 GPM

Wattage

18 kW

Voltage

240 V

Temperature Control

within 1 degree

Dimensions

19 x 4.25 x 9.25 inches

View on Amazon: EcoSmart ECOS 18 Electric Tankless Affiliate link

The EcoSmart ECOS 18 is a compact 18 kW electric water heater designed for point-of-use applications. It delivers 1.8 to 4.3 GPM depending on inlet temperature and maintains water within 1 degree of the selected setting. Weighing just 9.3 pounds, it fits in tight spaces. This unit suits you if you need reliable hot water for a single bathroom or small sink without the bulk of a traditional tank.

Pros

• 18 kW power output for consistent heating
• Temperature control within 1 degree of selection
• Compact dimensions of 19 x 4.25 x 9.25 inches
• 96% thermal energy efficiency

Cons

• Flow rate maxes at 4.3 GPM
• Limited to single-point or low-flow use
• Only 1 year parts warranty

Good fit if

• You need hot water for one bathroom
• You have limited installation space
• You want point-of-use efficiency

Skip if

• You need whole-house hot water
• You require high flow rates over 4 GPM
• You need long-term parts coverage

Verdict: EcoSmart ECOS 18 Electric Tankless is a compact, efficient choice for single-bathroom setups. It delivers precise temperature control in a small footprint, making it ideal for low-flow applications where space and energy savings matter most.

2 Also great

Rheem 18kW 240V Electric Tankless Water Heater

Best for: Whole-house hot water with precise temp control

Fuel Type

Electric

Flow Rate

4.4 GPM

Wattage

18 kW

Voltage

240 V

Temperature Control

±1°F

Dimensions

3.5 x 14.5 x 18.5 inches

View on Amazon: Rheem 18kW 240V Electric Tankless Water Heater Affiliate link

The Rheem RTEX-18 is an 18 kW, 240 V electric tankless water heater. It delivers up to 4.4 GPM with copper immersion heating elements. The unit features an external digital thermostat with LED display and ±1°F accuracy. Its compact 3.5 x 14.5 x 18.5 inch design allows for easy installation. This model suits whole-house needs where precise temperature control and durable internal components are priorities.

Pros

• 18 kW power output at 240 V
• High flow rate of 4.4 GPM
• External digital thermostat with LED display
• Precise ±1°F temperature accuracy
• Durable copper immersion heating elements

Cons

• No built-in Wi-Fi connectivity for remote control
• Lacks an adjustable power setting feature
• Requires 240 V electrical supply

Good fit if

• You need a whole-house unit with a 4.4 GPM flow rate
• You want precise temperature control with a digital display
• You prefer durable copper heating elements

Skip if

• You require Wi-Fi connectivity for app control
• You only have a 120 V electrical circuit
• You need an adjustable wattage setting

Verdict: Rheem RTEX-18 Electric Tankless provides reliable whole-house hot water with precise digital temperature control. It is a strong choice for buyers who prioritize durable copper elements and exact temperature accuracy over smart connectivity.

3 Also great

Westinghouse 18kW 240V WiFi Tankless Heater

Best for: Smart control and scale protection

Fuel Type

Electric

Flow Rate

4.2 GPM

Wattage

18 kW

Voltage

240V

Temperature Control

86–140°F, 1°F increments

Certification

ETL

View on Amazon: Westinghouse 18kW 240V WiFi Tankless Heater Affiliate link

This 18 kW unit delivers up to 4.2 GPM at 240 volts. It features Wi-Fi app control and an LED display for precise temperature adjustments in 1°F increments. The compact design fits tight spaces. It includes a scale inhibitor and ETL safety certifications. You get endless hot water with remote access capabilities.

Pros

• 18 kW power for up to 4.2 GPM flow
• Wi-Fi app and voice assistant compatibility
• LED display with 1°F temperature precision
• Includes free scale inhibitor for maintenance

Cons

• Requires 75-amp electrical panel capacity
• Heavy at 15.4 pounds for wall mounting
• Limited to electric fuel type only

Good fit if

• You need smart remote temperature control
• You have a dedicated 240V/75A circuit
• You want scale protection included

Skip if

• You lack 75-amp electrical service
• You prefer gas-powered heating systems
• You cannot support heavy wall mounts

Verdict: Westinghouse 18kW Electric Tankless Heater suits homeowners with strong electrical panels who want app-based control. It offers precise temperature management and built-in scale protection for whole-house use.

4 Best premium

Electrolux 18kW Electric Tankless Water Heater

Best for: smart home integration and whole-house use

Fuel Type

Electric

Flow Rate

4.2 GPM

Wattage

18 kW

Voltage

240V

Temperature Control

80°F – 140°F, 1℉

Dimensions

18.7 x 14.1 x 14.1 inches

View on Amazon: Electrolux 18kW Electric Tankless Water Heater Affiliate link

The Electrolux 18kW unit delivers up to 4.2 GPM of hot water for whole-house use. It operates on 240V power and includes smart Wi-Fi control via an app and Alexa. The device adjusts temperatures between 80°F and 140°F. Its compact design measures 18.7 by 14.1 by 14.1 inches. You get endless hot water for multiple points of use simultaneously.

Pros

• 18 kW heating power for high flow rates
• Wi-Fi connectivity for remote app control
• Alexa voice control compatibility
• Adjustable temperature range from 80°F to 140°F

Cons

• Requires two 40A breakers and 8 AWG wires
• Only includes a 1-year warranty
• No physical display or remote control mentioned

Good fit if

• You want smart home integration for temperature adjustments
• You need high flow rates for multiple bathrooms
• You have the required electrical capacity installed

Skip if

• You cannot install dual 40A breakers
• You prefer a longer warranty period
• You want a unit with a built-in display

Verdict: Electrolux 18kW Electric Tankless Water Heater suits tech-savvy users who need reliable whole-house hot water with smart features. It is ideal for homes with adequate electrical infrastructure.

5 Also great

Electrolux 18kW Electric Tankless Heater

Best for: multi-point homes needing smart control

Fuel Type

Electric

Flow Rate

Up to 4.2 GPM

Wattage

18kW

Voltage

240V

Temperature Control

86°F to 140°F

Certification

ETL Listed to UL 499

View on Amazon: Electrolux 18kW Electric Tankless Heater Affiliate link

This Electrolux unit delivers up to 4.2 GPM at 18kW and 240V. It includes a scale inhibitor to protect the copper core. You get smart Wi-Fi control and Alexa compatibility. The device heats water from 86°F to 140°F. It suits homes needing steady hot water at two points. The lead-free core ensures cleaner output. You save energy with self-modulating power.

Pros

• Includes replaceable scale inhibitor pre-filter
• Delivers up to 4.2 GPM flow rate
• Features Wi-Fi and Alexa voice control
• Uses lead-free copper heating core

Cons

• Requires 240V electrical connection
• No remote control included
• App control requires smartphone setup

Good fit if

• You need hot water for two fixtures
• You want smart home integration
• You have hard water conditions

Skip if

• You only have 120V outlets
• You need more than 4.2 GPM
• You prefer gas-powered units

Verdict: Electrolux 18kW Electric Tankless Heater offers solid multi-point performance with smart features. It fits households valuing connectivity and scale protection over basic operation.

6 Best budget

Mount Steel 18kW Adjustable Electric

Best for: Flexible power in tight spaces

Fuel Type

Electric

Wattage

12-18kW Adjustable

Installation Location

Point-of-use

Voltage

240V

Certification

ETL

Dimensions

18.5 x 12.2 x 12.2 inches

View on Amazon: Mount Steel 18kW Adjustable Electric Affiliate link

The Mount Steel MST-TLS18A is a 240V electric unit with adjustable wattage from 12kW to 18kW. It uses dry-heating tech to reduce mineral buildup and corrosion. The compact 18.5-inch design fits tight spaces. ETL certification ensures safety. You get precise temperature control via accurate sensors. This unit suits homes needing flexible power configurations based on your electrical panel capacity.

Pros

• Adjustable 12kW to 18kW power output
• Dry-heating technology reduces scale buildup
• Compact 18.5 x 12.2 x 12.2 inch size
• ETL certified for safety

Cons

• Limited to point-of-use installation
• No Wi-Fi connectivity for remote control
• Lacks digital temperature display

Good fit if

• You need flexible wattage for your electrical panel
• You have limited space for installation
• You want low maintenance via dry-heating tech

Skip if

• You require whole-house capacity
• You need smart home integration
• You prefer digital temperature readouts

Verdict: Mount Steel 18kW Adjustable Electric fits users who need flexible power settings in a small footprint. It is a solid choice for point-of-use applications where space and electrical constraints matter.

7 Best commercial

VEVOR 30-Gallon 5000W Electric Water Heater

Best for: small commercial or family multi-outlet use

Fuel Type

Electric

Wattage

5000 W

Capacity

30 gal

Voltage

240 V

Dimensions

40.2 x 17.7 x 17.7 inches

Use

Commercial

View on Amazon: VEVOR 30-Gallon 5000W Electric Water Heater Affiliate link

This VEVOR unit is a 30-gallon electric tank water heater designed for families of three to five people or small commercial use. It operates at 240 volts with 5000 watts of power. The 40.2-inch tall unit features an enamel interior and LED display. It fits three to four outlets, making it suitable for simultaneous use in bathrooms and kitchens.

Pros

• 30-gallon capacity supports 3-4 water outlets
• 20 mm foam insulation reduces heat loss
• LED display shows heating status
• IPX4 waterproof rating for safety
• Enamel interior resists corrosion

Cons

• Significantly larger and heavier than the 18kW tankless alternatives on this list
• Requires 240V electrical connection
• Uses rotary knob instead of digital temperature control

Good fit if

• You need hot water for multiple outlets simultaneously
• You have space for a 30-gallon tank
• You require a commercial-grade unit

Skip if

• You want a compact tankless design
• You only have 120V outlets available
• You need instant hot water without storage

Verdict: VEVOR 30 Gallon Electric Tank Heater provides reliable storage capacity for small commercial or large family use. It suits buyers who prioritize simultaneous multi-outlet flow over space-saving tankless technology.

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