Mount Steel Electric Tankless Water Heater Alternatives: 6 Similar Picks Compared

How alternatives compare to Mount Steel

Rheem 18kW 240V Electric Tankless Water Heater

The Rheem RTEX-18 matches the 18 kW output but uses a different physical footprint. It measures 14.5 inches wide by 18.5 inches long and only 3.5 inches high. This slim profile suits wall mounts where depth is limited. It features copper heating elements for durability. Unlike the Mount Steel model, it lacks adjustable wattage settings. You get fixed power at 18 kW. It targets whole-house use with precise temperature control. If you need a low-profile unit for tight spaces, this slim design offers a practical alternative to the bulkier Mount Steel box.

Westinghouse 18kW 240V WiFi Tankless Heater

The Westinghouse ETL018CA0G provides 18 kW of power with WiFi connectivity. It measures 14.2 inches square and 3.94 inches high. This compact form factor fits easily in closets. The WiFi feature allows remote control, which the Mount Steel model does not list. It requires a 75A electrical capacity for full operation. This high demand limits where you can install it. The Mount Steel unit offers adjustable power to match your panel. If you have a robust electrical system and want smart control, the Westinghouse model adds digital convenience. If you need flexible power settings, the Mount Steel remains the better choice.

EcoSmart ECOS 18 Electric Tankless

The EcoSmart ECOS 18 is designed for point-of-use applications. It measures 9.25 inches square and 19 inches high. This small footprint suits tight spaces like under a single sink. It weighs only 9.3 pounds. Unlike the Mount Steel model, which supports adjustable power up to 18 kW, this unit is fixed at 18 kW. It prioritizes compactness over versatility. If you need hot water for one specific faucet in a small area, this tiny unit fits where larger heaters cannot. It lacks the adjustable power feature of the Mount Steel Pioneer. For single sink use, its size is its main advantage.

Electrolux 18kW Electric Tankless Water Heater

The Electrolux 18kW model offers WiFi connectivity and digital control. It measures 14.1 inches square and 18.7 inches high. It weighs 15.4 pounds. This unit targets whole-house flow with smart home integration. The Mount Steel model focuses on dry-heating technology to reduce scale. It lacks listed WiFi features. The Electrolux unit provides precise digital temperature management. If you want remote monitoring and control via an app, this Electrolux model adds that capability. If you prefer mechanical simplicity and scale reduction through dry heating, the Mount Steel design serves you better. The choice depends on your desire for smart features versus maintenance-free operation.

Electrolux 18kW Electric Tankless Heater

The Electrolux EET018 provides 18 kW of power for whole-house use. It measures 14.1 inches square and 18.7 inches high. It includes a scale inhibitor to protect internal components. This feature helps in hard water areas. The Mount Steel model uses dry-heating technology to reduce mineral buildup. It does not list a separate scale inhibitor. The Electrolux unit offers smart controls for temperature management. If you live in an area with hard water and want dedicated scale protection, this model adds that layer of durability. If you prefer the dry-heating approach to minimize maintenance, the Mount Steel design is the more suitable option for your specific water conditions.

VEVOR 30-Gallon 5000W Electric Water Heater

The VEVOR FJI-POR-120S2 is a 30-gallon tank water heater. It measures 17.7 inches square and 40.2 inches high. It weighs 74.5 pounds. This is a storage unit, not a tankless heater. It provides steady hot water volume for small commercial or family use. The Mount Steel model heats water instantly without storage. It measures 18.5 inches high and 12.2 inches square. If you need a large reserve of hot water and have space for a bulky tank, the VEVOR unit offers that capacity. If you want on-demand heating and a compact footprint, the Mount Steel tankless design is the appropriate choice. These two products serve fundamentally different needs.

Quick picks

Our 7 picks

1 Best overall

Mount Steel 18kW Adjustable Electric

Best for: Flexible power and compact installation

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 18kW unit offers adjustable power from 12kW to 18kW on a 240V circuit. Its dry-heating technology separates elements from water to reduce mineral buildup. The compact 18.5 by 12.2 by 12.2-inch design fits tight spaces. ETL certification ensures safety. You get precise temperature control via accurate sensors. This electric heater suits homes needing flexible energy usage.

Pros

• Adjustable wattage from 12kW to 18kW adapts to panel capacity
• Dry-heating tech reduces mineral buildup and corrosion
• Compact dimensions fit in tight spaces
• ETL certified for safety

Cons

• Limited to point-of-use installation
• No Wi-Fi connectivity for remote control
• Higher peak power may require panel upgrades

Good fit if

• You need flexible power settings for your electrical panel
• You want to reduce mineral buildup without maintenance
• You have limited space for installation

Skip if

• You require remote app control
• You need whole-house heating for multiple bathrooms
• You prefer gas-powered heating

Verdict: Mount Steel 18kW Electric Tankless Water Heater delivers adjustable power and compact design for tight spaces. It fits users who want to manage energy use and avoid scale buildup.

2 Best budget

Rheem 18kW 240V Electric Tankless Water Heater

Best for: Whole-house hot water with precise temperature 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

This Rheem unit delivers 18 kW of power at 240 volts, supporting a flow rate of up to 4.4 GPM for whole-house use. It features an external digital thermostat with ±1°F accuracy and copper immersion heating elements. The compact design measures 14.5 x 18.5 x 3.5 inches and weighs 14.8 pounds. You get field-serviceable components and simple bottom connections for installation.

Pros

• 18 kW output supports up to 4.4 GPM flow
• Digital control with ±1°F temperature accuracy
• Durable copper immersion heating elements
• Compact 3.5-inch depth for easy mounting

Cons

• Higher 14.8-pound weight compared to lighter competitors
• No built-in Wi-Fi connectivity for remote monitoring
• Requires 240V electrical circuit for operation

Good fit if

• You need precise temperature control for whole-house use
• You prefer durable copper heating elements
• You want field-serviceable internal components

Skip if

• You require smart home integration or app control
• You only have a 120V electrical outlet available
• You prefer a lighter unit for wall mounting

Verdict: Rheem 18kW Electric Tankless Water Heater offers precise temperature control and durable copper elements for whole-house hot water. It suits buyers who prioritize accuracy and serviceability over smart features.

3 Also great

Westinghouse 18kW 240V WiFi Tankless Heater

Best for: Smart control and compact whole-house heating

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 Westinghouse unit delivers 18 kW of power at 240V for whole-house use. It heats water 50% faster with copper components. Flow ranges from 0.5 to 4.2 GPM depending on inlet temperature. You get precise control via an LED display and Wi-Fi app. The compact design fits tight spaces. It includes ETL certification and a scale inhibitor for safety and longevity.

Pros

• 18 kW power output at 240V
• Wi-Fi app and voice control
• Precise 1°F temperature increments
• Compact 18.7-inch footprint
• ETL certified with safety protections

Cons

• Requires 75A electrical panel capacity
• Flow rate drops to 2.6 GPM in cold climates
• Professional installation recommended

Good fit if

• You need smart app control for remote adjustments
• You have a 240V circuit with 75A capacity
• You want whole-house hot water in a compact unit

Skip if

• You cannot install a 75A electrical breaker
• You live in an area with very cold inlet water and need high flow
• You prefer a unit with lower power requirements

Verdict: Westinghouse 18kW Electric Tankless offers smart connectivity and fast heating for homes with adequate electrical capacity. It suits users who want remote control and space-saving design but can support the 75A electrical demand.

4 Also great

EcoSmart ECOS 18 Electric Tankless

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

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 delivers 18 kW of power at 240 volts. It heats water on demand with efficiency up to 96%. Flow rates range from 1.8 to 4.3 GPM. The unit measures 19 x 4.25 x 9.25 inches and weighs 9.3 pounds. It maintains temperature within 1 degree. This compact heater suits small sinks or single bathrooms where space is limited.

Pros

• 18 kW output at 240V
• 96% thermal energy efficiency
• Compact 19-inch height
• Precise temperature control within 1 degree

Cons

• Lower flow rate than 18 kW competitors
• Shorter one-year parts warranty
• No Wi-Fi connectivity

Good fit if

• You need a small unit for a single sink
• You want high energy efficiency
• You prefer precise temperature stability

Skip if

• You need whole-house hot water
• You require smart home integration
• You want a longer warranty period

Verdict: EcoSmart ECOS 18 Electric Tankless is a compact, efficient choice for point-of-use applications. It fits well in tight spaces where high flow is not the priority.

5 Best premium

Electrolux 18kW Electric Tankless Water Heater

Best for: smart home integration and whole-house flow

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

This Electrolux unit delivers 18 kW of power at 240 volts, providing up to 4.2 GPM of hot water. It features smart Wi-Fi control via an app and Alexa compatibility. The device measures 18.7 x 14.1 x 14.1 inches and weighs 15.4 pounds. It is designed for whole-house use with simultaneous point-of-use support. You get precise temperature adjustments from 80°F to 140°F.

Pros

• 18 kW output at 240V for high flow
• Wi-Fi app and Alexa voice control
• Adjustable temperature range of 80°F to 140°F
• Compact dimensions of 18.7 x 14.1 x 14.1 inches

Cons

• Requires two 40A breakers and 8 AWG wiring
• 1-year warranty is shorter than some competitors
• Heavier build at 15.4 pounds

Good fit if

• You need smart remote temperature adjustment
• You have a 200-amp electrical panel
• You want Alexa voice control integration

Skip if

• You cannot install dual 40A circuits
• You prefer a lighter unit under 10 pounds
• You want a warranty longer than one year

Verdict: Electrolux 18kW WiFi Electric Tankless suits homes with robust electrical infrastructure seeking smart connectivity. It offers precise digital control and strong flow rates for simultaneous use.

6 Also great

Electrolux 18kW Electric Tankless Heater

Best for: Whole-house hot water with scale protection

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 18kW of power at 240V, providing up to 4.2 GPM of hot water. It features a lead-free copper core and an included scale inhibitor to protect the heating element. You can control it via WiFi or Alexa. The device adjusts power automatically to match demand, ensuring efficiency. It is designed for whole-house use, supporting two points simultaneously.

Pros

• 18kW output provides up to 4.2 GPM flow
• Includes external scale inhibitor to reduce buildup
• WiFi and Alexa voice control for easy adjustment
• Lead-free copper core for cleaner heating
• ETL Listed to UL 499 safety standards

Cons

• Requires 240V electrical connection
• Scale inhibitor cartridge needs annual replacement
• No remote control included in specifications

Good fit if

• You need whole-house hot water for two points
• You have hard water and want scale protection
• You prefer voice or app control for temperature

Skip if

• You only have 120V outlets available
• You want a point-of-use heater under 10kW
• You prefer a gas-powered unit

Verdict: Electrolux 18kW Electric Tankless Water Heater suits homes needing steady flow for multiple bathrooms. The included scale inhibitor and smart controls make it a durable option for hard-water areas.

7 Best commercial

VEVOR 30-Gallon 5000W Electric Water Heater

Best for: small commercial spaces needing steady hot water volume

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 rated at 5000 watts and 240 volts. It features a 40.2-inch height and weighs 74.5 pounds. The design includes an LED display and a rotary knob for temperature control. The enamel interior offers corrosion resistance, and the unit carries an IPX4 waterproof rating. It suits small commercial settings or families needing simultaneous hot water for multiple outlets.

Pros

• 30-gallon storage capacity for steady hot water supply
• 5000W heating element with 20mm foam insulation
• LED display and rotary knob for easy adjustment
• Enamel interior resists corrosion and high temperatures
• IPX4 waterproof rating for safety

Cons

• Significant bulk at 40.2 inches tall and 74.5 pounds
• 5000W power is lower than the 18kW alternatives on this list
• Requires 240V electrical connection

Good fit if

• You need a 30-gallon reservoir for multiple simultaneous outlets
• You have a small commercial space with adequate floor space
• You prefer manual knob control over digital interfaces

Skip if

• You require instant-on tankless performance without storage delay
• You have limited vertical clearance for a 40-inch unit
• You need higher wattage for rapid recovery rates

Verdict: VEVOR 30 Gal Electric Tank Water Heater provides reliable storage capacity for small commercial or family use. It fits buyers who prioritize steady volume over instant heating speed and have the space for a bulky tank.

Specifications side by side

Frequently asked questions

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