Westinghouse Tankless Water Heater Electric Alternatives: 6 Similar Picks Compared

How the Alternatives Compare

Rheem 18kW 240V Electric Tankless Water Heater

The Rheem RTEX-18 targets whole-house needs rather than single sinks. Its 18kW output far exceeds the Westinghouse 6.5kW unit, allowing it to serve multiple fixtures simultaneously. You get precise thermostatic control and durable copper heating elements. The trade-off is size; the Rheem is larger and heavier. It measures 14.5 by 18.5 inches and weighs 14.8 pounds. This unit suits buyers who need reliable flow for showers or multiple bathrooms. It lacks the compact under-sink form factor of the Westinghouse. You must ensure your electrical panel supports the higher amperage. It is the better choice for whole-home coverage.

Camplux 6000W 240V Point-of-Use Tankless Water Heater

The Camplux TE06ProN5 is a budget-friendly point-of-use option similar to the Westinghouse. It offers 6000W of power, slightly less than the Westinghouse 6.5kW. This makes it suitable for single sinks in tight spaces. The unit is compact, measuring 7 by 10 inches, and weighs only 4.9 pounds. It fits easily under vanities where space is limited. You get precise temperature control without the smart app features found in the Westinghouse. There is no Wi-Fi connectivity or Alexa integration. This unit is ideal if you want instant hot water for a single faucet without needing remote monitoring. It is a straightforward, no-frills solution for basic point-of-use heating.

VEVOR 30-Gallon 5000W Electric Water Heater

The VEVOR 30-Gallon unit is a storage heater, not tankless. It provides 30 gallons of hot water, which is ideal for large families or small commercial use. It prioritizes volume over instant-on technology. The unit is much larger, measuring 17.7 by 40.2 inches and weighing 74.5 pounds. It requires significant space for installation. You get reliable hot water for simultaneous usage across multiple fixtures. This is a better choice if you need a large reserve of hot water. It does not offer the endless hot water of a tankless system. The installation is more complex due to its size and weight. It suits buyers who prioritize capacity over compact design.

Thermomate 18kW Electric Tankless Water Heater

The Thermomate ET180 is a high-output 18kW tankless heater for whole-home use. It matches the Rheem in power but differs in design. It is built for homes with strong electrical infrastructure. The unit measures 13.1 by 17.1 inches and is designed for indoor installation. You get consistent hot water for busy bathrooms and high-flow needs. It lacks the smart app control and Wi-Fi connectivity of the Westinghouse. There is no remote scheduling or status monitoring. This unit is ideal for users who need maximum flow rates and precise temperature settings. It is not suitable for under-sink installation due to its size. It serves as a robust whole-house solution.

ThermoMate 14kW Electric Tankless Water Heater

The Thermomate EH140 is a 14kW tankless heater designed for compact indoor installations. It offers more power than the Westinghouse 6.5kW unit but is larger. It measures 11.2 by 15.9 inches and weighs 13 pounds. This unit is suitable for single fixtures or light multi-point use in compact homes. You get reliable indoor hot water without the need for a large storage tank. It lacks the smart features and app control found in the Westinghouse. There is no Wi-Fi integration or Alexa compatibility. This unit is a good choice for small households needing dependable heating. It is not ideal for point-of-use under-sink installation due to its dimensions.

Stiebel Eltron Tempra 29 Plus 28.8kW Tankless

The Stiebel Eltron Tempra 29 Plus is a high-output 28.8kW tankless heater. It is designed for homes with robust electrical infrastructure. The unit measures 16.6 by 14.5 inches and weighs 19 pounds. It provides whole-home hot water with precise temperature control. You get reliable performance for high-demand households. It lacks the compact form factor and smart app features of the Westinghouse. There is no Wi-Fi connectivity or remote monitoring capability. This unit is ideal for buyers who need maximum power output and consistent flow. It is not suitable for under-sink installation. It serves as a premium whole-house solution for those with ample electrical capacity.

Quick picks

Our 7 picks

1 Best overall

Westinghouse 6.5kW 240V Under-Sink Tankless Water Heater

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

Fuel Type

Electric

Wattage

6.5 kW

Voltage

240V

Temperature Control

80–130°F, 1°F increments

Dimensions

6.9 x 8.1 x 2.5 inches

Use

Under Sink

View on Amazon: Westinghouse 6.5kW 240V Under-Sink Tankless Water Heater Affiliate link

This Westinghouse unit delivers 6.5kW of power at 240V for point-of-use hot water. It features a compact 6.9 x 8.1 x 2.5 inch design that fits under most sinks. You get precise temperature control from 80 to 130°F in 1°F increments. The device includes Wi-Fi app control and smart home compatibility. It is designed for single sink or vanity use, not showers.

Pros

• 6.5kW output for instant hot water
• Wi-Fi app and Alexa control
• Precise 1°F temperature increments
• Compact 6.9 x 8.1 x 2.5 inch size

Cons

• 6.5kW is insufficient for showers
• Requires 30A two-pole breaker
• Limited to single fixture use

Good fit if

• You need hot water for a single sink
• You want remote temperature scheduling
• You have limited under-sink space

Skip if

• You need hot water for a shower
• You cannot install a 30A circuit
• You need to supply multiple fixtures

Verdict: Westinghouse 6.5kW Electric Tankless Heater is ideal for users needing instant hot water for a single sink or vanity with smart control features. It does not provide enough flow for showers or whole-house use.

2 Also great

Rheem 18kW 240V Electric Tankless Water Heater

Best for: Whole-house hot water with precise temperature accuracy

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 a 18 kW, 240V electric tankless water heater designed for whole-house use. It delivers up to 4.4 GPM with copper immersion heating elements. The unit features an external digital thermostat with ±1°F accuracy and self-modulation technology that adjusts power to match demand. Its compact dimensions of 3.5 by 14.5 by 18.5 inches allow for flexible mounting. This model suits households needing reliable, on-demand hot water with precise temperature control.

Pros

• 18 kW output provides up to 4.4 GPM flow rate
• Digital thermostat offers ±1°F temperature accuracy
• Self-modulation adjusts power to meet hot water demand
• Durable copper immersion heating elements are field serviceable
• Compact size fits in small utility spaces

Cons

• 18 kW is lower than the 28.8 kW Stiebel Eltron option
• Requires 240V electrical circuit for operation
• No remote control or Wi-Fi connectivity listed

Good fit if

• You need a whole-house unit with precise temperature control
• You have a 240V electrical circuit available
• You want field-serviceable copper heating elements

Skip if

• You require a higher flow rate than 4.4 GPM
• You only have 120V outlets available
• You want smart home integration features

Verdict: Rheem RTEX-18 18kW Electric Tankless Heater delivers precise temperature control and reliable flow for whole-house needs. It fits buyers who prioritize accurate thermostatic settings and durable copper elements over maximum power output.

3 Best budget

Camplux 6000W 240V Point-of-Use Tankless Water Heater

Best for: Single sink point-of-use installation

Fuel Type

Electric

Flow Rate

1.07 GPM at 35°F rise

Wattage

6000 W

Voltage

240 V

Certification

ETL Listed

Dimensions

10.95 x 7.4 x 2.52 inches

View on Amazon: Camplux 6000W 240V Point-of-Use Tankless Water Heater Affiliate link

This Camplux unit delivers instant hot water at a single point of use. It operates on 240V with 6000W output. The compact design measures 10.95 by 7.4 by 2.52 inches. It provides 1.07 GPM at a 35°F rise. The LCD display shows real-time temperature. It suits kitchen or bathroom sinks where space is tight.

Pros

• 6000W heating output for instant hot water
• Compact 10.95 x 7.4 x 2.52 inch size
• LCD display with real-time temperature reading
• Self-modulating technology adjusts power to flow

Cons

• Low flow rate of 1.07 GPM limits usage
• Point-of-use design restricts whole-home application
• No remote control or smart connectivity listed

Good fit if

• You need hot water for a single sink
• You have limited space under a counter
• You require a compact 240V electric unit

Skip if

• You need to supply multiple fixtures simultaneously
• You require a flow rate above 1.5 GPM
• You want whole-house hot water coverage

Verdict: Camplux 6000W 240V Electric Tankless fits tight spaces and single-sink needs. It offers precise temperature control without taking up floor space.

4 Best commercial

VEVOR 30-Gallon 5000W Electric Water Heater

Best for: Small commercial use or large families

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 heater designed for families of three to five people. It operates at 5000 watts and 240 volts. The 20 mm foam insulation helps maintain temperature and save energy. An LED display and rotary knob allow for easy adjustment. Its IPX4 rating and multiple safety protections make it suitable for small commercial use or busy households.

Pros

• 30-gallon capacity supports simultaneous use at multiple outlets
• 20 mm thick foam insulation minimizes heat loss
• LED display shows heating status clearly
• IPX4 waterproof rating for safety

Cons

• 5000 watt output is lower than the 14kW to 29kW tankless alternatives on this list
• Requires 240V electrical connection
• 74.5 pound weight adds significant installation weight

Good fit if

• You need hot water for a family of three to five people
• You require a unit for small commercial applications
• You want simultaneous hot water at multiple sinks or showers

Skip if

• You need instant hot water without stored reserves
• You only have a 120V electrical circuit available
• You want a compact unit that fits under a single sink

Verdict: VEVOR 30 Gal Electric Tank Heater provides reliable hot water storage for larger households or small businesses. It fits buyers who prioritize volume and simultaneous usage over instant-on tankless technology.

5 Also great

Thermomate 18kW Electric Tankless Water Heater

Best for: High-flow needs with adequate electrical capacity

Fuel Type

Electric

Flow Rate

Up to 4.4GMP

Wattage

18kW

Installation Location

Indoor

Voltage

240V

Temperature Control

80°F to 140°F, ±1°F

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

This ThermoMate unit delivers 18kW of power at 240V, heating water in three seconds with a flow rate up to 4.4 GPM. It features self-modulating technology for 99.8% efficiency and digital temperature control in 1-degree increments from 80°F to 140°F. The compact design mounts on walls, saving floor space. It suits households needing reliable instant hot water with precise temperature adjustments and energy savings.

Pros

• 18kW output provides up to 4.4 GPM flow rate
• Digital display allows 1-degree temperature adjustments
• 99.8% efficient self-modulating technology
• Heating element separated from water tube to reduce scale

Cons

• Requires two double-pole 40A breakers and 8AWG wire
• Maximum temperature limited to 140°F
• Indoor installation only

Good fit if

• You need high flow rates for multiple fixtures
• You want precise digital temperature control
• You have the electrical capacity for 80A service

Skip if

• You only have a single 40A breaker available
• You need outdoor installation capability
• You require temperatures above 140°F

Verdict: ThermoMate 18kW Electric Tankless Heater fits homes with strong electrical infrastructure that demand high flow rates and precise temperature settings. It delivers consistent hot water for busy bathrooms.

6 Best 14 kw

ThermoMate 14kW Electric Tankless Water Heater

Best for: compact indoor installations

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 240 volts. Its compact 15.9 by 11.2 by 3-inch frame mounts easily on walls. The digital touch control adjusts temperatures between 86°F and 131°F. This indoor model suits small homes or apartments. It requires a dedicated 60-amp circuit. The cast aluminum heating block resists scale buildup for longer life.

Pros

• High flow rate of 3.4 GPM
• Compact wall-mount dimensions
• Digital touch temperature control
• ETL listed for safety

Cons

• Requires a dedicated 60-amp circuit
• Uses standard 1/2-inch NPT connections
• Indoor installation only

Good fit if

• You need a compact unit for tight spaces
• You want digital temperature precision
• You have the required electrical capacity

Skip if

• You cannot install a 60-amp breaker
• You need outdoor weatherproofing
• You require gas fuel options

Verdict: Thermomate 14kW Electric Tankless Heater fits small households needing reliable indoor hot water. It works well for single fixtures or light multi-point use in compact homes.

7 Best premium

Stiebel Eltron Tempra 29 Plus 28.8kW Tankless

Best for: Whole-home hot water with high electrical capacity

Fuel Type

Electric

Wattage

28.8 kW

Voltage

208 V, 240 V

Dimensions

14.5 x 16.6 x 4.63 in

Use

Whole House

Weight

19 pounds

View on Amazon: Stiebel Eltron Tempra 29 Plus 28.8kW Tankless Affiliate link

The Stiebel Eltron Tempra 29 Plus delivers 28.8 kW of electric power at 240 volts. It provides continuous hot water for whole-home use. The unit features two temperature memory presets for easy adjustment. It requires hard-wired 240-volt service with three 40-amp breakers. This model suits homes needing high capacity and precise control.

Pros

• 28.8 kW output at 240 volts
• Two temperature memory presets
• Continuous on-demand hot water
• Compact 14.5 x 16.6 inch footprint

Cons

• Requires three 40-amp breakers
• Needs 200-amp total electrical service
• Hard-wired installation only

Good fit if

• You need high-capacity whole-home heating
• You have a 200-amp electrical panel
• You want precise temperature presets

Skip if

• You lack space for three breakers
• You have a 100-amp electrical service
• You prefer plug-in convenience

Verdict: Stiebel Eltron Tempra 29 Plus 28.8 kW is a high-output electric heater for homes with robust electrical infrastructure. It fits buyers who need reliable whole-home hot water and precise temperature control.

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Frequently asked questions

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