Best Westinghouse Tankless Water Heaters Under $300: 3 Spec-Based Picks

Quick picks

The best fit for you

• You want smart control for a single shower Westinghouse 11 kW Smart Wi-Fi Tankless Water Heater The 11 kW unit includes WiFi for app-based management.
• You need high capacity for an under-sink sink Westinghouse 8-Gallon 120V Electric Mini Tank This 8-gallon tank provides ample stored hot water.
• You want the most compact model on the list Westinghouse 11kW Wi-Fi Tankless Water Heater Weighing only 7.8 pounds, it is the lightest option.

Our 3 picks

1 Best overall

Westinghouse 11 kW Smart Wi-Fi Tankless Water Heater

Best for: Single-point showers with smart control needs

Fuel Type

Electric

Flow Rate

2.6 GPM

Wattage

11 kW

Voltage

240V

Temperature Control

86-140°F

Certification

ETL

View on Amazon: Westinghouse 11 kW Smart Wi-Fi Tankless Water Heater Affiliate link

This Westinghouse electric tankless water heater delivers 11 kW of power at 240V. It provides a flow rate of 2.6 GPM, making it suitable for single-point use like a shower. The unit features WiFi connectivity for remote temperature adjustments and includes ETL certification for safety. Its compact dimensions allow for easy wall mounting in tight spaces.

Pros

• 11 kW output provides 2.6 GPM flow
• WiFi control with voice assistant compatibility
• ETL certified with 4-layer safety protection
• Compact 12.6" x 9.56" x 9.56" size

Cons

• Requires a dedicated 60A double-pole breaker
• Uses 8 AWG wiring for installation
• Single-point capacity limits whole-house use

Good fit if

• You need hot water for a single fixture
• You want smart home integration for control
• You have the electrical capacity for 240V

Skip if

• You require simultaneous multiple shower usage
• You cannot install a 60A dedicated circuit
• You prefer gas fuel over electric power

Verdict: Westinghouse 11kW WiFi Tankless Heater is a compact, smart solution for single-point hot water needs. It fits buyers who have the necessary 240V electrical infrastructure and want app-based control. It is not suitable for whole-house applications or lower-amperage circuits.

2 Best budget

Westinghouse 8-Gallon 120V Electric Mini Tank

Best for: High-demand under-sink hot water needs

Fuel Type

Electric

Wattage

1440W

Capacity

8 Gallon

Voltage

120 V

Certification

CSA

Dimensions

20.8 x 17.3 x 17.3 inches

View on Amazon: Westinghouse 8-Gallon 120V Electric Mini Tank Affiliate link

This Westinghouse 8-gallon mini tank stores hot water for under-sink use. It runs on standard 120V power with a 1440W heating element. The unit measures 20.8 by 17.3 by 17.3 inches and weighs 28.2 pounds. It holds enough hot water for handwashing, dishes, or quick showers. The CSA certification ensures safety with dry-fire and over-temperature protection. This model suits busy households needing reliable point-of-use hot water.

Pros

• 8-gallon capacity handles heavy use and quick showers
• Standard 120V plug-in installation requires no special wiring
• CSA certified for safety with pressure relief protection
• 6-year tank warranty with triple-layer glass lining

Cons

• 1440W heating element recovers hot water slower than higher-wattage units
• Bulky dimensions require significant under-sink clearance space
• Limited to point-of-use applications rather than whole-house heating

Good fit if

• You need a dedicated hot water source for a kitchen or bathroom sink
• You want a simple plug-in unit without complex electrical upgrades
• You require a large 8-gallon reserve for multiple users

Skip if

• You need whole-house hot water for multiple simultaneous fixtures
• You have very limited vertical space under your sink
• You want instant-on tankless performance without storage recovery time

Verdict: Westinghouse 8 Gal Under Sink Heater provides ample hot water storage for high-demand sinks. It fits buyers who prioritize capacity and easy 120V installation over compact size or instant heating speed.

3 Also great

Westinghouse 11kW Wi-Fi Tankless Water Heater

Best for: Single sink hot water with app control

Fuel Type

Electric

Flow Rate

2.6 GPM

Wattage

11 kW

Voltage

240V

Temperature Control

86–140°F, 1°F increments

Certification

ETL

View on Amazon: Westinghouse 11kW Wi-Fi Tankless Water Heater Affiliate link

This Westinghouse 11kW unit provides instant hot water at 240V. It delivers up to 2.6 GPM when inlet water is warm, dropping to 1.4 GPM in colder conditions. The compact 12.8-inch body fits tight spaces like under sinks. You can control temperature precisely from 86°F to 140°F via the LED display or Wi-Fi app. It includes ETL certification and safety protections against overheating or dry firing.

Pros

• 11kW power with 240V connection
• Wi-Fi and app control
• Compact 12.8 x 3.58 x 8.9 inch design
• ETL certified safety features
• Precise 1°F temperature increments

Cons

• Flow rate drops significantly in cold inlet water
• Requires professional electrical installation
• Limited to point-of-use applications

Good fit if

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

Skip if

• You need high flow for a shower
• You only have 120V outlets available
• You want to install it yourself

Verdict: Westinghouse 11kW Electric Tankless Heater is a compact, app-controlled solution for single-fixture hot water needs. It fits well in tight spaces where you need precise temperature management without the bulk of a traditional tank.

Specifications side by side

How to choose the right one

1. Check your electrical panel

   Most Westinghouse tankless heaters require a dedicated 240V circuit with high amperage. The 11 kW models listed here need this specific voltage to operate safely and effectively. If your home only has standard 120V outlets, these units will not work. You must verify that your electrical panel can support the load before purchasing. The 8-gallon mini tank is the only exception, as it runs on standard 120V. Always consult a licensed electrician to confirm your panel’s capacity. Installing a 240V unit on the wrong circuit is dangerous and ineffective.

2. Match wattage to usage

   The 11 kW wattage on the top-ranked models is designed for single-point applications like one shower or one sink. It is not sufficient for whole-house hot water demands. If you need hot water for multiple fixtures simultaneously, these units will struggle to maintain temperature. The 8-gallon model offers stored water instead of instant heating, making it better for high-demand under-sink use. Choose the wattage that matches your actual hot water needs. Do not assume higher wattage solves flow issues if the unit is undersized for the fixture.

3. Consider smart features

   Two of the listed models include WiFi connectivity for app-based control. This feature allows you to manage settings remotely, which is useful for monitoring energy use or adjusting temperatures while away. If you do not need digital control, this feature may be unnecessary complexity. The 8-gallon mini tank lacks these smart capabilities, focusing instead on simple storage capacity. Decide if remote management is a priority for your household. The WiFi models offer precise temperature management through an app, adding convenience for tech-savvy users.

4. Evaluate physical dimensions

   Space constraints often dictate which unit fits your installation site. The 11 kW tankless models are compact, measuring roughly 9.5 inches wide and 12.6 inches tall. However, one variant is significantly thinner at 3.58 inches tall, weighing just 7.8 pounds. This ultra-slim design fits tight spaces where bulkier units cannot go. The 8-gallon mini tank is larger, measuring 17.3 inches square and 20.8 inches tall. Measure your installation area carefully before deciding. Ensure you have enough clearance for maintenance access and proper airflow around the unit.

5. Decide on storage vs instant

   You must choose between instant heating and stored hot water. The tankless models provide hot water on demand, saving space but requiring high power. The 8-gallon mini tank stores heated water, providing a buffer for high-demand sinks. This storage approach is easier on electrical systems but takes up more room. If you need continuous hot water for a shower, the tankless option is better. For an under-sink application with intermittent use, the 8-gallon tank is more practical. Your choice depends on whether you prioritize space savings or consistent supply.

Frequently asked questions

See also

• best westinghouse tankless water heaters with WiFi
• best westinghouse 11 kW tankless water heaters
• best tankless water heaters under 300
• best kerosene heaters under 300