Best Westinghouse Tankless Water Heaters with WiFi in 2026: 6 Picks
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Finding the best westinghouse tankless water heaters with WiFi requires careful attention to electrical capacity and flow rate. We compared 6 models based strictly on published specifications. The Westinghouse 24kW WiFi Tankless Water Heater leads this list because its 24 kW wattage supports strong whole-house flow for multiple fixtures. Each pick matches specific home needs, from under-sink sinks to large family bathrooms. You will see how voltage, size, and connectivity features differ across the lineup. Use this guide to decide which unit fits your space and power requirements.
Quick picks
The best fit for you
- You need whole-house hot water with smart control Westinghouse 24kW WiFi Tankless Water Heater The 24 kW wattage provides strong flow for multiple fixtures.
- You require high capacity for large families Westinghouse 10.3 GPM Natural Gas Tankless Heater The 199,000 BTU output supports simultaneous use of several faucets.
- You want precise control for handwashing Westinghouse 8kW Smart WiFi Tankless Water Heater The compact 8 kW unit fits under sinks and manages low flow.
Our 6 picks
Westinghouse 24kW WiFi Tankless Water Heater
Best for: whole-house WiFi hot water needs
- Features
- WiFi (what this guide is about)
- Fuel Type
- Electric
- Flow Rate
- Max 5.55 GPM
- Wattage
- 24 kW
- Voltage
- 240V
- Certification
- ETL
View on Amazon: Westinghouse 24kW WiFi Tankless Water Heater Affiliate link
This 24kW electric unit delivers up to 5.55 GPM for whole-house use. It connects to WiFi for remote app control and voice commands via Alexa or Google Home. The compact 17.1-inch height and 17-pound weight allow flush wall mounting. It requires a 240V supply and three 40-amp breakers. This model suits homes needing high flow rates with smart integration.
Pros
- 24kW power provides up to 5.55 GPM flow rate
- Smart WiFi enables remote temperature adjustment and usage monitoring
- Compact 17.1 x 13 x 4.3 inch design mounts flush to the wall
- Compatible with Alexa and Google Home for voice control
Cons
- Requires three separate 40-amp double-pole breakers for operation
- Needs 8 AWG wiring for electrical connections
- High amperage demand may require panel upgrades
Good fit if
- You need a high-flow whole-house solution with WiFi
- You have the electrical capacity for three 40-amp breakers
- You want voice control integration with smart home systems
Skip if
- You cannot install three dedicated 40-amp circuits
- You only need a single-point heater for one sink
- Your electrical panel lacks space for multiple high-amperage breakers
Verdict: Westinghouse 24kW Electric Tankless Heater offers strong whole-house flow and smart control for homes with adequate electrical capacity. It fits users who prioritize high GPM and app management over simple installation.
Westinghouse 10.3 GPM Natural Gas Tankless Heater
Best for: Whole-house hot water for large families
- Features
- WiFi (what this guide is about)
- Fuel Type
- Natural Gas
- Flow Rate
- 10.3 GPM
- BTU
- 199,000 BTU/hr
- Installation Location
- Indoor
- Temperature Control
- WiFi & APP control
View on Amazon: Westinghouse 10.3 GPM Natural Gas Tankless Heater Affiliate link
This Westinghouse unit delivers 10.3 GPM at 199,000 BTU for whole-house hot water. It uses natural gas and features WiFi app control for remote temperature adjustments. Designed for indoor installation, it supports up to seven fixtures simultaneously. The 30-liter capacity ensures steady flow. It suits large households needing high output and smart management for multiple bathrooms and appliances.
Pros
- High 10.3 GPM flow rate
- 199,000 BTU heating power
- WiFi and APP control
- Supports up to 7 fixtures
Cons
- Indoor installation only
- Non-condensing venting required
- Heavier at 56 pounds
Good fit if
- You need hot water for multiple bathrooms
- You have existing natural gas lines
- You want remote app control
Skip if
- You require outdoor installation
- You only need one sink
- You prefer propane fuel
Verdict: Westinghouse 10.3 GPM Natural Gas Tankless provides robust heating for large homes. It fits families needing simultaneous hot water for several fixtures.
Westinghouse 18kW 240V WiFi Tankless Heater
Best for: Whole-house use with smart app control
- Features
- WiFi (what this guide is about)
- Fuel Type
- Electric
- Flow Rate
- 4.2 GPM
- Wattage
- 18 kW
- Voltage
- 240V
- Temperature Control
- 86–140°F, 1°F increments
View on Amazon: Westinghouse 18kW 240V WiFi Tankless Heater Affiliate link
This Westinghouse 18kW electric unit delivers up to 4.2 GPM for whole-house use. It features Wi-Fi app control and precise 1°F temperature adjustments. The compact 18.7-inch design fits tight spaces. It requires a 240V, 75A electrical panel. This model suits homes needing reliable hot water with smart connectivity.
Pros
- 18kW heating element for whole-house capacity
- Wi-Fi app and voice assistant compatibility
- Precise 1°F temperature increments from 86–140°F
- Compact 18.7 x 14.17 x 3.94 inch footprint
Cons
- Requires a dedicated 75A circuit breaker
- Flow rate drops to 2.6 GPM in cold climates
- Professional installation is recommended for electrical safety
Good fit if
- You need a whole-house solution with smart controls
- You have a 240V, 75A electrical panel ready
- You want precise temperature adjustments via an app
Skip if
- You cannot install a 75A dedicated circuit
- You need higher flow rates in very cold regions
- You prefer a gas-powered heating system
Verdict: Westinghouse 18kW Electric Tankless Water Heater fits homes with strong electrical capacity that want smart, precise hot water control.
Westinghouse 8kW Smart WiFi Tankless Water Heater
Best for: Under-sink hot water with smart control
- Features
- WiFi (what this guide is about)
- Fuel Type
- Electric
- Wattage
- 8 kW
- Voltage
- 240 V
- Temperature Control
- 80°F-130°F
- Dimensions
- 6.9" x 8.1" x 2.5"
View on Amazon: Westinghouse 8kW Smart WiFi Tankless Water Heater Affiliate link
This Westinghouse unit delivers 8kW of heating power at 240V, designed for point-of-use under-sink applications. Its compact dimensions of 6.9 by 8.1 by 2.5 inches allow for installation in tight spaces. Smart WiFi control lets you adjust the temperature between 80°F and 130°F via an app or voice commands. It is optimized for single faucets, making it suitable for handwashing and dish rinsing rather than whole-house needs.
Pros
- 8kW electric heating element for instant hot water
- Smart WiFi control with Alexa and Google Home compatibility
- Compact size fits under sinks in tight spaces
- Separated heating element reduces scale buildup
- IPX4 waterproof rating for safety
Cons
- 8kW capacity is insufficient for shower use
- Requires a dedicated 40A circuit for installation
- Limited to single faucet point-of-use applications
Good fit if
- You need hot water for a kitchen or bathroom sink
- You want remote temperature control via a smartphone app
- You have limited space under the sink
Skip if
- You need to supply hot water for a shower
- You cannot install a dedicated 40A circuit
- You require a whole-house water heating solution
Verdict: Westinghouse 8kW WiFi Electric Heater is a practical under-sink solution for users who need precise, app-controlled hot water for handwashing or dish rinsing. It fits well in tight spaces but is not powerful enough for showering.
Westinghouse 11kW Smart Wi-Fi Tankless Water Heater
Best for: single-point applications like sinks or showers
- Features
- WiFi (what this guide is about)
- Fuel Type
- Electric
- Flow Rate
- 2.56 GPM
- Wattage
- 11kW
- Voltage
- 240V
- Temperature Control
- 86°F to 140°F, ±1°F
View on Amazon: Westinghouse 11kW Smart Wi-Fi Tankless Water Heater Affiliate link
This Westinghouse 11kW unit delivers up to 2.56 GPM at 240V, making it suitable for one-point use like a single shower or sink. It features WiFi control via app or voice commands, with temperature adjustments in 1° increments from 86°F to 140°F. The compact 14.2" H x 9.5" W design mounts flush to walls. It requires a 50A double-pole breaker and 8 AWG wiring for safe operation.
Pros
- 11kW heating element provides up to 2.56 GPM flow
- WiFi control with Alexa and Google Home compatibility
- Precise 1° temperature increments from 86°F to 140°F
- Compact 14.2" H x 9.5" W flush-mount design
Cons
- Limited to one-point use, not whole-house capacity
- Requires a dedicated 50A double-pole breaker
- Higher activation flow rate of 0.4 GPM may limit low-flow usage
Good fit if
- You need hot water for a single sink or shower
- You want remote temperature control via a smartphone app
- You have the electrical capacity for a 50A breaker
Skip if
- You need to supply hot water to multiple bathrooms simultaneously
- Your electrical panel cannot support a 50A double-pole breaker
- You require a whole-house heating solution with higher GPM
Verdict: Westinghouse 11kW Electric Tankless Water Heater is a compact, smart solution for single-point applications. It fits well in apartments or offices where space is tight and electrical upgrades are manageable.
Westinghouse 18kW Smart Electric Tankless Water Heater
Best for: homes with 75A electrical capacity
- Features
- WiFi (what this guide is about)
- Fuel Type
- Electric
- Flow Rate
- 4.2 GPM
- Wattage
- 18kW
- Voltage
- 240V
- Temperature Control
- 86°F to 140°F in 1° increments
View on Amazon: Westinghouse 18kW Smart Electric Tankless Water Heater Affiliate link
This Westinghouse APOLO unit delivers 18kW of power at 240V, providing up to 4.2 GPM of hot water. It features WiFi control for remote adjustments and voice commands via Alexa or Google Home. The device includes an LED display and a rotary knob for local settings. Its compact 17-inch height and 13-inch width allow for wall mounting. It is designed for homes with sufficient electrical capacity.
Pros
- 18kW output supports simultaneous use in 1-2 bathrooms
- WiFi control with Alexa and Google Home compatibility
- Temperature adjustable from 86°F to 140°F in 1° increments
- ETL certified with IPX4 waterproof rating
Cons
- Requires 75A electrical demand with two 40 AMP breakers
- High amperage requirement limits installation options
- Activation flow rate is 0.66 GPM
Good fit if
- You have the electrical capacity for 75A usage
- You want remote temperature control via an app
- You need hot water for 1-2 bathrooms
Skip if
- You cannot install two 40 AMP breakers
- You need more than 4.2 GPM flow rate
- You are looking for a gas-powered unit
Verdict: Westinghouse APOLO 18kW Electric is a solid choice for homes with adequate electrical infrastructure that value smart connectivity. It fits buyers who need reliable whole-house hot water without the bulk of a tank.
Specifications side by side
| Spec | Westinghouse 24kW WiFi Tankless Water Heater | Westinghouse 10.3 GPM Natural Gas Tankless Heater | Westinghouse 18kW 240V WiFi Tankless Heater | Westinghouse 8kW Smart WiFi Tankless Water Heater | Westinghouse 11kW Smart Wi-Fi Tankless Water Heater | Westinghouse 18kW Smart Electric Tankless Water Heater |
|---|---|---|---|---|---|---|
| Fuel Type | Electric | Natural Gas | Electric | Electric | Electric | Electric |
| Flow Rate | Max 5.55 GPM | 10.3 GPM | 4.2 GPM | not stated | 2.56 GPM | 4.2 GPM |
| BTU | not stated | 199,000 BTU/hr | not stated | not stated | not stated | not stated |
| Wattage | 24 kW | not stated | 18 kW | 8 kW | 11kW | 18kW |
| Installation Location | not stated | Indoor | not stated | not stated | not stated | not stated |
| Voltage | 240V | not stated | 240V | 240 V | 240V | 240V |
| Temperature Control | not stated | WiFi & APP control | 86–140°F, 1°F increments | 80°F-130°F | 86°F to 140°F, ±1°F | 86°F to 140°F in 1° increments |
| Certification | ETL | not stated | ETL | not stated | ETL | ETL |
| Dimensions | 17" x 13" x 4.3" | not stated | not stated | 6.9" x 8.1" x 2.5" | 14.2" x 9.5" x 3.5" | 17"H × 13"W × 4.3"D |
| Use | Whole House | not stated | Whole House | Under Sink | not stated | not stated |
| Venting Type | not stated | Non-Condensing | not stated | not stated | not stated | not stated |
| Features | WiFi | WiFi | WiFi | WiFi | WiFi | WiFi |
| Weight | 17 pounds | 56 pounds | 15.4 pounds | not stated | 10 pounds | not stated |
| Size | L-24 | not stated | M-18 | S-8 | S-11 | not stated |
| Color | Gray 24 | White | Gray 18 | Gray | Gray 11 | Gray |
| Model | WET-24K-G | not stated | ET018CA0G | WET-08K-B | WET-11K-G | APOLO |
How to choose the right one
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Match wattage to usage
Your electrical panel must support the unit’s wattage. The 24 kW model delivers strong whole-house flow but requires significant power. If your home lacks adequate capacity, consider the 18 kW option. For single sinks or under-sink use, the 8 kW unit suffices. Always verify your breaker size before installation. Higher wattage means more simultaneous hot water but demands a robust electrical system. Choose lower wattage for point-of-use applications where high flow is unnecessary.
-
Select fuel type wisely
Electric models offer easy indoor installation without venting. The 24 kW and 18 kW electric units provide whole-house coverage. Natural gas options deliver higher output without electrical upgrades. The 199,000 BTU gas heater suits large families needing simultaneous hot water. Gas units require proper venting and gas line access. Electric units need dedicated 240V circuits. Choose electric for simplicity and gas for higher capacity where electrical infrastructure is limited. Your existing utility connections dictate this choice.
-
Check unit dimensions
Space constraints often limit your options. The 8 kW unit measures just 2.48 inches wide, fitting tight under-sink spaces. The 11 kW model is compact at 9.5 inches wide. Whole-house electric units are wider, around 13 inches. The gas model is larger and heavier. Measure your installation area carefully. Ensure clearance for maintenance access. Smaller units suit apartments or offices. Larger units fit utility rooms. Verify dimensions before purchasing to avoid fitting issues during installation.
-
Verify voltage compatibility
All electric Westinghouse models require 240V circuits. This is non-negotiable for proper operation. Check your home’s electrical panel for available 240V breakers. The 24 kW unit needs a high-amperage breaker. The 18 kW unit also requires substantial power. Smaller units like the 8 kW still need 240V. Gas models do not rely on this voltage for heating. If you lack 240V outlets, consider gas or consult an electrician. Matching voltage ensures safe and efficient operation of your tankless heater.
-
Consider venting needs
Gas tankless heaters require proper venting. The 199,000 BTU model uses non-condensing venting. This affects where you can install it. Electric models do not produce exhaust and need no venting. This allows flexible indoor placement. Consider your home’s layout when choosing fuel type. Gas units may need exterior wall access for vents. Electric units can go anywhere with power. Venting complexity can influence installation costs and location choices. Plan this early in your selection process.
Frequently asked questions
Which Westinghouse tankless heater is best for whole-house use?
The Westinghouse 24kW WiFi Tankless Water Heater is the top choice for whole-house needs. It delivers strong flow rates suitable for multiple fixtures running at once. This electric unit operates on a 240V circuit and provides smart app control for precise temperature management.
Do Westinghouse tankless water heaters work with smart home apps?
Yes, all models listed here include built-in WiFi connectivity for smart control. You can manage settings and monitor usage through a dedicated app. This feature allows you to adjust temperatures remotely and track energy consumption from your smartphone or tablet.
What is the smallest Westinghouse tankless water heater size?
The Westinghouse 8kW Smart WiFi Tankless Water Heater is the most compact option. It measures just 2.48 inches in width and length, making it ideal for under-sink installations. This small footprint fits tight spaces while providing on-demand hot water for handwashing or dish rinsing.
Can I use a Westinghouse tankless heater for a shower?
The 11kW and 24kW electric models are suitable for shower applications. The 11kW unit is designed for single-point use, while the 24kW model supports whole-house flow including showers. Smaller units like the 8kW model lack the power needed for bathing.
Is there a gas option with WiFi from Westinghouse?
Yes, the Westinghouse 10.3 GPM Natural Gas Tankless Heater includes WiFi capabilities. It delivers 199,000 BTU of heating power for large families needing simultaneous hot water. This indoor unit uses non-condensing venting and provides robust performance without relying on high-voltage electrical circuits.
How much space does the Westinghouse 18kW heater take up?
The Westinghouse 18kW Smart Electric Tankless Water Heater measures 14.2 inches in width and length. The unit stands 3.94 inches tall, offering a compact profile for wall mounting. This design saves space while delivering whole-house hot water with smart app integration.