Westinghouse vs A. O. Smith Tankless Water Heaters: Which Brand Fits You?
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When you search for westinghouse vs a o smith tankless water heater options, you find two distinct approaches to on-demand hot water. Both brands deliver endless hot water for residential use. The main difference lies in their power source and placement. Westinghouse offers an electric unit for indoor whole-house use. A. O. Smith provides a high-output natural gas model designed for outdoor installation. Each serves different home layouts and energy needs.
Key differences
| Aspect | Westinghouse 24kW WiFi Tankless Water Heater | A. O. Smith 10 GPM Outdoor Condensing Tankless Heater |
|---|---|---|
| Fuel Type | Electric | Natural Gas |
| Flow Rate | 5.55 GPM | 10.0 GPM |
| Installation Location | Indoor | Outdoor |
| Venting Type | not listed | Condensing |
| Voltage / BTU | 240V | 199,000 BTU/hr |
| Smart Features | WiFi | Remote Controller |
Which one should you choose?
Choose Westinghouse 24kW WiFi Tankless Water Heater if
- You need a compact unit for indoor indoor installation with smart app control.
- You have sufficient electrical capacity for a 100A breaker setup.
- You want to heat water for a smaller household or apartment.
Choose A. O. Smith 10 GPM Outdoor Condensing Tankless Heater if
- You require high flow rates for a large home with multiple bathrooms.
- You have an outdoor space suitable for mounting a natural gas unit.
- You prefer condensing technology for higher energy efficiency.
Verdict: Choose the Westinghouse model if you are installing indoors and value smart home integration. Pick the A. O. Smith unit if you need maximum flow for a large family and have outdoor space for gas venting.
Westinghouse vs A. O. Smith Specs
Fuel type
The Westinghouse unit runs on electricity at 240V, requiring a 100A breaker and specific wiring. This makes it suitable for homes with adequate electrical capacity but no gas lines. The A. O. Smith model uses natural gas, delivering 199,000 BTU/hr. Gas heaters often provide higher energy efficiency and lower operating costs where gas is available. Your choice depends on your home’s existing infrastructure. If you have natural gas, the A. O. Smith option utilizes that fuel source directly. If you rely on electric service, the Westinghouse unit is the only viable path. This fundamental difference dictates installation requirements and long-term utility bills.
Flow rate
Capacity is critical for whole-house comfort. The A. O. Smith heater delivers up to 10.0 GPM. This high flow rate supports multiple simultaneous uses, such as showers and kitchen sinks, in larger households. The Westinghouse model provides a maximum flow rate of 5.55 GPM. While sufficient for smaller homes or apartments, it may struggle to maintain pressure if multiple fixtures are used at once. The A. O. Smith unit is better for high-demand scenarios. The Westinghouse unit is adequate for moderate use. You should choose the higher flow rate if you have a large family or many bathrooms.
Installation location
Placement options vary significantly between these two brands. The A. O. Smith unit is designed for outdoor installation and direct venting. This frees up indoor space and allows for flexible venting up to 100 feet. The Westinghouse heater is an indoor electric unit. It mounts flush against a wall, measuring 17 inches high and 13 inches wide. This compact footprint is ideal for closets or utility rooms where outdoor exposure is not an option. If you need an outdoor solution, the A. O. Smith is the clear choice. For indoor spaces, the Westinghouse unit fits standard residential layouts.
Smart features
Connectivity differs between the two models. The Westinghouse heater includes built-in Wi-Fi. You can control temperature and monitor usage via an app or voice commands through Alexa and Google Home. This offers convenience for modern smart homes. The A. O. Smith unit does not list Wi-Fi capabilities in its specifications. It includes a wall-mounted remote temperature controller for local adjustments. If remote control and app integration are important to you, the Westinghouse model provides this technology. The A. O. Smith relies on physical controls for setting temperatures.
Build quality
Durability and heat transfer materials are key considerations. The A. O. Smith unit features a commercial-grade copper heat exchanger. Copper provides 25 times better heat transfer than steel, which can improve efficiency and longevity. It also includes safety features like an overheat cut-off fuse and air-fuel ratio sensor. The Westinghouse specifications do not detail the internal heat exchanger material. It focuses on electrical components and smart connectivity. For users prioritizing robust heat exchange materials and advanced safety sensors, the A. O. Smith build is superior. The Westinghouse prioritizes electrical efficiency and smart control over material specifics in its data.
Choose the right heater for your home
Renters without gas lines
The Westinghouse unit runs on 240V electricity, so you do not need gas lines or outdoor venting. Its compact 17-inch height fits tight spaces. You get smart Wi-Fi control via an app. This electric model delivers 5.55 GPM, which handles simultaneous sink and shower use in smaller homes or apartments efficiently.
Large family homes
The A. O. Smith model delivers a high 10.0 GPM flow rate. This capacity supports up to four bathrooms in southern climates. Its 199,000 BTU natural gas burner provides consistent heat for multiple users. You get a copper heat exchanger for better durability. This unit is designed for high-demand residential households.
Outdoor installation needs
This A. O. Smith heater is built for outdoor placement. It features direct venting up to 100 feet using standard PVC or CPVC pipes. You do not need indoor space for installation. The unit includes a wall-mounted temperature controller and advanced diagnostics. This outdoor design saves interior square footage for other uses.
The products compared
Westinghouse 24kW WiFi Tankless Water Heater
Best for: small homes with 100A electrical capacity
- Fuel Type
- Electric
- Flow Rate
- Max 5.55 GPM
- Wattage
- 24 kW
- Voltage
- 240V
- Certification
- ETL
- Dimensions
- 17" x 13" x 4.3"
View on Amazon: Westinghouse 24kW WiFi Tankless Water Heater Affiliate link
This Westinghouse 24kW electric unit delivers up to 5.55 GPM at 240V. Its compact 17 by 13 by 4.3-inch design mounts flush to the wall. Smart Wi-Fi lets you adjust settings via app or voice commands. It suits whole-house needs in apartments or small homes. You get instant hot water with a low 0.79 GPM starting flow rate. This model requires specific electrical wiring and breakers for safe operation.
Pros
- High 5.55 GPM flow rate for simultaneous use
- Smart Wi-Fi with Alexa and Google Home support
- Compact 17 by 13 by 4.3-inch flush-mount design
- Low 0.79 GPM starting flow rate
Cons
- Requires 100A electrical capacity with three 40A breakers
- Uses 8 AWG wire for installation
- Electric model limits use in areas with high electricity costs
Good fit if
- You need whole-house hot water in a small home
- You want smart app control for temperature adjustments
- You have the required 100A electrical setup ready
Skip if
- You only have a standard 40A circuit available
- You prefer natural gas over electric heating
- You need a unit larger than 24kW capacity
Verdict: Westinghouse 24kW Electric Tankless Heater fits buyers who want smart control and high flow in a compact electric unit. It works best for small homes with the necessary 100A electrical infrastructure.
A. O. Smith 10 GPM Outdoor Condensing Tankless Heater
Best for: Whole-house hot water in outdoor settings
- Fuel Type
- Natural Gas
- Flow Rate
- 10.0 GPM
- BTU
- 199,000 BTU/hr
- Installation Location
- Outdoor
- Dimensions
- 23.6 x 17.8 x 17.8 inches
- Venting Type
- Condensing
View on Amazon: A. O. Smith 10 GPM Outdoor Condensing Tankless Heater Affiliate link
This outdoor natural gas unit delivers up to 10.0 GPM of hot water. It uses condensing technology to reach a 0.94 UEF. The 199,000 BTU output supports three bathrooms in northern climates. You get a wall-mounted remote and flexible venting up to 100 feet. The copper heat exchanger resists corrosion better than steel.
Pros
- 10.0 GPM flow rate for whole-house use
- 0.94 UEF energy efficiency rating
- 199,000 BTU/hr heating capacity
- Commercial-grade copper heat exchanger
- Includes wall mount temperature remote controller
Cons
- Requires outdoor installation only
- Heavy at 59 pounds
- Professional installation recommended
Good fit if
- You need hot water for three bathrooms
- You have outdoor space for venting
- You want high efficiency ratings
Skip if
- You need indoor installation
- You want propane fuel
- You prefer a lighter unit
Verdict: A. O. Smith 10 GPM Outdoor Gas Heater fits homes needing high flow for multiple bathrooms. It suits buyers who have outdoor space and want efficient condensing technology.
Specifications side by side
| Spec | Westinghouse 24kW WiFi Tankless Water Heater | A. O. Smith 10 GPM Outdoor Condensing Tankless Heater |
|---|---|---|
| Fuel Type | Electric | Natural Gas |
| Flow Rate | Max 5.55 GPM | 10.0 GPM |
| BTU | not stated | 199,000 BTU/hr |
| Wattage | 24 kW | not stated |
| Installation Location | not stated | Outdoor |
| Voltage | 240V | not stated |
| Certification | ETL | not stated |
| Dimensions | 17" x 13" x 4.3" | 23.6 x 17.8 x 17.8 inches |
| Use | Whole House | not stated |
| Venting Type | not stated | Condensing |
| Features | WiFi | not stated |
| Weight | 17 pounds | 59 pounds |
| Size | L-24 | not stated |
| Color | Gray 24 | White |
| Model | WET-24K-G | ATO-540H-N 100 |
Frequently asked questions
Can I install the Westinghouse unit indoors?
Yes, the Westinghouse 24kW model is designed for whole-house indoor use. It operates on 240V electricity, so it does not require gas lines or outdoor venting. Its compact dimensions of 13 by 17.1 inches allow it to fit in tight interior spaces like closets or utility rooms.
Is the A. O. Smith heater weatherproof?
Yes, the A. O. Smith 10 GPM unit is built for outdoor installation. It features condensing technology and is rated for exterior placement. This design protects the internal components from the elements while delivering high-capacity hot water for homes with multiple bathrooms.
Which brand offers smart home connectivity?
Westinghouse includes WiFi connectivity in its 24kW electric model. This feature allows you to monitor and control the water heater remotely via an app. A. O. Smith does not list smart features in its outdoor condensing specifications, focusing instead on raw output capacity.
How much space does each unit take up?
The Westinghouse heater is smaller, measuring 13 inches wide and 17.1 inches tall. It weighs only 17 pounds. The A. O. Smith model is larger and heavier, with a footprint of 17.8 inches square and a height of 23.6 inches, weighing 59 pounds due to its gas components.
Which heater provides more hot water flow?
The A. O. Smith unit offers a higher flow rate of 10 gallons per minute. This makes it better for simultaneous use in multiple bathrooms. The Westinghouse electric model is rated for whole-house use but focuses on efficiency for smaller electrical loads rather than maximum GPM output.
Do I need gas lines for the Westinghouse heater?
No, the Westinghouse 24kW heater runs entirely on electricity. It requires a 240V power source and a 100A electrical capacity. You do not need natural gas lines or exhaust venting, making it a flexible option for homes without existing gas infrastructure.
Which unit is better for a small home?
The Westinghouse 24kW electric heater is ideal for small homes with adequate electrical capacity. Its compact size and WiFi controls suit modern residential needs. The A. O. Smith gas model is better suited for larger homes needing high-volume hot water in outdoor settings.