AO Smith Tankless Water Heater Reviews – Which Heater Is Worth Your Money? 2022

Are you planning to install a new water heater but unsure which company to select? Have you ever heard about A.O. Smith?

Today, we’re going to share detailed AO smith tankless water heater reviews to help you choose the right product for your needs.

A.O. Smith is one of the leading water heater companies globally.

They are famous for distributing first-class products manufactured using cutting-edge technologies and fulfilling the requirements of modern users.

Their products outshine from competitors. This firm provides a complete range of water heating systems, including gas, electric, tank, tankless, and solar.

So it does not matter what your personal needs are; you will easily find a device. So, let’s have a look at their best products.

AO Smith Tankless Water Heater Reviews

AO Smith ATO 310 P Non Condensing Residential9.8

AO Smith ATO-310-P Non-Condensing ResidentialFeature:

  • Incorporated anti-freeze technology
AO Smith ATI 340H N 8 GPM Residential9.5

AO Smith ATI-340H-N 8 GPM ResidentialFeature:

  • Factory-installed power cord
AO Smith EJC 6 Residential Electric Water Heater9.5

AO Smith EJC-6 Residential Electric Water HeaterFeature:

  • Sturdy tamper-resistant brass drain valve
AO Smith GPVT 40 Residential Natural Gas Water Heater9.5

AO Smith GPVT-40 Residential Natural Gas Water Heater Feature:

  • Multipurpose power vent design
A.O. Smith GCR 50 ProMax Plus High Efficiency Gas Water Heater9.4

A.O. Smith GCR-50 ProMax Plus High Efficiency Gas Water HeaterFeature:

  • Blue Diamond glass coating for corrosion resistance
A.O. Smith GCG 50 ProMax Tall Gas Water Heater 50 gal9.5

A.O. Smith GCG-50 ProMax Tall Gas Water Heater, 50 gal Feature:

  • It can be fixed anywhere in the residence

1. AO Smith ATO-310-P Non-Condensing Residential

If you’re looking for a non-condensing tankless appliance for your residence, this unit is a keeper.

It is tiny and compact and weighs only 38 pounds. Therefore, you can easily find a perfect storage spot for it.

Best Overall
AO Smith ATO 310 P Non Condensing Residential

AO Smith ATO-310-P Non-Condensing Residential


  • Incorporated anti-freeze technology
  • Overheat cutoff fuse
  • Inlet and outlet thermistors for temperature control

The stainless steel body is insulated, shielding the components inside.

The non-condensing technology is supremely energy-smart. This unit has a 0.82 energy factor.

Its heat is commendable, and the temperature stays consistent since there’s enough balance between the heat allocation and flor rater.

In case of overheating, the fuse will activate for the better performance of the heater.

If we talk about its protection traits, this premium quality device does not dissatisfy.

It integrates overheating fuse for lowering the hazard of scalding.

Besides, it includes inlet and outlet thermistors that permit you to regulate the water temperature 24/7.

It also equips anti-freeze technology and maintains the pipe functions.

The installation and operating process of it are straightforward.

You can manually reset the high limit as per your requirements.

Best of all, it is covered by a 5-year warranty for parts and a 12-year warranty for the heat exchanger.


  • Power source: Manual
  • Heat output: 190,000 BTUs
  • Product dimensions: 7.75 x 13.75 x 20.25 inches


  • Lightweight
  • Sleek and compact design
  • Multiple safety features
  • Well-built


  • The water flow rate is a little low
  • Must be installed by a professional

Note: This AO Smith 14kw tankless water heater reviews manages to be a dependable appliance for folks who value the non-condensing technology.
It comes at a bit high price, but it’s worth every single penny.  

2. AO Smith ATI-340H-N 8 GPM Residential

This AO Smith tankless water heater reviews has grabbed our attention because of its 8 GPM flow rate and low profile.

Great Value
AO Smith ATI 340H N 8 GPM Residential

AO Smith ATI-340H-N 8 GPM Residential


  • 8 GPM flow rate
  • Built-in temperature controller
  • Respects lead-free standards
  • Factory-installed power cord

It boasts an integrated temperature controller and power cord deployed in the factory.

You can utilize category 3 or 4 power direct venting with 3 or 4 size.

It does not have any pilot light, thanks to the electric ignition.

It contains various safety features that describe the sturdiness of this premium device.

Plus, it has constant temperature monitoring, an air-fuel ratio rod, and overheat cutoff fuse.

On the other hand, the built quality of AO Smith ATI-340H-N is of the utmost quality.

The primary heat exchanger is made with commercial-grade copper.

However, the secondary heat exchanger is made with stainless steel.

The primary heat exchanger is accountable for guaranteeing better heat transmission and corrosion resistance.

You can take advantage of it for 2.5 bathrooms in northern areas and 3.5 bathrooms in southern areas.

Furthermore, you can elevate it 10,100 feet above sea level.

It features a 0.95 energy factor. It is designed for the indoor mounting only.

A nice thing about it is that it complies with ultra-low NOx regulations and has a 15-year heat exchanger warranty.


  • Power source: Battery and wind-powered
  • Maximum BTU Input: 180,000 BTUs


  • Powerful and reliable unit
  • Compact and slim design
  • Multiple protection features
  • Highly energy efficient


  • High price
  • Indoor installation only
  • A bit heavyweight

Note: If you are after a durable, reliable, and easy to run device, AO Smith ATI-340H-N is a perfect choice.
It contains multiple safety features for you and your loved ones’ security.
It’s a bit expensive, but it will win your heart with its high performance.

3. AO Smith EJC-6 Residential Electric Water Heater

This AO Smith hot water heater reviews arrive with a slim and compact design that is highly suitable for mounting in spots with limited space.

Premium Choice
AO Smith EJC 6 Residential Electric Water Heater

AO Smith EJC-6 Residential Electric Water Heater


  • Side installation plumbing and electrical connections
  • Durable materials
  • Sturdy tamper-resistant brass drain valve

The plumbing and electrical attachments present in its side allow it to adjust into crawl-worthy settings, such as attics, beneath a cabinet or sink.

The installation and operation process of this superior quality heater is very easy.

You can take advantage of it for point of use applications.

With a 6-gallon capacity, it successfully distributes an adequate warm water volume to sustain a small residence.

However, if you have a large family, it won’t be able to meet your needs.

You can deploy multiple devices in your household to get the job done.

It features a 5-year guarantee for the container and parts.

Its downside is that it lacks energy star certification, but it’s compatible with amperage.

In a nutshell, it is a highly endorsed model from a world-class company.

We assure you that you will be satisfied with its purchase.  


  • Power source: Battery powered
  • Product weight: 25.59 pounds
  • Material: Brass


  • Reasonable price
  • Insulated to avert heat loss
  • Made for installation in tighter spaces
  • Environment-friendly insulation
  • Factory-built relief valve


  • Not designed for commercial applications
  • Smaller capacity
  • Lacks energy star certification

Note: The A.O. Smith EJC-6 is one of the best A.O. Smith electric water heaters.
Its compact design simplifies its mounting in tighter locations.
Its flow rate is smaller, but it can perfectly meet the hot water needs of a small family.

4. AO Smith GPVT-40 Residential Natural Gas Water Heater

This superior quality water heating system outperforms its category of gas devices for being larger in its container capacity and high energy efficiency.

AO Smith GPVT-40 Residential Natural Gas Water Heater

AO Smith GPVT 40 Residential Natural Gas Water Heater


  • Works with natural gas
  • Equips C3 technology
  • Hot surface burning
  • Multipurpose power vent design

It has a resilient build, which makes it long-lasting.

Moreover, it’s super easy to install with diverse deployment options. If you want, you can mount it yourself.

We like it because it’s eco-friendly with its insulation that inhibits heat loss and near to zero NOx emissions.

AO Smith GPVT-40 arms C3 technology that can identify combustible vapors and disable the burner to avert fire hazards.

The display is very user-friendly and has an easy to use interface.

The LED light shows information about its working and diagnostics.

It weighs 166 pounds, so it’s very heavyweight than other devices. 


  • Product weight: 166 Pounds
  • Power source: Gas
  • Product dimensions: 20.5 x 20.5 x 63 inches


  • User-friendly water heater
  • Energy star qualified device
  • Turn able blower outlet
  • It comes with a 40-gallon tank


  • Produces loud noise while working
  • It takes some time to heat water
  • The gas line from the valve to the igniter is long

Note: If you need a gas-fired unit for your household, then the AO Smith tankless water heater reviews won’t disappoint you.
It has a 40-gallon tank, so it can effortlessly fulfill the hot water needs of a medium-sized family.
Also, it offers various mounting options. Best of all, it’s easy to use, eco-friendly, and highly energy efficient.

5. A.O. Smith GCR-50 ProMax Plus High Efficiency Gas Water Heater

The AO Smith hybrid hot water heater reviews are for you if you seek a model that can offer long-term value and decrease your utility expenditures.

A.O. Smith GCR-50 ProMax Plus High Efficiency Gas Water Heater

A.O. Smith GCR 50 ProMax Plus High Efficiency Gas Water Heater


  • Blue Diamond glass coating for corrosion resistance
  • Dynaclean diffuser dip tube for lime and sediment buildup reduction
  • Complies with all NAECA regulations

It’s identical to AO Smith XCR-50 ProMax appliance; however, it boasts a blue diamond glass coating that provides improved corrosion resistance to glass lining.

Besides, it comes with an electronic gas valve that utilizes a thermopile to generate power.

The power aids in regulating the electronic gas control without requiring power from an external source.

On the other hand, it contains superior quality components and guarantees gas fuel is used in the most efficient way.

Its recovery level is quite high. Also, it’s an excellent option for a big household with a constant demand for warm water.

The compact design makes its deployment easier in any space. This device can vent up to forty feet.

Additionally, it has two-pipe combustion systems that pull clean air excluding problems connected with indoor mounting.


  • Product dimensions: 22 x 22 x 57.25 inches
  • Tank capacity: 50 Gallons
  • Power source: Wind power


  • The precise and fast operating mechanism
  • Maximum warm water output
  • Industry-grade glass lining


  • It does not have a LED display
  • Fire risk or damage may occur if you won’t use it accurately  

Note: This appliance can meet the needs of big households.
It resists corrosion outstandingly and creates the power needed to function without any external power source.
It features a precise working mechanism and can lower lime and sediment accumulation.

6. A.O. Smith GCG-50 ProMax Tall Gas Water Heater, 50 gal

The AO Smith tankless gas water heater reviews certainly deserve a spot in any list that hoards the best 50-gallon units.

A.O. Smith GCG-50 ProMax Tall Gas Water Heater, 50 gal

A.O. Smith GCG 50 ProMax Tall Gas Water Heater 50 gal


  • Blue Diamond glass coating offers rust resistance
  • Boasts two-pipe combustion systems that pull air from outside the house
  • It can be fixed anywhere in the residence
  • Self-powered electronic gas valve

It’s similar to AO Smith GCR-50LP and AO Smith XCR-50 water heaters.

This device has a blue diamond glass coating that delivers extraordinary resistance to rust, all praises to its glass lining.

Moreover, it features an internal microprocessor that provides tighter differentials and innovative operating parameters for swifter heating response and correct detecting.

On the flip side, this model comes with an electronic gas control that integrates an LED status indicator.

The indicator observes system operation and diagnostics.

Also, its anode rods have a stainless steel core that enhances the rods’ lifespan.

That permits improved boiler protection for significantly longer than regular anode rods.


  • Power Source: Wind power
  • Product Dimensions: 21 x 21 x 60.75 inches
  • Capacity: 50 gallons


  • Lowers lime and sediment build-up
  • Helps in providing maximum warm water
  • Complies with all NAECA standards and rules
  • Perfect for bigger families


  • Not a power vent device

Note: A.O. Smith GCG-50 is definitely one of the most reliable water heaters out there.
The tank has the capacity to store 50 gallons of hot water, so you can be certain that you will never run out of hot water.
Its price is higher, but it’s totally worth it.

How AO Smith Stands Out From Competitors?

AO Smith is a reliable company in the world of water heaters. They are the largest manufacturer of premium quality AO Smith electric tankless water heater reviews.

They stand out in terms of technology, modernization, and energy efficiency. Here’re some of their heaters’ qualities that help them outshine from their competitors.

Patented Glass Lining

They came up with a revolutionary notion of lining the inner side of their tanks with glass coating.

This unique idea was named Blue Diamond Glass technology in 2004.

This technology is 2X effective in inhibiting corrosion and rust like any other liner utilized by their competitors.

Eco-Friendly Methodology

They are committed to helping the environment. Recently, they have set up a multipurpose lab in China that has a complex water purification system.

This system recycles approximately 80 percent of the plant’s water.

It also complies with the USA’s research and development center standards and top certifications.

Moreover, their new construction line discharges zero nitrogen and phosphorus emissions.

With AO Smith signature water heater reviews condensing range, the highest levels of efficiency have been achieved.   

Are AO Smith Tankless Water Heaters Good?

Yes, there’re tons of benefits of buying their products that are as follows:

  • They make environment-friendly heaters.
  • Most of their machines are highly energy-efficient and demand fewer resources to heat water.
  • They are rust and corrosion-resistant.
  • They don’t clog up dust and sediments; therefore, they offer maximum warm water output.
  • Recently, they have launched an iCOMM application that you can use to control your heater remotely.
  • Their units use 1/4th heating system power and guarantee you procure nonstop warm water at the lowest rates.
  • Their units are very cost-effective and easier to install.

AO Smith Tankless Hot Water Heater Reviews: Buying Guide 2022

Keep these factors in mind while buying an AO Smith water heater.

Think About Electrical Fittings

AO Smith electric hot water heater reviews need electricity to run; the gas devices require 115 volts for ignition.

Electric units need 240 volts and a line devoted to handling the present draw adequately.


You should select a fuel type that is more cost-effective for you.

For instance, gas or propane machine has minimal running costs compared to electric heaters.

Nevertheless, they may not heat the water quickly.

Tankless or solar devices are also very highly energy-efficient options available.

So, choose any fuel type as per your preference and a highly energy-efficient heater.

Consider Venting Options

Gas units need to be vented outside. Furthermore, when you swap a gas appliance with a new one, you have to modify the location from the previous deployment.

Therefore, look for the best venting option. You can employ an expert plumber that can install venting rapidly and safely.

High Recovery Rate

The recovery rate is connected to how swiftly the unit can produce warm water once the initial supply has decreased.

A low recovery rate means you will have to wait for the device to warm up the water for a long time.


If you are planning to purchase a new unit, you should certainly consider a product by AO Smith.
Their items work efficiently to endure all of your warm water requirements.
Durable and sturdy, they have a reputation of lasting for at least 30 years when properly maintained and serviced.
They integrate the latest technology in their heaters, so they manage to last for decades.
With superior quality products and world-class customer service, A.O. Smith has been leading the market for more than 139 years.
We hope our AO Smith tankless water heater reviews have helped you choose a product that suits your needs.
No matter which appliance you choose, you can rest assured that you’ll save money, energy, and water.

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