A weird water heater code flashing in your face doesn’t help. AO Smith tankless fault codes might be confusing, but we’re here to help you decipher them.

Also Read: AO Smith Water Heater Reviews

However, this will necessitate people to learn more about AO Smith Tankless Water Heater Troubleshooting to understand the error and the solution. With that being said, here in this article, we’ve listed a few error codes and discussed their solution.

Is There A Way To Find AO Smith Water Heater Errors?

Tankless water heaters from AO Smith that are fitted with a remote controller have a significant benefit; they offer a self-diagnosing capability that assists in diagnosing heating problems. 

If there is a problem with the water heater, a sound will be made by the installed remote, and an error number will be shown on the screen.

These codes can be displayed on remote controls for some models, like the 240, 340, and 540 series. Similarly, an error code will also be displayed on the appliance’s LED display in place of the temperature.

However, in a model like the 510 series, a message indicating an error code will be displayed on an LCD. Others, like the 110 and 310, have a red light on the appliance that blinks rapidly. 

Also Read: Comparing Rheem vs AO Smith Water Heater

When an error occurs, the light blinks a different number of times. But it’s better to check your owner’s manual to determine what model you have and where the error code can be found.

AO Smith Tankless Water Heater Troubleshooting

Here’re the error codes you’ll see if your water heater was installed correctly in accordance with the manufacturer’s specifications.

Error Code 031, Flash One Time

What Is It?

If you’re having error code 31, that means some problem arises in the setting of the water heater’s dipswitch.

Troubleshooting

First of all, stop the power supply. After removing the front cover, you’ll find the dipswitches. Now it’s time to check the dipswitches and make sure they have been installed correctly.

Error Code 101, Flash Five Times

What Is It?

This is an alarm code that indicates abnormal combustion.

Troubleshooting

First, check if there’s any blockage in the airflow. To do so, you can check the fan, venting length obstruction, heat exchanger, etc.  And if necessary, make adjustments to the manifold pressure to achieve the desired results.

Lastly, clean the fan motor and gas burner if they’re dirty or greasy. Ensure that the inlet is free of debris, such as dust and grease. Finally, restart the system after all the installation.

Error Code 111, Flash Three Times

What Is It?

An ignition failure means that the unit will not turn on after three failed attempts to start it.

Troubleshooting

Verify that the hi-limit switch is functioning properly and that no wires or connections are loose. Make sure to call for help if it’s tripping and you don’t know why it’s doing so.

Then check the flame rod if there’s any coal dust or not. Lastly, examine the computer board to ensure that it isn’t damaged and no loose wires or connections.

Error Code 121, Flash Three Times

What Is It?

During operating, there’s a reduction in the amount of flame.

Troubleshooting

First, check the hi-limit switch and computer board. Then check to see that there’s no obstruction in the gas supply and the gas is turned on at the proper pressure. However, vents may be obstructed, so look for them.

Error Code 311, Flash Two Times

What Is It?

This is an output thermistor (heater’s component that produces a modest electric current) error.

Troubleshooting

Inspect wire connections to ensure that they’re secure and free of burns or cuts. The output thermistor is located on the right side of the heat exchanger, near the bottom. Check the resistance value; it should be around 74°F at room temperature.

Error Code 321, Flash Two Times

What Is It?

This error is shown when a failure is found on the outlet thermistor.

Troubleshooting

There should be no damage to the thermistor wiring connection. That’s why clean the thermistor if it has become clogged with dirt or debris, if necessary. Still, if the code error continues to occur, the outlet thermistor should be replaced.

Error Code 331, Flash Two Times

What Is It?

An error occurred in mixing the thermistor.

Troubleshooting

The thermistor wiring connection should be undamaged. That’s why it’s important to clean the thermistor if it gets clogged with dirt or debris. Even so, if the code error persists, it’s time to get a new outlet thermistor.

Error Code 341, Flash Two Times

What Is It?

This is the alert of the failure of the exhaust thermistor.

Troubleshooting

Check the thermistor and clean it thoroughly.

Error Code 391, Flash Two Times

What Is It?

This is the air-fuel ratio (AFR) failure.

Troubleshooting

To be safe, make sure the wire connections are tight and no cuts or burns on them. Check if the clear plastic tube that connects the proportional gas valve to the combustion chamber has been properly installed. Lastly, clean up the AFR if needed.

Error Code 441, Flash Two Times

What Is It?

This code means that the flow sensor isn’t working properly. As a result of the master unit signalling another heater to begin operation, the latter fails.

Troubleshooting

Find out if there’s a water supply to the heater that’s out of order. To prevent damage to the computer board, check for frayed or broken wires. The inlet filter should be free of debris. Lastly, make sure the flow sensor is clean.

Error Code 510, Flash Six Times

What Is It?

A problem arises in gas valves.

Troubleshooting

Shut off gas and power to the unit immediately if the hot water is turned off, but flames are still visible through its sight glass. Inspect all the wires connecting the gas valve assembly for burns or cuts.

Ensure that each gas valve wire is connected to the correct location if the device has recently been repaired. After all, these make sure the supply gas pressure is within the specified range.

Error Code 611, Flash Four Times

What Is It?

The code indicates the abnormality found in the fan motor.

Troubleshooting

Examine the fan motor wiring for damage and the PC board for moisture. Before turning the power back on, if there’s any moisture, allow it to dry thoroughly. If the problem still persists, a new computer board may be required.

Error Code 651, Flash Four Times

What Is It?

There’s a problem with the flow control valve.

Troubleshooting

Turn off the electricity first. Wire connections must be safe and free of burns. The cold water inlet is connected to the flow adjustment valve, hidden behind the computer board. Check the valve for water leakage and clean the flow adjustment valve if any dirt or debris is found.

Error Code 661, Flash Four Times

What Is It?

Damage found in bypass valve.

Troubleshooting

First, you have to check the flow adjustment valve for any damage. And then check if there’s any build-up on the motor drive. However, don’t forget to check for any water leakage.

Error Code 701, Flash One Time

What Is It?

The motherboard of the computer is malfunctioning.

Troubleshooting

You should ensure that all of the cables are connected correctly and that there’re no fractures in them. Take a good look at the board for any signs of a burn or cut. Check to verify that the machine has a working power supply.

Error Code 711, Flash One Time

What Is It?

The gas solenoid valve driving circuit has failed.

Troubleshooting

Wire damage should be looked for in the hi-limit and overheat cut-off switches. Don’t forget to check the gas valve’s control board connection.

Error Code 721, Flash One Time

What Is It?

The error shows the false flame detection.

Troubleshooting

All gas and electricity must be cut off first. The flame sensor may be the source of the issue. To get further help, contact the Technical Service Department.

Error Code 741 and 751

What Is It?

The water heater and the remote controller aren’t communicating properly. You may experience these errors if you unplug the heater’s remote from the power source while the heater is running.

Troubleshooting

Before unplugging the remote, turn the power off. You should verify that the remote and the water heater are properly connected. Get the right remote control before starting.

Signs of damage, such as burned wires or a faulty control board, should be looked for. LCD screens may flash if the power is off for a brief period.

Error Code 761

What Is It?

In an Easy-Link system, there is a communication breakdown between master and slave units. This error message indicates that the master unit has lost contact with the heater it is referring to. 

Troubleshooting

Verify that the item that has lost communication is receiving electricity. If you’re not sure how to set up communication cables, go to the Installation Manual. Do a visual inspection for indicators of voltage spikes.

Error Code 991, Flash Five Times

What Is It?

Inadequate gas combustion is what the code is showing.

Troubleshooting

If you’ve tried everything else and nothing has worked, contact the Technical Service Department. The gas pressure in the manifold may need to be adjusted. Restart the computer if you’re certain that the issue has been resolved.

FAQs on water heater troubleshooting

• Why does a tankless water heater beep?

If there’s a problem with your tankless water heater, it’ll “beep” and show an error code. In the event of a breakdown, malfunction, or leak, tankless water heaters will emit an audible alarm.

• Should I switch off my tankless water heater if the water is off?

As tankless and point-of-use water heaters don’t operate heating elements constantly or store water in a tank, they don’t need a water shutdown.

• How can I alter the AO Smith tankless water heater’s temperature?

Both thermostats should be set at 120 degrees Fahrenheit. Turn the water temperature dial clockwise (>>) to raise the temperature if necessary. To lower the temperature, turn the dial counterclockwise ().) Both thermostats should be set to the same temperature.

• How often should tankless water heaters be flushed?

Every year, tankless water heaters must be cleansed to ensure proper operation. Residents with hard water should flush and clean their water treatment systems more often, potentially every six to nine months.

Final Thoughts on AO Smith Water Heater Troubleshooting

Now that you’ve learned a bit more about AO Smith Tankless Water Heater Troubleshooting, you’ll be able to start repairing any issues on your own. 

Just keep in mind that if you’re unsure about anything, you should contact a service specialist. When it comes to gas and electricity, safety is of the utmost importance.

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Related Resource:

Rinnai Tankless Water Heater Troubleshooting

How to Test Water Heater Thermostat

To be fair, it’s almost a neck to neck fight between the Rheem water heaters and the AO Smith water heaters. But, at the same time, it’s a difficult choice to pick out amongst them.

The ideal brand for your pick should depend on the type of model you choose and the individual requirements that you have. So let’s dally any further and goof off to the comparison – Rheem VS AO Smith Water Heater.

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AO Smith – A Brief Review

AO Smith is one of the leaders in the water heater industry to supply commercial and residential products. Most of the people know the brand value of AO Smith as a reliable tank-based water heater. But there are also tankless heaters available that come with high-efficiency.

Overall, AO Smith is a reliable brand for most of the consumers. Not only is it because of the price, but also the performance that the water heaters put up. Founded in 1921 by Olivier Smith, this company has grown to be one of the biggest in the world.

AO Smith EJC-6 Residential Electric Water Heater

• Compact design
• Side-Mounted Plumbing and Electrical Connections
• Designed for Installation UnderSide-Mounted Plumbing and Electrical Connectionsa Counter
• Durable Tamper-Resistant Brass Drain Valve
• No. of Elements: 1

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Rheem – A Brief Review

Rheem is one brand that everybody wants to have in their home because of the remarkable manufacturing of the products. The best part of having a Rheem water heater in your home means that it is quickly adaptive to a solar system.

The manufacturing unit was formed by brothers Richard and Donald Rheem and from there on, it’s a no looking back. The reason behind the growth of Rheem is mainly because the manufacturing was based on improving the quality over the profit. As a result, it has become one of the biggest brands with water heaters available all over the world.

Rheem 18kW 240V Tankless Electric Water Heater, Gray

• External digital thermostatic control with LED display (+/1 degree accuracy)
• Most advanced self-modulation, adjust power to meet hot water demand
• Durable Copper immersion two heating elements, field Serviceable. Flow Rate- up to 4.4 GPM
• Simple installation – bottom 3/4 inch NPT water connections
• Threaded for easy replacement, simple installation, digital temperature display

$445.00

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Rheem VS AO Smith Water Heater

The best way to know a product is by comparing them with the same specs. Only when you can identify the differences in the specification of the same product from different brands, then you can make the best choice.

Here, we’ve compared the products depending on features and specifications to give you a better idea of the Rheem vs AO Smith water heater.

1. Gas and Fuel

Gas heaters available in the market are best known for the service. Since they consume low fuel, they are generally much efficient to use as well.

The gas heaters for AO Smith are widely famous because of the functions and the performance they provide. The AO smith has always focused on accomplishing the LEED ratings to make their heaters with a higher level of efficiency. But this brand makes sure that every gas-based model must come with low emission of NOx.

At the same time, Rheem comes with multiple lines of products when it comes to the gas-based heaters. Infact, most of the products are quite different in terms of levels and series. Rheem Gas Water heaters come with pleasant performance and are decent for the environment.

Rheem 18kW 240V Tankless Electric Water Heater, Gray

• External digital thermostatic control with LED display (+/1 degree accuracy)
• Most advanced self-modulation, adjust power to meet hot water demand
• Durable Copper immersion two heating elements, field Serviceable. Flow Rate- up to 4.4 GPM
• Simple installation – bottom 3/4 inch NPT water connections
• Threaded for easy replacement, simple installation, digital temperature display

$445.00

Buy on Amazon

2. Electric Heaters

The electric heaters are superfast in performance and are a great buy for the people who rely on the performance rather than efficiency.

The Rheem electric water heaters are quite significant in performance and come with great compatibility. But the best part of choosing a Rheem electric heater is because of the quick start up it has. It requires much less time and effort to perform.

To be fair, it is an entirely DIY process that can be efficient to install. Moreover, every electric water heater from Rheem comes with double copper features that make it reliable.

AO Smith, on the other hand, has multiple levels of products when it comes to interior quality and performance. Each of the products covers the basic standards and this is the reason why they are quite safe to use for both home and commercial use. But, the brand offers the range of products on 3 tires evaluating their performance.

Rheem 18kW 240V Tankless Electric Water Heater, Gray

• External digital thermostatic control with LED display (+/1 degree accuracy)
• Most advanced self-modulation, adjust power to meet hot water demand
• Durable Copper immersion two heating elements, field Serviceable. Flow Rate- up to 4.4 GPM
• Simple installation – bottom 3/4 inch NPT water connections
• Threaded for easy replacement, simple installation, digital temperature display

$445.00

Buy on Amazon

3. Tankless Water Heaters

Nowadays, there are almost 8 tankless water heaters in every 10 homes present. They are specifically manufactured to reduce the wait time and provide low NOx. To be fair, it’s one of the most advanced technologies used for a water heater.

The AO Smith models come with toxic-free ingredients that make their products safe to use. All of their products come with a digital display that can read out the accurate data and the information very quickly.

One the other hand, Rheem is one such brand that anyone will like to have for the highest efficiency. The tankless heaters from this brand come with a long lifespan. As a result of this, the heaters are much more stable even under extreme weather conditions.

The best part is that they have a massive range of UEF ratings.

Rheem 18kW 240V Tankless Electric Water Heater, Gray

• External digital thermostatic control with LED display (+/1 degree accuracy)
• Most advanced self-modulation, adjust power to meet hot water demand
• Durable Copper immersion two heating elements, field Serviceable. Flow Rate- up to 4.4 GPM
• Simple installation – bottom 3/4 inch NPT water connections
• Threaded for easy replacement, simple installation, digital temperature display

$445.00

Buy on Amazon

4. Spare Parts

The spare parts and the interior elements within the AO Smith heaters are completely changeable. Because of this, it becomes much easier to remove the heating element or the multiple parts that are available within the heater. This implies both the tank and the tankless water heaters.

In the case of Rheem, the spare parts for a gas water heater are changeable. At the same time, there are more fixed parts in the tankless heaters. So at times, you may have to ask for a professional to replace the parts of the tankless heater.

Rheem 18kW 240V Tankless Electric Water Heater, Gray

• External digital thermostatic control with LED display (+/1 degree accuracy)
• Most advanced self-modulation, adjust power to meet hot water demand
• Durable Copper immersion two heating elements, field Serviceable. Flow Rate- up to 4.4 GPM
• Simple installation – bottom 3/4 inch NPT water connections
• Threaded for easy replacement, simple installation, digital temperature display

$445.00

Buy on Amazon

5. Manual Guide

There’s nothing much in the manual guide provided with the AO Smith heater. The information provided is very crisp and contains just data about the parts. However, for the Rheem heaters, the guide book covers everything.

You can get detailed information about the parts and the valves. So when you need to replace these parts, it becomes easier for a Rheem water heater.

Rheem 18kW 240V Tankless Electric Water Heater, Gray

• External digital thermostatic control with LED display (+/1 degree accuracy)
• Most advanced self-modulation, adjust power to meet hot water demand
• Durable Copper immersion two heating elements, field Serviceable. Flow Rate- up to 4.4 GPM
• Simple installation – bottom 3/4 inch NPT water connections
• Threaded for easy replacement, simple installation, digital temperature display

$445.00

Buy on Amazon

6. Pricing

You already know tank water heaters are less costly than tankless water heaters. It is so because of the implementation of the newest technology in the tankless water heater.

If you talk about Rheem vs AO Smith water heaters from a price point of view, you would see AO Smith water heaters are comparatively cheaper yet contain excellent quality.

AO Smith tank top water heaters are more reasonably priced than their tankless water heaters. You’ll find Rheem tankless water heaters with nearly the same specifications a bit pricier.

Conclusion

After a series of differences between the two brands, it would be ideal to say that they are quite similar to each other. However, if you just go in for an in-depth review, Rheem slides past AO Smith because of minute differences. So my vote will go for the Rheem tankless and electric systems.

But if you’re looking for a gas-based model, you can even put your hands on the AO Smith Gas water heater and enjoy your time. So, this was our take on Rheem VS AO Smith Water Heaters.

Do let us know what your favorite pick is down below in the comments section. Also, mention to us which product are you using and whether you are satisfied with it or not.

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One company that has been leading the water heater market since years is A.O. Smith. Known for delivering high-grade products engineered using best technologies and catering to the requirements of modern consumers, the water heaters by A.O. Smith always outperform their competitors.

A.O. Smith offers a comprehensive range of water heaters including electric, tankless, gas, and solar. So, no matter what your personal preference is, you will always find a water heater with ease.

In this post, we have listed AO Smith Water Heater Reviews for A.O. Smith’s top water heater models along with all important details that you want to know about this company and its product range.

The A.O. Smith water heaters excel others in the market because of various factors. The prominent reasons to why you must choose A.O. Smith hot water heaters are:

• The company engineers its water heaters using industrial-grade components and top-quality materials.
• All water heaters use glass-lined technology. The company is the first one to patent this technology in 2004 and has named as a Blue Diamond glass coating. Because of this technology, the A.O. Smith water heaters hold twice resistance to corrosion and rust than traditional heating liners.
• Most of its water heaters are Energy Star-rated meaning they consume less energy, and hence, can help you reduce the heating bills to a great extent. If you want a product with excellent performance and high energy-efficiency, these water heaters can serve you in the best manner.
• The recently manufactured water heaters by A.O. Smith are equipped with the latest technology such as iCOMM app. It is an explicitly designed app for commercial water heaters, allowing the users to monitor their units remotely. It has served as an excellent solution to property managers.
• A.O. Smith proudly states that their propane and gas-powered water heaters are rated ultra-low or low NOx. It means that they emit very minimal amount of nitrous oxide, which helps in combating the greenhouse effect.

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

• Blue Diamond glass coating provides superior corrosion resistance to industry-standard glass lining
• Self-powered electronic gas valve uses thermopile to generate power needed to operate the electronic gas control without requiring external power
• Internal microprocessor provides enhanced operating parameters and tighter differentials for precise sensing and faster heating response
• Dynaclean diffuser dip tube helps reduce lime and sediment buildup, maximizes hot water output; made from long-lasting PEX cross-linked polymer
• Meets all current regulations set forth by the National Appliance Energy Conservation Act (NAECA)

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A.O. Smith offers a wide range of water heaters.

1. Gas Water Heaters

A.O. Smith offers gas and propane heaters in a wide range. Their heaters are categorized into three Proline tiers.

Why they stand out?

The gas and propane water heaters by A.O. Smith are known for their unmatched efficiency and high-grade quality. All their gas water heaters are marked with LEED ratings and are energy start certified. All models in this range are proven to deliver ultra-low or low NOx emissions and come with 4 distinct options.

Different Lines of A.O. Smith Gas Water Heaters

• Polaris

The Polaris gas water heaters by A.O. Smith are ideal for those who want uninterrupted supply of hot water. This range comes with high energy efficiency with great recovery rate and ultra- low noise operation.

• ProLine Master and ProLine

The water heaters featured in this range are designed for permanent and mobile use within residents. They come with high recovery and 80% energy efficiency ratings.

Some of the models deliver even higher efficiency rating than this. All models in this range are certified for exceptional performance and are categorized under an exclusive category, the ProLine XE.

• Signature

This line of A.O. Smith water heater consists of numerous Signature Premier and Signature Select water heaters designed exclusively for residential use. Though they do not hold the highest energy efficiency, but offer the best value for money.

• Vertex

The entire line of Vertex gas water heater is an Energy Star product featuring high thermal efficiency and exceptional recovery rates.

2. Electric Water Heaters

The electric water heaters by A.O. Smith are powered electrically. The best thing about these heaters is that they are engineered using environment-friendly components and comes with LEED certification. They draw a specific power from the electrical outlet and require smaller space for installation.

Why they stand out?

In comparison to other models, the electric water heaters deliver higher efficiency. They offer small point-of-use and can fit well into compact spaces.

Different Lines of A.O. Smith Electric Water Heaters

• ProLine and ProLine Master

This is the lowest Tier of electric water heater, which is almost the same as the ProLine range of gas water heaters. The models in this range deliver above-average efficiency. They are available in various sizes with the smallest tanks holding capability to hold a few gallons of water.

• ProLine XE

The water heaters in this range feature ultra-high efficiency and digital display. They come in mid-size tanks and are ideal for single-family or apartments.

• Signature

The water heater models in the Signature series is sold at Lowes as of 2017. These water heaters are great for those who want great durability and high-efficiency from their product.

• Voltex

These water heaters are quite similar to the Vertex line of gas water heaters. They are compliant with energy start and come in an appealing hybrid design. The unique hybrid design doubles the dehumidifier, extracting excess moisture from the air to reduce utility bills and water requirements.

3. Tankless Water Heaters

A.O. Smith offers a wide range of tankless water heaters, which are available for propane and gas usage. These models feature ultra-low or low NOx thereby leading to enhanced environmental safety.

Why they stand out?

Tankless water heaters are in high demand as they need very less space for installation. They offer hot water supply on-demand and come with remote control operation and digital displays.

Different Lines of A.O. Smith Tankless Water Heaters

• Propane and Gas

Most of the models in this line feature non-hybrid technology and come with LEED and Energy-star certifications. They are rated as ultra-low NOx and are greatly efficient.

• Propane / Hybrid

These water heaters are fueled by propane or gas. These are efficient models with an extensive range of domestic systems. They offer high levels of efficiency and are non-condensing.

4. Solar Water Heaters

The solar water heaters by A.O. Smith are available under the line Cirrex Solar system. These water heaters are highly efficient and excellent for the environment.

Why they stand out?

 These water heaters come with OG-300 certification ensuring they are eligible federal rebates and breaks in various states. Moreover, they reduce heating expenses by 70%, and hence, are perfect for those who have a tight budget.

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

• Blue Diamond glass coating provides superior corrosion resistance to industry-standard glass lining
• Self-powered electronic gas valve uses thermopile to generate power needed to operate the electronic gas control without requiring external power
• Internal microprocessor provides enhanced operating parameters and tighter differentials for precise sensing and faster heating response
• Dynaclean diffuser dip tube helps reduce lime and sediment buildup, maximizes hot water output; made from long-lasting PEX cross-linked polymer
• Meets all current regulations set forth by the National Appliance Energy Conservation Act (NAECA)

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Buying A.O. Smith water heaters is considered a wise choice because all of its products offer multiple benefits such as:

• The company is dedicated to manufacturing eco-friendly units.
• Most of its water heaters are energy efficient and need lesser resources to heat water. Even, their manufacturing plant in China recycles 80% of water used during the development process.
• The products developed by the company are of high-quality, and hence, last longer.
• These water heaters hold high resistance to corrosion and rust.
• These models do not clog up sediments or dust, and hence, provide maximum hot water output.
• The newly introduced iCOMM app can be used to gain control over your water heater even when you are at a distance.
• Buying A.O. Smith hot water heaters can save you a lot of energy and time! These water heaters utilize 1/4th power of the heating system and make sure you gain consistent hot water supply at low prices.
• With numerous safety and advanced mechanisms introduced, these water heaters are able to serve numerous purposes at once.
• These water heaters are highly affordable and do not involve any complex installation.
• Since, these water heaters are integrated with the best-quality components and elements, so there is reduced down ProMaxtime of repair and maintenance. 
• The extensive product range of gas, tankless, electric, and solar water heaters lets you make a preferred choice.

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

• Blue Diamond glass coating provides superior corrosion resistance to industry-standard glass lining
• Self-powered electronic gas valve uses thermopile to generate power needed to operate the electronic gas control without requiring external power
• Internal microprocessor provides enhanced operating parameters and tighter differentials for precise sensing and faster heating response
• Dynaclean diffuser dip tube helps reduce lime and sediment buildup, maximizes hot water output; made from long-lasting PEX cross-linked polymer
• Meets all current regulations set forth by the National Appliance Energy Conservation Act (NAECA)

Buy on Amazon

A water heater is a long-term investment. You must therefore select a model that precisely meet your requirements and can serve you longer. Some of the important factors to take into account are:

1. Check Space Available with You

Water heaters come in different dimensions. If you want to buy a big water heater, you must have enough space for its installation.

There are a few water heaters that require proper surrounding air. You must check proper cubic square footage requirements before buying a heater.

2. Energy-Efficiency

Pick a fuel source, which is more affordable. For example, natural or propane gas water heaters involve less operational cost in comparison to electric water heaters. However, they may not offer quick heating mechanism.

Tankless or solar water heaters are other energy-efficient options available. So, pick a fuel source as per your choice and a model as per energy efficiency ratings.

3. Consider Electrical Fittings

While electric water heaters need electricity for running, the gas water heaters need standard 115-volt for ignition system. Electric tankless water heaters require 240-volt service and a line dedicated to sufficiently handle the present draw.

4. Consider Venting Options

Gas water heaters are vented outside the house. Also, when you replace gas water heater with a new one, you have to alter the place from last installation. Hence, check the best venting option. For this, you can hire a professional plumber that can perform venting quickly and safely.

5. Understanding Hybrid Water Heaters

Such water heaters gather heat from air and then use it to heat water. For this reason, they use 60% less energy than traditional water heaters. Though they are quite expensive initially, the associated energy cost can save you a lot.

But hybrid water heaters are ideal for colder places or regions with temperature range from 40 to 90 Degrees Fahrenheit. For installation such units, you want a clearance of around 7 feet to the ceiling from floor. This will accommodate your heat pump.

6. Hot Water Storage Tank

It is essential that your water heater serves your entire family. For this, you have to pick one that has an appropriate hot water storage tank capacity. A 50-gallon hot water supplies enough hot water needed for a family of 4 members. In case you wish to pick tankless water heater, take into account the family needs as well as climate.

7. First Hour Rating

It is a rating based on hot water stored in the tank compared to incoming cold water, which can be heated in one hour. A heater with higher first hour rating results in more hot water supply during peak use.

8. High Recovery Rate

This rate is related to how fast the water heater can generate hot water once the initial supply has reduced. A low rate of recovery means who have to wait longer for the heater to heat up the water.

9. Low NOx

Every water heater generates nitrogen oxide while heating the water. Water heaters with low or ultra-low NOx are the best as they are proven to release less amount of nitrogen oxide. This is a good thing for your health and the environment.

10. Flow Rate

It refers to the number of gallons of hot water in one minute. Heaters with higher flow rate are beneficial.

11. Warranty

You must select a water heater with a minimum 6-year warranty. With A.O. Smith hot water heaters, the warranty is available for up to 10 to 15 years for their parts.

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

• Blue Diamond glass coating provides superior corrosion resistance to industry-standard glass lining
• Self-powered electronic gas valve uses thermopile to generate power needed to operate the electronic gas control without requiring external power
• Internal microprocessor provides enhanced operating parameters and tighter differentials for precise sensing and faster heating response
• Dynaclean diffuser dip tube helps reduce lime and sediment buildup, maximizes hot water output; made from long-lasting PEX cross-linked polymer
• Meets all current regulations set forth by the National Appliance Energy Conservation Act (NAECA)

Buy on Amazon

It is very easy to install A.O. Smith water heater. Just make sure you always hire a professional to get the job done. In case you don’t have easy access, you can simply visit the company’s website and register your purchase and model.

A professional from the company will soon visit you and offer you with the perfect installation. Also, if you have any doubts regarding the product, you can ask the professional and gain absolute peace of mind.

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

• Blue Diamond glass coating provides superior corrosion resistance to industry-standard glass lining
• Self-powered electronic gas valve uses thermopile to generate power needed to operate the electronic gas control without requiring external power
• Internal microprocessor provides enhanced operating parameters and tighter differentials for precise sensing and faster heating response
• Dynaclean diffuser dip tube helps reduce lime and sediment buildup, maximizes hot water output; made from long-lasting PEX cross-linked polymer
• Meets all current regulations set forth by the National Appliance Energy Conservation Act (NAECA)

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All water heaters engineered by A.O. Smith are known for holding a strong market reputation in terms of durability, build, and quality of components. They usually do not show the standard problems occurring in other water heaters.

Most of their units last longer without leading to any problem for at least 10 years. By regularly maintaining your water heater and availing of professional service in time of need, you can extend the product lifespan to a great extent.

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

• Blue Diamond glass coating provides superior corrosion resistance to industry-standard glass lining
• Self-powered electronic gas valve uses thermopile to generate power needed to operate the electronic gas control without requiring external power
• Internal microprocessor provides enhanced operating parameters and tighter differentials for precise sensing and faster heating response
• Dynaclean diffuser dip tube helps reduce lime and sediment buildup, maximizes hot water output; made from long-lasting PEX cross-linked polymer
• Meets all current regulations set forth by the National Appliance Energy Conservation Act (NAECA)

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The price of buying A.O. Smith water heater can vary drastically based on the type of model you choose and the installation technique. You must always get your water heater installed by a professional to avail of proper plumbing and electrical units.

The cost of installation may also vary depending on the kind of water heater you purchase and the intricacy of venting needed. Usually, electric water heaters are cheap to install in comparison to water heaters needing tapping or venting into the gas source.

We suggest asking professional assistance while selecting the right heater for your house. Professionals can also offer you with a precise installation bid and absolute peace of mind by doing the job in the right manner.

Most importantly, take into consideration the lifetime cost associated with a water heater. A.O. Smith water heaters may involve higher upfront price but reduced utility bills and longer service life eventually makes you a winner.

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

• Blue Diamond glass coating provides superior corrosion resistance to industry-standard glass lining
• Self-powered electronic gas valve uses thermopile to generate power needed to operate the electronic gas control without requiring external power
• Internal microprocessor provides enhanced operating parameters and tighter differentials for precise sensing and faster heating response
• Dynaclean diffuser dip tube helps reduce lime and sediment buildup, maximizes hot water output; made from long-lasting PEX cross-linked polymer
• Meets all current regulations set forth by the National Appliance Energy Conservation Act (NAECA)

Buy on Amazon

Just like other manufacturers in this industry, A.O. Smith offers limited warranty on its product range, depending on the model and style. For example, a 15-year warranty is offered for the heat exchanger of a gas tankless water heater, while the warranty for similar product in an electric water heater is 5 years.

The electric and gas tank-style water heaters come with 6 to 10 years of tank coverage based on the model. It is best to check the specific warranty coverage for your preferred model on the company’s website.

A.O. Smith has earned success and reputation over the years by delivering reliable and efficient services by always keeping their customers at prime importance.

The company was founded in 1874 by Charles Jeremiah Smith as a hardware solution shop managed by a single-person. The small business expanded fast including three sons and was renowned for manufacturing high-quality metal components used in baby carriages.

Arthur Oliver Smith was the third son to join the company, who took this venture to sky-scrapping heights by developing a lightweight steel frame for vehicles. This grabbed attention of leading automobile companies like Cadillac and Ford.

This innovation by Arthur was a marvel to the industry and soon the first automated frame production line was introduced in 1921 by son of Arthur, Lloyd Raymond.

Then in 1936, A.O. Smith engineers introduced a unique method for incorporating glass linings to residential water heaters. One after the other, there were advancements in water heater design, which led to company’s expansion in China, Europe, and Canada.

The automotive branch was sold by the company in 1997 along with its electric motor branch in 20111. As a result, the company was established as a major water treatment and heater company, becoming a global pioneer.

The glorious success of the company is 150 years old, which still exists!

To make the buying process simpler for you, here we list the 10 best A.O. Smith water heaters.

 Best Gas Water Heaters

1. A.O. Smith Signature Premier 50-Gallon Short 6-Year Limited Natural Gas Water Heater

This gas water heater by A.O. Smith is an excellent product with high energy efficiency and certified star rating. It offers through the roof and wall venting. The vent pipe comes in ABS, CPVC, or PVC form with a vent diameter of 2, 3, or 4 inches.

It is equipped with self-diagnostic gas control mechanism and LED status indicator, which makes it easy to monitor the current operational status of the heater.

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

This is a premium model designed with the best-quality components and ensures gas fuel is utilized in the most efficient manner. It comes with high recovery level and is a perfect solution for bigger families with continuous demand of hot water supply.

The compact and sleek design offers easy installation at any space as it can vent up to 40 feet. The model is equipped with two-pipe combustion systems that draw clean air eliminating issues related with indoor ventilation.

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

• Blue Diamond glass coating provides superior corrosion resistance to industry-standard glass lining
• Self-powered electronic gas valve uses thermopile to generate power needed to operate the electronic gas control without requiring external power
• Internal microprocessor provides enhanced operating parameters and tighter differentials for precise sensing and faster heating response
• Dynaclean diffuser dip tube helps reduce lime and sediment buildup, maximizes hot water output; made from long-lasting PEX cross-linked polymer
• Meets all current regulations set forth by the National Appliance Energy Conservation Act (NAECA)

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3. A.O. Smith Signature 40-Gallon Short 6-Year Limited Natural Gas Water Heater

With self-diagnostic gas control mechanism and LED display indicator, this A.O. Smith gas water heater will never disappoint you in terms of efficiency and performance. It comes with advanced safety technology that alleviates risks of accidental fires or short circuits. While the push button ignition system offers quick start, the pressure relief valve and factory induced temperature serves safe operation.

Best Electric Water Heaters

1. A.O. Smith Signature Premier 50-Gallon Short 12-Year Limited 5500-Watt Double Element Electric Water Heater

This electric water heater ideally optimizes hot water output with 3-4 members. It is equipped with two 5,500 watts stainless steel heating elements and an electronic interface offering you the ease to operate this unit in three different modes.

With self-diagnostic controls, making selections is easy and quick. The unique Energy Smart Mode ensures there is no heat loss when the unit is at standby.

The water tank is shielded with fused ceramic imparting resistance to corrosion, and hence, delivering longer service life.

2. A.O. Smith PXNS-50 Conservationist Short Electric Water Heater, 50 Gallon

This line of electric water heater is an energy-efficient model that will always impress you with its superior performance and exceptional build. It comes with Phoenix heating elements on lower and upper ends, which lasts three times longer than usual copper elements.

The Blue Diamond glass coating imparts great resistance to corrosion to the entire body. It comes with unique Dynaclean II technology, which is specially designed to generate turbulence in the tank.

3. A.O. Smith Signature 50-Gallon Tall 6-Year Limited 4500-Watt Double Element Electric Water Heater

The Signature Select electric water heater is a wonderful choice that maximizes hot eater output. It is designed using environment – friendly insulation and reduces heat loss during standby. With factory-installed temperature and a pressure relief valve, it offers smooth operation.

The tamper-proof nylon drain valve prevents undesirable water discharge and offers a way to drain water from heater. The water tank is surrounded by a strong layer of non-CFC polyurethane foam that traps heat within and saves energy.

Best Tankless Water Heaters

1. A.O. Smith ATI-540H-N Condensing Residential/Light Commercial Tankless Heater

This A.O. Smith water heater is an excellent product fit for light commercial and residential use. With a high indoor capacity of 13,000 BTU, it inputs excellent power and ensures that you receive consistently hot water supply. The water heater is a tankless design that means it requires less space for storage. At the same time it frees you from worries related to tank leaks.

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AO Smith ATI-540H-N Condensing Residential/Light Commercial Tankless Heater

• Never run out of water again with a steady 10 GPM flow rate
• Electric ignition ensures you never have to mess with a pilot light again
• This product is Energy Star certified with a Uniform Energy Factor of 0.95
• Tankless design allows for wall-mount installation, leaving more space available for you to use
• Features a built-in temperature controller and factory installed power cord

$1,461.61

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2. AO Smith ATI-340H-N 8 GPM Residential/Commercial Condensing Natural Gas Indoor Tankless Water Heater with 180000 Maximum BTU Input

Using this tankless water heater by A.O. Smith will ensure you never run out of hot water. It operates at a steady pace of 8 GPM. The compact design allows convenient mounting to the wall, offering you a low-profile installation.

It is equipped with factory-grade power cord and temperature controller which are compatible with category IV or III power direct venting in 4 inches and 3 inches. It is one of the finest tankless water heaters available with commercial-grade components.

8 GPM 180,000 BTU 120 Volt Residential Indoor Natural Gas Tankless Water Heater with Ultra-Low NOx

• Never run out of water again with a steady 8 GPM flow rate
• Electric ignition ensures you never have to mess with a pilot light again
• This product is Energy Star certified with a Uniform Energy Factor of 0.95
• Tankless design allows for wall-mount installation, leaving more space available for you to use
• Features a built-in temperature controller and factory installed power cord

$1,399.99

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3. AO Smith ATI-310N Non-Condensing Residential/Light Commercial Tankless Heater

Rendering a BTU of 11,000 and a maximum GPM of 8.0, this A.O. Smith water heater is a perfect solution for light commercial and non-condensing residential requirements.

This tankless water heater is a sleek and clean design that comes with exhaust mechanism to prevent accidental hazards due to overheat. It is a unique design with built-in freeze protection and warms water at a constant temperature.

AO Smith ATI-310-N Non-Condensing Residential/Light Commercial Tankless Heater

• Built in freeze protection
• Manual reset hi limit (Set at 194-Degree F)
• Overheat cutoff fuse
• Inlet and outlet thermistors for constant temperature monitoring

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Best Solar Water Heater

10. AO Smith SUN-120 Residential Solar Water Heater

The SUN-120 Solar Booster water heater is from the line of solar water heaters by A.O. Smith. Designed exclusively for residential use and light commercial applications it utilizes solar energy for heating water.

As a result, you will never have to worry about your utility bills. It is among a few solar water heaters equipped with advanced features such as Dynaclean diffuser dip tube, sop and side connections, and PermaGlas Glass Tank Coating.

AO Smith SUN-120 Residential Solar Water Heater

• Side and top Connections for open loop systems or closed loop systems using an external heat exchanger
• Dynaclean diffuser dip tube helps reduce lime
• Long-Lasting, Low-Watt-Density Heating Element
• PermaGlas Glass Tank Coating

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

• Blue Diamond glass coating provides superior corrosion resistance to industry-standard glass lining
• Self-powered electronic gas valve uses thermopile to generate power needed to operate the electronic gas control without requiring external power
• Internal microprocessor provides enhanced operating parameters and tighter differentials for precise sensing and faster heating response
• Dynaclean diffuser dip tube helps reduce lime and sediment buildup, maximizes hot water output; made from long-lasting PEX cross-linked polymer
• Meets all current regulations set forth by the National Appliance Energy Conservation Act (NAECA)

Buy on Amazon

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

• Blue Diamond glass coating provides superior corrosion resistance to industry-standard glass lining
• Self-powered electronic gas valve uses thermopile to generate power needed to operate the electronic gas control without requiring external power
• Internal microprocessor provides enhanced operating parameters and tighter differentials for precise sensing and faster heating response
• Dynaclean diffuser dip tube helps reduce lime and sediment buildup, maximizes hot water output; made from long-lasting PEX cross-linked polymer
• Meets all current regulations set forth by the National Appliance Energy Conservation Act (NAECA)

Buy on Amazon

A.O. Smith holds a history of leading the market with its innovative technology and well-build products. Though their products are not rated high on websites like Amazon, you can always browse the company’s site to gain complete detail and professional advice.

We consider A.O. Smith as one of the leading companies for water heater as they not only offer a wide product range, but also ensure their products are of the highest quality and all of them are backed with long-term warranty and rich customer support. We hope that our detailed article on AO Smith Water Heater Reviews might have helped you in choosing the best one for yourself.