The 5 Best AO Smith Water Purifiers Reviews and Buying Guide In India

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A.O Smith Corporation is an American company which is quite popular for providing reliable water purifiers across the world. In recent years, this brand has launched its products in India as well. Because of its quality and amazing features, they have become quite popular among Indian consumers.

Water filters and purifiers from this use different water purifying technologies like RO, UV, and UF which help to remove different types of impurities (included dissolved and undissolved). The X series and Z series water purifiers from this brand are specially designed Indian kitchen interiors.

As there are several models with different features, choosing the right one can be a daunting task. In this article, we have provided a list of Best AO Smith Water Purifiers along with a detail description and “Buying Guide”. We have also provided several features that are available with AO Smith water purifiers.

5 Best AO Smith Water Purifiers

Ao Smith Water PurifiersFilter TypeCapacity (Litres)WarrantyBuy Now
AO Smith Z9 Water PurifierRO + SCMT101 yearCheck On Amazon
AO Smith Z8 Water PurifierRO + SCMT101 yearCheck On Amazon
A.O Smith X2 Water PurifierRO + UV51 yearCheck On Amazon
AO Smith X8 Water PurifierRO81 yearCheck On Amazon
A.O.Smith Z1 UV 10 Litre Wall Mountable Water PurifierRO + UV101 yearCheck On Amazon

5 Best AO Smith Water Purifiers Reviews

1. AO Smith Z9 Water Purifier

ao smith z9

AO Smith Z9 water purifier is the most common model purchased by the user. It has an elegant, attractive design, and highly-portable as it adjusts in the kitchen. The water purifier is RO + SCMT purifying technology that conveys your demand.

The water purifier has an 8-stage water purifying process that makes it trustworthy.

Stage 1: Pre-Filter

It is the basic filtration process that eliminates the large impurities in the water.

Stage 2: Sediment Filter

The sediment filter removes the small particles in the water

Stage 3: Carbon Black

The carbon soaks the minute impurities and soluble impurities, it is also known as Charcoal Filteration.

Stage 4: ART MAX (Advance Recovery Technology)

This ensures minimal wastage of water, as it recovers maximum water when passes through the purifiers.

Stage 5: Patented Side Stream RO Membrane

The side stream is a type of RO filter that increases the water recovery rate.

Stage 6: MIN-TECH (Mineralizer Technology)

This stage adds essential minerals into the water. It helps the water to taste fresh, natural, and maintains a balanced PH that is an essential requirement for pure drinking water.

Stage 7: ZX Double Protection Dual Filter

The water passes through the first filter that is Silver Activated Post Carbon Filter (SAPC)

Stage 8: Second layer SAPC + SCMT

After the SAPC, the water filters through Silver Charged Membrane Technology that eradicates the secondary microbial growth or contamination in the water

Finally, after 8 stage process, the water is safe for drinking.

When you buy a water purifier, you worry about its installation. AO Smith offers you free installation, and the portable water purifiers are easy to install in any corner of the kitchen, office, or room.

The time you decide to buy a water purifier, you must check the TDS rate of your area. This product is versatile as it offers water purification up to 2000 ppm that makes it great at its price,

Sometimes, you wake up in the night to have a glass of water. And, if the lights are off, you cannot locate from were to out take the water. In this model, it has a night assist that helps you to locate your purifier in the dark.

You can get purified water by the press of a button.

During winter times, or when you are having a sore throat, it becomes lazy for you to boil water on the gas stove. But with the AO smith water purifier, you do not have to do it, just press a button, and you will have warm water from 45 °C to 90 °C at your convenience.

The purifier gives an advance alert that lets you know if the RO membrane or other filters need changing.


  • High-Storage capacity
  • Easy to use
  • Adds minerals
  • 8 stage water purifying
  • Both cold and hot water option
  • Less water wastage
  • Low power consumption
  • One-year warranty


  • The hot water only comes when the water tank is full
  • No manual option to dispense water

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2. AO Smith Z8 Water Purifier

ao z8

The AO smith water purifier has a beautiful body design that makes it look elegant. Most of the green series of AO Smith water purifiers have common functionalities.

The company provides you the free installation services you have to call on the customer service number.

This water purifier has 8 stages of water purification

Stage 1: Pre-Filter

Stage 2: Sediment Filter

Stage 3: Carbon Block

Stage 4: ART (Advance Recovery Technology)

Stage 5: Patented Side Stream RO Membrane

Stage 6: MIN-TECH (Mineralizer Technology)

Stage 7: ZX Double Protection Dual Filter

Stage 8: SAPC (Silver Activated Post Carbon Block) + SCMT (Silver Charged Membrane Technology)

The water passes through the RO membrane, and double purification confirms it for drinking purposes.

The 8-stage purification makes it safe for babies. Sometimes, when your baby is crying, then you have to give warm water to them, and the water purifier instantly gives you water.

You can set the temperature to 45 °C for drinking and 80 °C for cooking.

The Min-Tech adds essential minerals into the water that are Magnesium, and Calcium minerals.

The green series RO water purifiers, which ensure 100 percent RO purified water that saves 2X water compare to RO water purifier.

In the night time, you can locate your water purifier because the light illuminates that shows the water filling area. Also, it makes your kitchen look better.

The advance alert helps to provide an alarm that tells that the RO membrane or other filters need changing.


  • Easy to Use
  • Easy to install
  • High-Storage Capacity
  • 8 stage water purification
  • Warm water
  • Take water even if the electricity goes
  • Value for money
  • One-year warranty


  • Few drops of water come while lifting faucet upwards and downwards.

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3. A.O Smith X2 Water Purifier

ao smith x2

The type of water purifier depends on the type of impurity and its TDS number. More the TDS, more water purification. The water purifier is small for a nuclear family or office.

If you have fewer TDS at your place, then this is the best choice to make. The TDS up to 200 ppm is fine and hardness up to 120 ppm for water purifier. The tank has 5 liters of storage, and the material is grade ABS.

The water purifier is five-stage water purification those stages are:

Stage 1: Sediment Filter

Stage 2: Fine Sediment

Stage 3: Carbon Block

Stage 4: UV Lamp

Stage 5: UF (Ultra Fine)

Stage 4 and stage 5: ensure double protection.

Water usage and other commands displays in digital format. The digital display is a simple yet intelligent technology.

The design is elegant as it has a two-color design that makes it look crafted and beautiful.

The UV Life Alert helps you to know when is the time to change the water purifier.


  • Easy to install
  • Storage Capacity
  • 5 stage process
  • Easy to use
  • Adds mineral
  • Value for money
  • One-year warranty


  • It requires an Extra installation of a water booster.

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4. AO Smith X8 Water Purifier

smith x8

This water purifier is an 8-liter capacity that is perfect for medium-sized families. If you want to buy a water purifier, check the TDS of your area. The AO smith X8 handles TDS up to 2000ppm.

For installation purposes, you have to give a call to their customer care, and a person will come for your help. You can wall-mount the water purifier as it is easy to adjust in the kitchen area. There are tubes and connectors along with it.

It has advanced water purification technology with 8 stage purification that is as follows:

Stage 1: Pre-Filter

Stage 2: Sediment filter

Stage 3: Carbon Block

Stage 4: ART (Advance Recovery Technology)

This function saves your 9000 liters water every year because it has true water recovery up to more than 55 % while ensuring 100 % water purification.

Stage 5: Patented Side Stream RO Membrane

This function is suitable for water with low and high TDS, which wastes less water and enhances water recovery.

Stage 6: MIN-TECH (Mineraliser Technology)

It adds minerals like calcium and magnesium into the water. Then, give a better taste, which is natural and has a balanced pH.

Stage 7: ZX Double Protection Dual Filter

The dual water purification removes all the water microbes that are harmful to health. When water flows through this process, it makes your water healthy to drink.

Stage 8: Silver Activated Post Carbon Black + Silver Charged Membrane Technology

The water passes through the RO membrane and provides you the double purifying.

The Advance Alert system gives you an alarm when your water purifier has to change its filter. The digital screen that makes it easy to read with an intelligent display of information.


  • Easy to use
  • Enhances through minerals
  • Value for money
  • High-Storage capacity
  • Easy to install
  • 8 stage process
  • Water recovery
  • One-year warranty


  • Sometimes battery error occurs.

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5. A.O.Smith Z1 UV 10 Litre Water Purifier

A.O.Smith Z1 UV 10 Litre Water Purifier

If you stay in an area which has a water supply with lower TDS count, this Z1 water purifier is ideal for you. It can effectively purify the water with even 200 ppm TDS levels and also the municipal water of the local markets, thanks to its powerful UV technology.

This purifier has a 10-litre tank to continuously provide purified water for a family of four. With such a large volume tank, you can also use the water for cooking, washing vegetables, and collecting hot water for your baby anytime you need.

To ensure you get the most purified water, this appliance goes through 4 stages of purification.

Stage 1: Pre-filter

It is a basic filter that readily eliminates large particles from the water.

Stage 2: Sediment filter

Here, the water will be from small particles like sand, silt, dust and other solid particles.

Stage 3: Silver Activated Post Carbon

The post carbon filter removes any unpleasant smell from the water and also enhances the taste. Meanwhile, the silver coating in this filter prevents the growth of bacteria thereby keeping the water fresh always.

Stage 4: UV Lamp

This purifier has a 11W UV lamp that removes any disinfectants and chemicals from the water, mainly from the water with low TDS levels. So, you get healthy drinking water all the time.

Coming to the features, the purifier has a temperature indicator along with a red icon to the side, to indicate the availability of hot water.

Whenever you need hot water, you just have to press the black button for 8 seconds and you can witness the temperature indicator displaying the change in the water temperature.

Also, there are indications for a tank full, so you can fill up all your water bottles at once. There’s also an auto-flush indication which indicates that the UV lamp is ON and the purification is in progress.

This water purifier measures 36.9 x 32.6 x 48.2 cm and weighs just 11 kgs, so it is compact enough to install it right above your sink or in any corner wall of your kitchen.


  • Food-grade ABS tank material for additional safety.
  • Consumes just 36 watts of power.
  • Indicates when the membrane or the filters need to be changed.
  • Has a child lock button for safety.
  • You get hot water with a temperature range of 45 to 80-degrees.
  • 1-year warranty.


  • Takes time for the water to reach from 45 to 80-degrees.

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Water Purification Techniques

A.O Smith water purifiers use different types of water purification techniques that include 5-stage, 6-stage, 7-stage, and 8-stage. We have provided a detailed information on them below.

1. 5-Stage Purification System

In this purification system, water will pass through different purification stages and filters to provide pure water which will be collected in an in-built storage tank.

Pre-filter + Sediment Filter + Silver Activated Post Carbon + UV Lamp + UF*

Stage 1 – Sediment Filter

In this purification stage, water will pass through sediment filter where physical impurities like soil particles, dirt and turbidity will be removed. Having a sediment filter will decrease the burden on fine sediment filter (next stage) and improve its lifespan as well.

Stage 2 – Fine Sediment Filter

This filter will remove finer physical impurities when water passes through it. This will improve the lifespan of the carbon block filter.

Stage 3 – Activated Carbon Filter

This carbon block contains high absorption capacity. So, it is responsible for removing volatile organic compounds, pesticides, residual chlorine and others. It will also remove bas odor and taste causing organic compounds.

Stage 4 – UV Lamp

Now the water will pass through UV lamp where UV rays kill microorganisms like bacteria and virus that are responsible for water-borne diseases.

Stage 5 – UF (Ultra Fine) Filter

This is the final stage of the purification system where water will pass through fine filter. It removes the dead bodies of bacteria, cysts, virus and microbial cells that are killed in UV filtration process.

2. 6 Stage Purification System

In this process, water will pass through 6 different stages of purification. Finally, the output pure water will be stored in a separate tank, ready for consumption. Below, we have explained this purification process in detail.

Pre-Sediment Filter + Carbon block + Sediment Filter + RO Membrane + SCM-Tech (Silver Activated Post Carbon + MIN-TECH).

Stage 1 – Pre-Sediment Filter

In this filtration process, physical impurities like soil particles, turbidity, dust, and dirt are removed. Having this process will reduce the burden on next filter and increase its lifespan as well.

Stage 2 – Carbon Block

Carbon block has high absorption capacity which will remove harmful chemicals like residual chlorine, pesticides, and volatile organic compounds present in the water. It will also absorb odor and bad taste causing organic compounds.

Stage 3 – Sediment Filter

This filter is responsible for removing fine physical impurities. Thus, it will improve the life and efficient of RO membrane (next filtering stage).

Stage 4 – RO (Reverse Osmosis) Filter

RO filter contains semi-permeable membrane. Water will pass through this membrane where TDS (total dissolved salts) will be removed. It will also remove heavy metals like lead, cadmium, mercury and others. Even microorganisms like cysts, virus, bacteria and protozoa are removed in this stage.

Stage 5 and Stage – SCM-TECH (Silver Activated Post Carbon and MIN-TECH)

In this purification stage, a combination of two filters – silver activated post carbon and mineralizer technology is used. The activates post carbon will act as polisher and improves the water taste. MIN-TECH contains magnesium and calcium minerals which will also improve water quality and taste. It will also add necessary amounts of minerals and deliver water with balanced pH levels.

3. 7-Stage Water Purification

As the name implies, water will pass through 7 stages of purification. Water will pass through RO membrane without any diversions. In the final stage, required amounts of nutrients are also added to water to make it healthier. Below we have provided detail explanation of these 7 stages.

Pre-filter + SCB (sediment + Carbon) filter + Advanced Recovery Technology + Patented Side Stream RO Membrane + Silver Activated Post Carbon and MIN TECH filter

Stage 1 – Pre-filter

In this filter, filer impurities like dust, dirt, turbidity and soil particles are removed. This process will decrease the burden of second filter and improve its lifespan as well.

Stage 2 and Stage 3 – Sediment and Carbon Block Filter

This is a dual filtration stage where water will first pass through sediment filter. Here coarse and fine physical contaminants are removed. After that, water will pass through carbon block where harmful chemicals like volatile organic compounds and pesticides are removed. Along with that, odor and bad taste are also removed.

Stage 4 – Advanced Recovery Technology (ARTTM)

In this process, water is conditioned for removing its scaling potential. It recovers more than 55% of true water which further ensures 100% RO purification.

Stage 5 – RO (Reverse Osmosis) Filter

RO filter comes with a semi-permeable membrane. Water will pass through this membrane where TDS and heavy metals like chlorine, mercury and arsenic are removed. Microorganisms like cysts, protozoa and bacteria are also removed.

Stage 6 and Stage 7 – SCM-TECH (Silver Activated Post Carbon and MIN-TECH)

This this stage, dual purification occurs. First water will pass through Silver Activated Post Carbon where it will be polished and taste enhanced. Next it will pass through MIN-TECH which contains minerals like magnesium and calcium. It will improve water quality and taste as well. It will also add necessary amounts of essential minerals to water and balanced water pH levels as well.

4. 8 Stage Purification System

Some of the A.O Smith water purifiers come with 8 stages of purification. As the water passes through 8 different filter, the output water will be 100% pure and safe for consumption.

Pre-Filter + Sediment Filter + Activated Carbon + Advanced Recovery Technology + Patented Side Stream RO Membrane + Mineralizer Technology + ZX Double Protection Dual Filter*

Stage 1 – Pre-Filter

This filter removes physical impurities like soil particles, dust, hair, dirt, stones and turbidity in the water. This will reduce the burden on the next filter.

Stage 2 – Sediment Filter

In this purification stage, coarse and fine contaminants will be removed from the water. It will improve the lifespan and efficiency of carbon block filter.

Stage 3 – Carbon Block

It contains high absorption capacity which will reduce harmful substances and chemicals like organic compounds, residual chlorine and pesticides. It will also remove bad odor and taste that are caused by organic and volatile compounds.

Stage 4 – Advanced Recovery Technology (ART)

Here the water will conditioned to decrease its scaling potential.

Stage 5 – RO (Reverse Osmosis) Filter

RO membrane contains semi-permeable filter. When water passes through it, TDS and heavy metals are removed. Along with that, microorganisms like virus, bacterial, cysts and protozoa are removed.

Stage 6 – Mineralizer Technology

In this stage, minerals like magnesium and calcium are added to water for improving the quality and taste. It also balances the pH of water as well.

Stage 7 and Stage 8 – ZX Double Protection Dual Filter

This is a dual filter stage where water will pass through Silver Activated Post Carbon Block. This will also act as water polisher to enhance the taste. Finally, it will pass through Silver Charged Membrane Technology Filter where water will be purified again to make it safer as well as healthy for consumption.

Other Features Present in A.O Smith Water Purifier

1. Storage Capacity

Water purifiers from A.O Smith come with different storage capacity tanks that include 5, 7.5, 9 and 10 liters. Based on your consumption requirement or family size, you have to choose the capacity. For bachelors, 5 liters will be enough. For small families, 7.5 liter is suitable. For medium to large families, 9 to 10 liters is suitable.

2. Hot Water Option

A.O Smith is the only brand that provides purified water at different temperature options – 45°C and 80°C. Hot water from it can be used for making tea, soothing sore throat, soaking cereals, and preparing baby food.

3. Digital Display

An LED digital display is provided which provide useful information on power, tank capacity, filter change alerts, auto flush and others.

4. UV Life Alert

This alert will let you know when the UV lamp is not working or needs replacement.

5. Advance Alert Technology

A.O Smith water purifiers come with different filters that will need replacement. Remembering their service time and replacement time is difficult. Advance alert technology will provide notifications when any of these filters need replacement. Some of the filters that require replacement include sediment, RO membrane, pre carbon and others.

6. Night Assist

This is the only brand in Indian that provides water purifiers with night assist feature. This feature will provide glowing effect which will help you reach the water purifier easily in the dark.

7. Gooseneck Faucet

Some water purifiers of AO Smith brand come with a stylish swivel faucet which provides convenient water output.

8. Certified RO Membrane

RO membrane present in A.O Smith purifiers is tested for quality standards by WQA.

Frequently Asked Questions

1.How does the Reverse Osmosis work?

The Reverse Osmosis comes with a semi-permeable membrane that allows only pure water to pass. The membrane eliminates the contaminants that are too large to pass through the small pores. Thus, the purification process removes larger and harmful particles.

2.How to conserve the rejected water?

RO water purifier eliminates 80 % impure water that drains out. While many water purifiers save more than 50 % of water as purified. You can also keep the rejected water stored separately in a bucket and later use it for car washing or watering to the plants.

3.How much is the maintenance cost of RO water purifiers?

The maintenance of any machine is necessary for efficient working. When your RO filter, you can use it for a year or so without changing the filter if your area water has low TDS. But if the water TDS is high, then you have to keep water filter changing in 6 months duration.

4.Does the RO water purifier enhance the taste?

During the RO filtration, it removes the essential minerals from water and makes it taste bland. Most of the company has a water purifier with MIN-TECH that adds essential minerals and makes the water taste better.

Few Words to Conclude…

A.O Smith water purifiers are quite popular for their quality and unique feature. We have mentioned them in detail for your reference. A buying guide is also provided to help you with choosing the right water purifier model to suit your requirements.

Some of the best A.O Smith water purifiers are listed in this article. As per our recommendation, we will suggest you to buy the “AO SMITH Z9 Water Purifier because of its RO + SCMT, hot-cold water, Min-tech, SSM technologies. Apart from this, other products will satisfy your needs as well.

If you have any questions, write to us in the comment section below. We will reply to them as soon as possible.

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