These days, you can see the RO Water Purification system in almost every household in India, especially in the urban cities.

And, while the wall-mounted water purifiers are used by most people, there is also another type of purifiers known as under sink water purifiers.

These are actually considered by the people living in urban areas with smaller kitchen spaces.

What is Under Sink Water Purifier?

Under sink or under counter water purifiers are similar to the normal RO purifiers but can be installed under the sink counter instead of wall mounting.

These are designed to be installed with built-in sinks in the modern kitchens as an attempt to hide the purifier and keep the kitchen interiors minimalist.

  • They have a higher purified water delivery rate.
  • Water flow is fast due to the large hydro-static air pressurized bladder tank.
  • It takes just 15 seconds to fill up a 1 liter bottle.
  • Ideal for modern kitchens where you don’t want to disturb the look using a wall mounted purifier.
  • Suitable for kitchens with space constraint.
  • Eliminates the mess (water spilling) on the floor as the faucet is equipped behind the sink tap.
  • Require very little maintenance, excluding the filter change.
  • Since there are no design limitations like the wall mounted or countertop water purifiers, these under sink purifiers come with more tank storage.
  • Mostly suitable for newly constructed houses or apartments as you’ll need a dedicated power socket beneath your sink, faucet hole on your sink, drain pipe to get the waste water out of the kitchen. However, you can ask your plumber/electrician to arrange it for you.

Types of Under Sink Water Purifiers

The under counter water purifiers come in two types – one with inline filters and another with regular filters.

1.Inline Filters:

These inline filters come with a single cartridge and are installed using the push fittings along with your regular water source.

Though the installation is a bit difficult, they let you use your sink tap on while the water flows through the purifier.

2.Regular Filters:

These are regular filters that require a separate or dedicated filter tap. You can use a T-connector to install the second tap for the filtered water.

Whatever the filter type you choose, ensure that you buy the best under sink RO purifier with TDS controller at any cost.

Note: As expected with every RO filter, these under the counter water purifiers also waste a lot of water (650ml for 1 liter of purified water). So, try to collect and use the waste water for plants, washing utensils, toilets etc…

List of Best Under Sink Water Purifiers in India

Water Purifier BrandFilter TechnologyStorage CapacityWarranty
1.Kent Excell+ Under the Counter Water PurifierRO+UV+UF+TDS Controller7 liters1 Year
2.A.O Smith Z2+ Under the Counter RO PurifierRO+SCM-Tech+MIN-Tech5 liters1 Year
3.Kent Sterling+ Under Sink Water PurifierRO+UV+UF+TDS Controller6 liters1 Year
4.Havells UTC Water PurifierRO+UV+Mineralizer+Revitalizer8 liters1 Year
Find the difference between RO vs UV vs UF vs MF Purifiers

1.Kent Excell+ Under the Counter Water Purifier

Kent is one of the best home appliance brands in India that makes household products such as air purifiers, vacuum cleaners etc…

The Kent Excell under sink RO purifier comes with RO + UV + UF + TDS controller features.

Kent Excell Plus Under Sink RO Purifier

While the RO and uV helps remove the dissolved impurities from the water, the TDS controller helps retain the essential minerals in the water and also make it tasty to drink.

It has a certified food-grade plastic tank with storage capacity of 7 liters and water purifying speed of up to 15 liters per hour.

The RO purifier comes with UV fail and filter change alarms.

It comes with free installation from the company and also has 1 year free service.

You can directly call the Kent customer care @ 9278912345 to get it installed for free of cost, after you received the product.

  • Multi-stage water filtration
  • RO+UV +UF+ TDS Mineralizer
  • Decent storage tank capacity
  • Easy to install
  • Leak proof design
  • Supports TDS levels of 500 to 2500
  • 1 Year Warranty + 3 Years No Service Charge
  • Nothing in particular

2.A.O Smith Z2+ Under the Counter RO Purifier

The A.O Smith Z2+ water purifier comes with 6S technology that provides drinking water after it goes through a 6 stage purification process.

AO Smith Z2 Plus Under Sink Water Purifier

Apart from the regular filters like the pre-filter, sediment filter, pre-carbon filter and RO membrane, this under sink purifier also comes with two additional filters such as:

  • SCM-Tech: It is nothing but the silver activated post carbon filter
  • MIN-Tech: This filter adds the essential minerals to the water such as Calcium and Magnesium.

It comes with 5 liter storage capacity and the tank is made of ABS grade plastic that is durable & long-lasting.

The Z2+ purifier supports TDS levels up to 2000ppm and water hardness levels up to 400ppm.

Thanks to the patented SSM technology, the water purifier minimizes the wastage of water in the purification process.

It sports a digital display that shows stats like filter change alarm and other indicators.

It comes with a 1 year warranty and free installation service in municipal limits and beyond the limits, you’ll need to pay just the up-down travel charges.

Don’t forget to call the customer care @ 1800 103 2468 or 1860 500 2468 to know about the installation details.

  • Smart design with leak proof cabinet
  • Easy to install and use
  • 6 stage filtration technology
  • Certified by WQA
  • Patented SSM technology (reduces water wastage)
  • 1 year warranty
  • No UV/UF purification

3.Kent Sterling Plus Under the Sink Water Purifier

 The Sterling+ is another good under the counter RO purifier model from Kent that comes in a beautifully enclosed leak-proof cabinet.

Kent Sterling Under Counter Water Purifier

You can also place the purifier beside the refrigerator if not under the sink to utilize the space more efficiently.

The purifier technology includes RO + UV + UF + TDS controller.

The mineralizer helps add missing minerals in the water and the TDS controller sees that the water is tastier to drink.

The purifier system comes with a 6 liter hydrostatic storage tank (in-built) to provide good water pressure to the sink top.

The system purifies up to 20 liters of water per hour and it comes with free installation & 1 year warranty.

  • Multi-stage water filtration process
  • Patented Mineral RO technology
  • Good storage capacity
  • Taste enhancer
  • Easy to install
  • 1 year warranty
  • Could have provided indicators for water level and power on

4.Havells UTC 100% RO & UV Water Purifier

Havells is another popular Indian brand that has a line-up of amazing home appliances like ceiling fans, water heaters, microwave oven etc…

HAVELLS UTC Under Sink Water Purifier

The Havells UTC purifier comes with 8-stage purification technology that include:

  1. Membrane performance enhancer
  2. Sediment filter
  3. Activated carbon filter
  4. RO membrane
  5. Mineralizer
  6. Silver impregnated taste enhancer
  7. Revitalizer
  8. Germicidal UV filter

This under-sink RO purifier comes with 8 liter storage capacity and the tank is made of ABS grade plastic.

The purifier system comes with height-extended foot on all the four sides for easy maintenance.

The installation is free and you get 1 year onsite warranty with free service included.

  • 8-stage purification technology
  • Brand trust (Havells)
  • 8 liter storage tank
  • Easy to install & maintain
  • 1 year warranty
  • A bit expensive than the other models in the list

Under Sink RO – FAQs

How much does an Under sink RO purifier cost in India?

The price of an under sink water purifier from a good brand like Kent or AO Smith starts from Rs.10000 and goes up to Rs.20000, depending on the features like storage capacity and filtration technology used.

How long do under sink water filters last?

An average household with 3 to 4 members’ family should change the filters every 6 to 8 months and this decreases with the members count.

How to install a water purifier under the sink counter?

It is very easy to install the RO purifier under the counter as long as you have the prerequisites like a dedicated power socket under the sink, drainage system and faucet hole on the sink top.

You can always get the under sink purifier installed for free of cost by the manufacturer.

How to change the filter under my sink?

It is the same as you do with your wall mounted water purifiers. Just remove the cabinet and plug-out the filter connections before taking the filters out of the system. Replace them with new ones from the same brand to ensure proper functioning of the water purifier.


The under sink water purifiers are widely used in the foreign countries like the USA, but have recently entered the Indian market.

They are very much similar to the regular wall mounting or countertop water purifiers, but the installation is a bit different.

Of all the purifiers in the list, the Kent Excell+ Under the Counter RO purifier is our best pick as it is both budget friendly and ticks all the requirements.