Choosing a Water Purifier for a Rented Flat in Delhi

Check these before you buy anything

Five minutes of checking in the flat saves the most common tenant mistake, which is buying a unit that will not work well where you have to put it.

• Is there a socket near the sink? A purifier with a pump needs mains power within reach, on a socket that is not shared with something heavy. Running an extension lead across a wet counter is not an option worth considering.
• Where does the drain water go? A membrane-based unit produces a continuous drain flow while it runs, and that tube has to reach the sink waste or a bucket. If your only sink is across the kitchen, plan for it.
• What is the water pressure like at your floor and at the hours you use it? Fill a bucket at 8am and again at 8pm. Weak flow at a high floor or on a gravity feed from a rooftop tank affects which units will work — see low water pressure in Delhi.
• What is the supply and what is the water like? Ask the landlord and the neighbours whether the building is on a DJB line, a borewell, tankers or a mix, and whether that changes in summer. NCR readings vary enormously street to street, so the answer genuinely changes what suits you.
• Is there already a unit fitted? If so, find out its age and when it was last serviced before you move in, and write what you find into the inventory.

Which types actually suit a rented flat

The right choice depends on your water, not on the tenancy — but the tenancy narrows how it can be installed. Here is what each option means practically for a renter.

• Countertop or table-top units. These sit on the counter and need no wall fixing at all, which makes them the simplest rental answer. The trade-off is counter space and usually a smaller storage tank, which matters in a Delhi summer when the household drinks more.
• Wall-mounted units. The standard installation, and the one that puts holes in a wall you do not own. If you go this way, get the mounting agreed in writing and keep the fixings, because the same bracket pattern usually re-mounts in the next flat.
• Under-sink units. They free the counter and hide the machine, but they need a tapped inlet, a drain connection and often a hole cut in the counter for the dispensing tap. That is a permanent alteration and needs the landlord’s agreement, not a shrug.
• Gravity or non-electric filters. No power, no plumbing, nothing fixed to a wall, and nothing to move but the jug. What they do mechanically is limited compared with a membrane system, so whether they suit depends entirely on your water. Get a test report and read our RO vs UV guide rather than guessing.
• Rental or subscription purifiers. Available across NCR, and the installation and servicing are the provider’s problem rather than yours. Read what happens when you move or cancel, and who owns the fittings left in the wall.

Our purifier choosing tips cover the technology decision in more depth; this page is about the tenancy constraints on top of it.

Landlord permission and wall damage

This is where tenants lose deposits. The work involved in a purifier installation is small, but it is still holes, a tapped water line and sometimes a cut counter.

• Ask in writing, even informally. A message on WhatsApp saying what will be drilled and where, with a reply agreeing, is enough to prevent the argument at move-out. Verbal agreement with a landlord you have met twice is not.
• Be specific about what is being altered. Wall fixings, an inlet tee on the kitchen supply line, a drain connection into the sink waste, and any hole cut in the counter. The counter is the one that causes real disputes.
• Photograph the wall and counter before installation, and keep the photos with your agreement. Do the same on the day you leave.
• Agree what happens at move-out. Will you fill and touch up the holes, leave the bracket, or remove everything? Deciding this on day one costs nothing and settles it.
• Prefer reversible where you can. A countertop unit and a push-fit inlet tee that can be removed leave far less behind than an under-sink installation with a cut counter.

The unit was already there and it has stopped working. Who pays?

This depends on your agreement, so read it first. What follows is how the conversation usually goes rather than a statement of your rights — our tenant vs landlord repairs guide covers the wider principle.

• Consumables are usually the tenant’s. Filter cartridges are consumed by use, like a gas cylinder. If you are drinking the water, you are generally the one replacing the pre-filters — see when to change an RO filter.
• Component failure is usually the owner’s. A failed pump, adaptor, tank or membrane on a unit that came with the flat is a repair to the landlord’s equipment. Raise it in writing with a photo, promptly.
• Neglect before you arrived is worth documenting. A unit that had not been serviced for years before your tenancy is not a bill you created. This is why noting its condition at move-in matters so much.
• If there is an AMC, find out who holds it. Many landlords keep an annual contract running on equipment left in the flat. Ask for the provider’s contact rather than calling someone new — our AMC guide explains what these usually cover.
• Get a diagnosis before the argument. A written finding from a technician turns “it stopped working” into “the adaptor has failed”, which is a much shorter conversation. Our RO not working guide helps you narrow it down first for free.

Taking the purifier with you when you move

Purifiers survive moves badly when they are treated like furniture. They are a box of water-filled housings and brittle tubing.

• Drain it before it goes on the truck. Close the inlet, switch it off, open the dispensing tap and let the storage tank empty. A full tank shifting inside a moving vehicle is what cracks fittings.
• Photograph the tubing before disconnecting anything. Which tube goes to which port is easy to get wrong on reassembly and easy to get right from a photo.
• Move it upright and padded. The housings and the membrane vessel do not appreciate being laid on their side under boxes.
• Do not carry old water across. If the unit will be idle for more than a few days, drain it fully and flush it through when it is reinstalled rather than drinking what stood in it.
• Retest at the new address. This is the step everyone skips. A unit that suited your old borewell supply may face completely different water two kilometres away. Measure the input at the new flat and read our water test report guide before deciding whether it still fits.
• Reinstalling is a technician job on most units. Push-fit connectors that have been disturbed leak, and a leak under a rented sink is an expensive way to learn that.