Wall Mounted RO Installation: What It Means and How to Prepare

Wall mounted RO installation means fixing the purifier to your kitchen wall with screws or a bracket and connecting it to three things: a water inlet, a drain line for the reject water, and a power socket. A trained technician usually does it in one visit. Your part is to choose a sensible spot and have the water point, drain and socket ready.

What wall mounted RO installation means

If you have seen the phrase on an order page or a service booking, it covers four jobs:

1. Mounting: marking and drilling the wall, fitting anchors, and hanging the unit level on screws or a bracket.
2. Inlet connection: tapping into a water line, usually with a connector and a small valve, and running a pipe to the purifier.
3. Drain connection: running the reject-water pipe from the purifier to the sink drain or another outlet. Every RO sends part of the incoming water to drain, carrying away the salts it removed.
4. Power and commissioning: plugging in, filling and flushing the system, checking for leaks and testing the output.

It is different from an under-sink installation, where the purifier sits in the cabinet and a faucet is fitted through the counter, and from a countertop unit, which may need no drilling at all. For a general view of what to expect from any purifier installation in India, see our water purifier installation guide.

Before the technician arrives

• Pick the wall. Near the sink, with a socket in reach and no stove beside it. More on this below.
• Find the water point. Identify which tap or line will feed the purifier and where its stop valve is.
• Check what is behind the wall. Concealed pipes and wiring often run near sinks. If you have a plumbing or electrical layout, keep it handy.
• Clear the area. Move utensils and shelves so the technician can drill and work safely.
• Test your water. Measure the TDS of your supply with a meter, or look it up for your area. This tells you whether the purifier is rated for your water, and gives a baseline to compare against after installation. Our guide to testing water quality at home explains how.
• Check your rental agreement if you rent, in case drilling needs the owner’s agreement.

Inlet, drain and power

Inlet. The technician usually fits a connector on an existing cold-water line, with a small valve so the purifier can be shut off without stopping water to the kitchen. The source might be municipal supply, a borewell or an overhead tank; the purifier’s own pump handles the low pressure typical of tank-fed homes. If your line pressure is unusually high, mention it, as some installations add a pressure regulator.

Drain. The reject-water pipe should run to the sink drain or another outlet, clamped securely so it cannot slip out and flood the counter. It should not be kinked or run uphill. Some families divert reject water into a bucket for mopping or plants; our guide to reducing RO water wastage covers what it is suitable for.

Power. Plan for an earthed three-pin socket within reach of the purifier’s cord, placed where it will not be splashed. Avoid extension boards near water. If there is no socket near the sink, get an electrician to add one before installation day.

Your wall type: brick, drywall or tile

• Brick or concrete: the simplest case. The technician drills, inserts wall plugs (anchors) and screws in. A full purifier tank adds weight, so the anchors must suit a solid wall.
• Drywall or gypsum board: ordinary plugs will not hold well. Ask for anchors made for hollow walls, or mount onto the frame behind the board.
• Ceramic tile: needs a tile drill bit, slow drilling and no hammer action, or the tile can crack. Drilling a little away from tile edges reduces the risk.
• Stone or granite backsplash: needs the right bit and patience. If you would rather not drill it, choose a spot on a plain wall section nearby.

In every case, the wall should be checked for concealed pipes and wiring before drilling. A hole through a hidden pipe is far more expensive than a few minutes of checking.

Height and placement

• Comfortable tap height for the adults who use it most, without stretching or bending.
• Glass and bottle clearance: your tallest glass, jug or bottle should fit under the nozzle with room to spare.
• Away from the stove. Heat and cooking fumes age the casing and components. Never above or right next to the hob.
• Out of direct sunlight, which warms stored water and can encourage algae in any part that lets light through.
• Close to the sink, so the drain line is short and spills land in the sink.
• Room to service: leave space around the unit so filters can be changed without taking it off the wall.
• Children: if the purifier dispenses hot water, a higher position keeps the hot outlet out of small hands.

First flush and what the technician should show you

Once the unit is mounted and connected, the technician should:

1. Flush the system. The first water through new filters carries fine carbon particles and membrane preservative, so it is run to drain or discarded rather than drunk. Ask how much to discard.
2. Check every joint for leaks with the system under pressure, including the inlet connector and the drain clamp.
3. Measure TDS in front of you: input from your tap and output from the purifier, so you can see the reduction yourself.
4. Show you the basics: how to dispense, how to shut the inlet valve, what each alert or indicator means, and what to do in a power cut.
5. Hand over the paperwork: warranty registration, the service contact and the date of installation.

In the first week, glance at the joints and the drain line for drips, and check the output TDS again. A slow leak is easiest to fix early.

How Boon installs Homie

Boon was founded in 2013 by ex-IIT Kanpur engineers, is backed by the Technology Development Board (Govt. of India), NITI Aayog and Roca, and runs water systems in more than 4,000 organisations. Boon Homie, our wall-mounted RO, is installed by Boon’s own team, not a third-party agency, and installation is free. Its WaterAI monitoring shows input and output TDS in the Boon app, so you can check the reduction yourself on installation day and afterwards. The membrane is rated for input up to 2000 TDS, which is why the pre-installation TDS check matters. Homie also has patented manual filling, so the technician can show you how to draw stored, already-purified water when the power is out.

Homie is ₹21,900 at the time of writing, on pre-order with deliveries from 15 October 2026, with a 2-year warranty and a 10-day money-back guarantee. If there is no suitable wall near your sink, or you would rather keep the counter wall clear, an under-sink purifier such as Boon Tap may suit your kitchen better.

Frequently Asked Questions

What does wall mounted RO installation mean?

It means fixing the RO purifier to your kitchen wall with screws or a bracket, then connecting it to a water inlet, a drain line for reject water and a power socket. The technician then flushes the system, checks for leaks and tests the output TDS. It differs from under-sink installation, where the unit sits in a cabinet.

How long does wall mounted RO installation take?

A straightforward installation is usually completed in a single visit, provided the water point, drain and socket are ready near the chosen wall. It takes longer if a new socket is needed, if the wall is tiled or stone and needs careful drilling, or if the inlet line needs extra plumbing. Prepare the spot in advance to keep it simple.

Can an RO purifier be installed on a tiled wall?

Yes. The technician needs a tile drill bit and should drill slowly without hammer action so the tile does not crack, keeping a little away from tile edges. Before drilling, check for concealed pipes and wiring, which often run near sinks. If you would rather not drill the tiles, choose a plain wall section nearby.

At what height should a wall mounted RO be installed?

There is no single correct height. Mount it so the tap is comfortable for the adults who use it most and your tallest glass, jug or bottle fits under the nozzle. Keep it near the sink and a socket, away from the stove and direct sunlight, and leave space around it for filter changes.

Do I need a drain for RO installation?

Yes. Every RO purifier sends part of the incoming water to drain, carrying away the dissolved salts it removed. The reject pipe is usually clamped to the sink drain. It should be secure, unkinked and not running uphill. Some families collect reject water in a bucket for mopping or cleaning instead of sending it all to drain.

Why should the first water from a new RO be discarded?

New filters release fine carbon particles, and new RO membranes contain a preservative from manufacture. Flushing the system and discarding the first water clears these out. The technician should do this during installation and tell you how much to discard. After that, check the output TDS against your input to confirm the purifier is working.