TL;DR: A concealed shower set hides the mixer body inside the wall, so every decision has to be made before tiling. Confirm the wall depth, the valve and outlet heights, your water pressure and how the valve will be serviced then hack. Changing your mind after the tiles go on means breaking them.
1Introduction: the decision you cannot undo cheaply
Quick Answer: Concealed shower sets look clean because the working parts are buried in the wall. That same feature makes them unforgiving the position, height and depth of the valve are locked in the moment the wall is closed and tiled, and fixing a mistake means demolition.
Concealed shower sets have become the default request in Malaysian bathroom renovations. They look calm and uncluttered, they leave nothing for limescale to collect on, and they photograph beautifully. All of that is true.
What gets discussed less is that a concealed set converts a simple product purchase into a construction sequence. An exposed shower bar can be swapped out on a Saturday afternoon. A concealed valve is a wet-trade job that sits behind waterproofing, screed and tile.
This guide is the planning conversation that should happen before your contractor picks up a hacking machine. It covers what goes into the wall, the heights that matter, the water pressure question that catches high-rise owners out, and how to keep the valve serviceable. Get these settled on paper and a concealed shower is an excellent choice. Skip them and it becomes the most expensive part of the renovation.
Here is what the installation actually involves behind the tile.
Watch: fitting a recessed concealed shower valve
A practical walkthrough of how a concealed valve is set into the wall, and why the recess depth matters so much.
Source: How To Fit A Recessed Concealed Shower Valve — Plumbing Tips
2What a concealed shower set actually includes
Quick Answer: A concealed set has two halves. The buried half is the valve body and its pipework. The visible half is the trim plate, handle, shower arm, rain head and hand shower. You buy them together, but they are installed months apart in a renovation.
Understanding the split explains most of the planning problems people run into.
- Valve body. The brass mixer that sits inside the wall. It has a fixed depth range it must be set within, marked on the body itself.
- Diverter. The mechanism that routes water between outlets. A two-function diverter feeds two outlets, a three-way feeds three, and so on.
- Trim plate and handle. The visible face, fitted after tiling. This is where the finish chrome, matt black, brushed gold actually shows.
- Outlets. Typically a fixed rain shower head on an arm, a hand shower on a hose, and sometimes a bath spout or body jets.
The number of outlets is the first decision, because it determines which valve you need and therefore how much wall you are opening. Browsing the concealed mixers with diverter makes the range of configurations clear before you commit.
Key takeaway: Decide how many outlets you want first. That choice determines the valve, and the valve determines the wall work.
3Concealed or exposed: the honest trade-off
Quick Answer: Concealed wins on appearance and cleaning. Exposed wins on installation cost, flexibility and serviceability. If your bathroom is already tiled and you are not renovating, exposed is almost always the right answer.
Both are good products. They suit different projects, and the deciding factor is usually the stage your bathroom is at rather than taste.
| Factor | Concealed set | Exposed set |
|---|---|---|
| When it can be fitted | Only before tiling | Any time, including a finished bathroom |
| Wall work required | Hacking, chasing, re-rendering, re-waterproofing | Two wall fixings |
| Servicing the valve | Through the trim plate only | Fully accessible |
| Changing your mind later | Needs matching valve, or tiles come off | Unscrew and replace |
| Cleaning | Minimal — flat plate, no bar or bracket | More surfaces and joints to wipe |
| Best for | New builds and full renovations | Upgrades, rentals, quick refreshes |
Compiled comparison based on installation practice and the concealed and exposed shower ranges listed in the Big Bath catalogue.
If you want the reasoning in more depth, Big Bath's earlier piece on concealed versus exposed showers works through the comparison from the user's side. The exposed shower bar sets are worth a look before you commit to hacking.
Key takeaway: The stage of your project decides this, not the styling. Tiled bathroom, no renovation planned? Choose exposed and spend the saving on a better shower head.
4The heights and depths to fix before hacking
Quick Answer: Mark the valve centre, the rain shower arm outlet and the hand shower outlet on the wall before any hacking starts. Measure from finished floor level, not from the raw slab screed and tile typically add 40–60mm that will otherwise shift every height.
These are the reference dimensions to agree with your contractor and mark up in marker pen on the wall. Adjust to the height of the people who will actually use the shower.
| Element | Typical height / depth | Why it matters |
|---|---|---|
| Valve centre | 1,000–1,200mm | Must be reachable from outside the spray to turn on |
| Rain shower arm outlet | 2,000–2,200mm | Head must clear the tallest user with room to spare |
| Hand shower outlet | 1,000–1,200mm | Hose should reach the floor for cleaning |
| Wall recess depth | Per valve body markings | Too deep and the handle will not reach; too shallow and the plate will not sit flat |
| Valve horizontal position | Near the entry side | Lets you start the water without standing under a cold spray |
Compiled reference. Heights reflect common Malaysian installation practice and should be adjusted to user height; recess depth is always governed by the specific valve body's marked limits.
The recess depth deserves emphasis because it is the failure that cannot be corrected. Every concealed valve body carries minimum and maximum depth markings for the finished wall surface. Set it outside that range and the trim plate will not seat properly against the tile and the only remedy is removing tiles.
Key takeaway: Measure every height from finished floor level, and set the valve depth strictly within the markings on the valve body. Those two rules prevent most concealed-shower disasters.
Not sure which valve suits your wall?
See the valve bodies and trim options in person before your contractor starts — visit a Big Bath showroom →
5The installation sequence, and the point of no return
Quick Answer: The point of no return is the pressure test, not the tiling. Once the valve is set, connected and the wall is closed, changing the outlet configuration means reopening the wall. Everything before that stage is still adjustable.
Renovations go wrong when the shower set is bought at the wrong point in this sequence — usually too late, after the walls are already closed.
| Stage | What happens | Still changeable? |
|---|---|---|
| 1. Selection | Valve, outlets and finish chosen; heights marked on the wall | Everything |
| 2. Hacking & chasing | Wall opened, pipe routes cut | Heights and positions, at some cost |
| 3. Valve set & piped | Valve fixed at depth, supplies and outlets connected | Outlet count, with rework |
| 4. Pressure test | System held under pressure and checked for leaks | Last easy chance |
| 5. Waterproof & render | Membrane applied, wall made good | Nothing structural |
| 6. Tiling | Tiles laid up to the valve opening | Nothing |
| 7. Trim fitted | Plate, handle, arm and heads installed | Finish only, if the valve matches |
Compiled installation sequence based on standard Malaysian wet-trade practice for concealed shower valves.
Buy the shower set before stage two. Contractors need the actual valve in hand to chase the wall correctly not a model number, not a photograph. Waiting until the tiler is booked is how projects lose a fortnight.
Key takeaway: Buy the concealed set before the hacking starts. The physical valve has to be on site to set the wall out correctly.
6Water pressure: the question high-rise owners must ask first
Quick Answer: A large rain shower head spreads the same flow over a much wider area, so it needs decent pressure to feel like anything. On upper floors of condos with gravity-fed tanks, that pressure often is not there and a buried valve is the worst place to discover it.
This is the most common disappointment with concealed shower sets, and it has nothing to do with the valve. It is a supply problem.
A 300mm rain shower head distributes water across roughly nine times the area of a standard hand shower. With strong pressure that feels like standing under warm rain. With weak pressure it feels like a drizzle you cannot rinse shampoo out under. The head is not faulty it is being asked to do something the supply cannot support.
- Test before you buy. Run the existing shower at full flow at the time of day the bathroom gets used most. If it is already weak, a rain head will make it feel weaker.
- Check your building's supply type. Gravity-fed rooftop tanks give less pressure to the upper floors of a block than to the lower ones.
- Consider a pump. A water pressure pump is the standard remedy, and it is far cheaper to plan for now than to retrofit later.
- Right-size the head. If pressure is genuinely limited, a smaller rain head or a good hand shower will outperform an oversized one.
Big Bath's guide on improving household water pressure covers the remedies in more detail. Settle this before the wall closes, because a pump usually needs space and power planned in.
Key takeaway: Test your water pressure before choosing a rain head size. Matching the head to your actual supply matters more than the diameter on the box.
7Choosing the configuration and finish you will still like
Quick Answer: Two-function sets cover most households rain head plus hand shower. Additional functions add body jets or a bath spout, and each one adds pipework inside the wall. Choose the finish across every fitting in the room at the same time, because matching later is difficult.
Concealed mixers are configured by how many outlets the diverter can feed. The range on offer maps closely to how households actually shower.
| Configuration | Typical outlets | Wall complexity | Suits |
|---|---|---|---|
| Two function | Rain head + hand shower |
|
Most homes and condos |
| Three way | Rain head + hand shower + bath spout |
|
Bathrooms with a tub |
| Four function | Adds body jets or a second head |
|
Larger master bathrooms |
| Five function | Full spa arrangement |
|
Purpose-designed wet rooms with strong pressure |
Compiled from the concealed mixer with diverter configurations listed in the Big Bath catalogue two function, three way, four function and five function models across chrome, satin, matt black, matt gold, brushed gold and brushed rose gold finishes.
On finish, one practical warning. Matt black and brushed gold look superb and are widely available, but you are committing the whole bathroom to that palette taps, accessories, floor waste and shower screen fittings all need to agree. Decide the finish once, for the room, not fitting by fitting.
Key takeaway: Two function suits most households. Choose your finish for the entire bathroom at once — mixing suppliers later rarely produces a true match.
8Servicing a valve that lives inside a wall
Quick Answer: A good concealed valve is serviced through the trim plate the cartridge withdraws forward without touching the tiles. Confirm this is possible with your chosen valve, and confirm that replacement cartridges will be available years from now.
Cartridges are wear parts. They are the component that eventually drips or stiffens, typically after several years of daily use, and every concealed valve will need one at some point.
The question to ask before buying is therefore not whether it will need service, but how. Two answers matter:
- Front serviceability. Can the cartridge be removed through the wall opening once the trim plate comes off? If yes, a service call is a straightforward visit. If no, tiles come off.
- Parts availability. A shower valve installed today should still be repairable in ten years. This is the practical argument for buying from a supplier that stocks spares long term rather than the cheapest online listing.
It is also why Big Bath's lifetime warranty and long-term spare parts stocking matter more on a concealed set than on almost any other bathroom product the cost of a part being discontinued is measured in broken tiles.
Key takeaway: Ask two questions before buying: can the cartridge be changed from the front, and will spares still exist in ten years? Both are more important than the finish.
9Conclusion: settle it on paper, then hack
A concealed shower set is a good decision made at the right moment and an expensive one made late. The difference is entirely in the planning: outlets chosen, heights marked from finished floor level, valve depth confirmed against the body markings, water pressure tested, and serviceability checked.
Do that, and the wall gets opened once. That is the whole objective.
10Frequently asked questions
Can I install a concealed shower set without hacking the wall?
No. The valve body has to sit inside the wall, which means chasing out a recess, running pipework and making the wall good afterwards. If you cannot hack, an exposed shower set is the right choice.
At what height should a concealed shower valve be installed?
Around 1,000–1,200mm above finished floor level, positioned towards the entry side of the shower so you can reach in and start the water without standing under it. Adjust for the height of the people using it.
What happens if the valve is set too deep in the wall?
The handle and trim plate will not reach the finished tile surface correctly, and the set cannot be assembled properly. Because the valve is buried behind waterproofing and tile, correcting it means removing tiles — which is why the depth markings on the valve body must be followed exactly.
Do concealed showers need more water pressure than exposed ones?
The valve itself does not, but the large rain heads usually paired with concealed sets do. Spreading the same flow over a wider head makes weak pressure much more noticeable. Test your pressure before choosing head size.
Can a concealed shower valve be repaired later?
Yes, if the valve is designed to be serviced from the front. The cartridge is withdrawn through the wall opening after the trim plate is removed, with no tiling disturbed. Confirm this and the availability of spare cartridges before you buy.
When should I buy the shower set during a renovation?
Before any hacking begins. Your contractor needs the physical valve on site to chase the wall to the correct depth and position a model number is not enough.
Planning a concealed shower? Talk it through before the wall opens.
Big Bath specialists can check your outlet configuration, valve depth and water pressure against your bathroom plan and set your contractor up with the right information from the start.
Speak to a shower specialist
