Recessed vs. Surface-Mounted Cabinet

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When buying a manifold for underfloor or radiator heating, sooner or later you'll run into a question that looks purely technical at first glance, but actually has a significant effect on how the whole renovation or new build proceeds: should the manifold cabinet be recessed, or surface-mounted? There's no universal answer - it depends on what stage of construction you're at, on the wall's thickness and structure, and on whether it's a flat, a family house, or a space where only the manifold is being changed without touching the masonry. In this article we go through both solutions practically, with real dimensions, prices and experience from everyday installation, so you can decide without unnecessary back-and-forth with your installation company.

What exactly recessed and surface-mounted cabinets mean

A recessed cabinet is designed so its whole body is set into the wall or partition. Only the frame with the door protrudes from the plaster, or sometimes just the door itself, flush with the wall surface. The cabinet body is fitted into a chiselled-out groove or niche, or one left open during shell construction, anchored into the masonry, plastered around the edges, and then given the same paint finish as the rest of the wall. The result is a solution that visually almost blends into the wall - you only see a narrow door frame, no box protruding into the room.

A surface-mounted cabinet, by contrast, sits entirely on the wall surface. It isn't fitted into any groove, it's simply anchored with plugs or screws directly onto a flat surface (typically in a utility room, garage, hallway or basement), and the manifold and pipework stay visible inside the closed box. So instead of being recessed into the masonry, the cabinet physically "steps out" in front of the wall - usually by the depth of the cabinet body itself, which for common underfloor heating manifold models is roughly 110 to 130 mm.

So the difference isn't in function - both variants equally hide and protect the manifold, both have ventilation openings, both can be locked or at least closed with a door. The difference lies purely in how and at what stage of construction they can be installed, and what visual and building impact they have on the room they're in.

Installation sequence - the recessed version has two extra "wet" steps (plastering, painting); the surface-mounted version is finished as soon as the pipework is connected.

Advantages and disadvantages of both solutions

To compare realistically, it helps to see both sides side by side - not just aesthetics, but what will actually cost you time and money.

Recessed cabinet

The biggest advantage is appearance - in a living room, hallway or entrance hall, you'll barely notice that technical equipment is hiding behind the door. The cabinet doesn't intrude into the room's free space, which you'll appreciate especially in smaller flats, where every centimetre of hallway affects how furniture fits through. The downside is that installation is tied to the shell-construction stage, or at least to the stage before final plastering - fitting it later into an already finished and painted wall means breaking out, dust, plaster repair and a new coat of paint. This variant also requires a sufficient wall thickness (usually at least 150 mm of masonry, to leave a margin of solid material around the recessed cabinet body) and somewhat more thorough preparation by the installation company, since the position has to be accurate to the millimetre before plastering starts.

Surface-mounted cabinet

The biggest advantage is simplicity and speed of installation - all you need is a flat section of wall, four anchors, and the cabinet is ready for the pipework to be connected within tens of minutes, with no breaking out and no waiting for plasterers. It can be installed at any time, even in an already lived-in and painted space, which is exactly why it's so popular for replacing an old manifold with a new one, or for later expanding a heating system. The downside is that the cabinet physically protrudes into the room - for the models in this article, the depth is roughly 110 to 130 mm, which nobody minds in a utility room, garage or basement, but would look intrusive in a living room.

When to choose a recessed cabinet

The recessed variant makes sense mainly when you're building or renovating and this stage is still ahead of you - that is, when the groove's position and depth can still be fine-tuned before plastering. Typically this applies to family houses and flats where the manifold is located in a living area (entrance hall, hallway, closet) and the owner wants the equipment to be as invisible as possible. If you're planning to change or expand the heating system in the future, think carefully about the margin around the manifold too - a recessed solution is harder to enlarge later, since it would mean chiselling into an already finished wall again. We therefore recommend choosing a size class larger at the design stage than what you strictly need right now.

A practical example from everyday work: in a new-build family house with underfloor heating on 8 circuits, the manifold is commonly placed in a closet or a technical niche in the entrance hall. The electrician and the plumber agree the cabinet's position with the site manager before the partition it's meant to be recessed into is even built - at this stage, changing the position or size is a matter of minutes; after it's bricked in, it would be a whole day of breaking out and repairs.

When to choose a surface-mounted cabinet

The surface-mounted variant is the clear choice when replacing an old manifold with a new one in an already lived-in flat or house - nobody's going to break out a wall just for servicing. It's equally worth it anywhere the manifold is located in a space where aesthetics don't play the main role (boiler room, utility room, garage, basement, space behind a wardrobe), and speed of installation and easy access for future servicing are valued instead. A very common case is also buying a second manifold when expanding underfloor heating to more rooms or another floor - where the plastering and painting are already finished, a surface-mounted cabinet is the only sensible solution without unnecessary building work.

A common real-world scenario: a flat owner is additionally insulating and heating an attic bathroom that originally had no underfloor heating. The electrician and plumber are already working in a finished, painted space - the only realistic option is a surface-mounted cabinet fitted in an adjacent technical niche, connected by a short section of pipe to the existing riser.

Cabinet dimensions based on the number of manifold circuits

Besides the installation type (recessed/surface-mounted), you also need to sort out the right cabinet size, which depends on the manifold's width, that is, in practice, on the number of circuits you want to connect. In our range of surface-mounted cabinets you'll find three common width classes - 385 mm, 485 mm and 615 mm. In general, the 385 mm cabinet comfortably fits a manifold with up to roughly 6 circuits, the 485 mm handles a manifold with up to roughly 9 circuits, and the 615 mm is designed for larger manifolds with 10 or more circuits, including the space needed for operating elements (air-vent valves, actuators, or a mixing module). It's always sensible to allow a small margin - a tight cabinet makes both future maintenance and adding a circuit later harder.

Approximate recommendation based on cabinet body width - at a borderline number of circuits, always choose the larger model.

Specific surface-mounted cabinet models

For a better picture, here are three specific surface-mounted cabinets from our range, covering the whole common range of home and smaller flat installations.

Manifold cabinet 385 mm - surface-mounted - the most compact model, suitable for smaller flats and manifolds with up to roughly 6 circuits, ideal for a technical niche or entrance hall without unnecessary protrusion into the space. Price from €63.10.

Manifold cabinet 485 mm - surface-mounted - the medium, most versatile size for family houses with a manifold on up to roughly 9 circuits, leaving enough room for actuators and air-vent valves too. Price from €67.53.

Manifold cabinet 615 mm - surface-mounted - the largest model for manifolds with 10 or more circuits, typically in larger houses with both underfloor and radiator heating connected to a single manifold. Price from €75.15.

As you can see, the price only rises gradually with size - the difference between the smallest and the largest model is around €12, so it's definitely not worth saving on cabinet size and risking a tight manifold or being unable to add another circuit later.

Cost and time - a real-world comparison

The price of the cabinet itself is only part of the budget - the recessed version also requires labour for chiselling out/preparing the groove, anchoring, and above all the subsequent plastering and painting, which for an ordinary installation company represents several extra hours of work compared to the surface-mounted version, which is finished as soon as the pipework is connected. In a new build, where the whole house is being plastered anyway, this cost difference is practically negligible, since the plasterers are coming to the site regardless. In a renovation of an already finished and painted flat, it's exactly the opposite - additional plastering of a single spot and matching it to the surrounding paint (colour shade, texture) can be surprisingly laborious, and more expensive in both time and money, than the cabinet installation itself.

Our practical recommendation: for a new build or a larger renovation where plastering is happening anyway, consider the recessed version for better appearance. For replacement, servicing, or expanding a system into an already finished space, go for the surface-mounted version without hesitation - you'll save yourself unnecessary building work and time.

What fits in the cabinet and what to think about when choosing

A manifold cabinet isn't just an empty box to hang on the wall or set into a partition - inside there needs to be enough room not just for the manifold itself with its supply and return branches, but also for all the accessories that get added to it over time. These mainly include actuators on individual circuits (if the system is controlled by room thermostats via electric heads), or a mixing module with a circulation pump, if the manifold is connected directly to a heating circuit with lower water temperature than the boiler's. With smaller cabinets it often happens that the manifold technically fits, but there's no room left for the actuators, or the door stops closing properly once they're fitted. So when choosing a size, it's worth planning not just for the current number of circuits, but also for whether you plan to add thermostatic control of individual rooms in the future.

Ventilation is equally important. Inside the cabinet there's hot water, and possibly a pump too, which warms up slightly during operation - without adequate ventilation (perforated side walls or a door with a grille), unnecessary moisture and heat build up inside, which in the long run isn't good either for the components themselves or for the surrounding wall on the recessed version. So when choosing a model, always check that the ventilation openings are large enough and won't be covered by anything once installed - typically furniture on the surface-mounted version, or tiling on the recessed one.

Practical experience from real projects

In everyday construction practice, it's worth deciding on the cabinet type together with the heating designer already at the design stage, not only on site. Too often it happens that the electrician, plumber and bricklayer each have their own idea of exactly where the manifold should sit, and the decision gets made on the fly, on site, under time pressure. The result is usually either a cabinet that's too small (because "there's no more room there"), or a poorly chosen installation type that complicates further work. If you agree the cabinet's type and size in advance, you avoid unnecessary improvisation.

A second common situation is combining both types in one building - for example in a two-storey house with two separate manifolds (one for the ground floor, one for the upper floor). It's not unusual for the manifold in the ground-floor living hall to be handled as recessed (for appearance near the main entrance), while the manifold for the upper floor is placed in a closet niche or technical space as surface-mounted, since aesthetics matter less there. So when designing, you don't have to stick to one solution for the whole house - what matters is choosing the right type for each specific location separately.

A third common case is renovating a bathroom core, where the original, often undersized manifold is replaced with a new one with more circuits (for example when adding a bathroom extension with underfloor heating to the original flat). Here the surface-mounted cabinet almost always wins, simply because the flat is already lived in and painted, and unnecessary breaking out would extend the renovation by extra days with no real benefit.

Most common mistakes to avoid

The first common mistake is a poorly estimated cabinet size - when the manifold "just barely" fits, there's no room left for future servicing, replacing actuators, or adding a circuit. The second mistake, for the recessed version, is insufficient wall or partition thickness - if the partition is thinner than the cabinet body, either the other side of the partition risks bulging out, or the cabinet simply doesn't sit flush and the door doesn't close properly. The third, very common mistake is forgetting about servicing access - even if the cabinet is beautifully recessed into the wall, the door has to be freely openable, meaning no furniture can stand in front of it, and it mustn't open in a direction where it would hit a door or a wardrobe. Finally, the fourth mistake is underestimating ventilation of the space around the manifold, especially if it's connected to a heat source with a higher temperature - the cabinet's ventilation openings should never be covered by anything.

Frequently Asked Questions

Can a recessed cabinet be installed later into an already finished wall?

Technically yes, but in practice it means chiselling a groove into finished masonry, dust, and repairing the plaster and paint around the whole cabinet. If the building is already standing and painted, it's simpler and cheaper to go for the surface-mounted version.

What wall thickness is needed for a recessed cabinet?

At least around 150 mm of masonry is recommended, so there's enough margin of solid material left on both sides of the partition around the recessed cabinet body.

Can I later "brick in" a surface-mounted cabinet and turn it into a recessed one?

This isn't a common practice, since surface-mounted models aren't structurally designed to be set into masonry (for example, they lack a suitable mounting frame for plastering around). If you want a recessed solution, it's better to choose a cabinet designed directly for recessed installation from the start.

What cabinet size suits an ordinary 4-room family house?

For a typical family house with underfloor heating in the living rooms, a manifold with 7-9 circuits is most commonly used, corresponding to a cabinet with a width of 485 mm. For a larger house, or a combination of underfloor and radiator heating on one manifold, the 615 mm variant is more suitable.

Is a surface-mounted cabinet less safe or lower quality than a recessed one?

No, there's no difference between the variants in terms of function or build quality - both protect the manifold equally well, have comparable ventilation, and can both have a lockable door. The difference lies purely in the installation method and the visual result.

Can a larger manifold be fitted into a surface-mounted cabinet later?

If the new manifold is wider than the original cabinet, the cabinet itself has to be replaced with a larger model too - which is exactly why it's always worth choosing a size class larger than what you strictly need at the first installation.

Have a question about this topic?

Not sure what to choose, or dealing with a specific situation in your home? Write to us - we're happy to help.