Accessories - Doors and Frames

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Accessories - Doors and Frames for Manifold Cabinets

When people say "manifold cabinet", most picture just the metal or plastic body that houses the underfloor heating manifold, ball valves, and possibly actuators and control electronics. In reality, though, the cabinet's door and frame are just as important a part of the whole solution as the body itself - and that's exactly what this article covers in detail. We'll explain what the door and frame are actually for, what types exist, how they're chosen based on the installation type (surface-mounted vs. recessed), what to watch out for when ordering and installing, and we'll also look at specific products from our range where these accessories are already included in the package.

Why the door and frame are an important part of the cabinet

An underfloor heating or heating-circuit manifold isn't a component that needs to be constantly on view - on the contrary, it's a technical element that should be as unobtrusive as possible in the interior, while still being quickly accessible at any time for servicing, bleeding circuits, or adjusting flows. That's exactly the dual role the door plays: on one hand it hides the technical components from view, on the other it allows simple, quick opening without having to dismantle anything else.

The frame has a different but equally important function - especially with recessed installation, that is, when the cabinet body is set directly into masonry or a partition. In this case the frame covers the gap between the plaster (or tiling) and the cabinet's metal body, creates a neat visual transition between the wall and the door, and also carries the door mechanically - the hinges and lock are fixed to it, not directly into soft plaster. Without a good-quality frame, the door would eventually start "sagging" out of the wall, or cracks would appear in the plaster around the cabinet.

In practice, it's worth looking at the cabinet, door and frame as one functional unit, not as three separate items. That's exactly why, in our range too, cabinets are usually sold as a complete set - body, door and frame together (with surface-mounted versions, the frame is replaced by a simpler transition edge, since the cabinet sits on the wall surface and there's no gap to mask).

Anatomy of a cabinet - where exactly the door and frame sit

To make clear which part of the cabinet the text refers to, let's look at a simple diagram of how the whole component is put together. The body (a metal or plastic tub) is the base that holds the manifold and heating circuits. The frame connects to the body, lines the opening, and acts as the load-bearing element for the hinges. The door is fixed to the frame and opens into the room, and finally the door carries a handle or lock, through which it's normally opened and closed.

The diagram shows that a problem in any of these four parts affects the overall functionality. A crooked frame means the door won't close properly. A damaged door hinge means the door gradually sags and loses its seal. A poor-quality lock starts sticking after a few years, or can only be opened with effort. That's exactly why it's worth investing in a complete, proven set, rather than combining a body from one manufacturer with a door from another - dimensional and mounting tolerances differ between manufacturers.

Surface-mounted vs. recessed installation - the difference in doors and frames

The installation type fundamentally affects how the door and frame should look and work. With a surface-mounted cabinet, the whole cabinet body (including the door) is fixed on the wall surface - so the cabinet "protrudes" from the wall by roughly the depth of its body. With this type, the door is usually part of one compact box, and you practically don't need a separate frame piece, since there's nothing to mask - the cabinet's edge is visible and is part of the design.

With a recessed cabinet, the situation is different - the body is set into masonry or a plasterboard partition so it's flush with the wall surface. In this case a frame is essential, since it covers the transition between the plaster/tiling and the cabinet's metal body, while also carrying the door. Doors on the recessed version tend to be somewhat more refined - often with the option of being repainted or tiled with the same material as the rest of the wall, so they blend in with their surroundings.

Surface-mounted versions currently dominate our range, since they're simpler to install (no need to touch the masonry) and are especially suited to utility rooms, garages, storage rooms, or anywhere aesthetics aren't a priority. For living spaces, where the cabinet should be as inconspicuous as possible, it's worth considering a recessed solution with a frame, or consulting our customer service about the choice based on your specific situation in the flat.

Door materials and surface finish

Manifold cabinet doors are, in practice, made predominantly from galvanised or painted steel sheet, and only rarely from durable plastic in cheaper or smaller solutions. Galvanised sheet protects the door from corrosion even in a damper environment (for example an unheated utility room or basement), while a painted finish adds an aesthetic dimension - most often in white (RAL 9010 or a similar shade), which matches the white walls found in most Slovak homes.

A simple rule applies when choosing door colour: the more visible the installation location, the more it's worth thinking about matching the surroundings. In a hallway or living room, it's worth choosing white, or a door intended to be repainted with your own wall colour. In a utility room, boiler room or garage, on the other hand, colour usually isn't an issue - functionality, hinge strength and easy lock operation even with gloves on matter more.

Locks and handles - what to watch out for

The standard version uses a simple magnetic or latch lock without a key - the door closes with a push and opens by pulling the handle or a slightly recessed edge. This solution is practical wherever the manifold is accessed often (for example for seasonal heating adjustments). If the cabinet is located in shared spaces of an apartment building (for example a hallway near the risers) or somewhere accessible to children, we recommend considering a keyed-lock version, which prevents unqualified interference with the manifold's settings.

How door and frame installation works

Installing the door itself on new cabinets is simple, since they arrive from the factory already assembled onto the body's frame - so after fitting the body into or onto the wall, you just need to fine-tune the alignment and, if necessary, tighten the hinge screws. Replacing a damaged door on an older cabinet (for example after corrosion or mechanical damage) is a bit more involved, since the new part's dimensions need to match the existing frame. Below is a simplified diagram of the typical installation process from start to finish.

The most common installation mistake isn't fixing the door itself, but insufficient checking of the frame's verticality and horizontality in step 2. If the frame ends up even a few millimetres off level, the door can still be fitted, but over time it will either start swinging open under its own weight, or conversely start sticking against the frame every time it's opened. Spending a few extra minutes with a spirit level always pays off, and saves a potential complaint or a repeat visit from the installer.

Specific products with body + door + frame included

In our range you'll find several sizes of surface-mounted manifold cabinets, differing mainly in width (and therefore circuit capacity) - the door and handle are always included in the delivery, no need to buy them separately. Here's an overview of the three best-selling sizes:

Manifold cabinet 385 mm - surface-mounted - the most compact in the range, suitable for smaller flats or manifolds with fewer circuits. Both the door and handle are included in the package, and installation is simple, directly on the wall surface. Price from €63.10.

Manifold cabinet 485 mm - surface-mounted - a medium size that in practice suits most ordinary family houses with 4-6 underfloor heating circuits. Same door design as the smaller model, just with a larger area for more comfortable manifold access. Price from €67.53.

Manifold cabinet 615 mm - surface-mounted - the largest in the range, designed for more extensive manifolds with more circuits, typically in larger family houses or a combination of underfloor heating with radiators. The larger door has reinforced hinges to bear its own weight without overloading the frame. Price from €75.15.

Below is a simple price comparison of these three sizes, to make it clear at a glance how the price changes as the cabinet width increases.

As you can see, the price difference between the smallest and the largest cabinet is around €12, which needn't be the deciding factor when choosing a size - it's more important to choose a cabinet based on the actual number of circuits and a margin for the future, than to save a few euros on a smaller model that won't be enough later.

Aesthetics - how the door fits into the interior

In many households, the manifold cabinet is located right in the living area of the flat, in the hallway, or in a closet - that is, in a place where visual impression matters just as much as functionality. White painted doors are a universal choice that fits most contemporary interiors - matching white doors, door frames and light switches. If the wall is coloured or wallpapered, it's worth considering a recessed solution with the option of covering the door with the same material as the surrounding wall, so the cabinet visually "disappears".

A practical tip from installation experience: if you're not sure which type of door or colour to choose, it's better to consult before buying the cabinet, not after it's already built into the wall or the tiling is glued on - changing the installation type later (for example from recessed to surface-mounted) after the building work is finished is far more involved and expensive than making the right decision at the start.

Maintaining the door and frame over the years

The cabinet door needs almost no regular maintenance, but a few simple habits will extend its lifespan to decades. We recommend checking once a year (for example during the seasonal switch-over to winter heating) that the door still closes properly and that the lock or handle isn't loose. If squeaking appears when opening it, a drop of silicone (not oil-based, which attracts dust) lubricant spray on the hinges is usually enough.

For painted metal doors, it's worth wiping the surface from time to time with a slightly damp cloth, without aggressive cleaning agents - especially in a kitchen or boiler room, where greasy dust can settle on the surface. If the paint gets damaged (scuffing, a scratch), it's best to touch up the spot as soon as possible with a suitable primer paint, to prevent rust forming under the surface that could spread over time.

When it's time to replace the door

Replacing just the door (without replacing the whole cabinet) makes sense when the body and frame are still in good condition, but the door is mechanically damaged - for example after an impact, heavy corrosion, or irreparable deformation. In that case you need to know the exact dimensions of the original door and the hinge spacing, so the new set fits the existing frame. If you're not sure about compatibility, it's better to contact us with a photo and the dimensions of the original cabinet before ordering, to avoid an unnecessary return.

Summary - what not to forget when choosing

When choosing a cabinet with a focus on the door and frame, we recommend considering mainly these points: the installation type (surface-mounted is simpler, recessed looks more elegant but requires a frame and work on the wall), the door's material and colour relative to the surrounding interior, the type of lock depending on who needs access to the manifold, and finally the right size based on the actual number of circuits with a margin for the future. Complete sets with body, door and handle in one package significantly simplify both buying and installation, and eliminate the risk of incompatible individual parts.

Real-world experience - the situations we deal with most often

In talking with customers about manifold cabinet doors and frames, a few typical scenarios keep coming up, and they're worth mentioning because they're fairly easy to avoid. The first is when a customer orders a cabinet based on the current number of circuits with no margin for the future - for example exactly for the 4 circuits the manifold has at the time of buying the house. A few years later, during a renovation, heating gets added to a garage or extension, for example, the manifold gets an extra circuit, but the original cabinet's door and frame no longer have the capacity for it. The solution is either replacing the whole cabinet with a larger one, or fitting a second, smaller cabinet next to the original - both options are workable, but require additional work on the wall that could have been avoided with a correct estimate at the initial choice.

The second recurring scenario is buying a cabinet for a house still under construction, before the plastering is finished, when the investor doesn't yet know exactly what colour or surface finish the final wall will have. In that case we recommend choosing a universal white painted door, which can easily be repainted later, rather than deciding in advance on an unusual colour that might not match the room's final look. This tip may sound trivial, but in practice it saves the most unnecessary complaints and replacements in the first year after moving in, when the last interior details are being finalised.

The third common case is renovating an older flat, where the original cabinet is still functional, but the door looks dated or has minor corrosion after years of use. Here you need to weigh up whether it's worth investing in replacing just the door (cheaper, but tied to the exact dimensions of the original frame), or replacing the whole cabinet including the body (more expensive, but with no risk of a dimensional mismatch). In most cases, when the body is still in good condition and it's "just" about appearance, the first option pays off - the money saved can be put towards, for example, better thermostatic heads or actuators on the manifold itself.

Compatibility with other accessories in the cabinet

The door and frame aren't the only accessories added alongside the manifold and cabinet - the cabinet commonly also houses actuators, room thermostats connected to the manifold, or flow meters on the individual circuits. When choosing the cabinet size (and therefore the door), you therefore need to plan not only for the manifold itself, but also for the space needed for these additional components - especially if you're planning to fit electronic actuators, which, unlike manual valves, need a bit more room and also cable entry through the cabinet's side or top wall. In such cases we recommend choosing a size class larger (for example 485 mm instead of 385 mm), so the door doesn't press against cables or connectors when closing and cause mechanical stress on them.

Delivery, warranty and complaints about accessories

The door and frame supplied as part of a complete cabinet are covered by the same warranty period as the body itself - in case of an obvious manufacturing defect (for example poorly fitting hinges straight from the factory, or damaged paint already on unpacking), we recommend dealing with the complaint as soon as possible after receiving the goods, ideally before it's built into the wall. Once the cabinet is bricked in or tiling is glued around it, replacing the whole body is considerably more complicated, and in many cases it can only be solved by replacing the door itself, not the whole cabinet.

When ordering, we recommend always checking that the specific product is in stock in the required quantity, especially if you're planning to install several cabinets at once (for example in a multi-storey house with a manifold on every floor) - production batches can differ slightly in the shade of white paint, which can be noticeable if they're installed visibly side by side. For a larger project, it's therefore a good idea to order all the units at once from the same batch, or check in advance with our customer service.

Frequently Asked Questions

Can the door be repainted a different colour?

Yes, a painted metal door can be repainted with a suitable metal paint if you want an exact match with the wall or furniture. We recommend lightly sanding and degreasing the surface before painting, so the new layer of paint adheres well.

Is the frame included in the cabinet package, or bought separately?

For the surface-mounted cabinets in our range, the whole set (body, door, handle) is part of a single package, and a frame in the classic sense isn't used with this type. For recessed solutions, the frame is usually also part of the delivery - always check the specific package contents in the product description, or ask our customer service.

What should I do if the door doesn't close properly or squeaks?

First, use a spirit level to check whether the frame or the whole cabinet is aligned vertically and horizontally - a crooked fit is the most common cause. If the frame is fine, try tightening the hinge screws, and for squeaking, use silicone lubricant spray directly on the hinges.

Can I replace just the door without replacing the whole cabinet?

Yes, as long as the body and frame are in good technical condition. Before ordering a new door, though, you need to know the exact dimensions and hinge spacing of the original part, so the new set fits without modification. If in doubt, contact us with a photo and the dimensions.

Do I need a keyed lock, or is an ordinary handle enough?

For an ordinary household, where only the family has access to the manifold, a simple magnetic or latch handle without a key is fully sufficient. We recommend considering a keyed lock for installation in shared spaces of an apartment building, or anywhere unqualified interference by children or other people needs to be prevented.

What's the difference between the door on a surface-mounted and a recessed cabinet?

On a surface-mounted cabinet, the door is usually part of a compact unit with no separate frame, since the whole cabinet protrudes on the wall surface. On a recessed cabinet, the door is fixed to a separate frame that's flush with the wall surface and allows the door to be covered with the same material as the surrounding wall, if desired.

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.