What is the difference between mechanical and pneumatic concealed cisterns, and which should you choose?

Mechanical cisterns use a direct linkage from the push plate to the flush mechanism, so they are simple, robust and often the most cost effective. Pneumatic cisterns use an air tube so the push plate can be mounted a little further from the mechanism, which gives you more flexibility in plate position and can feel slightly softer to operate. If you want a straightforward, long‑lasting option for a standard wall, a mechanical ProSys unit is a sensible choice; pick pneumatic if you need greater freedom of plate location or a gentler button action.

How do I decide between the 120mm and 150mm depth cisterns?

The 120mm depth cistern is designed for slimmer walls or tight service voids where space is limited, while the 150mm depth is the more common size for standard stud or masonry cavities and gives a bit more room for servicing. if you're fitting into a shallow partition behind a back‑to‑wall pan choose the 120mm; if you have a typical stud wall or want easier access and slightly more component clearance go for 150mm.

What's the difference between front and top actuation and when would you use each?

Front actuation places the push plate on the wall directly in front of the pan, which is the usual solution for exposed tiled walls and simple layouts. Top actuation lets you fit a button or plate on the vanity top or furniture surface above the cistern, useful when the cistern is boxed in or you prefer a worktop control. If you change your mind later, there's a ProSys top actuation kit available to convert front to top operation.

Will a concealed cistern work with a wall-hung or back-to-wall toilet, and how does it change the look and space?

Yes, concealed cisterns are ideal for both wall‑hung and furniture‑screened back‑to‑wall toilets because they hide the cistern so you get a cleaner aesthetic and save floor area. With a wall‑hung pan and a concealed ProSys cistern recessed into the stud wall you'll gain visible floor clearance and an uncluttered bathroom front, while a back‑to‑wall pan looks neat when the cistern is boxed into a vanity unit.

How easy are these cisterns to maintain, and can I change the actuation later?

These Ideal Standard ProSys cisterns are designed to be easy to maintain; the flush mechanism is accessible through the actuator opening so routine servicing is straightforward. If you decide to change how you operate the flush, you can retrofit actuation parts such as the ProSys top actuation kit rather than replacing the whole cistern.

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Next day delivery available!

365-Day Returns

Returns made easy

Lowest Price Guaranteed

Big brands. Small prices

Rated Excellent

73,783 satisfied customers

Ideal Standard Concealed Cisterns

Ideal Standard concealed cisterns deliver a neat, aesthetically pleasing look to any bathroom by tidily hiding the cistern behind the wall - and these are fantastically engineered cisterns too, build to last for a lifetime all the while giving you efficient, reliable flushing capability. These hidden toilet cisterns will save you space and they're easy to install and maintain, so you're sure to be happy with your choice.

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Ideal Standard Concealed Cisterns

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Ideal Standard ProSys Top Actuation Kit – 150mm – Front to Top Actuation

Ideal Standard ProSys Concealed Cistern – Mechanical, Front Actuation 120mm Depth

Ideal Standard ProSys Concealed Cistern - Mechanical, Front or Top Actuation 150mm Depth

Ideal Standard ProSys Concealed Cistern – Mechanical, 150mm Depth

Ideal Standard ProSys Concealed Cistern – Pneumatic, Front or Top Actuation 150mm Depth

Ideal Standard ProSys Concealed Cistern – Pneumatic, Front Actuation 120mm Depth

Ideal Standard ProSys Concealed Cistern – Pneumatic, 150mm Depth

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Ideal Standard ProSys Top Actuation Kit – 150mm – Front to Top Actuation

Ideal Standard ProSys Concealed Cistern – Mechanical, Front Actuation 120mm Depth

Ideal Standard ProSys Concealed Cistern - Mechanical, Front or Top Actuation 150mm Depth

Ideal Standard ProSys Concealed Cistern – Mechanical, 150mm Depth

Ideal Standard ProSys Concealed Cistern – Pneumatic, Front or Top Actuation 150mm Depth

Ideal Standard ProSys Concealed Cistern – Pneumatic, Front Actuation 120mm Depth

Ideal Standard ProSys Concealed Cistern – Pneumatic, 150mm Depth

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