Providing a space-efficient alternative to the more traditional close coupled toilet, concealed cisterns are fast becoming a popular choice for bathroom designers up and down the country.

As the name suggests, instead of being on display, the cistern element of the toilet is concealed, either behind a wall or within a furniture unit, with just the toilet pan visible. This helps contribute to a cleaner, more minimalist style bathroom that's both easy to maintain and effortlessly stylish. Some concealed cisterns are as thin as 75mm, meaning they can fit into the wall cavity of a stud partition wall, providing the perfect solution for smaller bathrooms.

So, what do you need to know about them? Click on any of the links below to jump to a section:

Size and location

Concealed cisterns are only going to be an option if you have the space. If using in a partition, check the height and depth of it carefully against the array of concealed cistern sizes available.

Remember that concealed cisterns are only viable for a back to wall pan which makes them the only real option for a back to wall or wall hung toilet. If you are looking to install a back to wall toilet with furniture unit, your concealed cistern should fit neatly inside.

Orchard Eden white slimline back to wall unit and toilet with seat

Your concealed cistern should fit neatly within your furniture unit giving you easy access should it ever require maintenance

When shopping for a wall hung toilet you should be looking for a concealed cistern that also incorporates a wall mounting frame. This frame will sit behind the wall and carry the weight of the pan as well as providing a neat housing for the cistern itself. Whatever the pan, make sure it's fully compatible with the cistern you want beforehand.

Mode Cooper wall hung toilet with soft close seat

A wall hung toilet, such as this one from the Cooper collection, looks clean and stylish, with your cistern concealed behind a partition wall

Valves and access

Concealed cisterns are valve operated, with either a cable or pneumatics. If possible, go for pneumatics as this is less likely to seize up over time and shouldn’t need to be replaced too often.

Regarding maintenance, it is vital to consider access when installing your concealed cistern. If something goes wrong will you be able to access it quickly and efficiently? Can you get to the flush pipe and can you isolate the water easily?

By using an easily removable panel (such as the flush panel on our concealed cistern & mounting frames) you can ensure access is never a problem for either emergencies or general upkeep.


Choosing a flush style might seem a stylistic choice but with a modern concealed cistern, using pneumatic valves, you'll want to go for the push-button flush. By choosing a dual flush you get the added bonus of saving water. This will (usually) give you the option of either a 3 litre or 6 litre flush. Look out for WRAS (Water Regulations Advisory Scheme) approval.

If you're really set on the traditional lever style flush then you'll need to look at older style concealed cisterns. Just bear in mind that lever flushes always require more maintenance and are less reliable than push buttons due to their cable and ball operation.

Shop concealed cisterns

We stock a large selection of high quality concealed cisterns and to make buying for your bathroom even easier, you'll find most of our wall hung toilets and back to wall toilets are also sold with concealed cisterns included.

There's wide range of big brand names to choose from, including the following:

Further help and advice

Whatever type of toilet you're after, check out our expert guides before you buy.


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