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The cistern is one of the core components of the toilet since it is basically the water tank which holds water for the flush.

It is constructed with a few parts which work together to regulate the flow of water inside the toilet.

When we flush the toilet, water is released in the toilet pan which rinses it and carries the waste into the sewer.

In the majority of today’s toilets, the bathroom cistern is mounted above the toilet bowl.

You can find cisterns and accessories in TOYO’s sanitaryware collection.

Different Parts Of A Toilet Cistern

Inlet and outlet valves

These valves are located inside the cistern and their primary function is to regulate the flow of water during flushing.

The outlet valve is responsible for releasing water from the cistern tank into the toilet bowl once the flush is pressed.

The inlet valve is responsible for refilling the cistern with water after flushing.

Flush Lever

The flush lever is responsible for releasing water when it is pressed or pulled.

Upon activation, it releases water from the cistern into the toilet bowl.

Many flush levers are sold with chains which attach to the inside of the external flushing mechanism. 

The chain which is used to attach the lever to the flapper prevents the flow of water from the tank to the toilet bowl.


The flapper is a rubber stopper which is located at the bottom of the toilet.

It is controlled by the flush lever and releases water into the toilet bowl. Once the water has been released, it falls back in place to block the hole at the bottom of the tank.

If the flapper loses its seal or starts to crack, water will start leaking from the toilet.

Overflow tube

The overflow tube is a vertical tube inside the toilet tank which prevents water from overflowing by directing extra water to the bowl.

This makes it easy to repair structural defaults and refill the cistern once the fault is repaired.

Types Of Toilet Cisterns

Concealed Cisterns

A concealed cistern is hidden behind the wall of your bathroom or within a cabinet and only the flush plate is visible.

This contributes to a cleaner and more refined look which is ideal for minimalist styles.


  • Concealed cisterns are great save spacers for small bathrooms and helps them look more open.
  • Gives an attractive and aesthetic appearance which complement the majority of today’s modern bathrooms.
  • You get flexibility in choosing a certain flush plate which complements your bathroom’s interior.
  • Concealed cisterns make cleaning a whole lot easier. You don’t have to deal with the hassle of cleaning around the cistern which kind of acts as an obstacle.
  • A concealed cistern gives you the freedom to adjust the height of your toilet pan. This is a huge advantage especially since some individuals have particular height requirements.
  • It is very durable due to state-of-the-art technology.
  • Less noise is generated since the cistern is concealed in the wall.
  • Its flush valve technology enables you to save water.
  • Available in very slim options to fit into thin wall partitions.

How To Access A Concealed Cistern

  • First you will need to locate the push button of the cistern.
  • Remove the cover plate, disconnect the air hoses and remove the flushing rods which are located at the centre to release the cistern frame.
  • Turn the isolation valve and discharge the water which is present if you want to do any maintenance work.
  • At the back of the float valve, you will find a lever. Push it along with the lever on the back of the siphon unit.
  • For the final step, take the siphon out of the cistern.

Toilets Used With Concealed Cisterns

Wall Mounted Toilets

Wall mounted toilets are toilets in which the toilet bowl is mounted directly to the wall. They are not supported by any pedestals underneath them.

They are ideal for compact bathrooms since they take up less space compared to other toilets.

Back to Wall Toilets

Back to wall toilets sit against the wall and have a small pedestal at the bottom.

They are the perfect blend of traditional and modern toilet designs.

Exposed Cisterns

Standard toilets use exposed cisterns where the tank is placed at the back of the toilet bowl.

It is visible and rests against the wall. 


  • Exposed cisterns are available in a variety of shapes, designs, sizes and colours. Because of this you can choose one according to the look you want to achieve in your bathroom.
  • They are affordable which is why they are used in a large percentage of homes. The cistern price won’t break the bank. TOYO’s toilet cistern price is very reasonable for the quality you get.
  • Easy to replace parts and make repairs if necessary. In cases of interruption of the main water supply in your home, an exposed cistern can be manually refilled.
  • Easily accessible for routine maintenance.