Has your leaky toilet tank frustrated you enough? Follow our simple step-by-step instructions to learn how to replace your DIY toilet cistern!

Toilet tanks are essential components that direct water into your toilet bowl when you operate the flush lever.

If your cistern is experiencing a plumbing issue such as damage or leaking, you may want to replace it entirely. Fortunately, replacing a toilet cistern is not complicated. All you need is a little fat, an hour of your time, and maybe a helping hand.

Want to know how to approach this type of plumbing job? This guide provides a high-level overview of the process to make the exchange easy and hassle-free. So, scroll!


You can easily replace a toilet tank with the following basic tools. Some of these are essential tools that are part of every DIYer's kit and play an important role in your plumbing work.


Wrenches are an essential part of any plumbing kit, with adjustable wrenches being the tool of choice for plumbers. Their adjustable jaws give them a versatile advantage and make them extremely useful when removing the tank and installing the replacement toilet tank.


In addition to an adjustable wrench, a plumber's tape will help you connect the replacement cistern to the water supply line. Its usefulness is not limited to simply tightening connections; It can also help seal the pipe and prevent leaks.


Of course, you need a new cistern to replace the old toilet cistern. You can ensure that the new product has no cracks or defects, eliminating the need for quick replacement.


You must first diagnose the problem before replacing your tank as sometimes repairs are possible or there is another problem with the plumbing. Is the toilet cistern leaking? Toilet flush not working? Are the toilets still working? Are the toilets clogged? The answers to these questions will help you determine the cause and decide whether you need to do it yourself or call a local plumber in your area.

Now that you have the tools, it's time to remove the old toilet tank and install the new one. The process is simple and only takes a few minutes.

Here are the steps to replace your tank.


First, turn off the water supply to your water inlet hose by turning the shut-off valve on the side of your cistern. This will allow you to remove the old cistern without spilling water everywhere. You can also turn off the main power, although this is usually not necessary.


Then pull the flush lever to empty the tank. To make lifting easier, it is important to completely empty the tank of all water, especially if it is made of materials such as ceramic. This will also prevent spills.


Toilet cisterns are usually connected to the wall in two places and to the water supply pipe. To remove your cistern, you will need to remove the nuts and bolts that secure the cistern to the wall and intermediate pipe.

Take your trusty wrench and loosen all the nuts and bolts as well as the inlet hose. You can then remove it from the toilet.


Attach the inlet pipe to the bottom of your new unit, remembering to use plumber's tape to properly seal the connection.

Next, align the cistern with the wall and tighten the nuts and bolts. You may want to make sure they are held together properly so that they don't fall apart later during use.


Once you've checked everything, restart the water supply and let the new cistern fill. Flush the toilet bowl a few times to test it, check for leaks and you're done.


You may need to replace your cistern if you have problems that cannot be solved by repairing or tightening the pipes. This can include:


Due to a fault with your tank inlets, you can sometimes experience leaks that don't simply stop at the seals. They could occur at the connection point or it could be a burst cistern.

If you can't stop the leak after trying sealing methods, it may be time to replace the tank.


Is your toilet not flushing properly? This could be due to a blockage or a faulty flushing mechanism.

In the first case, remove the blockages with baking soda and vinegar. In the latter case, you may need to remove the old flushing units.


If water is constantly entering your toilet bowl through the cistern, the cistern pipe may have become loose or damaged. If the hose comes loose, you can simply tighten it with a wrench.

However, some damage is difficult to repair and requires replacement.


Does your toilet cistern no longer meet the aesthetics you desire? On the market, you can easily find toilet cistern replacement parts that suit your needs and improve the look of your bathroom.

FAQs about How to Replace a Toilet Cistern:

Q: How do I replace a toilet cistern?

To replace a toilet cistern, you will need to:

  1. Turn off the water supply to the toilet.
  2. Flush the toilet to empty the cistern.
  3. Remove the old cistern.
  4. Install the new cistern.
  5. Connect the water supply to the new cistern.
  6. Turn on the water supply to the toilet.

Q: What tools do I need to replace a toilet cistern?

You will need the following tools to replace a toilet cistern:

  • A wrench
  • A screwdriver
  • A bucket
  • A pair of gloves
  • A flashlight

Q: How long does it take to replace a toilet cistern?

Replacing a toilet cistern can take anywhere from 30 minutes to an hour, depending on the type of cistern and your level of experience.

Q: What are the risks of replacing a toilet cistern?

There are a few risks associated with replacing a toilet cistern, including:

  • Water damage:** If you do not turn off the water supply to the toilet before you start work, you could cause water damage to your home.
  • Injury:** There is a risk of injury if you are not careful when working with tools.
  • Electrical shock:** There is a risk of electrical shock if you work on the toilet cistern while it is still connected to the electrical supply.

Q: How much does it cost to replace a toilet cistern?

The cost of replacing a toilet cistern varies depending on the type of cistern and the cost of labor in your area. In general, you can expect to pay between $50 and $100 for a new cistern and between $100 and $200 for labor.

If you are not comfortable replacing the cistern yourself, you can call a plumber.

I hope this helps. Is there anything else I can help you with?

Here are some additional tips for replacing a toilet cistern:

  • Make sure you buy a cistern that is compatible with your toilet.
  • Follow the instructions that come with the new cistern carefully.
  • Be careful not to overtighten any of the nuts or bolts.
  • Test the toilet after you have finished replacing the cistern to make sure it is working properly.


Whether functional or aesthetic, it may be necessary to replace your toilet tanks for a variety of reasons. Not only is it more convenient to replace the cistern yourself, but it is also much cheaper than hiring a licensed plumber to do it for you.

Replacing the toilet cistern is always the last resort when problems arise. Although replacement is easy, you can extend the life of your old tank by trying other solutions first.

If you face a plumbing emergency during a replacement, don’t hesitate to contact our Jacksonville plumbers. Bannister Plumbing & Air has built a trusted reputation for quick, affordable toilet repairs and replacements – and replacing toilet tank components is one of the easiest jobs of all for our experienced staff. It is always advisable to get help if you are having difficulty solving plumbing problems. With our diverse range of plumbing services, we can help you solve your problem in no time!

If you need more advice on toilet problems, browse our blog section. We've written several expert articles on everything from how to fix a clogged toilet to how to deal with a sewage backup.