Omar Khalid
A leaking toilet cistern can be a real headache, but the good news is that replacing it is a relatively straightforward DIY job. You'll need some basic plumbing tools, such as wrenches and plumber's tape, and a little know-how. Before you start, it's important to diagnose the problem and check that it's definitely the cistern that needs replacing. If you're unsure, it's best to call a professional. However, if you're feeling confident, make sure you choose a compatible cistern and follow the steps carefully to avoid costly mistakes. First, turn off the water supply and empty the cistern. Then, disconnect the water inlet pipe and remove the nuts and bolts securing the cistern to the wall and toilet bowl. Lift out the old cistern and install the new one, ensuring everything is securely tightened. Reconnect the water supply, fill up the cistern, and test it by flushing several times to check for leaks.
Characteristics and Values Table for Replacing a Plastic Toilet Cistern
| Characteristics | Values |
|---|---|
| Difficulty Level | Relatively easy for beginners with basic tools, but not recommended for everyone |
| When to Replace | If the cistern is leaking, not flushing, constantly running, or blocked |
| When to Call a Plumber | If there's another plumbing issue, or you're unsure and want to avoid costly mistakes |
| Tools Required | Adjustable wrench, plumber's tape, sponge, bucket, towels, spirit level |
| Steps | Turn off water supply, empty cistern, remove nuts and bolts, disconnect inlet pipe, install new cistern, check for leaks, restart water supply |
| Cost | Varies depending on model, labour, and additional work, typically £50-£200+ |
| Time Taken | 1 hour or less |
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What You'll Learn
Turn off the water supply
Before starting work on replacing your plastic toilet cistern, it is important to turn off the water supply. This will prevent water from spilling everywhere when you remove the old cistern.
First, locate the stop tap on the side of your cistern and turn it to the off position. This will cut off the water supply to your water inlet hose. If you cannot find the stop tap, or if it is inaccessible, you can shut off the main water supply instead. This is usually located at your mains water supply. Remember to warn other members of your household if you are turning off the water supply at the mains.
Once you have turned off the water supply, flush the toilet to empty the cistern. You may need to use a sponge, cloth, or bucket to remove any remaining water from the cistern. It is important to ensure that the cistern is completely empty before proceeding with the replacement.
Now that the water supply is turned off and the cistern is empty, you can safely remove the old cistern and begin installing the new one.
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Remove the old cistern
Before you start, make sure you have the right replacement cistern for your toilet. Check that it is the correct size and specification, and that it is compatible with your existing toilet bowl and bathroom layout. Aesthetics matter, so get a cistern that you like the look of, as well as one that is suitable for your setup.
Now, turn off the water supply at the mains and at the valve behind or next to the toilet. You can also opt to just shut off the stop tap on the side of the cistern, but this is generally not needed. Flush the toilet to get the water out of the cistern and use a sponge or cloth to get rid of any water left inside.
Next, disconnect the water inlet pipe at the base of the cistern. Use an adjustable wrench to unscrew the nuts and bolts holding the cistern to the wall and the inner pipe, and to the toilet bowl. Gently lift the cistern from the toilet bowl and set it aside.
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Prepare the new cistern
Before installing a new cistern, ensure that it is the correct size and specification for your toilet. Check that it is compatible with your existing toilet bowl and bathroom layout. Aesthetics also matter, so choose a cistern that you like the look of. It should be free of any cracks or blemishes to ensure that you won't need to replace it again soon.
Once you have the correct cistern, read the manufacturer's instructions. Check that the new cistern and the top of the toilet bowl line up with the mounting holes so you can screw it in. Be careful not to over-tighten, as this can damage the cistern or crack the porcelain.
Wrap the threads of the inlet valve with Teflon plumber's tape to create a tight and permanent seal. This will also help to lubricate the connection. Then, reconnect the water supply line to the bottom of the cistern with an adjustable wrench, again being careful not to over-tighten.
Turn the water supply back on and listen for the sound of the cistern filling up. Check for leaks while it is filling and, once the tank is full, do a test flush. If everything is working, add a bead of sealant around the base of the cistern to ensure it is watertight.
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Install the new cistern
Installing a new cistern is a simple process. Before you begin, ensure that the new cistern is the correct size and specification for your toilet. Check the compatibility of the cistern with your existing toilet bowl and bathroom layout. Factors such as base shape, water inlet location, and discharge outlet size play a role in their fit.
Once you have the correct cistern, turn off the water supply at the mains and the valve behind or next to the toilet. Flush the toilet to get the water out of the cistern and use a sponge or cloth to remove any remaining water.
Disconnect the water inlet pipe at the bottom of the toilet cistern. Unscrew the nuts and bolts holding the cistern to the toilet bowl and gently lift the cistern away.
Now, take your new cistern and line it up with the mounting holes on the toilet bowl. Screw the cistern in, being careful not to over-tighten as this can damage the cistern or crack the porcelain. Wrap the threads of the inlet valve with Teflon plumber's tape to create a tight and permanent seal.
Reconnect the water supply line to the bottom of the cistern with an adjustable wrench, again being careful not to over-tighten. Turn the water supply back on and check for leaks as the cistern fills. Once the cistern is full, do a test flush. If everything is working, add a bead of sealant around the base of the cistern to ensure it is watertight.
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Test for leaks
Before installing a new cistern, it is important to identify the source of the leak. A leaking cistern will usually result in water running into the bowl, whereas a leaking toilet will cause water to pool on the floor.
To test for leaks in the cistern, you can add a few drops of food colouring or non-toxic dye to the water and wait to see if any colour seeps into the bowl. Alternatively, you can use a stethoscope or a rubber hose against the cistern wall to listen for dripping sounds. An infrared camera can also be used to detect temperature variations, which may indicate leaks. If the leak is severe or coming from multiple places, the entire cistern may need to be replaced by a professional.
If the leak is coming from the seal between the cistern and the bowl, the cistern will need to be removed to replace the seal. This can be a tricky job, so it is recommended to consult a plumber.
Once the new cistern has been installed, turn on the water supply valve and check for leaks as the tank fills up. Make sure that the connections between the cistern, the bowl, and the water inlet hose are secure and sealed.
If you are unsure about any part of the process or are unable to identify the source of the leak, it is always best to seek the assistance of a licensed plumber.
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Frequently asked questions
If your toilet cistern is leaking, not flushing, constantly running, or blocked, it may be time to replace it. Before replacing your cistern, diagnose the problem to ensure there isn't another plumbing issue that can be solved with repairs or by tightening the pipes.
You will need a wrench, pliers, a new cistern, and possibly new bolts and a washer. You should also have a sponge, bucket, and towels to hand to mop up any spills.
First, turn off the water supply at the mains and the valve behind or next to the toilet. Flush the toilet to empty the cistern and remove any remaining water with a sponge or cloth. Disconnect the water inlet pipe at the bottom of the cistern and remove the bolts holding the cistern to the wall and toilet bowl. Lift the cistern away from the wall and toilet bowl. Install the new cistern, ensuring it is compatible with your existing toilet bowl and bathroom layout, and reconnect the water supply line to the bottom of the cistern. Turn the water supply back on and check for leaks.
