Thinking about installing a dishwasher? Whether you're replacing an old unit or fitting one for the first time, this guide walks you through the process step-by-step. No jargon, no stress - just practical advice to help you get the job done safely and confidently.
Disconnecting your old dishwasher
Before you bring in the new, you’ll need to say goodbye to the old. Here’s how to safely disconnect your existing dishwasher.
Step 1: Disconnect power and water/waste
Start by unplugging your dishwasher. Then, locate and disconnect the water and waste connections. These are usually found under the kitchen sink if the dishwasher is nearby, or directly behind the unit.
If you can’t access the connections yet, skip ahead to Step 4, then return here once the dishwasher has been moved and access is easier.
Step 2: Remove the waste pipe
Once the water connections are detached, you can disconnect the waste pipe. Support the pipework as you pull—it may be tight and tricky to loosen. Look out for any clamps or fasteners that need to be removed first.
Step 3: Turn off the water supply
Locate the water supply tap - typically blue - and turn it 90° so it’s perpendicular to the pipe. This shuts off the water.
Loosen the pipe slowly. A small amount of water may escape, which is normal. If water continues to flow, the supply hasn’t been turned off properly.
You can discard the old water hose, as your new dishwasher will come with a replacement.
Step 4: Move the dishwasher
Carefully pull the dishwasher out to access the rear connections. Be gentle when removing any remaining pipes - they may be tightly fitted.
It’s normal for a bit of water to leak during this step, so keep a towel or bucket nearby to catch any drips. Once everything is disconnected, clean the area and remove any excess water.
You’re now ready to install your new dishwasher….
Installing your new dishwasher
We’ll guide you through the installation process step by step. Be sure to refer to your dishwasher’s manual to follow any specific instructions from the manufacturer.
Step 1: Unpack everything
Start by carefully removing all packaging materials. Begin with the outer wrapping, then take off any polystyrene around the machine. Check underneath - many models include a polystyrene base. You can either lift the dishwasher off the base or tilt it backwards and slide it out. If lifting, ask for help—dishwashers are heavy and awkward to move alone.
Once unpacked, dispose of the packaging. It’s only there to protect the appliance during transport. Open the dishwasher door and check inside. You should find a cold water inlet hose (unless pre-installed), a waste hose, adjustable feet, the instruction manual and any additional fittings or accessories.
Step 2: Install the inlet hose
Before connecting the hose, check that both ends have rubber seals. Most hoses have one angled end and one straight end. Connect the angled end to the back of the dishwasher and the straight end to the cold water supply.
Start tightening by hand, then use pliers to give it a gentle quarter turn. Avoid over-tightening - it can damage the fittings. If your dishwasher has a pre-installed hose, connect it to the water supply in the same way.
NB: Some hoses are slightly larger than standard, so you may need to widen the hole in your cupboard to fit it through.
Step 3: Level and align the dishwasher
A level dishwasher is essential for proper drainage and leak prevention. Use a spanner to adjust the feet until the unit sits flat. Check alignment with a spirit level - both side-to-side and front-to-back.
Finally, make sure the door lines up neatly with your kitchen cupboards for a clean, professional finish
Connecting the water and waste supplies
Most dishwashers have similar waste and electrical connections. Here’s how to get everything set up.
Step 1: Connect the water supply
Locate your water connection. A blue tap usually indicates a cold water supply, while a red tap means it’s hot. Most dishwashers are designed to connect only to cold water, so check your manufacturer’s instructions to confirm.
Before disconnecting the existing hose, make sure the tap is in the OFF position.
Attach the new hose by hand first, then gently tighten with pliers—just a quarter turn is enough. Avoid over-tightening, as this can damage the fittings.
Once the hose is connected, turn the tap back on and inspect both ends of the pipe for any leaks.
Step 2: Connect the waste pipe
Next, attach the waste hose. If you’re connecting to a standpipe, insert the hose about halfway in and secure it using the horseshoe-shaped clip provided.
If you’re connecting to a spigot (usually found on the sink plumbing), check for any caps or plugs that may need to be removed first.
Push the hose firmly onto the spigot. If your dishwasher came with a clamp, use it to secure the hose in place.
Completing your installation
Slide the dishwasher into its final position, making sure the hoses aren’t kinked or trapped. Double-check that the unit is still level and that the door opens and closes freely.
Testing your dishwasher after installation
Run a short or rinse cycle to check everything’s working:
Listen for water filling and draining.
Inspect around the hoses and base for leaks.
Make sure the door locks properly and stays shut during the cycle.
If you’re unsure whether your dishwasher is installed correctly, this test will give you peace of mind.
When to call a professional installer
DIY is great - but some jobs are best left to the pros. You should call an expert if:
You’re dealing with gas or electrical connections
Your dishwasher needs to be fitted into custom cabinetry
You want to protect your warranty
Final tips
Keep your manual handy: Every model is slightly different.
Use the right tools: Adjustable spanner, screwdriver, spirit level, and a bucket are your best friends.
Need more help? Visit Currys TechTalk for more kitchen appliance advice.
FAQs
How to install a dishwasher in the UK
Start by disconnecting your old unit, then follow the steps to connect water and waste hoses, level the appliance, and test it. This guide is tailored for UK homes, so it covers standard plumbing and electrical setups.
How to plumb in a dishwasher
You’ll need to connect the inlet hose to a cold water supply and the waste hose to your sink’s drainage system. Use clips or seals to prevent leaks and always check for water flow before finishing.
How to connect dishwasher to water supply
Attach the inlet hose to the cold water tap using a threaded connector. Make sure it’s tight but not over-tightened. Turn the water on and check for drips or leaks.
What’s next?
For more tips and tricks, check out our Dishwasher buying guide. Don't forget to take care of your new dishwasher to maintain the best results - so check out these tips on how to keep your dishwasher clean.
