When you turn on your mixer tap and only cold water comes out, it can be frustrating. A mixer tap is supposed to blend hot and cold water, so you get the perfect temperature. When the hot water stops working, daily tasks like washing dishes or hands can become uncomfortable. If you’re not sure why your mixer tap hot water is not working, this article will help you find the cause and the solution.
What Is A Mixer Tap And How Does It Work?
A mixer tap combines hot and cold water from two pipes inside a single faucet. You can control the temperature by moving the lever or handle. Mixer taps are common in kitchens and bathrooms because they make it easy to get warm water.
They have a cartridge or valve inside that mixes the water. If something goes wrong with the hot water supply, only cold water will come out.
Reasons Why Mixer Tap Hot Water Is Not Working
There are several reasons why your mixer tap may not deliver hot water. Let’s explore the most common causes:
1. Hot Water Supply Issues
If the hot water supply is blocked or the heater is off, you won’t get hot water. Sometimes, there’s a problem with the boiler or water heater. Check if other taps in your home have hot water. If not, the issue is likely with the main hot water system.
2. Faulty Mixer Tap Cartridge
The cartridge inside the mixer tap can wear out or get blocked by debris. This can stop hot water from mixing properly. If the cartridge is faulty, you may need to replace it.
3. Airlocks In Pipes
An airlock happens when air gets trapped in the pipes, blocking hot water flow. This is more common in older homes.
4. Valve Or Isolation Switch Issues
Some mixer taps have valves that control water flow. If a valve is partially closed or faulty, hot water may not reach the tap.
5. Blocked Pipes Or Filter
Sediment or limescale can build up in pipes or filters. This can restrict hot water flow. Areas with hard water are more likely to have this problem.
6. Incorrect Installation
If the mixer tap was installed incorrectly, the hot water may not be connected properly. This is rare but can happen with DIY installations.
How To Diagnose The Problem
Before fixing, you need to find the cause. Here’s how you can diagnose your mixer tap hot water problem:
| Step | What to Check | Possible Issue |
|---|---|---|
| 1 | Test other taps | Hot water system failure |
| 2 | Check mixer tap handle | Broken cartridge or handle |
| 3 | Inspect valves under sink | Closed or faulty valve |
| 4 | Look for leaks | Pipe damage |
| 5 | Feel water pressure | Blocked pipes or filters |
If the hot water is working in other taps, the mixer tap itself is likely the problem.
Fixes For Mixer Tap Hot Water Not Working
Once you know the cause, you can try these fixes:
1. Check The Hot Water System
If no tap has hot water, check your boiler or water heater. Make sure it’s turned on and set to the right temperature. Some systems need to be reset after a power cut.
2. Clean Or Replace The Cartridge
Turn off the water supply. Remove the tap handle and unscrew the cartridge. Clean it with vinegar to remove limescale. If it’s damaged, replace it with a new cartridge.
3. Clear Airlocks In Pipes
To clear an airlock:
- Turn off the mixer tap.
- Open a tap that works well (like in the bathroom).
- Connect a hose between the working tap and the mixer tap.
- Turn on both taps for a minute. The pressure may push the air out.
- Open or Replace Valves
Check the valves under the sink. Make sure they are fully open. If a valve is broken, replace it.
5. Clean Blocked Pipes Or Filter
Remove the filter (aerator) from the mixer tap. Clean it under running water. If your area has hard water, clean pipes regularly to avoid blockages.
6. Check Installation
If you just installed the tap and hot water never worked, check the connections. The hot pipe must connect to the hot side of the mixer tap.
Common Mistakes When Fixing Mixer Tap Hot Water
Many people make simple mistakes when trying to fix their mixer tap:
- Forgetting to turn off the water supply before removing the tap.
- Not checking if hot water works in other taps first.
- Using the wrong cartridge type when replacing.
- Ignoring signs of limescale, which builds up slowly and causes blockages.
Mixer Tap Cartridge Types And Performance
Different mixer tap cartridges have different performance. Here is a quick comparison:
| Cartridge Type | Durability | Cost | Ease of Replacement |
|---|---|---|---|
| Ceramic | High | Medium | Easy |
| Plastic | Low | Low | Easy |
| Metal | Very High | High | Medium |
Ceramic cartridges last longer and are less likely to block with limescale. Metal cartridges are durable but more expensive.
Credit: dokasch.com
When To Call A Plumber
If you try these steps and still have no hot water, it’s best to call a professional plumber. Some issues need special tools or skills. If your boiler is not working, or you see leaks, don’t try to fix it yourself.
Practical Tips To Avoid Mixer Tap Hot Water Problems
- Clean the cartridge and filter every 6 months.
- Use water softeners if your area has hard water.
- Don’t force the mixer tap handle if it’s stuck.
- Check for leaks under the sink regularly.
Many people overlook the importance of regular maintenance. Catching small issues early can prevent expensive repairs.
Credit: naturaconnect.eu
Statistics On Mixer Tap Hot Water Failures
According to plumbing experts, about 30% of mixer tap failures are due to blocked cartridges. 20% are caused by hot water system issues. The rest are due to installation errors or airlocks. These numbers show that regular cleaning and checking the water heater can prevent most problems.
For more information about plumbing systems and troubleshooting, visit PlumbingSupply.com.
Frequently Asked Questions
Why Does Only Cold Water Come Out Of My Mixer Tap?
This usually happens if the hot water supply is blocked or the cartridge inside the tap is faulty. Check if other taps have hot water to find the cause.
How Do I Know If My Mixer Tap Cartridge Needs Replacement?
If the handle is loose, or you get uneven water temperature, the cartridge may be worn out. Remove and inspect it for damage or buildup.
Can Airlocks Stop Hot Water In Mixer Taps?
Yes, airlocks can block hot water. Try flushing the pipes as described above to clear the air.
Is It Safe To Fix A Mixer Tap Myself?
It’s safe for simple fixes like cleaning the cartridge or filter. If you see leaks or problems with the boiler, call a plumber for help.
How Often Should I Clean My Mixer Tap Cartridge?
Clean the cartridge and filter every 6 months, especially if you have hard water. Regular maintenance prevents blockages and ensures smooth operation.
Solving mixer tap hot water problems is usually simple once you know the cause. With regular care and quick action, your tap will work perfectly for years.
Credit: www.sevgastro.com
Dorothy Addeo is a senior product reviewer at Safefins.com with years of experience testing kitchen, furniture, backpacks, and everyday lifestyle products. She focuses on comfort, durability, usability, and long-term value through hands-on research and real-world testing. Her goal is to help readers find reliable products with honest, easy-to-understand recommendations they can trust.