Diverter Valve on a Combi Boiler Everything You Need to Know
A combi boiler is a popular option for many homes. It offers both heating and hot water. Plus, it does not need a separate water tank. In this blog, we’ll dive into what the diverter valve does, where you can find it, how to fix it if it’s stuck, and the cost of replacing it.
What is a Diverter Valve?
The diverter valve in a combi boiler is an essential part of the system that controls the flow of water. It directs hot water either to the radiators for heating your home or to your taps and showers for hot water. When you turn on the hot water tap, the valve switches to send water to the taps. When the tap is off, the valve sends hot water to the heating system.
In short, the diverter valve is like a traffic controller, deciding whether the hot water should go to the central heating or your taps. It just opens and close to alter the hot water flow.
Where is the Diverter Valve in a Combi Boiler?
You can usually find the diverter valve inside the combi boiler. While it varies slightly depending on the model, you will generally find it near the boiler’s pump and heat exchanger. You cannot easily access it without opening the boiler casing.
If you are unsure or lack confidence, consult your boiler’s manual. You can also contact a professional for help.
What Does a Diverter Valve Do?
Lets see how diverter valve works. The combi boiler diverter valve helps the boiler switch between hot water for heating and hot water for taps. For example, if you’re running a hot shower, the valve sends the hot water to the taps. Once the tap is off, the boiler can focus on heating the radiators again.
Diverter valve cartridge plays important role inside the valve. It moves inside the valve to change the hot water flow.
If the valve is working well, you won’t even notice it. It smoothly switches flow of hot water between heating your home and giving you hot water. However, if the diverter valve for the boiler is faulty, you might experience problems like:
- Hot water not working when taps are turned on
- Radiators not working
- Water taking a long time to heat
Does a system boiler have a diverter valve?
No, a system boiler does not have a diverter valve. Unlike combi boilers, system boilers use other parts, like motorized valves, to control water flow. These valves direct water to different parts of the heating system, like the hot water cylinder. This helps supply hot water.
What is Diverter valve cartridge?
A diverter valve cartridge is a crucial part inside the diverter valve of a combi boiler. It controls how water moves. This lets the system switch between heating water for your taps or your radiators. The cartridge moves back and forth to direct the water flow as needed.
Over time, the cartridge can become worn or stuck, causing issues with your boiler’s ability to switch between heating and hot water. In many cases, changing the diverter valve cartridge can fix issues with hot water or heating. You can do this without replacing the whole unit.
How to Fix a Diverter Valve?
Over time, the diverter valve in a combi boiler can become stuck because of wear and tear or debris buildup. This can lead to problems like inconsistent heating or no hot water at all. Here’s how you can try to fix a stuck diverter valve.
Time needed: 20 minutes
Steps to follow check Diverter valve
- Turn off the boiler
For safety, always start by turning off the boiler and allowing it to cool down.
- Check for blockages
Debris or sludge in the system can cause the valve to get stuck. Clean out the system or call a professional to flush it.
- Try to manually move the valve
In some cases, you might be able to manually move the valve back into position. However, you should only do this if you feel comfortable working with boiler components. If not, it’s better to call a heating engineer.
- Replace worn parts
If the valve is sticking because of wear and tear, you might need to replace certain parts of the valve. This is a job for a professional engineer.
If your combi boiler diverter valve is still not working after these steps, it may need replacing.
Diverter Valve Replacement Cost
If the valve for your combi boiler is beyond repair, you’ll need to replace it. The cost to replace a diverter valve can change based on the boiler model and if you hire a pro.
- Parts cost: The price of a new diverter valve can range from £80 to £200 depending on the make and model of your boiler. But you can get a refurbished diverter valve costs you half of new one.
- Labour cost: Hiring a qualified Gas safe register engineer to replace the valve will increase labor costs. These costs can range from £100 to £250, depending on where you are.
On average, you’re looking at a total cost of £180 to £450 for replacing a diverter valve in a combi boiler.
How to Know If You Need to Replace the Valve
Some common symptoms and signs that indicate you might need to replace your combi boiler diverter valve:
- Hot water is only available when the heating side is on.
- Central heating system is not working, even though the boiler is running.
- The boiler makes strange noises when you try to get hot water.
- You’ve tried fixing the valve, but it still isn’t working properly.
If you notice any of these issues, it’s likely sign of a faulty diverter valve. Now it is time to call in a professional to inspect your Boiler.
Conclusion
The diverter valve in a combi boiler is an important part. It helps your heating and hot water system work well. It switches hot water between your taps and radiators, ensuring you have heat and hot water supply when you need it. If hot water not flowing accordingly, you can conclude diverter valve is faulty.
If your valve gets stuck or stops working, you can try a few fixes like checking for blockages or moving the valve manually. However, if it needs replacing, it’s worth calling a professional for the job.
