🕑 4 minutes read

Discoloured water in your central heating system

Sometimes, when you bleed your central heating system or radiator, it is often seen that the water is discolored.

Although it’s a normal thing in a fully functional heating system running all day long, worries begin when you start observing it to be browner than usual.

This discoloration means residue build-up in the central heating system that will consequently reduce central heating system functionality in the near future, leading to delayed heating up, more bills, and low overall efficiency.

Even complete dysfunction in some cases. This is why you need to do something about it. 


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Here are some of the general factors usually responsible for discolored water:

Sediment and Minerals build-up

One of the most common causes of discolored water is sediment and mineral build-up inside the heater.

It occurs as the minerals present in water cling up to the pipe walls over time, producing accumulates.

Not only does it discolor the water, but it also hinders water movement inside the central heating system, reducing its efficiency over time.

Rust and Corrosion

If you have old piping, being prone to rust and corrosion is quite obvious since they are composed of galvanized iron. This problem can be overcome by using new piping systems composed of plastic and copper.


Sometimes, the discoloration of water may be a result of iron-oxidizing bacteria that eat off the iron, leaving byproducts in the water supply that changes the watercolor. Chlorine treatment is an effective way to prevent this issue.

How to treat it?

Just in case you are coping with water discoluration issues, here are some effective ways to treat and prevent the problem:

Annual Maintenance

Annual maintenance is one of the most effective ways to keep your central heating system free of any residue and dirt build-up. In a proper annual maintenance service, the heater is flushed with some amount of cold water to clean out any existing sediment inside the tank.

It also helps to prevent any sort of mineral or rust build-up in the internal parts of CHS, consequently increasing the life expectancy of your water heater.

Although it’s a DIY job if you even have the slightest idea about the system’s functionality, you can call our experts to do the job for you on minimum charges.


Just in case you already have brown water bleeding from your radiator, it’s time to have a Powerflush as its one of the most effective ways to clean off every type of dirt from the system’s water flow pathway.

The powerflush mechanism is simple. Some strong residue and dirt-removing chemicals are being passed through the system with high pressure that dissolves any sort of dirt build-up in the system.

However, its something that requires professional help. Just in case you decide to have your system powerflushed, Service team Gas Safe engineers are available to help you 24/7, throughout London.

Make a call and we’ll be at your doorsteps within no time.

Complete Heater Replacement

Well, if your heater is 10-15 years old having symptoms like water discoloration accompanied by temperature fluctuations, and heavy dirt deposits, and banging noises, its time to make yourself ready for replacement because failure is imminent and inevitable in this case, and your heater will die anytime soon.

Therefore, you might need a complete heater replacement in that case. Call us if you feel like needing a complete replacement job. Serviceteam London offers extremely professional boiler replacement services for minimum costs.

We’ll leave you with a smile, for sure! 

Call Us Now!

If you need any type of maintenance, repair, and replacement service related to a central heating system, you can call Serviceteam straight away.

Our Gas Safe Engineers have vast experience in tasks related to parts maintenance, repair, and replacement in various kinds of heating systems. Just make a call and we will be at your doorsteps after a brief survey.