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It is common to hear water noises coming from a radiator when it comes time to turn on the heat again. This noise requires to find the cause, in order to put in place adapted solutions to remedy it.

Noise of water in a radiator: what does this mean?

Noise of water in a radiator: what does this mean?

The water noise from your radiators can be caused by air bubbles

The water noises in radiators are common, and most of the time, they are due to the presence of air bubbles in the radiator. These air bubbles block the circulation of hot water in your radiator, and you can see if the top of your radiator is hotter than the rest of the radiator.
Thus, it is important that you purge your radiators, not only those with water noise, but more generally all of your radiators, once a year.
To do this, you must follow a few steps:

  • Have a container that can collect water from your radiator, a flathead screwdriver, a pliers or a wrench suitable for bleed screw of your radiator, and a rag;
  • Turn off your boiler completely.
  • Start with the radiator closest to the boiler to the farthest.
  • Open the bleed screw located opposite the radiator valve as far as possible.
  • Collect the water flowing into the container and wait for the air to come out.
  • Wait a few minutes and then turn on the boiler and readjust the pressure: it should turn around 1 to 1.5 bar.

The water noise from your radiator can be caused by slurring

If the water noise from your radiator persists despite purging, the heating circuit may have become stuck with time. You can also suspect that if you purged your radiator, you found that the water was greyish or brown. To disembowel your heating circuit, you have the possibility to call on your heating engineer, or to perform the de-watering yourself. For this, several techniques are available to you:

  • You can inject a defatting product which will deoxidize the circuit.
  • You also have the possibility to inject air at high pressure who will remove the mud and clean the network.
  • You can also choose to inject a product that will inhibit corrosion and stabilize the pH.

After having chosen your de-watering method and once the heating circuit has been de-watered, you may consider installing a device to prevent sludging and to prevent the boiler, heat exchanger or any other specific element from becoming dirty..

Learn more about the failures of a radiator.

Video Instruction: Why is my radiator making a bubbling / gurgling noise? - 24|7 Home Rescue