Asked by: Jabir Ossete
asked in category: General Last Updated: 8th February, 2020

Why does my radiator make a knocking noise?

When steam radiators start emitting a loud knocking or banging sound, it's usually because there's condensed steam (water) trapped in the pipes. When the radiator is filled with steam, the air vent closes and the steam releases its heat to the radiator, which then radiates it into the room.

Click to see full answer.


Considering this, how do I stop my radiator pipes from knocking?

How to fix banging due to trapped air in heating pipes

  1. Turn it off the system before bleeding.
  2. Look for the small valve present under the end cap of the radiator and rotate it counterclockwise to remove the air pressure.
  3. As the air exits the pipes and the water starts to trickle out, you should close the valve.

why does my baseboard heater make a banging noise? A knocking sound from inside the baseboard heater is caused by the expansion of the pipes when hot water enters the pipe. When cold water enters the boiler to be heated and hot water flows into the baseboard and then back into the boiler, the pipe expands and creates noise.

Beside this, how do you fix a banging radiator?

Just before the steam enters the radiator, it passes a shut off valve, and an expansion relief valve. Turn off the valve to that banging radiator, remove the expansion valve, and soak it overnight in vinegar. Rinse and replace it, and turn on the steam.

Why are my pipes knocking?

In most cases, knocking pipes are caused by variable water pressure in the main supply pipes coming into your home. However, when the air used in pressurizing those pipes leaks or is depleted, water moves suddenly and violently, creating the knocking sound as it traverses the length of the supply lines.

21 Related Question Answers Found

How do you fix banging pipes?

Are noisy radiators dangerous?

Why does my heating keep banging?


Can radiators explode?

What happens if you bleed a radiator with the heating on?

Why does my central heating make a tapping noise?


How do you balance a steam radiator?

Can I turn off the radiator in my apartment?

Why does my heater make a popping noise?


Can pipes burst from water hammer?

How do I stop my wall heater from making noise?

How do I stop my electric baseboard heater from clicking?


Why is my heating system so noisy?