What causes knocking noises in boilers?
Boiler noises result from localised boiling of the water. This happens when the inside surface of the boiler becomes too hot due to scale or baked on sludge deposits. All systems over five years can suffer noise and new boilers in old systems are especially vulnerable. We recommend you clean the boiler and system with one from the range of Fernox Cleaners, or add a Fernox Express or Superconcentrate Boiler Noise Silencer f2 product to the system as an interim measure.
