Corrosion in your central heating system causes a black, mud-like, deposit called sludge. This corrosion occurs as a result of flowing water reacting with the copper and steel throughout the system.
Sludge is the no.1 cause of boiler breakdowns in the first 5 years, causing over 60% of all breakdowns in total. A little-known fact is that most boiler breakdown insurance policies do not cover you for breakdowns as a result of sludge, and subsequent large additional costs.
Sludge causes breakdowns by clinging to areas within your heating system, causing blockages and cold spots. Sludge is costing your system.
When sludge builds up in your heating system, it puts a large amount of pressure on your boiler which can lead to potentially expensive repair bills.