Why Does My Central Heating Need a Powerflush or Descale?
Rust occurs in all central heating systems producing a black (iron oxide) sludge and, in hard water areas, lime scale builds up in combination boilers just like in your kettle causing the following problems:
Radiators cold at bottom due to black sludge. |
Radiators cold all over due to blocked valves and pipes. |
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Radiators cold at top and need bleeding due to gases, a by product of rusting. |
![]() Boiler cutting out and no circulation due to blocked pump. |
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![]() Little or no hot water due to blocked pipes and heat exchangers. |
![]() Irritating boiler noise from sludge or lime scale build up, a warning sign of imminent costly problems. |





