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Sludge in your heating system

  • Radiators cold at the bottom is first warning sign
  • Bleeding radiators black coloured water
  • Radiators not getting as hot as they used to

What causes sludge?

  • It’s when water and steel in radiators oxidize and cause a black substance

Older systems

I tend to find that its old heating systems that attract more sludge. Maybe because there is a header tank in the loft and more air gets into the system. You tend to find that with a combi ...

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