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  • Is the boiler a Combi?
    Green stain could be from condensate outlet.
    Insulated pipe. Gas inlet, or hot water to downstairs loo?

  • If it is the condensate outlet, as the condensed liquid is acidic, it is meant to be plumbed into your foul/effluent drain.
    The stain/growth is probably some acidophillic algae/moss/lichen amalgam.

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