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How can I add inhibitor to my sealed central heating system? Can anybody point me in the right direction please

My condensing boiler seems to have some kind of leak not associated with any water pipe.When I take the cover off, the inside has condensation at the top, near to where the pump sucks in the air.Is this a big problem/normal?It's 18 months old and doesn't seem to do it in summer, when I only heat...