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Tony Thanks for the reply. Would this small leak cause a pressure drop on the system or would there be more chance of it being elsewhere on the system?

Hi there I got a Vaillant ecotec pro28 gas combi boiler installed almost 11 months ago. Recently I have had to allow water into the heating system due to the pressure dropping. I realise this could be a leak somewhere so I started from the boiler as I can't see any dampness/signs of a leak in...