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thanks all replies I'm continue in the cc forum,

Ok thank you, thought I was in cc, I'll go back there.

Hi looking for advice to see if any one has experienced this before Just fitted 40kw Worcester cdi regular boiler with unvented cylinder, it's inlet gas pressures 12mb when on chimney service mode, Calcs done on gas run and it's more than adequate but yet still low inlet pressure when on...