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Ok, so my drain cock was just partially open. I opened it completely. I'll check tomorrow morning and then update , Thanks boss

Hi, I am new to this Forum and completely new ! - Hello to all We completed a small refurbishment recently and : Converted to unvented system (Flow rate 22 lts/m & 5bar - this does not matter as the out reduces cold water pressure to 3.5 bar) - (we have a Ideal Classic FF 360, which...