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0.5 bar? odd. That suggests it's actually operating under vacuum, surely, since 1 bar is atmospheric pressure at sea level? I don't know anything about your boiler, but I know mine is set at 1.5 bar (potterton). Velvet

Hi there. I'm hoping someone might be able to help me out with this. I have a potterton combi boiler, replacement for an old ocean combi. Sealed system. The rads were never balanced when I moved in, I did it by feel years back after asking the boiler blokes who do the safety check each year...