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Thanks Kevplumb and MANDATE - I was going to try the bag around the outlet last night but thought better of it with the weather warnings, so I'll try again tonight. Great post - I'll let you know how I get on!

Hi all, I'm looking for a bit of advice - we had the Ravenheat CSI 120T Low Nox Combi installed about 12months ago. Initially all was fine and we got to the summer having to top up the pressure a couple of times but didnt think much about it. After the long hot summer (OK maybe not!) we are...