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how can i stop my ferroli optimax he 31e from losing pressure?

pressure drops by half a bar every day , resulting in topping up every other day. any suggestions on how to stop it dropping pressure please.
caren, January 2010
two possibilities, you either have a water leak , or your expansion vessel needs recharging.

Henry, January 2010
link Click here to see other fixes for Ferroli Optimax HE 31e.