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how do I change the bar pressure on my boiler? It's a ferolli Optimax 25C?

the bar pressure is sitting between 0 and 1. how do I adjust this?
Chris, October 2014
There will be a filling loop in the form of a chrome flexible pipe usually near the boiler

toptrish, October 2014
link Click here to see other fixes for Ferroli Optimax 25C.