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My expansion tank rubber diaphragm has had it and I am unable to continue putting air into the air side with a footpump as now the pressure drops every few hours. I have a small drip from the heat exchanger on the seam which I think has been there for a long time. Also I was bleeding the...

I found this excellent html file for an easy explanation of how a boiler works. http://www.makewrite.demon.co.uk/SealedCH.html I hope this helps the novice as it did me.