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How do I raise the pressure of my boiler?

How do I raise the pressure on my Halstead ace boiler and how high should it be? It is at 1 and a half at the moment
helen Burgess, October 2009
1 1/2 bar is fine.....why would you want it higher? Are there circulation problems?

John, October 2009
link Click here to see other fixes for Halstead Ace.