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I was watching few videos . Can't understand how this differential pressure achieved . Like alpha c35c .two pipes connecting to combustion chamber and other joint connecting to gas valve . To thanks

no hot water pls help? heating ok .no hot water come and very little water flows from hot tap .2 days ago no hot water but i turn it to heating has hot water but flow smaller than before ..all cold tap running fine all hot dead and barely water comes out of hot tap ..heating ok .....