Can anybody help here-We run a wood burning stove with a back boiler for hot water. After being on for half an hour we get a loud knocking and have to turn it down. Is this air in the back boiler- and how does it stay their- cold feed at bottom/hot at top. Can I cure this- chemicals added to feeder tank? or some sort of air outlet value????
22mm pipe I think > Any Advise appreciated.- posted
16 years ago