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.