ugh I have a small damp patch under my indirect hot water cylinder , ,I cant see any leaks on any of the joints so am assuming there might be a swall weep hole in the tank? so while not botherd by the doing of , a bit puzzeld by A draining down and refilling heating system and cold supply , any help...
wow this sounds fun , iam a carpenter but have been doing a lot of swating for plumbing , (dont claim to be a plummer) but ,,,could that be a heat exchande unit ?