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I can't see any bleed valve's on the system at all, only the drain valve at the lowest part near the burner. :(

Hi, I have recently installed a new hot water cylinder and connected it to an existing gravity fed Indirect heating system. This comprises of a small header tank in the loft and a gas burner on the ground floor, with a drain valve next to it. There is some kind of thermocouple/thermostat that...