I am going away shortly for a week and I always shut off the stop cock in case of overflow probelm. This time I also want to empty the loft header tank and empty all the pipes to avoid a disaster if the pipes freeze up. Am I right in saying that after I shut the stop cock I open the hot water tap and let it drain the tank? If not, what is the correct procedure to ensure there is no water left in the header tank. Thank you.