Hi, I'm moving a radiator, and need to empty the pipework. I've locked the ballcock up in the small tank (Central heating) this feeds the coil inside the hot water tank, and no valves. First I closed all of the other radiator valves, then I emptied the pipework at each end of the old radiator. Checked the tank and it's still full. Shouldn't it have emptied? Cheers, Camerart.