I have removed the existing hot water heater. With the cold pipe reconnected, and the hot out pipe still disconnected, I used the cold water in the house temporarily. Every time I turned the cold water faucet on, water came flowing out of the disconnected hot water pipe. If I disconnected the hot water pipe from the hot water heater, why does water come out of it only when I turn the cold water on in the sink? If cold water is somehow connected to the hot water line somewhere else in the house, how do I find it?