Abstract: A multiple well header system includes an upright header, a plurality of inlet pipes and an outlet pipe. The header has a substantially vertical orientation relative to the ground. The inlet pipes are for interconnection with separate gas wells to allow for passage of methane coal gas and water vapor entrained with the gas therethrough. Each inlet pipe is mounted to a continuous sidewall of the header through an inlet opening of the header. Each inlet pipe is in communication with an interior chamber of the header. The water vapor enters the interior chamber of the header through the inlet pipes and separates from the gas and falls to and condenses above and within a water collection area of the header. The gas enters the interior chamber of the header through the inlet pipes and rises to an upper end of the header. The inlet pipes are arranged in series vertically and in a plurality of horizontal pairs on the header. The outlet pipe is for interconnection with an external location.