Heat exchangers, constructed in accordance with principles of this invention, comprise a plurality of first passages, for transporting a first fluid or gas therethrough, and one or more second passages for transporting a second fluid or gas therethrough. The length of conduit is secured to the ground anchor in such a way that when the ground anchor is driven into the ground then the length of conduit is dragged through a passage in the ground formed by the ground anchor provides a drainage channel in the ground. The interrogation is performed before and during the initialization of the mailing machine with predetermined INIT data.