What is the Open-Loop System?
This type of system is less commonly used because of local code restrictions and the lack of an aquifer (underground lake). It is, however, the simplest to install. This system will pump ground water through a well directly from the aquifer. Heat from the ground transfers to the heat pump and the water is returned either to a pond, river, lake, or to a drain field, or it is pumped back into the aquifer.
