How do open-loop systems work?
An open-loop system is used less frequently, but may be cost-effective if ground water is plentiful. Open-loop systems are the simplest to install and have been used successfully for decades in areas where local codes permit. This type of system uses ground water from an aquifer and is piped directly from the well to the building, where it transfers its heat to a heat pump. After it leaves the building, the water is disposed of by one of three methods.
