Ground-source heat pumps-free energy stored below the groud

Heliotherm’s ground-source heat pumps run on three different systems:

	Ground-source heat pump with ground-surface collectors (direct evaporation) Energy is produced using collector loops that are buried in the ground. The system boasts low procurement costs and a COP of up to 5.6. This corresponds to 82% free energy from your own garden. » Ground-source heat pump with ground-surface collectors More details...
	Ground-source heat pump with CO₂ ground probe Energy is produced using copper pipe probes filled with CO₂, which are buried in the ground. This system is environmentally friendly (suitable for water protection areas) and has a COP of up to 5.0. This corresponds to 80% free energy from your own garden. » Heat pump with CO₂ ground probe More details...
	Ground-source heat pump with brine probe Probe pipes filled with a brine solution (water and antifreeze) are buried in the ground and act as a heat transfer medium. Available as a horizontal or vertical system. » Ground-source heat pump with brine probe More details...