Geothermal Probe - Information

Geothermal – Probe drill

From a depth of 10 to 20 metres, there is a constant annual temperature of 13°C in Central Europe which rises - depending on geothermal gradient - .by 1°C every 33 metres.

Two parallel probe loops make up a geothermal probe. For a single-family home offering 135 m² living space, a probe drill of about 100 metres‘depth is required. The borehole is drilled with a diameter of 140 mm.

Into this borehole, a geothermal probe is mounted and then backfilled with a suspension in order to guarantee an optimum thermal transfer.

The geothermal probe is connected to the heat pump with the assistance of a ready-to-assemble distributor.

Operating mode of a geothermal probe

Synthetic pipes (geothermal probes) are installed in the drilled hole. They are combined to a closed loop and interconnected with the cooling and heating system of the building.

Inside, a fluid (anti-freezing agent) is circulating which, as an energy transfer medium – can absorb and transfer both coldness and heat. In the case of heating, it is the heat pump which creates a usable temperature level. Reversible heat pumps or refrigerating machines create the temperature level needed for cooling.

Both process heat and heat of the cooling mode can be stored and used for heating.

It is an emission-free and economical heating and cooling system based on reliable technology. The electric power consumption of a heat pump saves another 3 to 4 kW of heat for the heating system. If electric energy from a hydropower plant is used, there is hardly any environmental burden at all.

Geothermal System Probe


  • Double-beneficial energy: heat energy + air conditioning
  • Optimum living comfort 
  • Clean energy 
  • Environment-friendly
  • Subsidized


Read more about the Geothermal Drilling-System.
Read more about the Construction of the Geothermal Probe.