Measured electrical conductivity of the groundwater at a defined depth interval or for a single point in depth.

The intrinsic ability of hard rock samples to conduct heat.

Overall evaluation of possible limitations and restrictions to the installation of closed loop systems based on a 4 colour schemes (grey: no data available, red: no installation allowed, yellow: installation based on case to case decision, green: no restrictions known)

Energy content available per year in a defined volume of a groundwater body for heating and/or cooling applications

Installations that enable the use of the energy stored underground in a depth of up to 300 to 400 meters

Specific thermal capacity per surface area unit for borehole heat exchangers of a defined length.

Overall evaluation of possible limitations and restrictions to the installation of open loop systems based on a 4 colour schemes (grey: no data available, red: no installation allowed, yellow: installation based on case to case decision, green: no restrictions known)

The maximum temperature shift between the production and the injection well that is possible with regards to legal or ecological limitations.

Specific annual thermal energy content for heating and / or cooling referring per surface area for borehole heat exchangers at a defined length.

Thermal capacity of a well doublet for heating and/or cooling depending on the hydraulic productivity and the thermal productivity.