Energy from the soil

The soil on which your home is placed, is a zero cost energy supplier. Soil heat pumps use heat that is stored in the ground. The soil offers constant temperatures nearly throughout all the year. This results in a high value of a heat pump as well as a low total energy consumption for the heat produced. There are two versions available: 


Ground collector

For heating your home you normally require 1,5 times garden area compared to thespace to be heated. Before installing the ground collector, the required area will have the top soil removed by an excavator. Afterwards, a sand base is created and the individual collector loops are installed. After placing the collector loops, the removed soil will be spread again cautiously and then compressed. 

The area consisting of collectors must not be built over. Surface collectors are easy to place, are suitable especially for new buildings and only cause low investment costs.

Ground collector direct system

The ground collector is a pipe system, which is installed about 1,5 m below the surface of the earth. The agent circulating in the pipe system withdraws the sun´s energy that has been captured by the soil. Due to the thermal absorption, the agent evaporates and gives off the heat obtained through the heat pump to the heating system. 

In contrast to the ground collector indirect system (Brine-ground collector), no antifreeze, no energy source pumps and no additional heat exchanger (Brine/Agent) is required.


  • best price-performance ratio
  • lowest operating costs
  • all season use for heating and warm water production
  • highest operational safety
  • long lifetime



Ground probe

In a system utilizing a ground probe, two or more vertical wells are sunk into the soil to a depth of 100m. A piping system is installed into the wells and then, these will be sealed. 

The heating media circulating in the pipe system absorbs the stored ground heat and gives off this heat to the working agent in the heat pump.


  • low space requirement, thus suitable for new buildings and renovations
  • constant heat source throughout the entire year, even in case of very low outside temperatures
  • repeatedly proven technology
  • all season use for heating and warm water preparation


CO2-ground probe

The patented CO2-ground probe developed by M-TEC uses CO2 (carbon dioxide) as a heating media. The CO2-probe adds a level of efficiency to the basic ground probe. The probe pipe contains both liquid abd  vaporous CO2. The liquid carbon dioxide is located in the bottom part of the probe, the vaporous in the upper part. Due to thermal absorption, the liquid CO2 evaporates, rises and gives off the heat to the agent in the heat pump via a heat exchanger. Due to this heat emission, the CO2 becomes liquid again and flows down in the probe pipe. The soil heats up the CO2, it evaporates again and rises. This ensures a constant cycle.


In contrast to the conventional ground collector indirect system (Sole-ground collector), no energy source pump is required a resilt of the natural self-circulation.

Advantages of the CO2 ground probe:

  • natural heating media (usage also possible in water protection areas)
  • high operational safety (no moving parts)
  • lowest operating costs (no energy source pumps)
  • no antifreeze required (durability)


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