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Ground Source Heat Pumps

Terra | Terra Max

How it works

Life never stands still and this is how the Terra heat pump operates. It uses a renewable
source of energy, which costs nothing, is always available and does not use up natural
resources or produce any waste products.
Heating and cooling for life.

Glycol Circuit Heat Pump Circuit Warm Water Circuit
Stored heat from the environment Heat transfer and
temperature rise
Usable heat

The geothermal heat pump cools a water/ glycol mix down to a temperature of 5°C. In a closed loop geothermal circuit, this mix circulates into the ground, up to 100 m deep. The temperature there is around 19°C regardless of the season.

By cooling the ground the mix warms up and flows back to the heat pump. In a plate heat exchanger the just absorbed heat is extracted and then elevated to a higher temperature level, enabling the transfer into the warm water for space heating or hot water for domestic use.

In essence, heat pumps harvest low temperature heat from soil, water or air and make it usable in the house for heating and hot water. Since heat from the ambient is for free, the only input that has to be paid for is the electricity to operate the compressor, the circulating pumps and control equipment.

The heat pump takes energy from the air, from water or from the soil to provide heating and hot water.

Although still relying on electricity the geothermal heat pump is able to convert 1 kWh of electricity into up to 5 kWh of heat, thus making the heat pump five times more efficient than conventional electrical heating systems, reducing the heating costs by 75 - 80%.
  How it works

Deep bore brine circulation

  A plastic geothermal energy probe is inserted into a borehole in the ground. The brine flows deep into the ground and back again, bringingup free heat from the surrounding earth.

For a heating capacity of 10 kW, two probes with a length of 100 m each are needed depending on the structure of the ground.

The probes are guaranteed for 10 years, but are expected to last longer.
temperature development

  Deep bore direct cooling
At a depth or 20 m or more, the ground temperature remains constant at over 19°C with no seasonal fluctuation. This constant temperature means the brine can absorb sufficient heat in winter and is ideal for cooling in summer.

Cosiness and Comfort

Heating and cooling at the touch of a button
(no purchase of oil, wood or gas)
Comfortable temperatures the whole year round
(automatic switch over into cooling mode)
Silent operation
(no noisy fans, no draft)
Clean operation
(no smoke, no ash by-products)
Risk free
(no danger of fire, no oil storage necessary)
Extremely reliable
(no burner to go wrong)
Low temperature heating provides pleasant
room temperatures without hot spots

Low installation effort

No chimney
No gas connection
No fuel storage tank
No fire door required
No additional geysers
No individual room heaters
No individual air-conditioning units

Low running costs

No storage of heating materials
(no financing)
Low service costs
(no oil nozzle changing, no dirty oil burner)
No chimney sweeping

Economical and ecological aspects

The value of the property is enhanced due to an innovative green central heating system  
Approximately 75 - 80% of the energy needed for heating can be provided free of charge from the soil, the air or from the ground water  
Additional electricity savings through lower tariff brackets  
Additional financial incentives may be available (depending on the local area)  
Huge reduction of the personal carbon footprint  
First step towards Green Energy Building  


The Terra heat pump absorbs energy from the environment free of charge and transfers it into an under floor heating system and hot water for domestic use, rendering the heat pump an innovative, convenient and reliable technology adding value to every home and office building.

Stamp of Quality

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Terra Heat Pump

The Terra heat pump from IDM
extracts free energy from the soil, ground water or air and
delivers heating and hot water to the building. During summer the cycle is reversed, extracting
heat from the house and giving it back to the environment.

Terra Heat Pump Terra heat pump inner workings
5 to 30kW capacity range with one unit  
HGL technology - domestic water on demand  
Heating & cooling - active or passive cooling  
Heat pump
1 Hot gas heat exchanger
2 Regulation valve
3 Compressor
4 Loading pump


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Terra MAX Heat Pump

IDM Terra MAX heat pumps are the ideal solution for large buildings and have already
won over a number of investors. Wherever heating and cooling are required, lower operating
costs play an especially important role. And with heating outputs up to 110 kW per unit and
up to 550 kW in cascades, the Terra MAX can cope with the requirements of virtually any building.

Terra MAX
50 to 110 kW heating capacity with one unit  
HGL technology - domestic hot water on demand  
TWIN technology - two independent heat pump circuits  
Up to 65 °C heating water supply temperatures possible  
Heating or cooling with one unit  
How it works

Double Safety

The IDM Terra MAX heat pump has TWIN technology: two independent heat pump circuits in
one unit. This provides safety, a high degree of flexibility, two-stage capacity control with less
start-ups under partial load conditions and an extended service life.
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For the garden
The area of ground used can be planted without difficulty and the plants can grow undisturbed.  
For planning your home
The Terra heat pump is quiet, takes up little space and requires an indoor location to be installed together with its tank, pumps, valves and control equipment.  
For heating
The lower the flow pipe temperature, the higher the efficiency of the heat pump. Both floor and wall heating systems are suitable as the flow temperature is low.
When restoring older buildings, it is possible to use heating radiators suitable for low temperature heating.
For gaining local authority approval
The operation of geothermal energy equipment needs the approval of the local authorities. This should be sought before construction begins.  

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