Four energy sources

Solar energy that can be used to heat your home is stored in the bedrock, ground, air and water. A heat pump utilises this inexhaustible and eco-friendly source of heating and transports it into your home. The type of heat pump depends on where you fetch the stored energy from.

Ground source - vertical loop

 The vertical ground loop collects solar energy stored in bedrock. A hole is drilled into the bedrock and a pipe is
laid to a depth of between 100 and 200 metres. The exact
depth depends on the house, size of heat pump and
surrounding conditions.
There is a common myth about heat pumps that they will
not work if several homes in the neighbourhood have
already drilled down to the bedrock. This is definitely
not the case! The Earth's ability to store heat is almost
endless - there's enough heat for everyone.


  • A large plot is not necessary.
  • Small impact on the plot.
  • Cooling is possible.

Read more about geothermal heat pumps.

Ground source - horizontal loop

The horizontal ground loop collects solar energy stored in the ground surface. If the bedrock is too deep, or if you do not wish to drill for other reasons, this alternative is a good choice.

The loop is buried round one metre beneath the surface of the land and energy is extracted from the ground. The length of the loop depends on the house, the size of the heat pump and local ground conditions.


  • Lower installation cost compared with vertical
    ground loop.
  • Can also be used to extract heat from lakes
  • Ground loop maintains consistent temperature throughout the year.
  • Cooling is possible.

Ground water source

 A groundwater heat pump collects energy from the groundwater. The water is pumped up from a water borehole
to a heat exchanger, where the energy is recovered.
The water is then discharged back through another well.
This solution can be the right alternative when groundwater
is readily available.


  • High and even temperature in the groundwater all year round
  • Cooling is possible

Air source

With an air heat pump there is no need to dig or drill.

Instead you take the energy straight from the surrounding air.

To obtain a complete system that covers all your heating requirements, including hot water, you need an air/water heat pump. In comparison, an air/air heat pump is only capable of supplying heating, not hot water.


  • Lower investment cost.
  • No impact on the ground.
  • No large plot needed

Read more about air water heat pumps.

The sun heats the air, ground and water every day. A heat pump captures this free energy very efficiently.

Choose between heat from the bedrock, ground, water or air.

Requirements Overview