With a ground source heat pump, how is energy collected from the ground?

There are three options to obtain the energy from the ground.

Horizontal collector - lengths of pipe are buried underground to a depth of around 1 or 2 metres. This is a good solution if the property has enough land to accommodate the collector.

Compact collectors - which reduce the amount of space required for the collector.

Horizontal collector - A bore hole is drilled to a depth of between 60 and 200m and the collector is fed into the hole. A vertical collector minimises the amount of land required on the surface for a collector.