Ground-Source.co.uk

Renewable Energy Heat Pump Experts
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Ground Source Heat Pump Installation Options

Various Primary Source Options With GSHP

Open Loop

Closed Loop Boreholes

Closed Loop Slinkies

An open loop ground source heat pump uses an abstraction borehole to supply groundwater as the fluid for the heat pump and then re-injects the water back to the aquifer or a nearby watercourse via a re-injection borehole. 

The most common configuration for an open loop ground source system is a borehole. 

This is a more efficient method and a coefficient of performance (COP) of over 5 can be achieved. An open loop system can also utilise stream, lake or pond water.
A closed loop borehole ground source heat pump is comprised of a sealed pipe network that is placed into a borehole typically 60 to 100m deep.

Deeper Ground temperatures remain at a constant 8-10ºC providing an adequate energy source for a heat pump.

Depth of borehole will depend on ground conditions. Use where space for slinkies or trenches is not viable.


A closed loop ground source heat pump is comprised of a sealed pipe network that is buried well below the ground, through which the system’s fluid is continuously circulated. 


Slinkies are very effective way of installing ground arrays simply because it requires minimal digging. This length of coiled plastic pipe buried beneath the ground can be installed on the vertical edge or horizontally.