A geothermal heat pump utilises the solar energy stored in the ground. A series of collector pipes are buried at one metre depth and are filled with a non-toxic liquid that warms up a few degrees by the surrounding ground temperature.   

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Ground Source Heat Pumps - a perfect and proven solution!

 When the liquid is returned to the heat pump it increases the temperature of the refrigerant in the heat pump and the heat pump compresses the refrigerant which raises the temperature. The geothermal heat that is generated in this process is then used for space heating and domestic hot water. An average geothermal heat pump installation will require a plot of 250-400 square metres. In retrofit situations this should be considered alongside the general upgrade of the building fabric’s thermal conductivity (reduced U-values) BER/EPC also advised.

It is also possible to bore a hole and install a closed system (water glycol) of collector pipes which are lowered in the borehole. The heat there is converted in the same way as with geothermal horizontal collector. This form of heat production is reliable and can be used when space is at a premium.

Payback period for geothermal heat pump systems

The initial capital costs of installing a geothermal heat pump system is higher than other conventional central heating systems. However, the system is among the most energy efficient and cost effective heating systems available and the payback is typically about 4-8 years. The life expectancy of the geothermal system is 25+ years

Heat pumps work best, even in Ireland!

A geothermal heat pump is effective even when it is cold outside. This is especially the case with a geothermal system for soil or bedrock heat. This is because the soil or the bedrock store solar energy very efficiently. When it is really cold, the built-in heater of the geothermal heat pump can provide the additional heat that may be required.