1) Q. How many boreholes will I need?

A. Starting with the heating requirement (sometimes taken from detailed Heat Loss calculations) of your house in kW and using information about the geology estimate the heat extraction potential, we calculate the length of borehole pipe required.

2) Q.How far apart can boreholes be?

A. The boreholes are drilled radially from a central chamber. Up to 12 boreholes can be accommodated in a single chamber. Since the boreholes are drilled out from the chamber the collectors are naturally some considerable distance apart for most of their length. This ensures efficient heat collection and prevents freezing spots forming, a common problem for inadequately spaced vertical boreholes or badly laid vertical systems.

3) Q.How much room do we need to drill?

A. A drilling chamber occupies a space 1 metre in diameter. The drilling area occupies an area 2.5 metres in diameter from the centre of the chamber location.

4) Q.What type of drilling methods do you use?

A. The GRD system use primarily compressed air with water as a lubricant in certain geologies.

5) Q. Do I need permission for ground source heat pump boreholes?

A. Not usually however each site should be assessed individually. There are sometimes drilling restrictions from the Environment Agency, local planning departments and London Underground.

6) Q. What type of ground collectors are used?

A. We use P100 virgin grade high density Polyethylene pipes with a life expectancy of 100 years, factory fitted with U-bends metre marked to ensure the correct depths are achieved.

7) Q. How deep do the borehole probes go?

A. The boreholes are drilled to a typical 50m in length at angles from 35deg to 65deg. This ensures that the largest area of ground is utilised in the most productive way.