Three common myths about ground source heating

The ground source heat pump's energy consists of solar energy stored in the ground, which is an environmentally friendly energy source. A common misconception is that ground source heat can run out, especially if numerous boreholes are drilled for ground source heat in the same neighbourhood.

This is not the case. As long as your ground source heating system has the proper dimensions, the borehole will continue to supply heat for as long as you want it. Recharging takes place both from the surface, when the sun is heating it up, and from below, which is known as ground source heat.

It is best to remember that the boreholes should not be too close to each other as they can draw power from each other. One rule is that there should be at least 20 metres between each hole.

It is usually estimated to take about a day to drill an average borehole under normal conditions. This is normally followed by some excavation work, dismantling of the existing boiler (if there is one) and installation of a new heat pump. The heating in your house often only needs to be switched off for a few hours.

Are there any exceptions? Yes, for example, the depth of the borehole determines the extent of the work. The more efficient the pump, the deeper the borehole; your installer can tell you more about this when you discuss drilling in your home.

Here's how to install ground source heating in your home

Boreholes for ground source heating do not require a large area on your property — most boreholes have a diameter of 115–140 millimetres. However, the rig used for drilling will need to be transported through the garden and set up for the drilling itself.

Together with your installer, plan a good route in advance through the garden to the borehole and decide where the hole will be placed. A ground cover can protect the lawn or flower beds from damage. The house façade can be protected with a tarpaulin to avoid splashes.

When the work is completed, there are usually only minor traces such as imprints in the grass and a little "mud slurry" around the borehole itself. One piece of advice is to specify in the quote beforehand who is responsible for restoring the garden, i.e. you or the excavation company.

Your ground source heating guide — facts, tips and advice before deciding