Ground Source Networks

A networked ground source system uses an array of shared boreholes, drilled into the ground, to extract stable, ambient renewable heat.

Each home is equipped with its own compact ground source heat pump, which draws the ambient heat from the shared ground loop, and delivers heating, hot water, and optional passive cooling.

The network infrastructure is designed, installed, and maintained by GTC, while each home’s ground source heat pump operates independently, giving residents control over their own home heating and hot water.

Ground source heat pumps draw their heat energy from the ground, which maintains very stable year-round temperatures (typically 10-13°C), rather than outdoor air temperatures which fluctuate significantly.

This means that ground source heat pumps deliver consistent efficiency regardless of energy conditions, producing 3-4kWh of heat for every 1kWh electricity consumed. This results in stable running costs, lower carbon emissions and lower electrical demand on the grid.

There are several advantages to networked ground source heat for housebuilders.

It requires the same electricity grid demand as a gas heated home, removing the need for costly and time-consuming grid reinforcements that individual ASHPs may trigger.

GTC is investing in the shared ground loop infrastructure and ground source heat pump allowing savings on per-plot costs.

There are no requirements for external plant visible on the property, with no outdoor unit, the visual appeal of the street scene is preserved.

Finally, the system is compliant with the Future Homes Standard (FHS) and provides a straightforward route to meeting carbon emission targets.

Our ground source heat pumps have one of the smallest footprints on the market, designed to fit into a cupboard, typically beneath a hot water cylinder, or under the stairs. There is no external unit and noise levels are comparable to a domestic fridge. A larger heat pump can be installed in a garage.

Yes – the Networked Ground Source Heat Pump system is suitable for use in apartments, smaller homes and larger homes. The heat pump size will change per heating demand, typically, larger homes need a larger heat pump. All units are designed for UK housing types and are installed as simply as a gas boiler. It is compatible with underfloor heating and modern radiators.

The UK does have a varied geology, which does influence borehole and network design. Factors such as thermal conductivity of the underlying rocks will affect the number, depth and spacing of boreholes. GTC generates desktop geological assessments at the quote stage, determining the heat demands based on the housing mix and property details.

Virtually all locations can be drilled, but where site conditions require it, we identify and commission the necessary surveys and permits, including UXO (unexploded ordnance), mining reports and multiple environmental assessments.

Our boreholes are ideally located in the adoptable verge or footway. We can install in management company land, shared access/gardens, the adoptable carriageway or private land (with the necessary land rights).

Heat network regulation was introduced by Ofgem in January 2026 and statutory undertaker rights for installation and manufacture are expected to follow in Spring 2026.

Ofgem regulation introduces key consumer protections around these areas; Standards of Conduct, quality of service, billing and transparency, back-billing, heat supply contracts, protections for vulnerable consumers & security of supply.

Any operator or supplier must be authorised by Ofgem, and while any activity carried out before 26 January 2027 is automatically deemed authorised, Ofgem will still apply its general authorisation conditions from 26 January 2026, making compliance mandatory. Any regulated activity starting after 26 January 2027 will need to undergo a formal authorisation process.

Borehole drilling is carried out to suit the on-site construction programme, typically once the initial road infrastructure is built and once ground levels are within approximately 1 metre of finished level. Borehole drilling progress varies per site geology, but usually 2-3 per week. Close contact is maintained with the developer to ensure coordination of works.