Ground Source Heat Pumps


What are ground source heat pumps?

A groundwater heat pump heats your home by transferring naturally renewed heat from the ground outside to heat your radiators or underfloor heating. It can also heat water stored in a hot water cylinder for your hot taps and showers.

How do ground source heat pumps work?

A few metres beneath the surface, the ground keeps a constant temperature of about 11 degrees centigrade. Ground source heat pumps (GSHPs) take advantage of this constant temperature to extract the geothermal heat they need.

Loops of pipework are buried underground, either in long or coiled pipes in trenches (1-1.5 metres deep) or a long loop inserted into a vertical borehole (typically between 100-250 metres).

The pipes contain fluid which absorbs geothermal heat and passes it to a refrigerant which is then compressed to raise its temperature. A heat exchanger then extracts the heat and transfers it to central heating and hot water systems.

The ground stays at a constant temperature ensuring the heat pump can be used throughout the year.

Are ground source heat pumps expensive to run?

A well-designed geothermal heating system delivers up to four units of heat for each unit of electricity consumed.

Because of this, it also emits 70 to 80 per cent fewer carbon dioxide emissions than an equivalent oil boiler.

Maintenance costs are low and the pipework can be expected to last 50 years, with other parts of the system lasting up to 25 years if well maintained.

Things to consider

  • Geothermal heat pumps operate most efficiently and effectively in energy-efficient buildings such as new builds. To minimise heat demand, older properties may need to increase their insulation levels.
  • The size of the heat pump and ground loop will need to reflect the building’s heat requirements.
  • The area of available land, the type of ground and good access are also important.
Contact us to learn more about ground source heat pump (GSHP) installation by Prestantia Eco’s expert team.


What is MVHR?

MVHR is an energy-saving system that enables you to ventilate an energy efficient or airtight home, supplying fresh air whilst avoiding heat loss through open windows, vents and extractor fans.

MVHR stands for Mechanical Ventilation with Heat Recovery and is also known as Heat Recovery Ventilation and Comfort Ventilation. It is typically installed in new build or refurbishment projects.

MVHR uses very little energy, compared to conventional air conditioning systems and can have a very significant impact in terms of reducing energy use, CO2 emissions and heating bills.

Further benefits include:

  • Improved indoor air quality (IAQ) – odours, pollutants and pollen are filtered out by the system, so it’s great for allergy sufferers
  • Comfortable humidity levels – preventing condensation, mould, mildew, fungus and dust mites
  • Quiet operation
  • Balanced heat distribution throughout a property
  • Minimal maintenance and control – MVHR units run constantly and boost automatically when they detect changes in humidity.

How does MVHR heat recovery ventilation work?

An MVHR system consists of a central heat exchanger which is usually installed in the roof space, and a network of ducting installed within the walls of your home.

Ducting will draw stale and humid air from bathrooms, kitchens and utility rooms. The heat exchanger will extract around 90 per cent of the heat from this air and use it to warm incoming fresh, filtered air which is blown to all rooms by a quiet fan.

Will an MVHR system save me money?

An efficient MVHR system should reduce heating bills by up to 30 per cent because it will retain so much heat compared to a naturally ventilated building.

MVHR systems operate using very small motors to circulate the air. These use the same amount of electricity as a low energy light bulb, costing around 10p per day.

If you would like to help save our planet and save money at the same time, please get in touch