Horizontal Collector



Bore Hole Collector



























Ground Source Heating

Ground source heat pumps offer an extremely efficient use of energy. For every 1kW of energy used to operate the heat pump provides 4kW of useful heat for the property.


How does a heat pump work?

Ground source heat pumps use energy stored in the ground and convert this to heat for space heating or hot water production. Low temperature energy from the earth is passed through a CFC free refrigerant cycle which converts this energy to higher temperatures for use inside the home or workplace.

  1. Heat withdrawn from the ground is transferred to the refrigerant. The refrigerant absorbs the heat and changes from a liquid to a gas.

  2. The gaseous refrigerant is then passed through a compressor. As the gaseous refrigerant is compressed, its temperature increases further.

  3. The heat from the refrigerant is now directly transferred to the heating circuit. The refrigerant is cooled down and returns to a liquid form.

  4. In the expansion valve, the refrigerant is then decompressed and cools down further so that it will be able to absorb heat from the ground.

The cooling effect

Vaillant provides passive cooling with its geoTHERM exclusive product. This, in addition to heating, can provide summer cooling when used with an underfloor heating system.


Taking Energy From the Ground

The Vaillant geoTHERM heat pump extracts energy from the ground by using a vertical or horizontal ground loop collector.

Vertical collector (borehole): The space saving ground loop collector is inserted vertically in the ground. Vaillant have developed links with a number of drilling partners and will assist in the search for the right partner for the installation. The depth and quantity of boreholes required depends on the heat required for the property and the type of ground. A borehole may be as deep as 100m and multiple boreholes may be required.

Horizontal collector: A series of plastic pipes are laid horizontally in the ground to form a horizontal ground loop collector. The pipes will be buried to a depth of 1.2m and the amount of pipework required depends on the type of ground.


How energy efficient are they?

Heat pumps provide background heating and cooling as well as hot water to appliances and basins, with extraordinary energy efficiency. The only energy consumed is for the periodic operation of the pump. The heat pump unit also contains a 4 kW back-up heater that automatically boosts the hot water temperature when necessary and at times of peak demand. With the exception of this supporting back-up heater, heat pumps make households virtually independent of conventional energy sources. As much as 75% of energy needed for heating and hot water can be provided by heat pumps using a zero-cost natural source of energy.


Is your home suitable for a heat pump?

The heating characteristics of heat pumps make them ideal for homes with underfloor heating. They are suitable for all types of houses and small apartment blocks. The vertical borehole requires minimal space in the area around the building. The only limitation for heat pumps is in achieving a satisfactory balance between the energy loss of the building and the required flow temperature of the heating system. For these reasons heat pumps are most suitable for new buildings and major refurbishments.