What are Heat Pumps?

Taking energy from the ground (generated by the sun) to produce heat from pipes in the ground, loops in a lake, or energy from an underground aquifer. Ground arrays can vary in design and direction (horizontal or vertical) depending on the amount of land your property has and its geological make-up. There is a misconception that you need lots of land for a GSHP system, however, from experience this does not always need to be the case. The most efficient system is using boreholes, and the most efficient borehole system is an open loop system that extracts water from an aquifer. This method can also give a separate water supply for the property. GSHP systems have been used in other parts of the world for decades. Although still relatively new in England, the technology is very well proven and works in the same way as a fridge freezer – but in reverse. GSHPs can be used for a wide range of projects and system sizes, ranging from small single domestic installations to multiple large commercial installations where multiple GSHP units are linked.
Works in a similar way to a Ground Source Heat Pump. However, rather than taking energy from the ground it takes it from the surrounding air to generate heat. Systems are far cheaper to install compared to the equivalent GSHP system as you do not need to install the ground array. However, performances (CoP = Coefficient of Performance) are not quite as good as a GSHP system.

Where are ASHP systems installed?

Typically installed in large, modern, off gas office blocks, hotels, hospitals and nursing homes. Often used as a pre-heat to another fuel source or dedicated to hot water generation.
Typically installed on modern, new-build properties with high levels of insulation. Also good for heating swimming pools -especially external pools that are predominantly used just in the summer months.

Where are GSHP systems installed?

Large commercial systems can vary greatly, however, a typical installation could be a large new build office block, nursing home or hotel to name a few. GSHP are also fantastic at heating swimming pools. Systems can often be a ‘pre-heat’ to cater for 90% of the annual heating and hot water requirements, but is then backed up with a smaller boiler of some description in times of really cold weather just to boost the system.
Each project is different, however, typically on new build projects or where a property has good thermal insulation levels – ideally, insulation in the floor, walls and roof, together with double glazing. In older properties we would sometimes need to upgrade the size of the radiators in order to give the right heat output needed to satisfy heat demand.

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