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Having received conflicting information from various independent consultants regarding a ground source heat pump solution, the owners of Llandraw Farm turned to isoenergy to provide clear advice and design the best sustainable energy solution for their needs.

Sitting in the rolling hills of rural Herefordshire overlooking the Welsh border, the Farm consists of a main farmhouse and a number of barns, all of which are being converted into domestic spaces. Being so remote, a mains gas boiler was not an option and the client wanted to avoid using expensive fossil fuels such as oil or LPG.

isoenergy suggested a 34kW CTC ground source heat pump solution with an 800 litre hot water cylinder to provide all the heating and hot water for the houses. The heat pump will be connected to seven 115 metre boreholes being drilled by Synergy Boreholes.

Although the farm is surrounded by fields, digging trenches for a horizontal collector array would be difficult as the bedrock sits close to the surface. Since drilling through bedrock is a relatively easy process, boreholes were chosen for the ground collector.

A centralised external plant room is being constructed to serve all the buildings on the site. Pre-insulated pipe will be used to connect the external plant room to the buildings, forming a district heating scheme. As multiple domestic properties are to be heated, the installation will qualify for the generous non-domestic Renewable Heat Incentive (RHI).

By installing a heat pump system, the owners of the farm will be saving about 50% of the cost of burning heating oil and there will be a reduction in CO2 emissions of around 60%


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