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Project specification

  • Property type: Country estate
  • Technologies installed:
  • Collector type:
  • Size (kW): 180
  • New/retrofit: Retrofit
  • Brand: EcoForest

The National Trust’s Wimpole Hall in Cambridgeshire was previously heated by direct electric heating and oil boilers that were past their best. The Trust was paying over £20,000 each year to heat the property. As part of the National Trust’s Renewable Energy Investment Programme, isoenergy was selected as the installation partner after a tendering process.

Isoenergy designed a system that shared a borehole array between two heat pump systems that work independently. One heat pump system is located in the main building itself and another separate system is located in the Old Rectory Restaurant. Both systems draw energy from the borehole array in the carpark area of the estate. The larger system in the mansion produces heating for the house and two staff flats. The other system in the restaurant generates both heating and hot water.

Key features:

  • 72% reduction in CO2 output for the estate heating
  • 140kW Ecoforest ground source heat pump system in the main house
  • 40kW Ecoforest ground source heat pump for the restaurant
  • 800 litre hot water tank for the restaurant
  • Common borehole array of 34 boreholes 125m deep

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