020 8989 7134 info@groundsun.co.uk

GSHP for Grade II House in Royston 

This 200 year old property was converted from an Oil fired boiler to a high efficiency ground source heat pump on Boreholes 

  • Date: Feb 2019
  • Client: Mr & Mrs Newman
  • Project Type: Grade II Listed

About this Project

Mr & Mrs Newman  wanted to future proof their property and stop importing fossil fuel heating oil. The new heating system involved the following

  • 270m2 5 bedroom property
  • 3 boreholes, depth of 110m  through 6 differnet types of challenging geology, clay, gravel, flint, chalk, green sands , mudstone sands
  • 500 Litre Unifresh Hot water/combination buffer cylinder – hygiencially fresh hot water
  • 14kW ground source heat pump 
  • Loft insulation (RHI requirement)
  • Solid walls unchanged 
  • Single glazed windows unchanged
  • No floor insulation 
  • Gov’t RHI Renewable Heat Incentive £35,489 over 7 years 
Grade 2 listed property single glazed no insulation grround source heat pump 1

Following the installation the Client was very please and wrote this notice and review of our work. The notice remains on the wall for passers-by and church goes to learn more about renewable heating with heat pumps and how our designs for grade 2 listed properties enable them to switch away from the fossil oil grid 

Review of a ground source heat pump by our client - Copy

Phase 1 Drilling 

The Drilling process took 7 days from start to finish with a 12 Ton rig and full mud treatment unit to keep the site tidy the boreholes where then connected back into the boiler room and pipework electrofusioned a thte joints nad manifold, follwed by pressure testing pipework and flushing with biocide 

ground source heat pump drilling in small drive way tight space
Borehole electrofusion connection to a grround source heat pump
disposal of the mud form drilling a grround source heat pump
Borehole electrofusion connection to a grround source heat pump
How do you connect a ground source heat pump on boreholes to a property?
disposal of the mud form drilling a grround source heat pump

Phase 2 Heat Pump and Unifresh Tank Installation 

The oil boiler was removed and disposed of, the heat pump and 500L Unifresh hot water tank & heating buffer were installed and commissioned. 

The existing radiators were not allowed to be changed due to the listing of the building, however, the heat pump runs on weather compensated heating curves for efficiency and comfort and the property is heated very well in what is a very cold part of Hertfordshire with temperatures dropping to -5degs during winter. Ground Suns design of the whole system allows for properties like these to be heated all year round. With the correct engineering approach hard to heat properties with no insulation and single glazing are made sustainable for the future

Before and after oil boiler to ground source heat pump plantroom
Grade 2 listed property single glazed no insulation grround source heat pump plantroom 4

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