Case Study

GSHP solution for a Grade II listed building

In this study the featured property is a fifteenth century Grade II Listed medieval house, Cae’r March, in Snowdonia National Park, previously heated using oil fired central heating. With the remote location making deliveries challenging, the owner linked up with renewable solutions provider, isoenergy, to find a solution to enable them to move away from oil.

isoenergy GSHP case study


  • Property type: Residential
  • Technologies installed: Ground source heat pump (GSHP)
  • Collector type: Boreholes
  • Size (kW): 22
  • New/retrofit: Retrofit
  • Brand: EcoForest


The age and location of the property needed special consideration. The site had very difficult access so isoenergy had to carefully prepare a logistics plan to ensure the drilling rig and all deliveries could get to the property.

The recommended solution

isoenergy recommended a 22kW Ecoforest ground source heat pump connection to an 800L hot water cylinder and 300L buffer tank. In the grounds, Synergy Boreholes drilled five 124m boreholes.
The plant room is set within an outbuilding and was connected back to the main house using pre-insulated distribution pipework.

Key features:

  • 5-22kW Ecoforest ground source heat pump
  • Cordivari Puffer 300L buffer tank
  • 800L hot water tank


The installed heat pump solution is such that it will provide a complete heating and hot water solution throughout the year proving, yet again, that a well-designed heat pump system can heat any type of building, regardless of age or insulation standards.

This case study is shared from isoenergy – the renewable energy specialists –