Glenuig Ground Source Heat Pump Case Study 


Technology Installed:

Ground source heat pump with integrated thermal solar panels.

IDM Energie Heat Pump, Terra type 26s and Tisun FM-S solar panels


Generating Capacity (kW): 

26.6 kW, 400v, 3 phase heat pump

10 kW solar panels







Property Type and Size 

Large detached house (circa 300 sq m) built from SIPs (structural insulated panels) with harled block outer skin.


Installation Date: 



What is it replacing?

New build


Who installed it? 

Designed by Invisible Heating Systems, Ullapool (firm in liquidation)

Installed by Corries (firm in liquidation)

Ground works by MacGillivray Ritchie Ltd., Acharacle


Installation Cost

Materials (heat pump, heat store, solar panels, circulating pumps, under-floor heating pipes, ground-loop pipes, control systems, thermostats and so on – BUT not installation as this was part of the new build. £18,000


Grant/Funding Received/Will Receive (FiTs /RHI etc.):

£4,000 grant from Scottish Community and Householder Renewables Initiative.


Any issues encountered?

The control system is complex and not easy to operate.

Room thermostats are naff

Thermal solar panels are excellent

This model heat pump is not an efficient way of heating domestic hot water


Time from planning to installation? 

Several years


General Advice for those interested: 

Get expert advice


Talk to owners who have a system installed


Would you recommend the technology?

Thermal solar panels a definite yes

Ground source heat pump – possibly yes

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