Non-Domestic Ground Source Project of the Year 2017

Published: 01 December 2017

Non-Domestic Ground Source Project of the Year 2017

Winners: Finn Geotherm - RAGT glasshouse

RAGT’s initial brief was to reduce the heating costs for its six glasshouses, which are used for developing new crops. LPG had previously been used to heat the glasshouses which, with a U value of around six, meant the boiler was in constant use in winter, leading to issues with fuel supply and heat distribution as the system couldn’t keep up with the heat being generated.

RAGT needed a new system that was energy efficient, sustainable and could also be retrofitted to current equipment, including its existing grow tubes, and use the current plant room.

​This is the biggest heat pump installation that Finn Geotherm has undertaken to date, they specified and installed three Lämpöässä T120 ground source heat pumps linked to three Akvanti 2400 litre thermal stores.

A network of 21,000 metres of collector loop was meticulously installed, with each loop no more than 500 metres as recommended by Lämpöässä to minimise pumping energy losses via the series of manifold chambers..

In addition, each of the 42 loops was carefully modelled and nested in the trenches to ensure cold flows did not cross with warm returns and impact the system’s efficiency.

Highly Commended: Kensa Heat Pumps and Flagship Housing - Fressingfield Heat Network

Sponsored by


  • Viessmann and Matrix Energy Systems - Ballman Estate
  • Ground Heat Installations - Sheltered residential housing
  • Ecoliving - National Museum of Flight
  • Viessmann and Earth Source Energy - Kyle Blue Bristol Floating Hotel
  • Matrix Energy Systems - The Squire Performing Arts Centre