Aims of the project:
Kensa Contracting and ENGIE delivered England’s largest shared ground loop array heat pump project to replace electric heating in 8 tower blocks for Enfield Council.
The tower blocks were previously heated by direct electric underfloor heating that was electrically powered directly from Enfield Council’s landlord supply. This is an expensive and high carbon source of heat. The tenants had no control over the heating which often lead to them opening windows to control the temperature. There was also no metering provision and therefore tenants paid a fixed monthly fee to cover heating regardless of how much heat they required. Typical annual heat costs were £800 – £1,100 per flat – putting many tenants into fuel poverty and causing Enfield Council to have serious concerns about the health and wellbeing of their tenants.
Kensa Contracting and ENGIE drilled a total of 100 boreholes with depths ranging from 197 – 227m across the 2 sites. These were connected to the tower blocks via underground header pipes and riser pipework running through the stairwells providing a source of heat to 402 flats.
A compact and ultra-quiet Shoebox ground source heat pump from Kensa Contracting’s sister company, Kensa Heat Pumps, was installed within each flat along with a hot water cylinder. Every flat has their own heating and hot water controls, and as the heat pumps were all connected to the flat’s own electrical supplies, every tenant automatically only pays for the heat they actually use – simply via their electrical bills. Because of the high efficiency of the heat pumps (300%), the heating and hot water costs for each tenant are now £350-400 per year representing a massive saving and making a significant difference to tenant’s finances.