Over eight tower blocks, 400 apartments in the London borough of Enfield will be retrofitted with Shoebox heat pumps manufactured by Kensa Contracting's sister company Kensa Heat Pumps, and connected to the largest collection of district arrays of its kind.

Planned for completion in October 2018, the heating upgrade aims to reduce residents' energy bills by 30-50%.

Dr. Matthew Trewhella, Kensa's contracting director, commented: "This project is an excellent example of how district heating can be rolled out using the shared ground-loop system architecture.

"One of the great strengths of this system type is its flexibility and scalability. Shared ground-loop systems can be featured in developments of just two properties (micro-district), whilst this project clearly demonstrates how the concept can be scaled up to much larger systems.

"Not only do ground-source heat pumps provide the lowest cost heat, they also deliver substantial carbon savings, and landlords benefit from the exceptionally low servicing and maintenance costs."

The district ground-source heat network system at Enfield will feature 16 shared ground-loop systems serving the tower blocks. Each district system will typically consist of clusters of eight boreholes serving individual heat pumps installed within the flats of half a tower block.

This system architecture allows each resident to select their own preferred energy supplier to access the best available electricity tariff. The shared nature of the ground array design also reduces drilling costs - typically the most cost-prohibitive aspect of a ground-source heat pump installation - and ensures funding through the Energy Company Obligations (ECO) Scheme, as well as the government's Non-Domestic Renewable Heat Incentive (RHI), securing Enfield Council quarterly payments for 20 years.

Drilling of the boreholes has already commenced with one site's groundworks completed prior to the end of 2017.