DigiGroup Sustainable Case Study - Air Source Heat Pump Installation

The Client: Network Stadium Housing Association
Site Address:12 Gildea Close, Pinner Rd, Harrow HA5 4SD
Date and duration: September 2010 – 7 day installation. Value:£9,000

The Customer Brief. Network Stadium Housing Association approached DigiGroup’s Sustainable Energy Manager, Simon Ellis, indicating an interest in setting up one of their existing properties as a sustainable energy flagship project. Working closely with the client, DigiGroup, an approved and accredited MCS Installer of Air Source Heat Pumps and Solar Photovoltaic systems, identified 12 Gildea Close as the project target. The purpose was to prove that sustainable energy solutions did more than tick a box on the Housing Association’s environmental objectives but provided a clearly measurable benefit that could be used to enable a wider programme to be designed with accurate assessments of the contribution to relieving fuel poverty.

The Solution. Gildea Close is a relatively new development (15 years old) with satisfactory insulation already in place. New storage heaters were due to be installed at a cost of £4,200. DigiGroup illustrated through forecasted cost savings how, by installing a 5kw Mitsubishi Ecodan unit, that not only would carbon emmisions be reduced but also a significant monthly fuel bill saving could be achieved – target 30%. The £9,000 cost included the installation of a new central heating system including radiators, plumbing to all rooms, a bespoke hot water cylinder and expansion vessels. It should be noted that these components are in relative terms a one off cost, as they will outlast the lifespan of the Air Source Heat Pump. This means that when the ASHP needs renewing the installation costs will be dramatically reduced, therefore increasing the financial benefit immediately.

The Results. After the initial installation was completed, DigiGroup provided a complete and comprehensive handover pack, and training programme to the resident. This detailed how to maximise the efficiencies of the Air Source Heat Pump through best practice. This was supported by weekly site visits and telephone support for the resident. Fuel bills were monitored over an 8 month period that covered the severe winter of 2010/11. Analysis of the fuel charges showed a saving in the monthly fuel expenditure of 43%. Charges of £96 per month were reduced to just £54 per month.