Case study 8 / Mr&Mrs Peter Cobley, Clapham, London

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Description of system

The property is a refurbished three bedroom semi Edwardian house. Internal walls were insulated using 100mm celotex insulation and the windows replaced with A grade double glazed windows.

Heating provided by a high efficiency Worcester Greenstar condensing boiler. Ground floors insulated and served by high performance underfloor heating throughout. Upstairs served by standard steel panel radiators.

Solar thermal pv system consisting of 6 New Form energy hybrid solar thermal and photovoltaic panels placed in two strings of three panels each on east and west facing roofs. Each string accepted by a Stecca 500 inverter

Water conservation is met by a rainwater harvesting system which supplies water for the garden and the wcs

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Performance of system

  • Solar pv 0.93 kwp 155wx6
  • Solar PV output SAP estimated 679 kwh
  • Predicated financial yield based on SAP 2009 £356.48 (based on current rate 0.45p kwh systems installed before Dec11 2011)
  • Solar thermal SAP output 912.53kwh / annum
  • Savings in conventional fuel at 0.04p = £36.50 without RHI
  • Annual yield from RHI at 18p (proposed) £164.25
  • Combined RHI and savings: £200.75
  • Note – as of July 2012 the RHI is still in the consultation stage ad the rate is yet to be confirmed

Customer comment

"As the owners of a Victorian 2 storey terraced inner London house we have been carrying out extensive repair and upgrading work Complete Plumbing Clean Energy Ltd played a major part.Their standard of work was very good and included the installation of the solar and photovoltaic panels with related pipe-work and equipment as well as the more general plumbing work. The project was completed very satisfactorily and within budget and with the submission of a reference manual listing the work done. On completion the company provided a briefing explain the system and the control methodology. We were very please with the quality work and the helpfulness of all involved."

Peter & Jenny Cobley