Solar Thermal Installation, Retro Fit

Key Points – Solar Thermal Installation – Retro Fit Sheffield, UK
Type of Property / Building Detached House with Rosemary Tile Pitched Roof
Technology Solution Solar Thermal
Type of System Three Calpak VTN 10 Panels with 280 litre Cylinder

The system installed allowed integration of solar thermal technology with an in-direct hot water scheme. The scheme utilises a system boiler that to provide hot water during periods of no sun. A twin coil unvented cylinder is installed so as to allow two sources to heat the cylinder. On days when the solar radiation is limited, any solar energy gained preheats the water in the cylinder, if further heating is required, the boiler can top it up.

This means that when this water enters the in-direct cylinder, the system boiler only provides the additional heat required to bring the water up to a usable temperature when required, thereby saving energy and utilising all the solar energy gained, even when the available solar energy is modest.

On days when there is a larger amount of solar radiation, the system is able to generate a full cylinder of hot water. When this occurs no boiler hot water heating costs are incurred. This system is designed to supply 60% to 70% of the annual domestic hot water requirement.

System configuration

System configuration – Solar Thermal Installation – Retro Fit Sheffield, UK
Number of PV panels 3 Panels
Weight of each PV Panel 37kg
Area of Panels 5.4 Square Meters
Type of panels Evacuated tube
Type of roof kit On roof fitted vertically (portrait)
Type of System In-Direct

Performance Benefits / Savings

  • Provides 60-70% of annual domestic hot water requirements
  • Energy costs savings £240 per year
  • Reduced gas consumption
  • Reduced carbon emissions
  • Extended boiler life