Solar Hot Water Performance data  

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  Click here to see daily temperature readings for this year from bottom of hot water cylinder. The readings are taken each evening. Temperature at bottom of cylinder is used as it is only influenced by solar gain, heat exchanger from boiler is two thirds of way up cylinder(see picture).

Taken from an article in ‘The Citizen’ newspaper Oct 2000


  Amazingly we had a reading of 35 deg C on the roof in December when the tubes have been covered in snow.

The gas bill of just 57 pence for the 3 months over the summer was for one unit of gas. This was used by the gas hob in the kitchen as the boiler was not needed to heat any water
  Graph of 2016 data

Graph of 2015 data

Graph of 2010 data

Graph of 2009 data

Graph of 2008 data

Graph of 2007 data

Graph of Jan 2003 data

Graph of 1999 / 2000 annual data

Graph of 2000 / 2001 annual data

Graph of 2000 / 2001 monthly data

Graphs of pump speed comparisons

Interesting facts about system operation