New Viessmann boiler integrated with vacuum solar thermal system. This was installed in September '07 and a graph was kindly sent to us by Mr G at the beginning of Nov '08 showing his energy consumption dropping by approximately 50%. Graph is courtesy of E.On Energy.

 

 

"Here's a graph showing the reduction in our gas consumption, as promised. The red line is 2007, the blue columns are 2008. The graph compares gas usage before and after installation last autumn. Feel free to use this image on your website. It was generated by E.On" Mr J Graham