Installed kaltech energy solar water heaters 100 litres in my home 15 months back. I am very happy with its efficiency. I am getting hot water above 85 degrees on sunny days and between 60 and 75 degrees on cloudy days. Now we are using hot water directly from solar for cooking purposes so that I could save a major part of my cooking gas. Their customer service team are very much dedicated and they resolve complaints in 24 hrs.
I would recommend Kaltech Energy solar water heaters for your domestic purposes.