Installed Kaltech Energy solar water heater 6 months back, works as the first day. They are giving a good customer support. The installation was free of cost. They come for a free site inspection. Now I dont need Cooking gas or Induction cooker for hot water. Its working as they claimed even there is no much clear sun for the whole day. Really I will be very much thankful to Kaltech for thair service. I will recommend all my friends and relative.