Solar Water Heater Circulation

Following web-sites give useful information on recirculating hot water from Solar Heater so that we can avoid wasting the water when we start the tap (initial cold water stream)


http://www.gothotwater.com/C3-100
http://diy.stackexchange.com/questions/6621/can-someone-explain-to-me-how-this-hot-water-recirculating-system-works
http://shop.solardirect.com/pdf/water-heaters/solar-hot-water/active-solar/pumps/grundfos-guide.pdf
http://www.solarpanelsplus.com/products/pumps/
http://thinkevolve.com/products/showerstart-tsv/

https://www.youtube.com/watch?v=TrsptRZtIzc

https://jon.limedaley.com/plog/post/hot-water-recirculator-is-a-waste-of-money