solar water heating

I have a 1970's drainback system for my active solar house. Part of the system is to preheat water that is going into our electric water heater. This preheat system has a failed exchange coil. Let me paint a picture for you: I have a large tank in the cellar that holds 2500 gallons of hot...

The 11th Asia-pacific Water Heating Exhibition（AWHE 2016)is coming, which will be held in China Import & Export Fair Complex during Sep. 26-28, 2016. Established in 2006, formely Guangzhou International Water Heating Exhibition (Formely GWHE) develops into China’s largest and most professional...