... the collector. In two-tank systems, the solar water heater preheats water before it enters the conventional water heater. In one-tank systems, the back-up heater is combined with the ... 10, Area A 2 CANTON FAIR April 15-19, 2010 Guangzhou 3 K/BIS May 1-3, 2010 Atlanta 4 INTERSOLAR ... 11, 2010 Munich 5 CANTON FAIR October 15-19, 2010 Guangzhou We, Changzhou Erjin Solar-Energy Equipment Making Co.,Ltd, are ...