solar hot water heater Certificate: SRCC, Solar Keymark, CE and ISO9001 solar hot water heater1. Use in any time: it adopts advanced design ... can overcome the short of traditional SWH, such as sloe heating, long waiting time.2. More capacity: we adopt special ... buildup is almost totally eliminated. Certificate: ISO,CE,SGS, Solar Keymark and SRCC integrated Copper Coil Solar hot Water Heater