solar hot water heater Certificate: SRCC, Solar Keymark, CE and ISO9001 Solar hot Water Heater 1) Highly efficient absorber of high performance with ... can be connected directly with city water.4) No water inside the evacuated tubes; The solar water heater can still in service even with ... its module structure; certificate: ISO,CE,SGS, SRCC, Solar Keymark integrated low pressure solar hot water heater