... Certificate: SRCC, Solar Keymark, CE and ISO9001 Solar hot Water Heater 1) Highly efficient absorber of high performance with daily ... one direction.3) Withstand pressure of 6 Bar, can be connected directly with city water.4) No water inside the evacuated tubes; The ... structure; certificate: ISO,CE,SGS, SRCC, Solar Keymark integrated low pressure solar hot water heater