... .4. The material of stand frame is stainless steel with 1.2mm thickness. The angle of the frame can ... the coil, it absorbs heat from the water inside the solar collector tank, so the solar collector tank is a thermal store.8. Easy plug ... of this system, such as electric heater, assistant tank, controller, magnesium and etc.11.Passed EN12976 performance testing Compact pre-heated Solar Water Heater