... normally under low temperature of minus 37c METAL PLATE SOLAR WATER HEATERSolar heating water heater is made by metal collector, superconducting fluid, ... automatic control system, automatic decompression valve, automatic supply systems and water tanks. Collector consists of collector chips, transparent glass cover, insulating ... *2M2Water tank1*100L1*150L1*200L1*250L1*300L Flat-plate solar water heater