... normally under low temperature of minus 37c METAL PLATE SOLAR WATER HEATERSolar heating water heater is made by metal collector, superconducting fluid, automatic ... glass cover, insulating layer, back shell; Water tank consist of inner container, insulating layer, wall, water tube and exhaust tube. The material of ... *2M21*2M22*2M22*2M2Water tank1*100L1*150L1*200L1*250L1*300L solar hot water heater