... normally under low temperature of minus 37c METAL PLATE SOLAR WATER HEATERSolar heating water heater is made by metal collector, superconducting fluid, automatic ... container, insulating layer, wall, water tube and exhaust tube. The material of inner container is 304 # stainless steel, high temperature resistant, uneasy ... 2M22*2M2Water tank1*100L1*150L1*200L1*250L1*300L Flat-plate solar water heater