... absorb heat energy to heat the water in storage tank2.Copper coil is installed in the water tank as the heat ... acts as a thermal source4. When water flows into the copper coil, it absorbs heats from water in the water tank ... .5mm; stainless steel SUS-1.2mm5, Insulation: polyurethane 50/60mm6, copper coiler: 24m-30m, Φ12mm, thickness 0.8mmKeywordsCompact Pressure solar water ...