... acts as a thermal source4. When water flows into the copper coil, it absorbs heats from water in the water tank ... solution2,Simple structure, easy to assemble and install. 3,Strong wind, snow and hailstone resistant ability 4,Fresh water, as you ... .5mm; stainless steel SUS-1.2mm5, Insulation: polyurethane 50/60mm6, copper coiler: 24m-30m, Φ12mm, thickness 0.8mmKeywordsCompact Pressure solar water ...