heater water solar manufacturer from china. Product details: Heat pipe solar water heater1), reliable, and efficient solar glass and double pipe. 2) Easy plug-in installed. 3) outside the box material: color steel plate board. 4) reliable and efficient double-glass solar tubes. 5) Easy plug-in installed. 6) outside the box material: color coated steel powder. 7) Liner Material: 0.4 mm thick, 304 food grade stainless steel plate. 8) Frame material: color steel plate. 9) High insulation to ensure that 50 - 65 mm polyurethane foam insulation pull also.