Product Description: heat pipe solar water heater 1) reliable and efficient double-glass solar tubes 2) Easy plug-in installation 3) outside the box Material: stainless steel 4) reliable and efficient double-glass solar tubes 5) Easy plug-in installation 6) Carton Material: stainless steel # 304/2B 7) Liner Material: 0.4 mm thick 304 grade stainless steel plate of food 8) Frame material: stainless steel # 304/2B (1.2 mm thick) 9) High insulation to ensure that 50 - 65 mm polyurethane foam insulation also pull |