... polyurethane12, thickness of heat insulation layer: 50mm to 60mm13. pressurized system: 0.6MP14, material of support: Aluminum Alloy15, color of ... 5)Temperature difference is higher than preset value, controller system will start the circulation pump and the heat energy can ... reduce the resistance of the roof 6)Whole system can be used for swimming pool heating system7) CE, ISO9001, CCC, EN12975 ...