The common outside diameter specifications of PPR tube are: 20, 25, 32mm and so on, S3.2 and S2.5 hot water pipe is the domestic hot tub. PPR Tube has hot and cold water points, cold water pipe can not do hot water pipe, then how can we distinguish between hot and cold water pipe? PPR Hot and cold water pipe difference mainly in the tolerance pressure, cold water pipe tolerance pressure is 1.25 or 1.6 MPa, hot water pipe tolerance pressure is 2.0 or 2.5 MPa. Cold water pipe and hot water pipe tolerance pressure is different, wall thickness, price is also different, hot water pipe than cold pipe wall thickness, the price is expensive.
Hot water pipe logo has red line, if the same specifications of PPR pipe wall thickness can distinguish between hot and cold water pipe. Many of them now use hot water pipes.