I don’t know the specific meaning of your question. Do you want to say that there are PERT and PPR in a system? Generally, domestic hot and cold water pipes are made of PPR materials. If this is the case, there must be no problem. The main floor heating pipe is made of PPR material, and the floor heating pipe is made of PERT. What does it mean to use it directly? Use PERT as a domestic water pipe? That is too wasteful. PERT material is more expensive than PPR. In addition, PERT plastic pipes are currently only rated at 20, and water pipes are generally rated at 25 and 32. So I can help you answer your question by asking it more clearly.