How much does a meter of water pipe cost for an ordinary solar water heater (with insulating layer)

There is a big difference here. For climatic reasons, it is impossible to use the same pipe connections and insulation in the south and the north. Those in the south are very cheap. The cheapest ones for water pipes and insulation cost only 5 yuan, while the most expensive ones cost more than 10 yuan. The cheapest ones in the north cost 30 yuan per meter, and the most expensive ones cost more than 90 yuan per meter. There are many types of water supply pipes, and each type is divided into several grades, with huge differences in price. People who don't understand are easily deceived when they encounter unscrupulous businessmen.