Not the most reasonable, only more reasonable. Solar hot water projects in the pipeline design to design according to the actual terrain. 1, according to the size of the tonnage, can also be said to determine the thickness of the pipe of the main loop in accordance with the collector area and the collector series and parallel grouping. 2, according to the Sheung Shui and how water runoff to determine the thickness of the water pipes, and to determine whether the installation of Sheung Shui booster pump. 3, according to the size of water and determine the thickness of the water mains, the thickness of the microcirculation return pipe the booster pump Yang Cheng (micro-circulation pipe fine on the charge of water supply). 4, based on the location of the water tank and the collector determine the direction of the solar collector loop system piping. 5, according to the location of the tank with water to determine the direction of the water circulation system piping. In short, the design of a set of solar water heating projects in the pipeline in does not affect the system collection efficiency as much as possible to shorten the pipeline, reduce unnecessary corners. Hot water circulation pipe below the collector, but should be prepared to exhaust. Fried tube collector system should be installed out of the question. A collector group exhaust, a circulating pump outlet check valve leakage, stop, rewind tank water temperature cycle collector group, causing the collector air drying cycling conditions reached a circulation pump start water tank to empty after-sun high temperature collectors group caused the bombing.