At present, only households with 7 floors or above are charged the secondary pressurization fee. If the building is below 18 floor, try to choose water supply equipment without tower and negative pressure. This equipment occupies a small area, usually does not cause secondary pollution, saves electricity and has low operating cost.
Generally, the floors above 18 need variable frequency and constant pressure water supply, and the floors below 18 use tower-free negative pressure water supply. Constant pressure is mainly used to build the water tank of the water tower, which belongs to the mode of up-and-down water supply, while negative pressure is the mode of water supply directly connected with the tap water pipe network for subordinate lines.
The size of the second pressurized water supply equipment is the living condition of the population. If there are many people and the water consumption is relatively large, it is necessary to choose a larger one. If there are few people, it is enough to choose a smaller one. In addition, according to the height of the building and your own economic conditions, you can choose water supply equipment with appropriate size for installation.