Water supply equipment plays a crucial role in addressing daily water pressure issues. It is required in many high-rise residential complexes, schools, factories, hotels, inns, and rural areas. The selection of water supply equipment varies according to customer needs, and each manufacturer may have different standards for categorizing such equipment.

I bet many of you are familiar with secondary water supply! The tap water we use in our daily lives is transported to our homes through pipes. Water transported through pipes is usually under pressure; when tap water leaves the waterworks, it's pressurized to 0.38 MPa, which can lift water to a height of 38 meters. Therefore, for floors below that height, theoretically, the water from the waterworks can directly flow into residents' homes through the pipes.

But some terrains vary, and as the distance water travels through pipes increases, the resistance grows, and the height it can reach also correspondingly decreases. Therefore, this 38-meter height line is not parallel to the ground. However, some buildings have floors that are too high, which can lead to insufficient water pressure, preventing further upward supply. That's why many high-rise buildings initiate secondary water supply. From which floor does the secondary water supply for high-rise buildings start?

Utilize the existing water pressure in the municipal water pipes, compensating as needed; the system stops when the tap water meets the required pressure, achieving up to 50% efficiency. For instance, in a residential complex with 6 floors, during peak water usage, the tap water can reach the 4th floor, and during off-peak usage, it can reach the 6th floor. The variable frequency constant pressure water supply equipment boosts pressure to the 5-6th floors during peak usage and enters sleep mode during off-peak. Power outages can restore normal water pressure supply, with low energy consumption and low operational costs, making it economical and saving daily electricity expenses.