Systems divided into zones are used to gain optimum user comfort in water supply- and water distribution applications. These are typically found in high-rise buildings and hilly landscapes.
Splitting the water supply system into zones is necessary to ensure that
- Water pressure does not vary excessively from one floor to another
- The minimum pressure on the upper floor in each zone does not fall below 1.5 - 2 bar
- The maximum pressure on the lowest floor in each zone does not exceed 4 - 4.5 bar
System layout can be with:
- All booster systems placed in the basement. Boosting takes place up in the building (see illustration).
- Cascade booster system layout. One booster in the basement supplies all the water up to zone 1, where a second booster will boost up to zone 2, etc.
- In combination with a roof tank. A booster on the roof top increases pressure for the 3-4 uppermost floors. The rest of the building is served by gravity.