What is the function of a booster pump in cold water systems, and when is it typically used?

• A. A device that increases downstream pressure to supply upper floors; used in multi-story buildings to balance pressure.
• B. A device that cools water; used in summer.
• C. A filter to remove sediments; used on the main supply.
• D. A valve to shut off flow to the storage tank.

Answer: (A)

A booster pump adds energy to the water to raise the pressure downstream, which is essential when the supply pressure from the main is not high enough to deliver good pressure to upper levels. In cold water systems, water has to push uphill and travel through long runs of pipe, losing pressure along the way. The booster pump compensates for that loss by pushing water with higher pressure so fixtures on higher floors still get a strong flow and consistent pressure. It’s typically used in multi-story buildings or in locations where the incoming supply is low, ensuring all taps and showers, including those on upper levels, receive adequate water pressure. This function is different from cooling, filtration, or shut-off devices, which serve different purposes in the system.