What is the primary function of a pressure tank in a plumbing system?

The primary function of a pressure tank in a plumbing system is to maintain water pressure. Pressure tanks are used in systems where water is supplied from a well or a similar source. They work by storing a certain amount of water under pressure, which ensures that when water is drawn from the system, the water pressure remains consistent. This functionality is particularly important in situations where the demand for water fluctuates, as the pressure tank can provide immediate water supply without the need to activate the pump each time water is used. This not only helps to stabilize the system pressure but also prolongs the lifespan of the pump by reducing its operational cycles.

In contrast, storing chemicals for filtration is typically handled by separate components like chemical feeders or storage tanks. Warming the water is a function reserved for water heaters, not pressure tanks. Regulating flow rates is usually managed by valves and flow meters within the plumbing system, not by pressure tanks. Thus, the key role of a pressure tank in maintaining water pressure makes it an essential component in plumbing systems relying on pumps.