What is the minimum size of a regular pressure tank typically used in residential plumbing?

In residential plumbing, the minimum size of a regular pressure tank is often around 42 gallons. This size ensures that there is sufficient water storage and pressure maintenance for typical household demands. Pressure tanks are essential in well systems or homes that require consistent water pressure because they store water under pressure, allowing for a steady supply even when the pump is not actively running.

Using a tank of 42 gallons or larger can help prevent short cycling of the pump, which occurs when the pump turns on and off too frequently. This is not only inefficient but can also lead to premature wear and tear on the pumping system. Therefore, a 42-gallon tank strikes a balance between providing adequate water storage, reducing wear on the pump, and meeting typical household water usage needs.