How is water pressure provided to the potable water system's tank?

The potable water system on an A320 is typically pressurized using bleed air from the engines. This method is efficient because it utilizes the existing high-pressure air from the engine bleed system to create the necessary pressure for the water system. The use of bleed air ensures a consistent and reliable pressure source that can adequately supply water for both passenger and crew needs during flight.

In contrast, gravity feed would only work effectively in a system positioned at a sufficient elevation, which is not practical for the aircraft design. An electrical pump could be another method for providing water pressure, but it is not the primary system utilized in the A320's design. A manual pump would require physical effort, which is ill-suited for an aircraft's operational efficiency and design protocols. Hence, utilizing bleed air is both effective and advantageous for maintaining water pressure in the potable water system on an A320.