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## Main Question or Discussion Point

Hi guys,

I know the difference between these two things but I'm struggling with something that I hope someone could help me with.

What dictates the water pressure needed for a "system" to work? I would imagine that if you've calculated your system to have a pressure drop of 1 bar (for example) does that mean that you need the water to start at the pressure of at least 2 bar in the system so that after the pressure drop the water is still at or above atmospheric pressure?

Thanks,

I know the difference between these two things but I'm struggling with something that I hope someone could help me with.

What dictates the water pressure needed for a "system" to work? I would imagine that if you've calculated your system to have a pressure drop of 1 bar (for example) does that mean that you need the water to start at the pressure of at least 2 bar in the system so that after the pressure drop the water is still at or above atmospheric pressure?

Thanks,