Yes, water pressure is naturally lower on upper floors and multi-story homes due to the physics of gravity. For every foot of vertical elevation water travels upward against gravity, you lose approximately 0.433 psi of water pressure. This means a second-story bathroom will naturally have about 10 to 15 psi less water pressure than a ground-floor kitchen supplied by the exact same incoming main line, unless a booster pump is installed. Verification: Measure pressure at ground-floor taps versus upstairs showers to calculate the exact elevation pressure drop.
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