When I have a shower, I leave the hot water on to heat up and I can hear the drop in pressure when it’s done. I also notice this when using the kitchen sink and the water seems to become less oxygenated(?) Always wondered why, if the water heats up in the pipe shouldn’t it expand and the water pressure rise?
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Do you mean water flow? Usually rubber in taps expands when it heats so the flow decreases.
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