Why does water pressure in the showers changes when temperature changes?
In: Engineering
The water pressure is being generated either by the city water pumps or your home well pump. But the pressure felt at the outlet of the pump is not what is felt at the faucet; with every inch of pipe it flows through, every pipe bend, etc., it reduces somewhat. This is sometimes referred to as “pressure drop” or “head loss”. The cold water in your home flows directly from the well pump or city supply connection at your house. The hot water, on the other hand, flows first through your water heater; this incurs greater head loss, since it’s a longer and more tortuous flowpath. So your hot water at the tap has a somewhat lower pressure. Consequently, when you adjust temperature, you also adjust pressure.
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