why does the shower lose pressure when you set the water to a warmer temperature?
In: Physics
The hot water probably comes from a storage cylinder, usually located only a little way above the height of the shower. The water pressure out of the cylinder is therefore pretty low, meaning a slower flow rate.
The cold water is either supplied by the main inbound pipes at a much higher pressure or from a tank, often placed higher than the hot water tank (as water often flows from the cold water tank down to fill the hot water cylinder). Both of these result in higher pressure cold water so a higher flow. You can test this by turning on hot water and then cold water from a basin tap. It should behave the same as the shower.
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